Accuracy of a laser doppler velocimeter for instantaneous velocity measurements on rotating solid surfaces

Milind M. Rajadhyaksha; Warren H. Stevenson

doi:10.1117/12.35055

1 October 1990 Accuracy of a laser doppler velocimeter for instantaneous velocity measurements on rotating solid surfaces

Milind M. Rajadhyaksha, Warren H. Stevenson

Author Affiliations +

Proceedings Volume 1375, ICALEO '89: Optical Sensing and Measurement; (1990) https://doi.org/10.1117/12.35055
Event: ICALEO89, 1989, Orlando, FL, United States

Abstract

This paper presents the results of an analytical and experimental investigation of the accuracy of a laser Doppler velocimeter (LDV) for solid surface velocity measurements made over very short averaging times (less than a millisecond). Fundamental limitations exist on the accuracy of such ''instantaneous'' measurements. For frequency domain signal processing (spectrum analysis) the accuracy is limited by finite transit time broadening and, in the case of a rotating surface, tangential velocity gradient broadening. For time domain processing (time period measurement) the accuracy is limited by stochastic phase variations in the nominally sinusoidal signal. Experiments were conducted using both signal processing techniques to determine the conditions needed to minimize the error in instantaneous measurements using the LDV. An analysis of the relative performance of a laser speckle velocimeter is also included.

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Milind M. Rajadhyaksha and Warren H. Stevenson "Accuracy of a laser doppler velocimeter for instantaneous velocity measurements on rotating solid surfaces", Proc. SPIE 1375, ICALEO '89: Optical Sensing and Measurement, (1 October 1990); https://doi.org/10.1117/12.35055

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