Accession Number : AD0861006

Title :   Microphone Coverings for a Helicopter Mounted Acoustic Locator.

Descriptive Note : Memorandum rept.,

Corporate Author : ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Kayser, L. D. ; Spurk, J. H.

Report Date : SEP 1969

Pagination or Media Count : 71

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)

Descriptors :   (*HELICOPTERS, OCEAN SURVEILLANCE), (*ACOUSTIC DETECTORS, MICROPHONES), (*MICROPHONES, PROTECTIVE COVERINGS), ANTISUBMARINE WARFARE, POLYESTER PLASTICS, EXTERNAL STORES, MOISTUREPROOFING, DUST.

Subject Categories : Undersea and Antisubmarine Warfare
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE