Detection of speed or vibrations using a heterodyne LIDAR lidar device

摘要

a measuring method of characteristics vu00e9locimu00e9triques or vibromu00e9triques using lidar type device separates a useful contribution (rv) with respect to a parasitic input in a backscattered signal (rp). for this, a characteristic of phase of an optical wave which is emitted in the direction of a target volume is modulated.the contribution of the parasite, which comes from a source or target volume is variable with the characteristic of phase shifts in the heterodyne detection signal. an accumulation allows to isolate the contribution, from which a result is obtained for the measurement vu00e9locimu00e9trique or vibromu00e9trique.the method may be implemented with a frequency modulation or phase modulation of the optical wave.