Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-11-29
1989-07-18
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
219502, 356425, G01J 350, H05B 102
Patent
active
048496251
ABSTRACT:
The device makes use of at least one photoemitter and at least one photodetector, operating in conjunction with the inspection glass of the oven against which the coffee beans tumble continually throughout the roast; the photodetector is located remotely, and receives its light input through an optic fiber link the transmitting end of which is supported, together with the photoemitters, by a block fitted to the discharge hatch of the oven directly over the inspection glass and invested with a coolant in order to maintain the temperature at the monitoring location within the preferred operating limits specified for the photoemitters and the optic fiber material.
REFERENCES:
patent: 2436575 (1948-02-01), Johnson
patent: 2572678 (1951-10-01), Torres
patent: 3576646 (1971-04-01), Alwood
patent: 3606829 (1971-09-01), Alwood
patent: 3735143 (1973-05-01), Langford
patent: 4057352 (1977-11-01), Babb
patent: 4271603 (1981-06-01), Moore, III
patent: 4325191 (1982-04-01), Kumagai et al.
patent: 4350442 (1982-09-01), Arild et al.
patent: 4642906 (1987-02-01), Kaatze et al.
Allen Stephone B.
Nelms David C.
Officine Vittoria S.p.A.
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