Laser retroreflector system for identification of friend or foe
Digital microphone Patent #: 4422182
ApplicationNo. 06/444627 filed on 11/26/1982
US Classes:398/134, Including optical fiber or waveguide359/285, Acousto-optic381/172Light modifying
ExaminersPrimary: Orsino, Joseph A.
Assistant: Greer, Timothy K.
Attorney, Agent or Firm
International ClassesH04R 27/00 (20060101)
H04R 23/00 (20060101)
AbstractThe invention is a laser microphone in which two aligned beams of laser light, of which one beam is slightly delayed in relation to the other beam of the same frequency and is reflected by an object in motion, to produce intensity variation that vary as a function of the movements of the reflecting object.