Laser Doppler anemometer for measuring superlow velocities

Rinkevichyus, B. S.; Tolkachev, A. V.; Sutorshin, V. N.; Chebunin, V. G.

doi:10.1007/bf00865941

Cited by 2 publications

(2 citation statements)

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“…The velocity demodulation is carried out based on the fringe pattern model. From Figure 1 and Figure 2 b, the fringe spacing ε could be obtained [ 18 ],

…”

Section: Principle and Measurement Systemmentioning

confidence: 99%

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An Integrated Interferometric Fiber Optic Sensor Using a 638 nm Semiconductor Laser for Air-Water Surface Velocity Measurements

Song

Zhang

Li-li

et al. 2023

Sensors

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An integrated interferometric fiber optic velocimetry sensor has been proposed and demonstrated at the central wavelength of 638 nm. The sensor is based on the principle of two laser-beams’ interference. The light signal scattered from the particles or vapor is demodulated to measure the water surface velocity and water vapor velocity. Three velocity measurement experiments are carried out to measure the velocity, and the experimental data shows that the velocity increases linearly in the range of 4 mm·s−1 to 100 mm·s−1, with a slope of linear fitting curve of 0.99777 and the R-Square of 1.00000. The velocity calculated from frequency shift fits well with the reference velocity. The maximum average relative error in the three velocity measurements is less than 2.5%. In addition, the maximum speed of 4.398 m·s−1 is confirmed in the rotating disk calibration experiment, which expands the sensor’s velocity measurement range. To solve the problem that it is difficult to directly measure the velocity of small-scale water surface flow velocity, especially from the aspect of the low velocity of air-water surface, the interferometric fiber optic sensor can be applied to the measurement of water surface velocity and wind velocity on the water surface.

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“…The velocity demodulation is carried out based on the fringe pattern model. From Figure 1 and Figure 2 b, the fringe spacing ε could be obtained [ 18 ],

…”

Section: Principle and Measurement Systemmentioning

confidence: 99%

“…And the velocity is expressed as [ 18 ]:

where ε is the fringe spacing between the centers of two bright fringes, λ is the wavelength of the light, δ is the half-angle between the two interference beams and f is the frequency shift that can be obtained from the photodiode by the electric signal.…”

Section: Principle and Measurement Systemmentioning

confidence: 99%