Light quantity measuring device that can accurately measure quan

Details Light quantity measuring device that can accurately measure quan Light quantity measuring device that can accurately measure quan

1996-09-17

1998-03-24

Font, Frank G.

Optics: measuring and testing

Photometers

Photoelectric

356226, G01J 142, G01J 144

Patent

active

057318719

ABSTRACT:
Disclosed is a light quantity measurement device that can accurately monitor light intensity regardless of the polarized condition of incident light. A light quantity measuring device comprises: a birefringent optical device; transmission means for passing incident light from a light source; and a light-receiving device for receiving an ordinary light beam and an extraordinary light beam from the transmission means. The light-receiving device has at the least two electrically separated light-receiving areas from which currents produced by received light are independently output, and includes first and second variable gain amplification means for amplifying currents, which are produced by received light, from the two electrically separated light-receiving areas, and an addition circuit for adding together those currents that are amplified by the first and the second amplification means.

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