Multispectral reflectometer

Details Multispectral reflectometer Multispectral reflectometer

1993-01-04

1993-11-16

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356334, G01J 318, G01J 304

Patent

active

052628400

ABSTRACT:
A reflectometer for measuring absorption of light in selected regions of the light spectrum by a diffuse reflector. The reflectometer is adapted to precisely measure absorption resulting from the constituents present in body fluids. The sample to be measured is illuminated by a focused light source at an angle of 45.degree. to its surface. The light diffusely reflected about the normal to the sample falls on a small round bundle of optical fibers at the opposite end of the bundle, the fibers are arranged into a narrow rectangle. This rectangle forms the entrance slit for a concave holographic diffraction grating. The grating forms images of this entrance slit spectrally separated over a flat field suitable for recording the spectrum on film or on an array of discrete detectors.

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Clinical Chemistry, vol. 34, No. 11, Nov. 1988, pp. 2367-2370; W. E. Neeley: "A reflectance photometer with a Square photodiode array detector for use on multilayer dry-film slides".
J. M. Lerner, "Diffraction Gratings Ruled and Holographic--A Review," SPIE vol. 240, 1980.

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