DE102011011179A1 - Hand Held Metal Detector - Google Patents

Abstract

A handheld metal detector (12) includes a metal detector (20) for detecting metals, and a sampling device (24) for receiving particles (26) for particle analysis (16).

Description

The invention relates to a handheld metal detector with a metal detection device for detecting metals. Such handheld metal detectors are used, for example, to search people at airports to find out if the person being examined carries metal objects such as weapons.

To detect hazardous substances such as explosives or drugs, persons at airports, for example, have only been randomly checked to see whether they carry such explosives and / or hazardous substances or drugs. For this purpose, in general, for example, detection dogs are used, or there are particulate suckers are used, with which the person is sucked, or samples are taken by wiping the person. The samples thus collected are then examined for the presence of explosive particles, hazardous particles and / or drug particles.

On the one hand, the methods used hitherto have a very low effectiveness, since the individuals can only be examined on a random basis, and they are additionally labor-intensive, since additional personnel are required for the sampling and the analysis. Furthermore, the sampling takes additional time, which is further extended by the fact that the sampling and detection are usually carried out spatially and temporally separated. Furthermore, persons are usually only examined hands, which results in a limited validity of the samples. Furthermore, a separation of z. As other air passengers, the subsequent wiping the hands or suction of the entire body surface is not desired.

The use of detection dogs has the disadvantage that dogs are only used for a short time, so that a check is only possible by random sampling or suspicion. Further, the use of tracking dogs is expensive, as a lengthy training of the dogs is necessary and also additional staff is needed to look after the dogs. Furthermore, a control of persons by tracking dogs is not necessarily desired.

The object of the invention is to provide an apparatus and a method for controlling persons or objects for dangerous goods or objects, which is less expensive and less expensive than the previously common methods.

The object is achieved with a handheld metal detector with the features of claim 1.

A control method for controlling whether persons or objects carry dangerous goods or objects is the subject matter of the independent claim.

Advantageous embodiments of the invention are the subject of the dependent claims.

A hand-held metal detector comprises a metal detecting device for detecting metals and a sampling device for receiving particles for particle analysis, in particular of hazardous and / or explosive particles.

With such a trained hand metal detector, it is possible to detect whether a person or an object carries metallic hazardous goods such as weapons with it. At the same time particles of, for example, hazardous substances, explosives or drugs can be taken up during the scanning of the person over the entire body surface or the object with the handheld metal detector via the sampling device. It is thus possible to detect in one step whether the person or the object carries or contains dangerous goods and thus represents a danger. The labor cost is low as the person performing the inspection for metallic objects also simultaneously samples the hazardous and / or explosive traces. Such an investigation can generally be carried out on all persons passing, for example, a barrier at an airport, so that the control can be carried out effectively and not just randomly. On a use of detection dogs can be dispensed with. Furthermore, it is not necessary to separate the persons or objects to be examined.

A simple detection of the recorded particles can be carried out, for example, by exchanging the sampling device on the hand-held metal detector after every inspection of a person or of an object and, for example, inserting it into a base station, where a detection of the recorded particles can be carried out.

Advantageously, the sampling device has a detachment device for detaching the particles from a surface and a receiving device for receiving the detached particles. Thus, advantageously, in one step by the detachment devices, the particles of, for example, the clothing or the skin of the person to be examined or of the object to be examined be replaced and recorded by the receiving device. Thus, it is possible to transfer the particles to be examined directly into the hand-held metal detector.

The detaching device preferably has an excitation device for the energetic excitation of the particles and / or an electrostatic charge generator. By means of the excitation device or the electrostatic charge generator or a combination of the two, the particles to be examined can preferably be detached from a person or an object in a non-contact and inconspicuous manner. For this purpose, the excitation device particularly preferably has a turbine, an infrared source, in particular a light-emitting diode (LED) or a laser, an ultrasound generator, an ultraviolet source, an infrasound generator and / or a heat source or a combination thereof. With the devices mentioned, it is advantageously possible to supply energy to the particles so as to detach them from the person to be examined or the object to be examined.

