Anemometers heated-thermocouple

The heated-thermocouple anemometer measures gas velocity from the cooling effect of the gas stream flowing across the hot junctions of a thermopile supplied with constant electrical power input. Alternate junctions are maintained at ambient temperature, thus compensatiug for the effect of ambient temperature. For details see Bunker, Proc. Instrum. Soc. Am., 9, pap. 54-43-2 (1954). 

There are many different types of anemometers for measuring air speed. Desirable features for assessing thermal conditions are portability, durability, and mggedness. Also important are having a nondirectional sensor, sensitivity at low speeds, and fast response time. Instruments with a heated sensing device (heated thermocouple, heated thermistor, or hot wire) provide these features. 

Heat Based Anemometer Heated wire, thermocouple or thermistor anemometers measure air velocity, temperature or static pressure. Some types make nondirectional air velocity measurements. 

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