Ambient light suppression for reflectance photometers

Details Ambient light suppression for reflectance photometers Ambient light suppression for reflectance photometers

G - Physics

01

J

G01J 1/08 (2006.01) G01N 21/25 (2006.01) G01N 21/86 (2006.01)

Patent

CA 2077296

ABSTRACT OF THE DISCLOSURE A spectral cover for a reflectance photometer is disclosed in which the spectral cover is designed to cover the readhead area of the reflectance photometer and block the transmission of light in a wavelength range of at least 60 to no more than 200 nanometers centered about the detection wavelength while permitting light of other wavelengths to be transmitted. The invention permits the readhead cover to be permanently or semipermanently positioned on the reflectance photometer. Since a user is able to see through the spectral cover it is possible to position a test device correctly and quickly over the readhead of the reflectance photometer. Signal noise levels due to ambient light are substantially eliminated by the invention. MS-1666

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