For example, the particles may be removed from the surface by generating a negative pressure via a turbine or pump, i. H. the person to be examined or the object to be examined, detached and sucked off. Furthermore, an acoustic excitation by means of an ultrasound and / or infrasound generator is also possible, which causes the particles to vibrate and thus facilitate detachment. The ultrasonic / infrasonic generator can be used continuously or pulsed. Furthermore, it is also possible to detach the particles from the surface to be examined by applying photon energy. For this purpose, for example, an infrared source or an ultraviolet source in the form of lasers or LEDs can be used. Preferably, selective desorption of hazardous and explosive particles is possible when the infrared sources, i. H. Laser or LED, to which wavelengths of the specific absorption bands of the particles are tuned. Also, a heat source, for example, by heat radiation or a heated air flow to the particles supply energy enough to detach it from the surface to be examined. Furthermore, the presence of ions in a stream of air, depending on the application positively or negatively charged, contributes to the fact that the particles to be examined can be more easily removed from the surface to be examined.

Advantageously, the receiving device for receiving the particles to be examined in the hand-held metal detector, a turbine and / or a pump. Thus, the surface to be examined, i. H. preferably detached from the person or the object, detached particles simply into the handheld metal detector. The pump or turbine may be identical in a preferred embodiment with the pump or turbine, which detaches the particles by generating a negative pressure from the surface.

Further advantageously, the receiving device has an enrichment device for enriching the recorded particles. Preferably, an absorption device for absorbing the picked-up particles is provided here, which absorbs depending on the charge direction of the particles and / or depending on their state of aggregation detached from the surface to be examined and sucked into the handheld metal detector particles. The term "state of aggregation" is understood to mean that the particles can be present in a vaporous phase, for example. H. in a homogeneous liquid-gas mixture, or, for example, in a particulate phase, i. H. in a homogeneous solid-gas mixture. The particles thus present can either be absorbed together on the absorption device or they can be separated and detected separately from one another. An enrichment of the recorded particles by, for example, absorption on a surface makes a subsequent detection more effective, since so advantageously a higher concentration of the particles than on the surface to be examined is achieved and even small traces can be detected.

Advantageously, an ionization device for applying charge to the recorded particles is provided in the hand-held metal detector. Thus, it is advantageously possible to separate the particles in the hand-held metal detector according to their charge and to absorb them as a function of the charge at the absorption device.

An analysis device for analyzing particles, in particular hazardous and / or explosive particles, has a hand-metal detector described above and an analysis device for analyzing the particles.

This makes it possible to use the hand-held metal detector in addition to the detection of metallic objects of danger particles of hazardous and / or explosives or drugs to analyze them in the analysis device and quickly find out whether a person represents a danger.

Advantageously, the analysis device to an ion mobility spectrometer and / or a mass spectrometer. With such spectrometers, a chemical analysis of the recorded particles with very low detection limits is advantageously possible.

Particularly preferably, the analysis device is arranged in the hand-held metal detector. For this purpose, an ion mobility spectrometer is preferably used in the hand-held metal detector, since this can be made smaller than a mass spectrometer and therefore rather suitable for use in the hand-held metal detector itself. With such an arrangement, it is possible to very quickly recognize a potential danger to a person or an object, in order then to be able to separate the person or the object for further checking or examination.

• a) Kontrollieren der Person oder des Objektes mit einem Handmetalldetektor;
• b) Ablösen von Partikeln, insbesondere von Gefahr- und/oder Sprengstoffpartikeln, von der Oberfläche mit dem Handmetalldetektor;
• c) Aufnehmen der abgelösten Partikel mit dem Handmetalldetektor; und
• d) Anreichern der aufgenommenen Partikel in dem Handmetalldetektor.

