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Proceedings Paper

Measurement Of The Mean Surface Velocity Of River Flow By Use Of An Optoelectrical Speed Sensor
Author(s): Yasumasa Itakura; Shin-ichi Taniguchi
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Paper Abstract

An image-velocity sensor with a parallel-slit reticle, a kind of spatial filter, is useful in measuring a surface velocity of a flow with rapid variations, such as a river flow') or a debris flow z). As well known, the image-velocity sensing is made use of the fact that the center frequency of the output electrical signal of the sensor is propotional to the surface velocity of the flow.1 The modulation of the output signal corresponds to the change of light intensity transmitted by the reticle, on which the focused optical image of the flow-surface is moving. Owing to the random distribution of brightness of the flow-surface, the output signal of the sensor is a stochastic signal. Accordingly, the main subject of this sensing is to extract the mean frequency of the output signal with randomness.

Paper Details

Date Published: 1 January 1987
PDF: 2 pages
Proc. SPIE 0813, Optics and the Information Age, (1 January 1987); doi: 10.1117/12.967154
Show Author Affiliations
Yasumasa Itakura, Shiga University (Japan)
Shin-ichi Taniguchi, Shiga University (Japan)


Published in SPIE Proceedings Vol. 0813:
Optics and the Information Age

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