Radiant energy – Calibration or standardization methods
Patent
1985-05-30
1987-06-16
Howell, Janice A.
Radiant energy
Calibration or standardization methods
250339, 250343, 250345, 250349, G01D 1800, G01N 2161
Patent
active
046738126
ABSTRACT:
An amplifying circuit for amplifying an output from a measurement wavelength detector consists of a preamplifier and a measurement signal amplifier provided at an output of said preamplifier. The measurement signal amplifier is provided with an input-resistance and a feed-back resistance, a variable resistance connected in series to a normally open switch, the series combination being connected in parallel to the feed-back resistance so that the gain of the measurement signal amplifier may be variable.
REFERENCES:
patent: 3562524 (1971-02-01), Moore et al.
patent: 4040747 (1977-08-01), Webster
patent: 4346296 (1982-08-01), Passaro et al.
patent: 4480190 (1984-10-01), Burough et al.
patent: 4525069 (1985-06-01), Tanaka et al.
"Messen, Steuern und Regeln in der Chemischen Technik", Herausgegeben von, J. Hengstenberg et al., Dritte, neubearbeitete Auflage, New York, 1980, pp. 31-32.
Hannaher Constantine
Horiba Ltd.
Howell Janice A.
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