In a control procedure to check whether persons or objects carry dangerous goods or objects, the following steps are carried out:

• a) checking the person or the object with a hand-held metal detector;
• b) detachment of particles, in particular of hazardous and / or explosive particles, from the surface with the hand-held metal detector;
• c) picking up the detached particles with the hand-held metal detector; and
• d) enriching the captured particles in the handheld metal detector.

In this case, the step a1) is preferably carried out in step a) energetic excitation of the particles, wherein the particles in particular energy in the form of kinetic energy, acoustic energy, optical energy and / or heat energy is supplied. Further advantageously, in step a) the particles can be flown for detachment with ions and / or in step b) the step b1) sucking the detached particles are carried out in the enrichment device.

Advantageously, the particles are enriched in an absorption device, wherein the particles are enriched in particular depending on their state of aggregation. Under aggregate state is understood here that the particles in the sucked mixture either vaporously, d. H. in a homogeneous liquid-gas mixture, or particulate, d. H. present in a homogeneous solid-gas mixture.

Further advantageously, step c) comprises the step c1) ionizing the captured particles for applying a charge to the particles in the enrichment device, wherein the charged particles are enriched in particular as a function of their charge direction.

Preferably, after step c), a step d) of analyzing the enriched particles is carried out. In particular, step c) is carried out in the hand-held metal detector and / or step d) comprises the step d1) transfer of the enriched particles from the hand-held metal detector into an analysis device.

Embodiments of the invention will be explained in more detail with reference to the accompanying drawings. It shows:

1 a person being scanned with a hand-held metal detector;

2 the handheld metal detector off 1 with integrated sampling device;

3 the handheld metal detector off 1 and 2 with a first embodiment of an excitation device;

4 the handheld metal detector from the 1 and 2 with a second embodiment of an excitation device;

5 the handheld metal detector from the 1 and 2 with a third embodiment of an excitation device;

6 the handheld metal detector from the 1 and 2 with a fourth embodiment of an excitation device;

7 the handheld metal detector from the 1 and 2 with a fifth embodiment of an excitation device;

8th the handheld metal detector from the 1 with an integrated ionization device;

9 an external analyzer for analyzing the with the hand-held metal detector 2 and 8th absorbed particles;

10 a handheld metal detector with a sampling device and an integrated analysis device and

11 a method for detecting hazardous and / or explosive particles.

In 1 is a person 10 shown using a handheld metal detector 12 is checked, whether they are metallic hazardous items such as weapons 13 or other hazardous substances 14 such as explosives 16 or drugs 18 with you.

This is the person 10 along the arrows shown on both the front and on the back over the entire body surface 19 with the handheld metal detector 12 sampled. By completely scanning the body surface 19 can provide meaningful samples of any existing hazardous substances 14 , Explosives 16 or drugs 18 to be obtained.

2 shows a detailed view of the handheld metal detector 12 out 1 , The handheld metal detector 12 has a metal detection device 20 for detecting metallic hazardous objects and a sampling device 24 for picking up particles 26 from the body surface 19 (in the following only surface 19 ) the person 10 on.

The metal detection device 20 has one for metal detectors 20 with handheld metal detectors 12 usual construction. Such metal detection devices 20 are well known in the art and will not be discussed further here.

The sampling device 24 has a detachment device 30 to detach the particles 26 , as well as a recording device 32 for picking up the particles 26 on.

In the recording device 32 are rotor blades 34 a pump or turbine 36 Arranged by the surface 19 detached particles 26 in the receiving device 32 suck in and to an enrichment facility 38 hand off. In the enrichment facility 38 is an absorber 40 provided at the sucked particles 26 can be absorbed.

In the removal device 30 is an excitation device 42 provided to the particles 26 lighter from the surface 19 to be able to replace.

In the 3 to 7 are different embodiments of excitation devices 42 shown.

