Chopper arrangement for atomic absorption spectrophotometer

Details Chopper arrangement for atomic absorption spectrophotometer Chopper arrangement for atomic absorption spectrophotometer

1977-07-27

1979-07-24

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrophotometer

250233, 350274, 350285, G01J 342, G01J 308

Patent

active

RE0300519

ABSTRACT:
An atomic absorption spectrophotometer incorporating discrimination against "background" absorption, i.e., absorption not caused by the resonant line absorption by the element being measured. The device includes a resonant line emitting source (e.g., a hollow cathode lamp) and a continuous spectrum light source (e.g., a deuterium lamp), a monochromator and a detector system. The improvement comprises a specific chopper arrangement which sequentially causes: (a) the resonant line light from the hollow cathode lamp to go to the sample path, (b) this light to go to the reference path, (c) the continuous spectrum light from the deuterium lamp to go to the reference path, and finally (d) the continuous spectrum light to go to the sample path. By comparing the light intensities during intervals (c) and (d) the effect of the background absorption can be determined and compensated for so as to determine the relationship between (a) and (b) free of the effect of such background absorption. The specific improvement includes a sector mirror and disk-shaped mask which are conjointly rotated in the angularly intersecting paths of the radiation from the cathode lamp and the deuterium lamp.

REFERENCES:
patent: 3175092 (1965-03-01), Leftwich
patent: 3334537 (1967-08-01), Beattie
patent: 3413482 (1968-11-01), Ling
patent: 3542480 (1970-11-01), Ford
patent: 3689158 (1972-09-01), Shifrin
Woodriff et al., Applied Spectroscopy, vol. 24, No. 5, Sep./Oct. 1970, pp. 530-533.
Woodriff et al., Applied Spectroscopy, vol. 27, No. 3, May/Jun. 1973, pp. 181-185.
Dick et al., Applied Spectroscopy, vol. 27, No. 6, Nov./Dec. 1973, pp. 467-470.
Kahn et al., Applied Optics, vol. 2, No. 9, Sep. 1963, pp. 931-936.

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