Apparatus for the photo-optical measurement of the absorption be

Details Apparatus for the photo-optical measurement of the absorption be Apparatus for the photo-optical measurement of the absorption be

1977-03-28

1979-05-01

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250341, 250351, 250514, G01J 100, G21F 504

Patent

active

041525949

ABSTRACT:
An apparatus for the photo-optical measurement of the absorption behavior of solid, liquid and gaseous media. A measurement light beam from an optical radiation source is made intermittent by a rotating chopper comprising a rotatable metal wheel. The chopper frequency is maintained constant by regulation of the speed of the metal wheel by two alternating-current magnets inducing eddy currents to slow or speed up the wheel. The actual speed of the wheel is detected and compared with a reference speed and the magnitude of the excitation currents is adjusted on the basis of the rotatory speed difference to effect the regulation of the speed of the chopper.

REFERENCES:
patent: 1838146 (1931-12-01), Klopsteg
patent: 3863071 (1975-01-01), Campanella
patent: 4048500 (1977-09-01), Moore

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