Atomic absorption spectrophotometer

Details Atomic absorption spectrophotometer Atomic absorption spectrophotometer

1984-06-18

1990-08-14

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

With background radiation comparison

G01J 342

Patent

active

049482505

ABSTRACT:
In atomic absorption spectrophotometers such as Zeeman atomic absorption spectrophotometer, the present invention is characterized in that the correction timing of background absorption in sample light is made to coincide with that of reference light so as to improve the accuracy of the output signals of the spectrophotometer. To accomplish this object, the present invention constitutes a calculation processing unit for storing and calculating signals by means for separating one signal consisting of sample signals and reference signals applied thereto from amplification means for amplifiying photoelectrically converted signals into sample and reference signals, and storing them, means for calculating respectively the mean values of two time adjacent signals of one of the sample and reference signals to prepare a signal of the mean values, and means for calculating the difference of the logarithmic converted values of the signals of the other of the sample and reference signals and those of the signals of the signal of the mean values at the same points of time, and obtaining correction signals of background absorption.

REFERENCES:
patent: 4299485 (1981-11-01), Barlow et al.
patent: 4357673 (1982-11-01), Willis et al.
Koizumi et al., Analytical Chemistry, vol. 49, No. 8, Jul. 1977, pp. 1106-1112.

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