Instrument for determining infrared beam vergence

Details Instrument for determining infrared beam vergence Instrument for determining infrared beam vergence

1977-10-07

1979-09-04

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

356353, G01J 100

Patent

active

041669541

ABSTRACT:
An instrument for determining the vergence of a beam in the infrared spectrum, particularly a laser beam, includes a wedged shear plate of suitable infrared transmissive material; a flat plate detector; parallel, spaced bars or strips of bolometric material, such as bismuth, applied to the plate in a pattern so as to match the "null" interferometric modulation from the wedged shear plate and alternately electrically connected to provide a pair of parallel electrical circuits providing signals for comparison; means for rotating and tilting the detector to provide "null" readout from the compared signals and means for directly measuring the vergence of the beam by a measure of the amount of rotation and tilt required to achieve a "null" readout.

REFERENCES:
patent: 3829219 (1974-08-01), Wyant

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