Inverse fourth power photometric calibrator

Details Inverse fourth power photometric calibrator Inverse fourth power photometric calibrator

1978-01-10

1979-05-01

Hille, Rolf G.

Optics: measuring and testing

Photometers

356243, 250252, 250227, G01J 100, G02B 514

Patent

active

041520742

ABSTRACT:
A photometric calibrator is disclosed wherein a known and continuously vable amount of light flux received at a detector is linearly proportional to the inverse fourth power of the optical path length between the detector and a primary, quasi-point source of the light flux. The calibrator includes a secondary, quasi-point light flux source wherein the total flux emitted thereby is proportional to the flux received thereby over a quasi-point detecting area located at some distance, d, from the primary source. The detector is located at an equal distance d from the secondary source.

REFERENCES:
patent: 736064 (1903-08-01), Burnett
patent: 3344703 (1967-10-01), Milton

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