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Accession Number:
ADA067276
Title:
Development of PVF2 Noise-Cancelling Microphone
Corporate Author:
VOUGHT CORP ADVANCED TECHNOLOGY CENTER DALLAS TX
Report Date:
1979-03-01
Abstract:
This report describes the theory, development, and performance of a noise-cancelling microphone for military use. The generating element is a bimorph annulus, constructed by bonding plastic films of piezoelectric PVF2 polyvinlidene fluoride to a central shim of aluminum. The aluminum shim controls the stiffness of the bimorph so that wide-bandwidth operation is obtained over a temperature range of -51 C to 71 C. The fundamental resonance frequency is above the speech frequency range so that damping structures are not required. The microphone includes a preamplifier. The microphone assembly is similar to that of a previously developed piezoceramic microphone. The sensitivity of the PVF2 bimorph is 10 dB less than that of the piezoceramic bimorph. The PVF2 film has a deposited aluminum electrode which was found to require careful handling to avoid loss of electrical continuity. Except for considerations of the integrity of the PVF2 electrode, the PVF2 material provides a rugged, highly-linear, noise-cancelling microphone. Author
Descriptive Note:
Final technical rept. Jul 1977-Jan 1979
Supplementary Note:
DOI: 10.21236/ADA067276
Pages:
0054
Distribution Statement:
Availability: Document partially illegible.
Contract Number:
DAAB07-77-C-0162
File Size:
2.12MB
