CN103454643A - Method for accurately measuring constant sound pressure FSK ultrasonic wave transition time - Google Patents
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Abstract
The invention discloses a method for accurately measuring constant sound pressure FSK ultrasonic wave transition time. Measuring errors brought by the mechanical inertia and the damping effect of an ultrasonic vibrator are effectively reduced (the mechanical inertia and the damping effect are stabilized on fixed values), and accuracy of ultrasonic ranging can be effectively improved. Experiments indicate that by the adoption of the method, the measuring errors are stabilized on the 0.1mm magnitude order, and the technological level of the method is much better than the technological level which technologies of the same kind can reach.
Description
Technical field
The present invention relates to a kind of ultrasonic time of flight accurate measurement method, specifically a kind of constant sound-pressure FSK ultrasonic time of flight accurate measurement method.
Background technology
People's ear is the highest can only feel the sound wave of about 20kHz, frequency more than 20kHz sound wave be exactly ultrasound wave, ultrasound wave belongs to the category of mechanical wave.
Ultrasound wave is followed the propagation law of common mechanical ripple in elastic medium, as reflection and refraction effect can occur the interphase place at medium, after entering medium, by Absorption of Medium, is decayed.Hyperacoustic frequency can be very high, reaches the megahertz level, and therefore, ultrasound wave energy when Propagation can concentrate in very little scope, has good bunchy, good directionality.
Theoretical research shows, in the situation that amplitude is identical, the energy of an object vibration is directly proportional with the quadratic power of vibration frequency.Ultrasound wave is when Propagation, and the frequency of medium particle vibration can be very high, thereby energy is very large.
Utilize large these characteristics of ultrasonic energy, can produce such as mechanical effect, cavitation, thermal effect and chemical effect medium, can carry out ultra-sonic welded, boring, solid pulverizing, emulsification, atomization, degassed, dedusting, remove bird nest, cleaning, sterilizing, promotion chemical reaction and carry out biological study etc., in each departments such as industry and mining, agricultural, medical treatment, be applied widely.
Hyperacoustic another distinguishing feature is along rectilinear propagation, can directional transmissions.The velocity of propagation substantially constant of ultrasound wave in same medium, therefore utilize measure ultrasound wave in this medium through a segment distance time used, can realize contactless range finding.For different media, the speed difference of ultrasonic propagation, utilize this characteristic, also can measure the characteristic of medium, as measured the concentration of alcohol, measures temperature of boiler Air etc.If measured the Ultrasonic Wave Propagation Character of different medium, can measure the type of different material, as quality characteristic of sucrose solution, alcoholic solution, various drinks etc.
In order to measure the slight change (difference) of different medium for ultrasonic velocity, must accurately measure ultrasound wave institute's elapsed time (transit time) in medium, the accurate measurement of transit time has determined the accuracy of identification dielectric attribute.
If fishing boat is loaded with the underwater ultrasound wave producer, it is rotating to all directions emission ultrasound wave, ultrasound wave runs into the shoal of fish and can reflect, fishing boat detects reflection wave and has just known the position of the shoal of fish, this instrument is called sonar, sonar also can be used for surveying the submerged reef in water, enemy's submarine, measures the degree of depth of seawater.Also can use ultrasonic listening metal, ceramic concrete goods according to same reason, even reservoir dam, check whether inside has bubble, cavity and crackle, realizes lossless detection.The surface of each internal organ of human body is different to hyperacoustic reflection potential, and the reflection potential of healthy internal organ and pathology internal organ is also different.Usually " B ultrasonic " said is exactly to carry out radiography according to the ultrasound wave of visceral reflex, helps the doctor to analyze the pathology in body.
