Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1976-12-16
1979-07-03
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
G01J 330
Patent
active
041598768
ABSTRACT:
Chemical analysis apparatus such as a spectrophotometer including an atomizer for receiving a sample to be analyzed and being heated by resistance heating. Control means being provided to vary the voltage across the atomizer, and consequently its temperature, and a feedback circuit is connected between the atomizer and the control means and includes components which are operable to generate an electrical analogue which at least approximates the heating response characteristics of the atomizer. The feedback circuit functions as a negative feedback loop so as to modify the power input to the atomizer by application of the aforementioned electrical analogue, and in that way substantially compensates for the heating response characteristics of the atomizer such that the temperature time profile of the atomizer follows a predictable path.
REFERENCES:
lundgren et al., Analytical Chemistry, vol. 46, No. 8, Jul. 1974, pp. 1028-1031.
Montaser et al., Analytical Chemistry, vol. 47, No. 1, Jan., 1975, pp. 38-45.
Culver et al., American Laboratory, vol. 8, No. 3, Mar. 1976, pp. 59-62, 64 and 67-69.
Egan Edward G.
Jackson Ian S.
Cole Stanley Z.
Evans F. L.
Fisher Gerald M.
Morrissey John J.
Varian Techtron Proprietary Limited
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