Multispectral reflectometer

Details Multispectral reflectometer Multispectral reflectometer

1994-04-20

1996-05-14

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356328, G01J 328

Patent

active

055173020

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 focussed 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.

REFERENCES:
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patent: 4616210 (1986-10-01), Ferber et al.
patent: 4810091 (1989-03-01), Sullivan
patent: 4815849 (1989-03-01), Sullivan
patent: 4836674 (1989-06-01), Lequime et al.
patent: 4886355 (1989-12-01), Keane
patent: 4936684 (1990-06-01), Keane
patent: 4940325 (1990-07-01), Becker-Ross et al.
patent: 4954972 (1990-09-01), Sullivan
patent: 4958928 (1990-09-01), Kuderer
Lerner et al, "Diffraction Gratings Ruled and Holographic-A Review" SPIE vol. 24 1980.

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