Optics: measuring and testing – By dispersed light spectroscopy – With background radiation comparison
Patent
1976-08-16
1978-12-05
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
With background radiation comparison
313210, 356314, G01J 330
Patent
active
041283368
ABSTRACT:
This invention relates to an apparatus and a method for spectroscopically analyzing substances, by fluorescent or resonant detection. An atomic cloud of a reference element is generated by cathodic sputtering and irradiated with radiation emitted from a substance of unknown composition. Generation of the atomic cloud is ceased and the inherent radiation of the atomic cloud allowed to decay. Any fluorescent or resonant radiation of the atomic cloud is then detected to determine the presence or concentration of the reference element in the unknown substance. Further, the amount of background radiation is detected by determining the amount of radiation extant when the concentration of atoms in the atomic cloud has decreased to substantially zero. The invention also provides an abnormal glow discharge lamp having two or more windows, the lamp being particularly suitable for use with the apparatus. The lamp further has a hollow anode with a transverse planar cathode.
REFERENCES:
patent: 3489942 (1970-01-01), Walsh et al.
patent: 3644045 (1972-02-01), Walsh
Evans F. L.
The South African Inventions Development Corporation
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