Abstract
A machine-fabricated coaxial cable with FEP—teflon for dielectric and jacket was thermoelectrically treated to pole the dielectric layer. Segments of the resulting electret cable were sealed and tested for sensitivity to underwater acoustic signals over the frequency range 10–1000 Hz, the ambient pressure range 0–17 MPa, and at a few temperatures down to 5 °C. The initial sensitivity of a 0.5-m-long sample is about −169 dB re 1 pC/μPa. Although the sensitivities of most samples were found to be nearly independent of temperature and frequency, they were significantly affected by ambient pressure. The complicated dependence of sensitivity on ambient pressure is explained and verified on the basis of additional experiments and on the basis of a mathematical model derived for this transducer.
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