Along with the development of sensor and single-chip microcomputer control technology, the non-contact detection technology has been widely used in a plurality of fields.At present, typical contactless distance-finding method has ultrasonic ranging, CCD detection, radar range finding, laser ranging etc.Wherein, CCD survey have easy to use, without signal emitting-source, obtain a large amount of characteristics such as scene information simultaneously, but the CCD range finding needs extra computing cost.Radar range finding has all weather operations, is suitable for carrying out in rugged environment the advantage of short distance, precision distance measurement, but easily is subject to Electromagnetic Interference.Laser ranging has the advantages such as high directivity, high monochromaticity, high brightness, measuring speed be fast, especially misty rain is had to certain penetration capacity, and antijamming capability is strong, but its cost is high, data processing complex.
With front several distance measuring methods, compare, ultrasonic ranging can directly be measured close-in target, and longitudinal frame is high, applied widely, high directivity, and possess factors such as not being subject to light, smog, electromagnetic interference (EMI) and affect, and the advantage such as coverage rate is larger.At present, ultrasonic ranging generally is applied in level gauging, localization for Mobile Robot and keeps away the fields such as barrier, has a extensive future.
Medically, if the measuring accuracy of B ultrasound echo time is improved to an order of magnitude, can greatly improve the sharpness of B ultrasonic image, reduce doctor's probability of miscarriage of justice.
Ultrasonic measurement obviously shows following trend in recent years:
1, the position, size, shape, the character that by qualitatively judging having or not of defect, develop into defect quantitatively judge, and utilize two dimension, the 3-D view of the direct display defect of various imaging techniques;
2, to the intelligent development of online automatic detection and instrument, the non-contact ultrasonic measuring technology progress that makes a breakthrough wherein:
3, the evaluation of physical property of ultrasonic measurement and material combines, and the design of material, processing and engineering application develop rapidly.
As shown in Figure 1, the ultimate principle of ultrasonic ranging, ultrasonic sensor sends ultrasound wave by the pulse signal excitation, by sound bearing medium, passes to testee, forms reflection wave; Reflection wave turns back to receiving sensor by sound bearing medium again, and sensor converts acoustical signal to electric signal, goes out ultrasound wave by systematic survey and receives institute's elapsed time (transit time) from being transmitted into, and utilizes formula:
just can obtain the distance between ultrasonic sensor and testee.
Wherein:
hyperacoustic transmission speed,
, unit is
,
it is environment temperature;
be that ultrasound wave receives institute's elapsed time from being transmitted into, unit is second.
Because the scope of ultrasonic ranging and precision are subject to the impact of many factors (as the performance of ultrasonic transmitter and receptacle itself, signal power, signal to noise ratio (S/N ratio), environment temperature, humidity, timer accuracy of timekeeping etc.), measuring accuracy and scope all are limited by very large.After pumping signal acts on transmitter, the ultrasound wave that transmitter sends can present the process of an amplification, until amplitude stabilization; After pumping signal finishes, ultrasonic transmitter has remained shock; And receiver is under hyperacoustic excitation, the electric signal of its output also has the process of an amplification, and when emissive power is less or measuring distance when far away, receiver is likely experienced the incentive action less than first transmitted wave.Fig. 2 has meaned the process of this amplification.After the decay of communication process, due to
amplitude of ultrasonic constantly seldom,
ultrasonic echo constantly not necessarily can be detected.In other words, first echo frontier that receiver detects might not be
hyperacoustic forward position of constantly launching, and may be
constantly, or even
the ultrasound wave forward position of constantly launching.But,
constantly to ultrasonic transmitter, add pumping signal, timer has but started timing, and this will bring imponderable error for measurement.In the situation that the ultrasonic transmitter emissive power is identical, tested distance is far away, and the amplitude of ultrasonic reflected through measured target is just less.Just can not be detected or be not easy to be detected after to a certain extent when the amplitude of ultrasonic reflected is little, thereby measurement range is restricted.Due to the restriction of ultrasonic transmitter emissive power, the Validity Test distance is generally shorter.From measuring accuracy, on the one hand, the count frequency of the whether accurate sum counter that hyperacoustic echo frontier detects will directly have influence on the precision of measurement.If select ultrasonic transmitter and receiver that resonance frequency is 40kHz, echo frontier detects and to differ the measuring error that a pulse brings is 8.5 mm (hyperacoustic velocity of wave press 340m/s calculating), for the measurement of mm class precision, its error is very important.On the other hand, the measured value of transit time often differs 1 μ s and also will bring the range error of 0.34mm.
