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<p>Photon Doppler Velocimetry (PDV) is widely used to study the dynamic behavior of materials. As in all related measurement technologies, the minimum detectable signal (MDS) is an important attribute of the system. The MDS specifies the minimum signal required for a successful measurement of velocity. Information in the literature on the MDS for PDV is quite sparce. In this contribution, we suggest a definition of the MDS that is the amount of energy within the analysis window that gives a signal to noise ratio of 10 in the frequency domain. We also introduce the minimum detectable relative signal (MDRS), which is the MDS divided by the power launched on target. This specification defines how dark of a target is measurable. We calculate the MDS for the ideal case where the noise is dominated by only the shot noise of the laser as well as the general case where noise originating from the digitizer and photodetector are important. We show that these calculations can reasonability predict the performance of a real system.</p>

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A Minimum Detectable Signal Specification for Photon Doppler Velocimetry

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月18日

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  • P. W. Younk,
  • N. F. Maatouk,
  • J. T. Neubauer,
  • M. R. Palacios-Trujillo,
  • J. A. Stephenson

摘要

Photon Doppler Velocimetry (PDV) is widely used to study the dynamic behavior of materials. As in all related measurement technologies, the minimum detectable signal (MDS) is an important attribute of the system. The MDS specifies the minimum signal required for a successful measurement of velocity. Information in the literature on the MDS for PDV is quite sparce. In this contribution, we suggest a definition of the MDS that is the amount of energy within the analysis window that gives a signal to noise ratio of 10 in the frequency domain. We also introduce the minimum detectable relative signal (MDRS), which is the MDS divided by the power launched on target. This specification defines how dark of a target is measurable. We calculate the MDS for the ideal case where the noise is dominated by only the shot noise of the laser as well as the general case where noise originating from the digitizer and photodetector are important. We show that these calculations can reasonability predict the performance of a real system.