Application of the method for determining the frequency response of a constant-temperature hot-wire anemometer using a laser pulse

This publication is a continuation of research on finding the frequency response (FR) for a constant-temperature hot-wire anemometer which is based on the impact of a short-time pulse applied directly to a sensitive element of the probe; this emulates a delta-function impact. The thermal pulse is created by laser radiation. This approach allows evaluating the influence of FR-distorting factors like different settings for a hot-wire anemometer and varying the flow velocity. The study gives practical recommendations on choosing the intensity of impact/power of laser radiation for correct FR evaluation. The practical application of this method was demonstrated through comparing the pulsation spectra in a boundary layer.