Interfering wave detection technique for coherent doppler lasers

摘要

The interfering wave detection technique has a laser producing two beams. The first (F1) illuminates the target and the signal return is focussed (36) onto a detector. The second beam (F2) is reflected directly to a detector using a mirror system (31,35) and forming a reference signal. The reference wave is a plane wave, and produces an interference pattern at the detector with the incoming target signal return, producing a doppler signal (38).