Abstract
Work done so far indicates the feasibility of using a gas jet generator as a temperature-frequency converter for the measurement of air or gas temperature up to 2000°R. In its optimum configuration for stability and level of output, the gas jet generator is not quite of constant wavelength characteristic. This does not matter, provided that any particular configuration is calibrated by using an airstream of known stagnation temperature and these results are used to predict the performance with other specified gases or gas mixtures. In comparison with thermocouple instruments such as the sonic suction pyrometer the gas jet generator is superior from the transient response and mechanical strength aspects, but inferior for steady state measurements, particularly at the higher temperatures. This is because its sensitivity decreases with increase in temperature owing to the square root relationship between the velocity of sound and absolute temperature.
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