Measuring and testing – Meteorology – Electric disturbance
Patent
1974-08-01
1977-02-01
Haroian, Harry N.
Measuring and testing
Meteorology
Electric disturbance
73339R, G01W 100, G01K 100
Patent
active
040056023
ABSTRACT:
Apparatus for determining atmospheric temperature which provides for measurement of the speed of sound at a given altitude from which the derivative temperature at the same altitude can be calculated. In one form, the apparatus comprises a light and sound emitting device such as an explosive mechanism, a light signal receiver and a sound signal receiver supported a known distance from the light and sound emitting device, and a telemetry transmitter. Upon actuation, the light and sound emitting device simultaneously emits a light signal and a sound signal. The respective signals are received and transmitted to remote receivers and recorders. The measurement of the time lapse from reception of the light signal to reception of the sound signal is recorded whereupon the speed of sound and thus the derivative temperature at a particular altitude can be calculated by well known formulas. In another form of the invention two sound receivers are used spaced a known distance from each other. In still another form, the sound emitting and receiving devices are mounted side-by-side on a cord suspended from a parachute and the time required for sound to reflect off the parachute and travel back to the sound receiver is used to measure the speed of the sound. In yet another form, the difference in time required for the sound to travel through the cord and through the atmosphere is utilized.
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Sound Velocity as a Measurement of Gas Temp., Hedrich & Pardue.
"Temp.-Its Measurements & Control", vol. 2, 1955, pp. 383-392, Reinhold Pub. Corp.
Pub. Inst. of the Rocket-Grenade . . . Measuring Atm. Temp., Stroud et al., 5/55.
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