Abstract
This paper describes a simple multichannel manometer for aerodynamic and gas-dynamic measurements. The instrument makes use of optical interferometric techniques, using a laser light source. The output of the manometer is in the form of a photographic record of an interference fringe pattern, from which variations of pressure with time may be deduced. The sensitivity of the manometer remains constant over a wide pressure range. The response of the instrument is considerably faster than that of a liquid manometer or mechanical pressure gauge, and approaches that of a conventional pressure transducer. The main factors limiting the response are discussed.
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