Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1982-07-15
1985-04-02
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
422106, 422249, 156601, 73293, G01N 2126
Patent
active
045089701
ABSTRACT:
A sensing system and method for detecting changes in the level of a liquid surface utilizing a source of essentially monochromatic illumination of narrow beam width for directing an incident beam toward a liquid surface at an oblique angle thereto, and thereby providing a reflected beam therefrom. A beam expander is interposed between the illumination source and the liquid source for increasing the narrow beam width of the incident beam to a beam width substantially greater than the wavelength of disturbances in the liquid surface. A converging lens is mounted transverse to and intercepts a portion of the reflected beam from the liquid surface for focusing that portion of the reflected beam to a centrum. A beam detector is positioned adjacent to the centrum for providing an indication of changes in the level of the liquid surface by detecting corresponding changes in a relative position of the centrum. An optical filter can be used to intercept the reflected beam to allow only the frequency of the monochromatic illumination source to pass therethrough in a Czochralski furnace.
REFERENCES:
patent: 3574650 (1971-04-01), House
patent: 3740563 (1973-06-01), Reichard
patent: 3882319 (1975-05-01), Clement et al.
patent: 4036595 (1977-07-01), Lorenzini et al.
patent: 4282184 (1981-08-01), Fiegl et al.
Austin II Ernest
Kubida William J.
Motorola Inc.
Nelms David C.
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