Optical filter for an optical measurement instrument

Details Optical filter for an optical measurement instrument Optical filter for an optical measurement instrument

1991-05-02

1992-09-22

Evans, F. L.

Optics: measuring and testing

By shade or color

Tristimulus examination

356419, 359890, 250226, G01N 2125, G01J 351

Patent

active

051491826

ABSTRACT:
An improved optical filter for use in an optical measurement instrument has a corrective optical glass filter with a negative deviation in the range of 470 nm added to the optical filter to offset a positive deviation in the range of 470 nm in an amber or blue glass filter used in the optical filter. The improved optical filter in interposed between a photoelectric element in the optical measurement instrument and the source of electromagnetic radiation. The photoelectric device converts the electromagnetic radiation to an electrical signal which is processed and displayed. In one embodiment of the invention the optical filter has a spectral response matching that of the average human eye and in a further embodiment the optical filter has an approximate equal response over a spectral range from ultraviolet to infrared.

REFERENCES:
patent: 3812350 (1974-05-01), Szabo et al.
patent: 4357105 (1982-11-01), Loretz
patent: 4988203 (1991-01-01), Vriens et al.

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