Method of sensing variations in a consistency of a fabric and an

Details Method of sensing variations in a consistency of a fabric and an Method of sensing variations in a consistency of a fabric and an

1993-04-06

1995-02-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

250214RC, 250563, 356430, G01N 2132

Patent

active

053918908

ABSTRACT:
The apparatus has an optical reflecting sensor, an operational amplifier buffer with the electrical input connected to the output of the optical sensor, structure for averaging and delating a signal picked up at the output of the sensor, structure for the differential amplification of the signals on output respectively from the buffer and structure for comparing the signal outputting from the means with a known predetermined signal.

REFERENCES:
patent: 3560751 (1971-02-01), Buettner
patent: 3584963 (1971-06-01), Wisner
patent: 3835332 (1974-09-01), Bridges
patent: 3859537 (1975-01-01), Wolf
patent: 3866054 (1975-02-01), Wolf
patent: 3918815 (1975-11-01), Gadbois
patent: 3942898 (1976-03-01), Anderson
patent: 4011457 (1977-03-01), Wolf
patent: 4054377 (1977-10-01), Gibson
patent: 4253113 (1981-02-01), Decavel et al.
patent: 4349880 (1982-09-01), Southgate et al.

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