Accession Number : ADD010328

Title :   Acoustic Doppler Detector.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Delagrange,Arthur D ; Pryor,Cabell N , Jr ; Wilson,Wayne D

Report Date : 29 Jun 1982

Pagination or Media Count : 7

Abstract : An oscillator generates a fixed frequency ultrasonic output signal. After power amplification this signal drives a transmitting transducer which projects an ultrasonic beam into water. Reflected signals are received by a receiving transducer and AGC preamplified. A chopper multiplies the received signal with the transmitted signal and generates an output signal if a target exists. To determine whether the target is a swimmer, this output signal is band pass filtered and amplified and then fed both to an automatic alarm and to a set of headphones. A human operator listening to the headphone output classifies the target and determines exact bearing. (Author)

Descriptors :   *Patents, *Acoustic detectors, *Doppler systems, *Ultrasonic frequencies, oscillators, Transducers, Beams(Radiation), Ultrasonic radiation, Water, Reflection, Receivers, Amplifiers, Inventions

Subject Categories : Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE