Double polarized light beam spectrophotometer of light source mo

Details Double polarized light beam spectrophotometer of light source mo Double polarized light beam spectrophotometer of light source mo

1984-04-27

1987-02-24

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

With background radiation comparison

356312, 356323, G01J 342, G01N 2174

Patent

active

046453415

ABSTRACT:
A double polarized light beam spectrophotometer of a light-source modulation type. A modulated light beam emitted by a light source is conducted through specimen atom vapor generated by a graphite atomizer. Wavelength of light undergone atom absorption is selected and spatially separated into a pair of linearly polarized light beams perpendicular to each other. The pair of the linearly polarized light beams separated are alternately passed through a chopper and received by a photoelectric conversion device to be converted into electric signals which are utilized for determining atomic absorption of the specimen. The phase of modulation of light radiated from the light source is synchronized with phase of a current supplied to the graphite atomizer for heating thereof and the switching timing of the chopper.

REFERENCES:
patent: 3676004 (1972-07-01), Prugger et al.
patent: 4165937 (1979-08-01), Murayama et al.
patent: 4340307 (1982-07-01), Diamond et al.
patent: 4341470 (1982-07-01), Parker et al.
patent: 4377342 (1983-03-01), Koizumi et al.
Stephens, Talanta, vol. 25, No. 8, pp. 435-440, 1978.
Ito, Anal. Chem., vol. 52, No. 11, pp. 1592-1595, 1980.
Koizumi et al., Anal. Chem., vol. 49, No. 8, pp. 1106-1112, 1977.

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