Accession Number : ADD000233

Title :   Laser Heterodyne Acoustic Sensor.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Albares,Donald J

Report Date : 02 Apr 1974

Pagination or Media Count : 6

Abstract : The patent relates to first and second pairs of reflective elements including a single laser cell, defining adjacent, parallel, resonant optical paths of different lengths through the same laser medium. One of the resonant optical paths is exposed to acoustic energy, changing its effective optical path length and the wavelength of the laser energy emitted by that path. Changes of the beat frequency between the two laser beams generated in the two resonant optical paths are detected and appropriately displayed as an indication of the intercepted acoustic energy.

Descriptors :   *Acoustooptics, *Acoustic detectors, *Patents, Laser beams, Heterodyning

Subject Categories : Acoustic Detection and Detectors
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE