Recovery of rectified signals from hot-wire/film anemometers due to flow reversal in oscillating flows

Yingchen Yang, Douglas L. Jones, Chang Liu

Research output: Contribution to journalReview article

Abstract

Hot-wire/film anemometers have been broadly used in experimental studies in fluid mechanics, acoustics, and ocean engineering. Yet, it is well known that hot-wire/film anemometers rectify the signal outputs due to the lack of sensitivity to flow direction. This main drawback, in turn, makes them less useful for diverse fluctuating flow measurements. To solve this issue, a rectification recovery method has been developed based on reconstruction of the Fourier series expansion in conjunction with signal-squaring approach. This signal recovery method was experimentally examined and proven to be successful for both conventional and microfabricated hot-wire/film anemometers. The method was further applied to dipole field measurements, with data from recovered signals perfectly matching the analytical model of the dipole field.

Original languageEnglish (US)
Article number015104
JournalReview of Scientific Instruments
Volume81
Issue number1
DOIs
StatePublished - Feb 8 2010

ASJC Scopus subject areas

  • Instrumentation

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