By hyperacoustic transmission speed
known, environment temperature is about 0.6m/ ℃ for hyperacoustic velocity of propagation, by measures ambient temperature can compensation temperature for the impact of ultrasonic propagation velocity, but in the measuring error of environment temperature and travel path, environment temperature is inconsistent, will cause technique for temperature compensation not reach the compensation purpose of expection.Therefore the mark post mensuration arises at the historic moment.
The mark post mensuration is that flag-rod is set before ultrasonic transmitter, due to the distance between known markers bar and transmitter
, therefore only need to measure ultrasound wave through the transit time between flag-rod and transmitter
, according to
, can obtain the acoustic velocity value under the actual measurement environment.The mark post mensuration does not need to consider the impact of environment temperature for the velocity of sound, has avoided the second order error of bringing because of the temperature compensation velocity of sound.But the mark post mensuration can't solve the problem that echo frontier accurately detects.
CN03207478.6 described " supersonic range finder with sensitivity automatic gain control function " discloses by a digital regulation resistance and has automatically adjusted the enlargement ratio that receives signal, thereby make in the process of whole range finding, signal processing circuit can obtain the echoed signal of more stable equilibrium.This device includes microprocessor, ultrasonic transmit circuit, ultrasound wave receiving circuit, echoed signal amplifying circuit, echoed signal detecting circuit and display circuit.This supersonic range finder also includes digital regulation resistance, this digital regulation resistance is connected with the operational amplifier of echoed signal amplifying circuit with microprocessor, microprocessor control figure potentiometer, make this digital regulation resistance automatically change the enlargement ratio that its resistance value is adjusted echoed signal, make whole range finding from process in obtain more balanced echoed signal, and do not affect closely find range from effectively shielded the generation of the mistake display signals such as geodetic, can increase substantially the enlargement ratio of echoed signal during due to telemeasurement, so effectively improved remote range finding effect.
But, according to ultrasound wave in communication process, the attenuation law of its acoustic pressure and the sound intensity:
Wherein:
,
: apart from sound source
xthe acoustic pressure of distance and the sound intensity
x: the distance between measurement point and sound source
Explanation, increase along with propagation distance, the acoustic pressure at acceptance point place and the sound intensity are the index law decay and reduce rapidly, when in telemeasurement the time, hyperacoustic energy will constantly be depleted in transmitting procedure, the signal of receiving end will be submerged among the noise of medium and can't identification, now how regulate enlargement ratio also of no avail again.This patent can't solve echo frontier and measure inaccurate problem simultaneously.
CN200710071684.4 described " ultrasonic echo frontier inspection based on modulation domain measurement " has told about by two kinds of ultrasonic frequencies of emission
,
, the transit time computation and measurement distance by the survey frequency switching point from the transmitting terminal to the receiving end, measure inaccurate problem thereby overcome echo frontier in the conventional ultrasonic wave distance-finding method.
As shown in Figure 3,
be hyperacoustic frequency hopping point of emission constantly,
constantly, the ultrasonic cycle of emission is
, frequency is
; ?
constantly, the ultrasound wave cycle of emission is
, frequency is
.Simultaneously, timer from
constantly start timing.
be constantly
the ultrasound wave of emission arrives the moment of ultrasonic receiver, the i.e. moment of echo frequency saltus step through medium transmission constantly.
with
difference be the transit time of ultrasound wave in medium.
