Electrical zeroing of light beam

Details Electrical zeroing of light beam Electrical zeroing of light beam

1979-06-25

1981-05-05

Corbin, John K.

Optics: measuring and testing

Refraction testing

Differential

G01N 2141

Patent

active

042655366

ABSTRACT:
Apparatus for measuring deflection of a light beam by sensing the beam with means providing two optical measurements, and providing an electrical output dependent upon the difference between the two measurements, with the instantaneous magnitude of each measurement being dependent upon the instantaneous deflection of the beam and upon the instantaneous intensity of the beam, the apparatus including electrical circuitry for including in the output an offset term dependent upon a scale factor and upon the instantaneous magnitude of at least one of the measurements, thereby making the offset term dependent upon the instantaneous intensity of the light beam, and means for initially zeroing the apparatus by adjusting the scale factor so as to make the output equal to a predetermined base value, whereby changes in the measurements due to changes in light beam intensity are offset by corresponding changes in the offset term, so as to thereby reduce the influence of beam intensity on the output.

REFERENCES:
patent: 3386332 (1968-06-01), Watson
patent: 3450886 (1969-06-01), Lown
patent: 3487069 (1969-12-01), Maselli
patent: 3539263 (1970-11-01), Waters
patent: 3579105 (1971-05-01), Scott
patent: 3787703 (1974-01-01), Topol

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