Reproducing the temporal averaging process of the acoustic Doppler velocimeter and assessing its impact on turbulence measurements

The temporal averaging process (TAP) in Acoustic Doppler Velocimeters (ADVs) and its impact on turbulence measurement have been extensively studied. However, few studies have successfully replicated TAP. This paper utilizes a self-developed ultrasonic velocimeter recording raw acoustic signals, achieving TAP through pulse signal concatenation. Results from open-channel flow velocity measurements demonstrate measurement accuracy. Exploring TAP's effects on turbulence measurement, three velocity sequences with varying data qualities are analyzed. Proportion of valid data increases after TAP, with similar growth rates across different sampling volumes. Turbulence intensity decreases linearly with TAP, correlating with data quality. Employing an enhanced denoising method, a comparison suggests potential gradual reduction in Doppler noise with TAP implementation. This study offers valuable insights into turbulence measurement in ADV.