In a first embodiment of the excitation device 42 represented in 3 , is a light source 44 provided with the particles 26 Energy in the form of optical energy 46 can be supplied. The light source 44 can be an infrared source 48 or an ultraviolet source 50 be. In the embodiment according to 3 becomes the light source 44 through a laser 52 provided that emits highly focused light. In an alternative second embodiment, shown in FIG 4 becomes the light source 44 through a light emitting diode 54 provided, unlike the laser 52 emits diffused light. Selective desorption of hazardous and explosive particles 14 . 16 can be achieved when the infrared sources 48 ie laser 52 or LED 54 , on the wavelengths of the specific absorption bands of the particles 26 be matched.

In the third embodiment of the excitation device 42 represented in 5 , is a sound generator 56 , which alternatively is an ultrasonic generator 58 or an infrared producer 60 can be provided. By the sound generator 56 emitted sound waves 62 becomes the particle 26 acoustic energy 64 fed, so the particles 26 be vibrated and light off the surface 19 can be sucked off.

In 6 is a fourth embodiment of an excitation device 42 for stimulating the particles 26 shown. Here is a heat source 26 in the form of, for example, a heat radiator 68 provided the surface 28 with heat energy 70 acts and thus the detachment of the particles 26 from the surface 19 facilitated.

In 7 In a fifth embodiment, a hand-held metal detector 12 shown in which the particles 26 with an ionized airflow 72 can be flown. The ionized airflow 72 is doing in an electrostatic charge generator 74 generated. The electrically charged particles 76 that is the ions 77 , can be anions 78 or cations 80 be.

It is also possible to use a combination of said excitation equipment 42 in the handheld metal detector 12 provided. Alternatively, the excitation equipment 42 according to 3 to 7 be omitted, so that the particles to be detached 26 only kinetic energy 82 over the rotor blades 34 is supplied.

In 8th is the handheld metal detector 12 out 2 shown, in addition to the rotor blades 34 in the receiving device 32 an ionization device 84 for ionizing the recorded particles 26 is arranged. By the ionization device 84 can the captured particles 26 Depending on their chemical nature, they can be positively or negatively charged or remain neutral.

The enrichment facility 38 in the 2 and 8th illustrated hand-held metal detector 12 has an interface 86 on, with which they are using the recording device 32 and with an externally located analyzer 88 represented in 9 , is connectable. As in 8th indicated by the dashed line, the handheld metal detector can 12 along the dashed line to be opened, so the enrichment facility 38 from the receiving device 32 , for example by screws to solve. The detached enrichment device 38 can then, for example, with the interface 86 to the analyzer 88 in 9 be screwed on. At the same time, the receiving device 32 a clean one enrichment device 38 be screwed on, and the control process continues to be carried out.

In the analyzer 88 in 9 is an ion mobility spectrometer 90 or a mass spectrometer 92 arranged with which the enriched particles 26 that are in the over the interface 86 to the analyzer 88 bolted enrichment device 38 be analyzed. Next is in the analyzer 88 a heating device 93a and a gas generator 93b provided to the in the enrichment facility 38 absorbed particles 26 into the spectrometer 90 or 92 to convict.

The handheld metal detector 12 then puts in connection with the analyzer 88 an analysis device 94 for analyzing the particles 26 represents.

In an alternative embodiment of the analysis device 94 represented in 10 , is the analysis device 88 directly in the handheld metal detector 12 housed so as to directly after receiving the particles 26 to examine these for their chemical nature.

11 shows an overview of a procedure in which a person 10 is checked to see if they are hazardous substances 14 , Explosives 16 or drugs 18 with you.

The particles 26 can be used as vaporous particles 96 that is in a vapor-like state of aggregation 98 , or as particulate particles 100 , that is in smoke-like state of aggregation 98 , present. Depending on the configuration of the absorption device 40 this can preferably vaporous particles 96 or preferably particulate particles 100 However, it is also possible to enrich both at the same time.

