Method and apparatus for headbox jet velocity measurement

Details Method and apparatus for headbox jet velocity measurement Method and apparatus for headbox jet velocity measurement

1988-04-05

1989-08-15

Tarcza, Thomas H.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

7386106, 250239, G01P 336, G01P 522

Patent

active

048568953

ABSTRACT:
The velocity of a liquid jet, such as the headbox jet of a paper making machine, is measured by cross-correlation of a.c. signal components produced by a pair of light beams received by a pair of photodiodes. The light is supplied by a single source, an incandescent lamp, and is guided by a pair of bifurcated fiber optics mounted above the jet and spaced apart in the flow direction. The a.c. components are filtered to remove flow frequencies, amplified and then analyzed in a spectrum analyzer.

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S. Baudvin et al., "A Paper Sheet Contactless Linear Speed Measurement," IFAC PRP, vol. 4, Automation, 1980, pp. 1-13.
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Bulletin B218.80a, "Eur-Control Optical Flow Transmitter," Eur. Control U.S.A., Inc., Decatur, Ga.
Bolon et al. "A Contribution to the Study of the Stock Jet as It Leaves the Flowbox".

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