Reflectometer for a roasting system

Details Reflectometer for a roasting system Reflectometer for a roasting system

1999-04-29

2000-08-15

Font, Frank G.

Optics: measuring and testing

By shade or color

With color determination by light intensity comparison

250226, G01J 346, G01J 350

Patent

active

061044946

ABSTRACT:
A reflectometer for use with a roasting system includes a laser diode, a lens and a photodetector. The laser diode emits a laser beam having a wavelength corresponding to the maximum actinic response of the items being roasted. The laser beam is reflected off a mirror into a collecting volume of the items being roasted. The items being roasted then reflect light through the lens and to the photodetector. The system also includes a cross polarizer and a narrow-band filter between the lens and photodetector in order to filter undesirable reflected light. The collecting volume and the detector are within the searchlight cone defined by the lens and its focal point such that the reflected light from the collecting volume has a constant illumination.

REFERENCES:
patent: 3867039 (1975-02-01), Nelson
patent: 4110485 (1978-08-01), Grubbs et al.
patent: 4707138 (1987-11-01), Coatney
patent: 4849625 (1989-07-01), Porzi
patent: 5034609 (1991-07-01), Satake et al.
patent: 5502559 (1996-03-01), Powell et al.
patent: 5724882 (1998-03-01), Gallas et al.

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