Accession Number : AD0783030

Title :   Transducer Calibration Facility at Morris Dam.

Descriptive Note : Research and development rept. Jul 65-Jun 74,


Personal Author(s) : Younger,Udene E.

Report Date : JUL 1974

Pagination or Media Count : 65

Abstract : This report, a revision of NAVWEPS Report 8762, NOTS TP 3844, documents changes made at the Morris Dam transducer calibration facility since publication of the original document. Since 1965, there have been many additions and improvements, resulting in the following capabilities: transmitting responses of transducers can be measured from 10 Hz to 150 kHz and receiving responses from 40 Hz to 150 kHz; directivity can be plotted automatically from 10 Hz to 150 kHz with a motor-driven transducer rotator and a synchronized polar recorder; the resistive and reactive components of transducer impedance can be plotted automatically from 100 Hz to 200 kHz with a complex impedance-admittance meter and an X, Y recorder. They can also be measured point-by-point, 20 Hz to 20 kHz, with an impedance-admittance bridge. The facility also includes a new transducer-mounting apparatus for positioning and rotating transducers underwater and new electronic equipment. Such efforts to improve both equipment and procedures are continuing, with present emphasis on automatic operation and other techniques to reduce operating time. (Author)

Descriptors :   *Electroacoustic transducers, *Calibration, *Test facilities, Hydrophones, Acoustic waves, Electronic equipment, Sensitivity, Impedance, Direction finding, California

Subject Categories : Electrical and Electronic Equipment
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE