Accession Number:
ADD010328
Title:
Acoustic Doppler Detector.
Descriptive Note:
Patent,
Corporate Author:
DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s):
Report Date:
1982-06-29
Pagination or Media Count:
7.0
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:
Subject Categories:
- Acoustic Detection and Detectors
- Acoustics