When hyperacoustic frequency
with
differ larger, in measuring process, the detection of frequency conversion point is just easier.In fact, due to the restriction of ultrasonic transmitter and receiver bandwidth,
with
very approaching, for the detection of frequency conversion point has brought certain difficulty.
CN200710071684.4 described " ultrasonic echo frontier inspection based on modulation domain measurement " has ignored the key property of a relevant ultrasonic transmitter and receiver in when design, no matter be transmitter or receiver, its principle of work is all piezoelectric effects, transmitter converts electric signal to mechanical wave, receiver is converted to electric signal by mechanical wave, and mechanical vibration exist machinery inertial and damping effect, when oscillator is transformed into another vibration frequency from a vibration frequency, the process of its frequency switching can not be instantaneous, the exciting power difference, the time of its switching is inevitable different.On the basis of this sense, CN200710071684.4 described " ultrasonic echo frontier inspection based on modulation domain measurement " is no longer valid, in other words no longer as described in it so remarkable of effect.
Theory shows, mechanical vibration are from a vibration frequency
be transformed into another vibration frequency
the time, its initial frequency change will be chaos and unordered, thereafter just slowly to
draw close, finally be stabilized in
upper, the time that whole handoff procedure is required, for transmitter, relevant to driving voltage, for receiver, with the acoustic pressure harmony strong correlation of acceptance point.
Experiment shows, works as use
electric signal stimulated emission device the time, general 4 oscillation period of its switching time.
Summary of the invention
In order to solve the above-mentioned technical matters existed in prior art, the invention provides a kind of constant sound-pressure FSK ultrasonic time of flight accurate measurement method, comprise the steps:
(1) the carrier pulse generator produces the pulse signal of two kinds of frequencies
,
, when the logic level of frequency conversion marker pulses changes, the frequency of carrier pulse generator output will change, and when the frequency conversion marker pulses is logical one, the frequency of carrier pulse generator output pulse signal is
, when the frequency conversion marker pulses is logical zero, the frequency of carrier pulse generator output pulse signal is
programmable pulse amplifier I is sent on pulse signal one tunnel of carrier pulse generator output, and pulse signals is carried out the homophase amplification, sends into programmable pulse amplifier II after another road paraphase, pulse signals is carried out anti-phase amplification, this two-way differential power signal driver transmitter output ultrasonic wave;
(2) ultrasonic receiver is converted to electric signal by ultrasound wave, after amplifying circuit amplifies, is divided into two-way, and road output pulse signal after the zero passage trigger supplies the hyperacoustic frequency of counter measures, for detection of the frequency conversion point; Another road becomes the signal intensity received into DC voltage through accurate detecting circuit, and double-limit comparator is screened the size of this DC voltage, when signal intensity is greater than on the received signal level of setting in limited time, and the output pin up_H=1 of comparer, down_L=1; When signal intensity is less than under the received signal level of setting in limited time, the output pin up_H=0 of comparer, down_L=0; When signal intensity is between the received signal level upper and lower limit of setting, the output pin up_H=0 of comparer, down_L=1; The duty of up-down counter is subject to the control of up_H, down_L logic level: when up_H=1, down_L=1, up-down counter is done and is subtracted counting; When up_H=0, down_L=0, up-down counter is done and is added counting; When up_H=0, down_L=1, up-down counter maintains original state;
(3) enlargement factor of described programmable pulse amplifier is proportional to the count value of up-down counter, the signal level received when ultrasonic receiver hour, up-down counter will be done and add counting operation, the output signal of programmable pulse amplifier will increase, the signal level that ultrasonic receiver receives also and then increases, as this level (up_H=1 during greatly to the boundary level that surpasses setting, down_L=1), up-down counter is done and is subtracted counting, incoming level reduces, up_H=0 now, down_L=1, up-down counter stops counting, received signal level just is stabilized on this level point,
If now measuring distance increases, the signal level that ultrasonic receiver receives and then reduces, (up_H=0 when this level is less than the lower level of setting, down_L=0), up-down counter is done and is added counting, and incoming level increases, up_H=0 now, down_L=1, up-down counter stops counting, and received signal level is stabilized in again on this level point;
(4), when the logic level of Single-chip Controlling frequency conversion marker pulses periodically changes, the frequency of carrier pulse generator output also can periodically exist
with
between change back and forth, when the logic level change of frequency conversion marker pulses, with regard to metering circuit start-up time, in order to measure the cycle of the pulse signal end output pulse signal received, judge the frequency conversion point of this signal, the time between the pulse signal end output pulse signal frequency conversion point of the logic level change of frequency conversion marker pulses and reception is exactly hyperacoustic transit time.
Further, the count value of described up-down counter is larger, and the amplitude of programmable pulse amplifier output pulse signal is also larger.
Further, when circuit works, the signal level that ultrasonic receiver receives is always between the upper and lower limit of setting level, if set very close that the upper and lower limit of level arranges, the signal level that ultrasonic receiver receives is constant.
Constant sound-pressure FSK ultrasonic time of flight accurate measurement method of the present invention has overcome the measuring error (machinery inertial and damping effect are stabilized on a fixing value) that ultrasonic oscillator machinery inertial and damping effect are brought effectively.Can effectively improve the precision of ultrasonic ranging, experiment shows, adopts the method measuring error to be stabilized on the order of magnitude of 0.1mm.Be far superior to the technical merit that similar technology can reach.
The accompanying drawing explanation
Fig. 1 is the ultrasonic ranging schematic diagram;
Fig. 2 is actual transmitted wave and the echo corresponding relation figure at time shaft;
Fig. 3 is transmitted wave after FSK modulation and the waveform schematic diagram of echo;
Fig. 4 is that constant sound-pressure FSK ultrasound wave is paced more time accurate measurement method theory diagram.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 4, constant sound-pressure FSK ultrasonic time of flight accurate measurement method comprises following performing step:
The carrier pulse generator produces the pulse signal of two kinds of frequencies
,
, when the logic level of frequency conversion marker pulses changes, the frequency of carrier pulse generator output will change, and when the frequency conversion marker pulses is logical one, the frequency of carrier pulse generator output pulse signal is
, when the frequency conversion marker pulses is logical zero, the frequency of carrier pulse generator output pulse signal is
.Programmable pulse amplifier I is sent on pulse signal one tunnel of carrier pulse generator output, pulse signals is carried out the homophase amplification, send into programmable pulse amplifier II after another road paraphase, pulse signals is carried out anti-phase amplification, this two-way differential power signal driver transmitter output ultrasonic wave.
Ultrasonic receiver is converted to electric signal by ultrasound wave, after amplifying circuit amplifies, is divided into two-way, and road output pulse signal after the zero passage trigger supplies the hyperacoustic frequency of counter measures, for detection of the frequency conversion point; Another road becomes the signal intensity received into DC voltage through accurate detecting circuit, and double-limit comparator is screened the size of this DC voltage, when signal intensity is greater than on the received signal level of setting in limited time, and the output pin up_H=1 of comparer, down_L=1; When signal intensity is less than under the received signal level of setting in limited time, the output pin up_H=0 of comparer, down_L=0; When signal intensity is between the received signal level upper and lower limit of setting, the output pin up_H=0 of comparer, down_L=1.
The duty of up-down counter is subject to the control of up_H, down_L logic level.When up_H=1, down_L=1, up-down counter is done and is subtracted counting; When up_H=0, down_L=0, up-down counter is done and is added counting; When up_H=0, down_L=1, up-down counter maintains original state.
