Transparency transmissivity measurement device

Details Transparency transmissivity measurement device Transparency transmissivity measurement device

1988-11-18

1990-08-07

McGraw, Vincent P.

Optics: measuring and testing

For light transmission or absorption

356443, G01N 2159, G01N 2184

Patent

active

049462822

ABSTRACT:
A device for measuring optical transmissivity of a transparency is described which comprises a diffuse light source (Lambertian diffuser) of controllable substantially constant luminance and preselected light emitting surface area for placement near a first side of a transparency for transmitting diffuse light along an optical axis through the transparency, a housing having a wall defining an aperture for placement near the second side of the transparency opposite the diffuse light source, and a detector in the form of a photo diode, cadmium sulfide cell or the like disposed within the housing and coaxial with and spaced a preselected distance from the aperture, the aperture being selected in size to expose all of the effective light detection surface area of said detector to the light emitting surface area of the diffuse light source.

REFERENCES:
patent: 1016753 (1912-02-01), Leumann
patent: 1967583 (1934-07-01), McFarlane et al.
patent: 3711701 (1973-01-01), Squyres
patent: 3999863 (1976-12-01), Schoneman
patent: 4003662 (1977-01-01), Retzer et al.
patent: 4071299 (1978-01-01), Amano et al.
patent: 4094609 (1978-06-01), Fujii et al.
patent: 4188533 (1980-02-01), Ashenfelter et al.
patent: 4623258 (1986-11-01), Task et al.

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