High Pressure Transducer.
Technical rept. no. 2, Mar-Aug 73,
GTE GOVERNMENT SYSTEMS CORP MOUNTAIN VIEW CA SYLVANIA SYSTEMS GROUP-WESTERN D IV
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This second installment in the evaluation of the coaxial cable electret transducer for use as a hydrophone reports the results of a series of tests on 10 ga electret cable samples. Included are tests to determine absolute sensitivity over the frequency range 10-1000 Hz and for the range of ambient pressures from 0.1 to 17.3 MPa, to determine the relative sensitivity of the transducers to vibration, to determine any effects caused by operating temperature from 0C to 35C and to determine the long term effects of exposure to high pressures on the transducers. The absolute sensitivity predicted theoretically is found to agree with the measured value of about -175 dB re 1 pCmicroPa. The sensitivity is only a function of frequency above about 300 Hz where radial resonance effects are suspected and the variation with ambient pressure is typically within or -3 dB for short term exposure. For exposure of more than one week substantial degradation was observed. Appreciable temperature degradation is also observed especially at low temperatures. The relative vibration sensitivity is about 200 Pag. Author
- Electrical and Electronic Equipment