Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1986-09-11
1988-08-23
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
307310, H01J 4014
Patent
active
047663049
ABSTRACT:
A sensitivity calibration circuit for use in an absorption analyzer provided with a check-signal generator for easily checking the sensitivity, includes a temperature compensating circuit for use in an optical system for compensating for a temperature draft due to said optical system and a temperature compensation circuit for use in a sample system for compensating for a temperature draft due to the sample system. The temperature compensation circuit for use in an optical system and the temperature compensation circuit for use in a sample system are separately provided and a switch is provided which is switchable to a measuring state in which both the temperature compensation circuit for use in an optical system and the temperature compensation circuit for use in a sample system are used and is switchable to a checking state in which the temperature compensation circuit for use in a sample system is disconnected so as not to be used but the temperature compensation circuit for use in an optical system is used.
REFERENCES:
patent: 3783300 (1974-01-01), Johnson
patent: 3988682 (1976-10-01), Mikonis
Asano Ichiro
Kihara Nobutaka
Kojima Kennosuke
Horiba Ltd.
Nelms David C.
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