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Abstract <p>The first part of the work sets out the problem for a method of constructing correction coefficients to compensate for distortions introduced by the non-uniform frequency characteristics of the electronic path of a laser Doppler velocimeter into the spectral density of Doppler signals. The method relies on averaging a statistical ensemble of the spectral densities of noise signals obtained during illumination of a photodetector by a white light source, constructing the inverse function to the averaged spectral density acquired with truncation in the low- and high- frequency bands, and applying digital low-pass filtering to it. A model numerical experiment has been carried out. The results of the experiment are presented, and they confirm increase in the velocity measurement error as the flow rate grows.</p>

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Correcting Spectral Density of Laser Doppler Anemometer Signals during Measuring of High-Speed Aerodynamic Flows. Part 1

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • V. V. Rakhmanov,
  • I. K. Kabardin,
  • A. V. Klimov,
  • V. G. Glavny,
  • D. V. Kulikov,
  • V. G. Meledin,
  • S. V. Dvoynishnikov,
  • V. O. Zuev,
  • G. V. Bakakin,
  • V. A. Pavlov

摘要

Abstract

The first part of the work sets out the problem for a method of constructing correction coefficients to compensate for distortions introduced by the non-uniform frequency characteristics of the electronic path of a laser Doppler velocimeter into the spectral density of Doppler signals. The method relies on averaging a statistical ensemble of the spectral densities of noise signals obtained during illumination of a photodetector by a white light source, constructing the inverse function to the averaged spectral density acquired with truncation in the low- and high- frequency bands, and applying digital low-pass filtering to it. A model numerical experiment has been carried out. The results of the experiment are presented, and they confirm increase in the velocity measurement error as the flow rate grows.