Device for measuring angular deviation of a light beam by use of

Details Device for measuring angular deviation of a light beam by use of Device for measuring angular deviation of a light beam by use of

1975-06-06

1976-09-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 356128, 356169, G01D 534

Patent

active

039833909

ABSTRACT:
A measuring device includes means for producing an image of a transmitting iffraction grating, means for shifting the image by an amount related to the quantity to be measured, and a receiving diffraction grating for measuring the shift of the image. Each diffraction grating includes a plurality of tracks of increasing pitch, each track of the transmitting grating having a corresponding track on the receiving grating. The device may form a refractometer.

REFERENCES:
patent: 3371335 (1968-02-01), Seewald
patent: 3427463 (1969-02-01), Weyrauch
patent: 3451054 (1969-06-01), Johnson
patent: 3586665 (1971-06-01), Weyrauch
patent: 3728715 (1973-04-01), Shapiro

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