Photoelectric measurement of moving filamentary material

Details Photoelectric measurement of moving filamentary material Photoelectric measurement of moving filamentary material

1982-02-09

1984-03-13

Rosenberger, R. A.

Optics: measuring and testing

By configuration comparison

With photosensitive film or plate

250214B, 250560, 340677, 356238, 356429, G01B 1110

Patent

active

044364270

ABSTRACT:
A light source is energized by pulses controlled by a frequency standard taken from a resonant circuit output. The resonant circuit acts as a narrow-band filter and comprises the capacitance of a photoresponsive receiver and an associated inductor so that a desired filter frequency is obtained. The accurate coincidence of the light source pulse frequency and the resonant circuit acting as a narrow-band output filter permits optical interference acting on the measuring apparatus to be effectively suppressed.

REFERENCES:
patent: 3340400 (1967-09-01), Quittner
patent: 3453053 (1969-07-01), Gunn-Russell
patent: 3842257 (1974-10-01), Kohler
patent: 3907440 (1975-09-01), Eichenberger et al.
patent: 4091368 (1978-05-01), Schwartz

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