Flameless atomization

Details Flameless atomization Flameless atomization

1976-12-16

1979-01-16

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

With sample excitation

G01J 330

Patent

active

041346858

ABSTRACT:
Chemical analysis apparatus such as a spectrophotometer, having a carbon rod or other non-flame atomizer which is adapted to be heated by electrical resistance heating. The atomizer is included in a heater circuit, and a particular relationship exists between the electrical resistance of the atomizer and the electrical resistance of the remainder of that circuit. That relationship is such that variations in the atomizer resistance as may occur over a period of use, do not substantially affect power dissipation in the atomizer during heating. Ideally, the two resistance values are equal, but variations from the ideal are satisfactory in practice. A feed-back circuit is arranged to maintain a substantially constant voltage across the heater circuit, and that is achieved by comparing the applied voltage with a reference voltage and modifying the applied voltage as necessary to maintain a predetermined relationship between the two.

REFERENCES:
culver et al., American Laboratory, vol. 8, No. 3, Mar. 1976, pp. 59-62, 64 and 66-69.

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