Method and apparatus for the on-line measurement of transmission

Details Method and apparatus for the on-line measurement of transmission Method and apparatus for the on-line measurement of transmission

1986-10-06

1988-11-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356416, G01J 350, G01J 3511

Patent

active

047851708

ABSTRACT:
A method and apparatus for the photometric measurement of the transmission or reflection of radiation on a test specimen or measuring object, especially for the final automatic inspection or quality control, for instance, of vacuum-deposited discs with respect to uniformly of the coating or the like, comprises a photometer with a chopper disc in the ray path and with at least one detector (sensor) and a detector amplifier (measuring signal amplifier). In order to achieve that the measurement can be employed under production conditions in on-line operation on moving measuring objects reliably for a long time, the invention provides that the measuring signals are numerically determined directly at the output of each detector amplifier by a fast analog-to-digital conversion and are subsequently processed further in two stages exclusively digitally by peak value determination, combined with averaging, within at least two chopper periods to form a transmission or reflection measurement value. The absolute value of the light intensity at the detector measured in a preceding chopper period serves as reference for the formation of the quotient in the determination of the transmission or reflection.

REFERENCES:
patent: 3436556 (1969-04-01), McCartney
patent: 3751643 (1973-08-01), Dell et al.
patent: 4132314 (1979-01-01), von Beckman et al.
patent: 4170987 (1979-10-01), Anselmo et al.
patent: 4300689 (1981-11-01), Franklin et al.
patent: 4458323 (1984-07-01), Willis et al.
patent: 4482251 (1984-11-01), Saylor

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