A sensor is provided for measuring the speed of a moving sports object, particularly an object being shot or launched, for example, from a gun, bow or other implement, such as a bullet or paint ball being shot from a gun or an arrow being shot from a bow. The sensor is operable over a short range and...http://www.google.co.uk/patents/US6666089?utm_source=gb-gplus-sharePatent US6666089 - Miniature sports radar speed measuring device
