Measuring head

Details Measuring head Measuring head

1976-12-27

1978-03-14

Corbin, John K.

Optics: measuring and testing

Photometers

G01N 2148

Patent

active

040788580

ABSTRACT:
A head for measuring light diffusely reflected from a surface, the head having an optical projection system for projecting light onto a surface to be measured, and another optical system for collecting the light diffusely reflected from that surface and imaging it on a photodiode. The collecting optics comprise a spherical annular mirror coaxially aligned with an annular transparent planar member which has an annular plane mirror mounted underneath it, the projected light passing through the apertures in the annular mirror, the planar member, and the annular planar mirror. The light diffusely reflected from the surface to be measured passes through the planar member onto the spherical mirror which reflects it back through the member onto the planar mirror which in turn reflects it back through the planar member onto reducing optics which images the reflected light onto the photo-diode.

REFERENCES:
patent: 3246561 (1966-04-01), Sweet
patent: 3774039 (1973-11-01), Price
patent: 3996476 (1976-12-01), Lazzara

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