Optics: measuring and testing – By shade or color – Trichromatic examination
Patent
1991-07-10
1993-07-20
Evans, F. L.
Optics: measuring and testing
By shade or color
Trichromatic examination
362 32, 356407, G01N 2125, F21V 704
Patent
active
052298418
ABSTRACT:
A device (1) for photoelectrically sensing the color of an object (18) includes a plurality of light emitting diodes (4, 6, 8) emitting light in a narrow range of wavelengths and where the light is transmitted through a corresponding fiber optic bundle (10, 12, 14) with a diameter in proportion to the transmission loss of the bundle and in inverse proportion to the emitted light energy of the corresponding light emitting diode and in proportion to the spectral response of a receiving photodiode (24). A receiving section (22) utilizes a PIN type photodiode (24) with an input section (40) that matches the shape of a receiving optical fiber bundle termination (42) where the photodiode (24) converts the reflected light from the object (18) into electrical signals which are then processed by a microprocessor (28) which also controls the activation of the light emitting diodes (4, 6, 8) and outputs a signal indicative of the color of the object (18).
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McClanahan David L.
Taranowski Michael G.
Eaton Corporation
Evans F. L.
Hantis K. P.
Uthoff L. H.
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