Accession Number : AD0693096

Title :   ELECTRONIC INSTRUMENTATION OF A 10,000-PSIG UNDERWATER SOUND TRANSDUCER CALIBRATION FACILITY FOR THE 10- TO 4000-Hz FREQUENCY RANGE,

Corporate Author : NAVAL RESEARCH LAB ORLANDO FLA UNDERWATER SOUND REFERENCE DIV

Personal Author(s) : Ford,Robert E. ; Browder,Lynn P.

Report Date : 15 AUG 1969

Pagination or Media Count : 16

Abstract : The electronic instrumentation of a new measuring facility for calibrating underwater sound transducers at controlled temperature from 3 to 45C in the frequency range 10 to 4000 Hz at hydrostatic pressure to 10,000 psig is described. The pressure vessel consists of a vertically mounted 20.3-cm-i.d. stainless-steel tube 274.3 cm long. An active-impedance termination can be established at one or both ends of the tube to provide a plane, progressive wave within it. Three phase- and amplitude-adjustable outputs from the signal source activate the source transducer and those that control the terminal impedance. Multiple probe transducers and receiving channels serve to establish and monitor the required wave condition. Delay lines enable rapid and convenient adjustment to obtain minimum standing-wave ratio. (Author)

Descriptors :   (*TEST FACILITIES, HYDROPHONES), CALIBRATION, ELECTROACOUSTIC TRANSDUCERS, HYDROSTATIC PRESSURE, IMPEDANCE MATCHING, DELAY LINES, PRESSURE VESSELS

Subject Categories : Test Facilities, Equipment and Methods
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE