Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1975-03-26
1977-02-08
Wilbur, Maynard R.
Optics: measuring and testing
Range or remote distance finding
With photodetection
250574, 250577, 356208, 356 1, G01C 308, G01N 2126
Patent
active
040069885
ABSTRACT:
An instrument functioning as either a turbidimeter or as a depth meter for measuring the distance from the instrument to the level of a turbid fluid. A light source provided with an optical system emits a beam of light to the fluid, and the volume or "beam of vision" viewed by a photo-cell likewise provided with an optical system intersects said beam of light. The two beams include a relatively small angle so that a tapered or conical volume of intersection in the fluid is obtained. Thus, the quantity of light scattered or reflected within this volume and reaching the photo-cell is dependent on the turbibity and the position of this level. The light emitted by the light source is modulated at a relatively high frequency. The output of the photo-cell passes through a frequency filter and is, then, indicated or recorded as a measure of turbidity or of depth of said layer.
REFERENCES:
patent: 2324304 (1943-07-01), Katzman
patent: 3170151 (1965-02-01), Roth
patent: 3317730 (1967-05-01), Hilsum
patent: 3412253 (1968-11-01), Marcus
patent: 3549893 (1970-12-01), Gibbs
patent: 3608723 (1971-09-01), Brown
Buczinski S. C.
Wilbur Maynard R.
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