The enlargement factor of programmable pulse amplifier is proportional to the count value of up-down counter, that is to say, the count value of up-down counter is larger, and the amplitude of programmable pulse amplifier output pulse signal is also larger.Therefore, the signal level received when ultrasonic receiver hour, up-down counter will be done and add counting operation, the output signal of programmable pulse amplifier will increase, the signal level that ultrasonic receiver receives also and then increases, as this level (up_H=1 during greatly to the boundary level that surpasses setting, down_L=1), up-down counter is done and is subtracted counting, incoming level reduces, up_H=0 now, down_L=1, up-down counter stops counting, and received signal level just is stabilized on this level point.
If now measuring distance increases, the signal level that ultrasonic receiver receives and then reduces, (up_H=0 when this level is less than the lower level of setting, down_L=0), up-down counter is done and is added counting, and incoming level increases, up_H=0 now, down_L=1, up-down counter stops counting, and received signal level is stabilized in again on this level point.
As can be seen here, when circuit works, the signal level that ultrasonic receiver receives is always between the upper and lower limit of setting level, if we will set very close that the upper and lower limit of level arranges, the signal level that ultrasonic receiver receives will be constant.
When the logic level of Single-chip Controlling frequency conversion marker pulses periodically changes, the frequency of carrier pulse generator output also can periodically exist
with
between change back and forth.When the logic level change of frequency conversion marker pulses, with regard to metering circuit start-up time, in order to measure the cycle of the pulse signal end output pulse signal received, judge the frequency conversion point of this signal, the time between the pulse signal end output pulse signal frequency conversion point of the logic level change of frequency conversion marker pulses and reception is exactly hyperacoustic transit time.The delay that the machinery inertial that this time comprises transmitter and receiver and damping effect produce, because the ultrasound wave acoustic pressure harmony of the signal level that is loaded into transmitter and acceptance point all keeps by force constant, so be fixed value this time delay, can be eliminated by the method for calibration.
Claims (3)
1. a constant sound-pressure FSK ultrasonic time of flight accurate measurement method, comprise the steps:
(1) the carrier pulse generator produces the pulse signal of two kinds of frequencies
,
, when the logic level of frequency conversion marker pulses changes, the frequency of carrier pulse generator output will change, and when the frequency conversion marker pulses is logical one, the frequency of carrier pulse generator output pulse signal is
, when the frequency conversion marker pulses is logical zero, the frequency of carrier pulse generator output pulse signal is
programmable pulse amplifier I is sent on pulse signal one tunnel of carrier pulse generator output, and pulse signals is carried out the homophase amplification, sends into programmable pulse amplifier II after another road paraphase, pulse signals is carried out anti-phase amplification, this two-way differential power signal driver transmitter output ultrasonic wave;
(2) ultrasonic receiver is changed to electric signal by the ultrasound wave wheel, after amplifying circuit amplifies, is divided into two-way, and road output pulse signal after the zero passage trigger supplies the hyperacoustic frequency of counter measures, for detection of the frequency conversion point; Another road becomes the signal intensity received into DC voltage through accurate detecting circuit, and double-limit comparator is screened the size of this DC voltage, when signal intensity is greater than on the received signal level of setting in limited time, and the output pin up_H=1 of comparer, down_L=1; When signal intensity is less than under the received signal level of setting in limited time, the output pin up_H=0 of comparer, down_L=0; When signal intensity is between the received signal level upper and lower limit of setting, the output pin up_H=0 of comparer, down_L=1; The duty of up-down counter is subject to the control of up_H, down_L logic level: when up_H=1, down_L=1, up-down counter is done and is subtracted counting; When up_H=0, down_L=0, up-down counter is done and is added counting; When up_H=0, down_L=1, up-down counter maintains original state;
(3) enlargement factor of described programmable pulse amplifier is proportional to the count value of up-down counter, the signal level received when ultrasonic receiver hour, up-down counter will be done and add counting operation, the output signal of programmable pulse amplifier will increase, the signal level that ultrasonic receiver receives also and then increases, as this level (up_H=1 during greatly to the boundary level that surpasses setting, down_L=1), up-down counter is done and is subtracted counting, incoming level reduces, up_H=0 now, down_L=1, up-down counter stops counting, received signal level just is stabilized on this level point,
If now measuring distance increases, the signal level that ultrasonic receiver receives and then reduces, (up_H=0 when this level is less than the lower level of setting, down_L=0), up-down counter is done and is added counting, and incoming level increases, up_H=0 now, down_L=1, up-down counter stops counting, and received signal level is stabilized in again on this level point;
(4), when the logic level of Single-chip Controlling frequency conversion marker pulses periodically changes, the frequency of carrier pulse generator output also can periodically exist
with
between change back and forth, when the logic level change of frequency conversion marker pulses, with regard to metering circuit start-up time, in order to measure the cycle of the pulse signal end output pulse signal received, judge the frequency conversion point of this signal, the time between the pulse signal end output pulse signal frequency conversion point of the logic level change of frequency conversion marker pulses and reception is exactly hyperacoustic transit time.
