高温ガス用流速センサ

概要

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A durable gas flow sensor applicable to hot and dusty gas has been developed based on the measured cooling time constant of a heated probe in the flow. This sensor, consisting of double concentric cylindrically coiled heaters (similar to double concentric cylindrical shells), can reduce the radiative heat transfer, which may cause serious error during use at temperatures higher than 400℃, to a negligible amount. The outer temperature-controlled shell of the sensor functions as a radiation shield for the inner shell which acts as the flow sensing probe. This sensor can achieve an accuracy of ±10% in the velocity range of 0.7m/s〜7m/s with gas temperature ranging from room temperature to 600℃. The concept structure and experimental results for the sensor are described and discussed.
1996-10-25