NASA NTRS · 19660000313
Phonocardiograph microphone is rugged and moistureproof
Abstract
Microphone used as a phonocardiograph transducer monitors small amplitude audio signals in the presence of large shock loads and high humidity. It contains a lead zirconate-lead titanate piezoelectric plate encapsulated in a flexible polyurethane resin. The resin is contained in a sealed nylon case having a diameter of less than one inch.
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Young, W. J.. 1966-07-01. Phonocardiograph microphone is rugged and moistureproof. https://ntrs.nasa.gov/citations/19660000313
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