Low pressure discharge tube and atomic absorption spectrophotome

Details Low pressure discharge tube and atomic absorption spectrophotome Low pressure discharge tube and atomic absorption spectrophotome

1993-01-28

1996-10-22

Hantis, K.

Optics: measuring and testing

By dispersed light spectroscopy

With background radiation comparison

356312, G01J 342

Patent

active

055682545

ABSTRACT:
In an atomic absorption spectrophotometer utilizing the direct Zeeman's method, plural lamps are installed in the light source unit in order to enhance the versatility and enable continuous analyses. Accordingly, a plurality of low pressure discharge tubes 14 and hollow cathode lamps 16 in total are mounted on a lamp holder 12 of the light source unit, and by rotating the lamp holder 12, an arbitrary lamp may be positioned at the light source position for measurement. When the low pressure discharge tube 14 is used as the light source, in order to perform background correction by the Zeeman's method, a permanent magnet or an electromagnet 24 for operating a magnetic field on the light source is disposed, and a polarizing unit 26 is disposed on the measurement optical path, so that the direction of polarization of the measurement light to be sent to an atomizing unit 26 is changed over between the atomic absorption measurement mode and the background correction mode.

REFERENCES:
patent: 4032235 (1977-06-01), Kiefer et al.
patent: 4100446 (1978-07-01), Harada et al.
patent: 4140385 (1979-02-01), Shaw et al.
patent: 4377342 (1983-03-01), Koizumi et al.
patent: 4645343 (1987-02-01), Stockdale et al.
patent: 4877997 (1989-10-01), Fein
patent: 4948250 (1990-08-01), Oishi et al.
patent: 5181077 (1993-01-01), Dencks

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