In the handheld metal detector 12 is a flow control 102 arranged the following steps in the control of the person 10 controls.

First, the flow control commands 102 in a step A, the excitation of the particles 26 on the surface 19 the person 10 by the excitation device 42 , At the same time, step B will pick up the excited particles 26 by means of one of the rotor blades 34 generated negative pressure. Also, at the same time, step C ionization of the recorded particles 26 by activation of the ionization device 84 carried out. The sequence control 102 continues to provide after step C for step D transport of the ionized particles 26 to the enrichment facility 38 by the rotor blades 34 the receiving device 32 continue to run. The ionized particles 26 are now depending on their chemical nature as positive ions 104 , as negative ions 106 or as neutral particles 108 in front. The sequence control 102 ensures that the positive ions 104 and the negative ions 106 in a step E in the enrichment device 38 by absorption at the absorption device 40 enriched and at the same time the neutral particles 108 be sorted out in a step F. The sequence control 102 also commands step G desorbing on the absorber 40 absorbed particles 26 after this in the analyzer 88 have been studied.

After enriching in step E in the enrichment facility 38 becomes the enrichment facility 38 over the interface 86 from the receiving device 32 replaced and also over the interface 86 to the analyzer 88 for analyzing the enriched particles 26 connected. At the in 11 The analysis method shown is the analysis device 88 to a stationary analyzer 110 standing outside the handheld metal detector 12 is arranged.

So far was on explosives 16 and hazardous substances 14 only if suspected or randomly controlled. The hitherto customary methods are wipe samples, particle aspirators or the use of detection dogs. Wipe samples and particulate cleaners have the following drawbacks: they are laborious because additional personnel are required for sampling and analysis, and are time-consuming because sampling takes extra time, and moreover, sampling and detection are spatially and temporally separate operations. Furthermore, there is the disadvantage of a limited validity of the samples, as in persons 10 usually only the hands are examined, which has a large amount of time and result in the persons 10 is little accepted. Additionally, the persons accept 10 only limited the separation of other persons 10 and a subsequent wipe or suction of the entire body surface 19 is usually not desired. Disadvantages of the detection dog use are that the dog can only be used for a short time in the minute range and thus a check only randomly or suspicion is possible that a lengthy training of dogs and a high personnel costs make this procedure expensive and only a limited acceptance can be expected in person checks because not everyone likes dogs snooping around.

The hand-held metal detector according to the invention 12 allows to quickly and routinely determine if persons 10 or items explosives 16 and / or hazardous substances 14 to carry or contain or have come into contact with it. Through technical and temporal integration in, for example, at airports anyway customary, metal detection process high security, high Throughput and high social acceptance guaranteed.

This is a handheld metal detector (hand metal detector 12 ) with a hazard and explosives sampler (sampling device 24 ) combined. At the same time, a device for transferring the sample to an analysis system is integrated so that particles 26 , Dust or fumes with the handheld detector 12 can be recorded over a large area. Furthermore, an enrichment system in the handheld detector 12 integrated. In addition, a (pre-) analysis system in the handheld detector 12 to get integrated.

The integration is primarily in existing handheld detectors 12 for scanning people 10 and objects thought. These handheld detectors 12 are widely used in airports, but are also used in other security checks, for example for admission controls at major events, at public institutions, etc., are used. The progress in miniaturization of various sample collection and enrichment systems to be expected in the realization can be based on sampling devices 24 be transferred in analytical measuring devices.

In a usual handheld metal detector 12 intended to be a sampling device 24 and an enrichment device 38 for explosives 16 and hazardous substances 14 to get integrated. The collected substances are sent to a detection device, the analyzer 88 , which analyzes the sample in real time. In further development steps could into the handheld unit 12 additionally a detector 88 for pre-analysis or a complete analysis device 94 be integrated in miniaturized form. Since it is common, for example, at airports, people 10 or items with this handheld detector 12 Fully scanning results in the following advantages:
There is no need for a new work step, which can reduce costs and time and enable a high collection rate. At the same time, the entire body can be completely scanned to generate meaningful samples. At the persons 10 There is a high acceptance of the whole body scan, as the persons 10 these are used to metal searches. There is no additional space and staffing required by integration into the existing infrastructure. In addition, no consumables, such as wiping, required.

