Photometer

Details Photometer Photometer

1986-04-25

1988-04-12

Evans, F. L.

Optics: measuring and testing

Photometers

Photoelectric

356219, 356226, 356233, G01J 142

Patent

active

047370297

ABSTRACT:
A photometer is providing including light detecting means for detecting incident light and generating electric signals in response thereto as a measure of the incident light thereon, and optical means for guiding light to the light detecting means from a standard light source in a calibration mode and from an object, a photometric quantity of which is to be measured, in a measurement mode. Control means are adapted to generate calibration control signals for carrying out a calibration mode wherein a photometric quantity value Dstd of the standard light source and a measured value Rstd corresponding to the intensity of the standard light source detected by the light detecting means are stored in a memory, and light measurement control signals for carrying out a measurement mode wherein a photometric quantity value Rm corresponding to the photometric quantity of the object measured by the light detecting means is also stored in memory such that a CPU or similar computing means can communicate with the memory and compute a photometric quantity value R of the object according to the formula

REFERENCES:
patent: 3813172 (1974-05-01), Walker et al.
patent: 3818198 (1974-06-01), Walker et al.
Walker, Applied Optics, vol. 11, No. 9, Sep. 1972, pp. 2060-2068.

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