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Laser velocimeter-spatial coherence and velocity measurements in water

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Abstract

Experiments were carried out to measure the optical coherence of an argon laser beam in tap water, distilled water, ocean coastal water and in processed water with 3% sodium chloride added. Measurements were made for water path lengths up to 2.9 m using two different procedures. The first was Young's experiment and the second involved an optical geometry common to the Laser Doppler Velocimeter. Results showed no degradation in the normalized degree of coherence over the measured distances. However, local changes in the index of refraction did cause the interference fringes to have some motion (approximately one-fourth of a fringe width). Tests were also carried out using the Laser Doppler Velocimeter in the back-scatter mode to measure the centre line velocity of a submerged jet. Results agreed very well with independent measurements.

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Authors and Affiliations

  1. Naval Ordnance Laboratory, Silver Spring, Maryland

    R. E. Lee, W. J. Yanta & B. J. Crapo

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  1. R. E. Lee
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  2. W. J. Yanta
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  3. B. J. Crapo
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Lee, R.E., Yanta, W.J. & Crapo, B.J. Laser velocimeter-spatial coherence and velocity measurements in water. Opto-electronics 5, 41–51 (1973). https://doi.org/10.1007/BF01421900

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