2. constant sound-pressure FSK ultrasonic time of flight accurate measurement method as claimed in claim 1, it is characterized in that: the count value of described up-down counter is larger, and the amplitude of programmable pulse amplifier output pulse signal is also larger.
3. constant sound-pressure FSK ultrasonic time of flight accurate measurement method as claimed in claim 1, it is characterized in that: when circuit works, the signal level that ultrasonic receiver receives is always between the upper and lower limit of setting level, if set very close that the upper and lower limit of level arranges, the signal level that ultrasonic receiver receives is constant.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105911308A (en) * | 2016-06-13 | 2016-08-31 | 中科同德（厦门）物联网科技有限公司 | Wind speed and wind direction measurement method |
| CN107576964A (en) * | 2017-08-25 | 2018-01-12 | 西安理工大学 | The echo time measuring method of linear frequency variation signal |
| TWI646341B (en) * | 2017-10-18 | 2019-01-01 | 宏碁股份有限公司 | Distance detection device and distance detection method thereof |
| CN113671215A (en) * | 2021-07-30 | 2021-11-19 | 苏州斯威高科信息技术有限公司 | Measurement and calibration method and system for improving precision of ultrasonic wind sensor |
| CN114527454A (en) * | 2022-02-10 | 2022-05-24 | 德闻仪器仪表(上海)有限公司 | Adjusting system and adjusting method for adaptive amplification of ultrasonic signals |
| CN115077639A (en) * | 2022-08-22 | 2022-09-20 | 水发航宇星物联科技(辽宁)有限公司 | Measuring method for ultrasonic flowmeter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105911308A (en) * | 2016-06-13 | 2016-08-31 | 中科同德（厦门）物联网科技有限公司 | Wind speed and wind direction measurement method |
| CN107576964A (en) * | 2017-08-25 | 2018-01-12 | 西安理工大学 | The echo time measuring method of linear frequency variation signal |
| TWI646341B (en) * | 2017-10-18 | 2019-01-01 | 宏碁股份有限公司 | Distance detection device and distance detection method thereof |
| CN113671215A (en) * | 2021-07-30 | 2021-11-19 | 苏州斯威高科信息技术有限公司 | Measurement and calibration method and system for improving precision of ultrasonic wind sensor |
| CN113671215B (en) * | 2021-07-30 | 2024-02-20 | 苏州斯威高科信息技术有限公司 | Measurement and calibration method and system for improving accuracy of ultrasonic wind sensor |
| CN114527454A (en) * | 2022-02-10 | 2022-05-24 | 德闻仪器仪表(上海)有限公司 | Adjusting system and adjusting method for adaptive amplification of ultrasonic signals |
| CN115077639A (en) * | 2022-08-22 | 2022-09-20 | 水发航宇星物联科技(辽宁)有限公司 | Measuring method for ultrasonic flowmeter |
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|---|---|
| CN103454643B (en) | 2015-05-27 |
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