Method of and apparatus for ascertaining the density of a stream

Details Method of and apparatus for ascertaining the density of a stream Method of and apparatus for ascertaining the density of a stream

1990-05-17

1992-04-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356239, 209588, G01N 904

Patent

active

051030861

ABSTRACT:
The density of a trimmed stream of tobacco particles on a radiation-permeable conveyor is ascertained by directing a first beam of infrared light against the trimmed stream so that the light must pass through the stream and through the conveyor prior to reaching a detector which transmits to an evaluating circuit signals denoting the density of the trimmed stream. Such signals are corrected, when necessary, by signals which are generated by a second detector serving to monitor the intensity of infrared light which has passed only through the conveyor, and the corrected signals are used to regulate the operation of a trimming device which converts an untrimmed stream into the trimmed stream. Signals from the second detector indicate the extent of permeability changes of the conveyor as a result of accumulation of solid and/or liquid substances in or on the conveyor, and such signals can further serve to warn the operators that the conveyor is damaged and/or to modify the intensity of light which is caused to pass through the stream and through the conveyor and/or to modify the intensity of light which passes only through the conveyor.

REFERENCES:
patent: 3030966 (1957-12-01), Lanore
patent: 4147930 (1979-04-01), Browne et al.
patent: 4151410 (1979-04-01), McMillan et al.
patent: 4572666 (1986-02-01), Satake
patent: 4576482 (1986-03-01), Pryor
patent: 4729468 (1988-03-01), Pinck
patent: 4875776 (1989-10-01), Pryor
patent: 4889139 (1989-12-01), Heitmann

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