NDLI: Acoustic sensor engineering evaluation test report. [microphones for monitoring inside the space shuttle orbiter

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Acoustic sensor engineering evaluation test report. [microphones for monitoring inside the space shuttle orbiter

Content Provider	NASA Technical Reports Server (NTRS)
Author	Bronson, R. D. Phillips Jr., E. L.
Copyright Year	1976
Description	Two types of one-inch diameter sound pressure level sensors, which are candidates for monitoring ambient noise in the shuttle orbiter crew compartment during rest periods, were exposed to temperature, passive humidity, and vibration. One unexposed sensor of each type served as a reference unit. Except for the humidity exposures, each of the three capacitive microphones was individually tested in sequence with the essential voltage power supply and preamplifier. One unit exibited anomalous characteristics after the humidity exposure but returned to normal after being dried in an oven at 115 deg for two hours. Except for the humidity exposures, each of the three piezoelectric microphones was individually tested with a laboratory type amplifier. Two apparent failures occurred during these tests. The diaphragm on one was found ruptured after the fourth cycle of the humidity test. A second sensor showed an anomaly after the random vibration tests at which time its sensitivity was consistent at about one-half its former value.
File Size	4687805
Page Count	76
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19790013156
Archival Resource Key	ark:/13960/t2n63b58p
Language	English
Publisher Date	1976-06-01
Access Restriction	Open
Subject Keyword	Capacitors Piezoelectric Transducers Monitors Environmental Tests Vibration Effects Exposure Space Shuttle Orbiters Failure Sound Pressure Electronic Equipment Tests Microphones Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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