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

G - Physics

01

P

354/31, 73/58

G01P 5/22 (2006.01) G01N 21/85 (2006.01) G01P 3/80 (2006.01) G01P 5/20 (2006.01)

Patent

CA 1241852

ABSTRACT OF THE DISCLOSURE 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 low frequencies, amplified and then analyzed in a spectrum analyzer.

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