Portal de Periódicos da CAPES

Method for fast sine-wave calibration of hot-wire frequency response

1990; American Institute of Physics; Volume: 61; Issue: 3 Linguagem: Inglês

10.1063/1.1141437

1527-2400

D. A. Walker, Mort Walker,

Aerodynamics and Acoustics in Jet Flows

Direct measurement of the transfer function of hot-wire anemometers is needed whenever any turbulence frequencies approach the hot-wire frequency response. In particular, in high-speed applications it is not possible to obtain hot-wire frequency response sufficient to capture all of the turbulent kinetic energy. With knowledge of the hot-wire response, either an estimate of the turbulent integral scale or an approximation of the high-frequency part of the turbulent spectrum may be sufficient to correct measurements by post-detection frequency compensation. Described in this article are simple electronic circuits and a technique for obtaining sine-wave test frequency response of a hot-wire anemometer in a very short time without prohibitively high sampling rates.