Remote Target Identification Using Laser Doppler Vibrometry

摘要

A laser Doppler vibrometer architecture and detection technique that can remotely identify targets based on their natural vibration frequencies using a scanning Fabry-Pérot interferometer. The proposed systems and methods can have stand-off distances longer than the coherence length of the laser by using spectroscopic detection methods instead of coherent heterodyne detection using a local oscillator. Pulsed lasers can be used which have high power output. In addition, by not using an acousto-optic modulator, the speed of the detectable target is not limited. Also the mixing efficiency of the return signal can be improved.

主权项

1. A system comprising:
a laser device; an optical circulator optically coupled to said laser device; a telescope optically coupled to said optical circulator; a tunable interferometer optically coupled to said optical circulator; a photodetector optically coupled to said tunable interferometer; and a signal processor electrically coupled to said photodetector.