Light transmission measurement method

Details Light transmission measurement method Light transmission measurement method

1979-03-09

1981-09-15

McGraw, Vincent P.

Optics: measuring and testing

By monitoring of webs or thread

250571, 356434, G01N 2184, G01N 2186

Patent

active

042894069

ABSTRACT:
A method is provided for measuring light transmission through a continuous sheet having an aperture pattern thereon. A light source is positioned on one side of the sheet and a light sensor is positioned on the opposite side of the sheet. The improvement comprises bypassing a portion of the light from the light source around the sheet to the sensor. The bypassed light is used to update the calibration of the measurements.

REFERENCES:
patent: 3690772 (1972-09-01), Endl
patent: 3790289 (1974-02-01), Schmidt
patent: 3808067 (1974-04-01), Brown
patent: 4099607 (1978-07-01), Brennan et al.
patent: 4126510 (1978-11-01), Moscony et al.

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