Microphone Coverings for a Helicopter Mounted Acoustic Locator.

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Abstract:

An investigation was initiated for the purpose of finding a microphone covering which would not attenuate noise signals significantly and which would provide protection against moisture, dust or other conatminatio. The microphones are mounted in an airfoil pod which is attached to a helicopter as part of an acoustic locator system. As a result of the investigations, a suitable covering was developed which consisted of thin mylar covering over a supporting disc with many chambered holes. Results of the investigations are presented. Author-PL

Author(s):
Kayser, L. D. ; Spurk, J. H.
Author Organization(s):
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
Descriptive Note:
Memorandum rept.,
Pagination:
0071

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
BRL-MR-2008
Project Number(s):
RDT/E-1-T-262301-A-201
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*HELICOPTERS, OCEAN SURVEILLANCE), (*ACOUSTIC DETECTORS, MICROPHONES), (*MICROPHONES, PROTECTIVE COVERINGS), ANTISUBMARINE WARFARE, POLYESTER PLASTICS, EXTERNAL STORES, MOISTUREPROOFING, DUST
Field(s)/Group(s):
Undersea and Antisubmarine Warfare, Acoustic Detection and Detectors
Report Date:
1969 Sep 01