In the handheld unit 12 can turbines, infrared sources 48 , such as light emitting diodes 54 or laser 52 , Ultrasonic generator 58 or electrostatic charge generators 74 to get integrated. These components can be used singly or in combination to trace hazardous substances 14 and explosive traces 16 from the examination object and into the handheld unit 12 to convict. The collected samples are enriched, for example, in an integrated cartridge with absorption material. The handheld unit 12 is used in a base station, in which the sample is transferred, for example by heating and gas flow. In the base station is the analyzer, for example, an ion mobility 90 - or a mass spectrometer 92 which triggers an alarm if necessary. By alternately using two handheld units 12 where one is used for scanning while the other is at the base station, continuous sampling and analysis is possible. In a further expansion stage, an analysis device, for example a miniature ion mobility spectroscopy drift cell, could be used for pre-analysis and triggering a pre-alarm in the handheld unit 12 to get integrated.

For example, an ion mobility spectrometer metal scanner may be used as the handheld unit. Initially, a first step is carried out, in which the particles 26 through an air generator, a turbine 36 by acoustic excitation with, for example, ultrasound or infrasound (continuous or pulsed, that is, alternately with the second step recording), by thermal radiation, infrared or ultraviolet excitation, laser 52 , LED 54 , heated air flow or positive 104 or negative ions 106 in the air stream, the particles 26 lighter from the surface 19 can be removed. In a second step, the surface will be picked up 19 removed particles 26 by means of the turbine or pump 36 sucked into the ion mobility spectrometer metal scanner. In a third step, transport is alternately ionized with positive or negative charge impressions to differentiate the interesting groups and to sort out unwanted groups. In a fourth step enriching / desorbing vaporous and particulate phases are enriched and possibly also separated from each other.

LIST OF REFERENCE NUMBERS

10

person

12

Hand Held Metal Detector

13

weapon

14

Hazardous Substances

16

explosive

18

drugs

19

body surface

20

Metal detection device

24

sampling device

26

particle

30

stripper

32

recording device

34

rotor blade

36

Pump / turbine

38

enrichment device

40

absorber

42

exciter

44

light source

46

optical energy

48

infrared source

50

ultraviolet source

52

laser

54

led

56

sound generator

58

ultrasonic generator

60

Infra sound generator

62

sound wave

64

acoustic energy

66

heat source

68

Radiant heaters

70

Thermal energy

72

ionized airflow

74

charge generator

76

charged particles

77

ions

78

anions

80

cations

82

kinetic energy

84

ionization

86

interface

88

analyzer

90

Ion-mobility spectrometer

92

mass spectrometry

93a

Ausheizeinrichtung

94b

Gas Power Generator

94

analyzer

96

vaporous particles

98

Physical state

100

particulate particles

102

Flow control

104

positive ion

106

negative ion

108

neutral particle

110

stationary analyzer

A

excite

B

take up

C

ionization

D

transport

e

enrich

F

sort out

G

desorb

Claims (15)

