Color measuring apparatus with flash lamp color temperature meas

Details Color measuring apparatus with flash lamp color temperature meas Color measuring apparatus with flash lamp color temperature meas

1990-12-21

1992-12-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356405, G01J 350, G01N 2125

Patent

active

051681552

ABSTRACT:
A measuring apparatus includes a flash tube for emitting flash light to a target in a first short period and a second short period, a detector for detecting amounts of light from the target in the flash light of the first short period and the flash light of the second short period, a receiver for receiving the flash light irrespective of the target to detect each reference light amount, an evaluator for evaluating the flash light according to the reference light amounts to generate a compensation signal for a characteristic of the flash light with respect to a characteristic of an ideal light source, and a calculator for calculating a characteristic value of the target under ideal light source according to the target light amount and the compensation signal.

REFERENCES:
patent: 4131367 (1978-12-01), French et al.
patent: 4485336 (1984-11-01), Yoshiyama et al.
patent: 4773761 (1988-09-01), Sugiyama et al.
patent: 4989982 (1991-02-01), Osaki et al.
patent: 5004349 (1991-04-01), Sato et al.

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