PHASE MODULATED PULSE INTERFEROMETRY FOR MULTI-CHANNEL ULTRASOUND DETECTION

摘要

A method comprising: generating a pulsed laser beam comprised of non-interfering pulse-pairs having a phase difference, wherein said phase difference changes between each two consecutive cycles of said pulse-pairs; directing said pulsed laser beam at one or more optical resonators, wherein each of said one or more optical resonators is impinged by acoustic waves, to cause said pulsed laser beam to propagate through each of said one or more optical resonators, thereby interfering said pulse-pairs; and calculating shifts in a spectral response of each of said one or more optical resonators based on measuring said interference, wherein said shifts are indicative of a waveform of said acoustic waves.