Hand-held metal detector ( 12 ) with a metal detection device ( 20 ) for detecting metals and with a sampling device ( 24 ) for picking up particles ( 26 ) for the purpose of particle analysis, in particular of hazard ( 14 ) and / or explosive particles ( 16 ). Hand-held metal detector ( 12 ) according to claim 1, characterized in that the sampling device ( 24 ) a detachment device ( 30 ) for detaching the particles ( 26 ) from a surface ( 19 ) and a receiving device ( 32 ) for picking up the detached particles ( 26 ) having. Hand-held metal detector ( 12 ) according to claim 2, characterized in that the removal device ( 30 ) an excitation device ( 42 ) for the energetic excitation of the particles ( 26 ) and / or an electrostatic charge generator ( 74 ) having. Hand-held metal detector ( 12 ) according to claim 3, characterized in that the excitation device ( 42 ) a turbine ( 36 ), an infrared source ( 48 ), in particular a light-emitting diode ( 54 ) or a laser ( 52 ), an ultrasonic generator ( 58 ), an ultraviolet source ( 50 ), an infrasonic generator ( 60 ) and / or a heat source ( 66 ) having. Hand-held metal detector ( 12 ) according to one of claims 2 to 4, characterized in that the receiving device ( 32 ) a turbine and / or a pump ( 36 ) having. Hand-held metal detector ( 12 ) according to one of the preceding claims, characterized in that the receiving device ( 32 ) an enrichment facility ( 38 ) for enriching the recorded particles ( 26 ), wherein an absorption device ( 40 ) for absorbing the captured particles ( 26 ) depending on their charge direction ( 104 . 106 . 108 ) and / or depending on their state of aggregation ( 98 ) is provided. Hand-held metal detector ( 12 ) according to one of the preceding claims, characterized in that an ionization device ( 84 ) for applying charge to the received particles ( 26 ) is provided. Analysis device ( 94 ) for analyzing particles ( 26 ), in particular of danger ( 14 ) and / or explosive particles ( 16 ), with a handheld metal detector ( 12 ) according to one of claims 1 to 7 and with an analysis device ( 88 ) for analyzing the particles ( 26 ). Analysis device ( 94 ) according to claim 8, characterized in that the analysis device ( 88 ) an ion mobility spectrometer ( 90 ) and / or a mass spectrometer ( 92 ) having. Analysis device ( 94 ) according to one of claims 8 or 9, characterized in that the analysis device ( 88 ) in the hand-held metal detector ( 12 ) is arranged. Control procedure for checking whether persons ( 10 ) or objects carry dangerous goods or objects, with the steps of a) checking a surface ( 19 ) the person ( 10 ) or the object with a hand-held metal detector ( 12 ); b) detachment of particles ( 26 ), in particular of danger ( 14 ) and / or explosive particles ( 16 ), from the surface ( 19 ) with the hand-held metal detector ( 12 ); c) picking up the detached particles ( 26 ) with the hand-held metal detector ( 12 ); and d) enriching the recorded particles ( 26 ) in the hand-held metal detector ( 12 ). A method according to claim 11, characterized in that step a) the step a1) energetic excitation of the particles ( 26 ), wherein the particles ( 26 ) especially energy in the form of kinetic energy ( 82 ), acoustic energy ( 64 ), optical energy ( 46 ) and / or heat energy ( 70 ) and / or that in step a) the particles ( 26 ) for detachment with ions ( 78 ) and / or that step b) comprises the step b1) sucking in the detached particles ( 26 ) into the enrichment facility ( 38 ) having. Method according to one of claims 11 or 12, characterized in that the particles ( 26 ) in an absorption device ( 40 ), whereby the particles ( 26 ) in particular depending on their state of aggregation ( 98 ) are enriched. Method according to one of claims 11 to 13, characterized in that step c) comprises the step c1) ionizing the recorded particles ( 26 ) for applying a charge to the particles ( 26 ) in the enrichment facility ( 38 ), wherein the charged particles ( 26 ) (in step D), in particular depending on its charge direction ( 104 . 106 . 108 ) are enriched. Method according to one of claims 11 to 14, characterized in that after step c) a step d) analyzing the enriched particles ( 76 ), in particular that step d) in the hand-held metal detector ( 12 ) and / or step d) the step d1) transfer of the enriched particles ( 26 ) from the hand-held metal detector ( 12 ) into an analysis device ( 88 ).

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