A new technique for measuring temperatures by means of the velocity of sound in a gas is described. A closed-end, gas-filled pipe is excited to longitudinal acoustic resonance, and the resonant frequency is measured. The temperature of the gas is then determined from the well-known relations between the temperature and the velocity of sound. The generation and detection of acoustic waves are carried out by a transceiver which is remote from the measuring region and which is connected to the cavity by a small-diameter, gas-filled tube. The technique is particularly well suited to high-temperature studies in nuclear-radiation environments.
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Joseph H. Apfel (1962) studied this question.
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