A dual-amplifier hot-wire anemometerThe conceptual design of a dual-amplifier constant-temperature hot-wire anemometer is described. This hot-wire anemometer consists of three basic independent modules: a Wheatstone bridge in which the hot wire is one of its arms, an error-correction amplifier, and a voltage-controlled current source. The last two modules constitute the feedback network of this hot-wire anemometer. Thus the output voltage across the wire is a true function of the instantaneous changes in the wire resistance induced by the cooling effect of the flow. The dual-amplifier is capable of reaching relatively high frequency response through adequate selection of its active elements. Suitable gain of the error-correction amplifier and proper choice of the transfer function of the current source has yielded a frequency bandwidth up to 200 kHz.
Document ID
19790058036
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Sadeh, W. Z. (Colorado State Univ. Fort Collins, CO, United States)
Finn, C. L. (Colorado State University Fort Collins, Colo., United States)