Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1989-11-03
1991-06-11
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
21912149, 31511121, G01N 2173
Patent
active
050227564
ABSTRACT:
A method and apparatus for controlling measurement repeatability in spectrochemical analysis which analysis utilizes a plasma source is shown to include a plasma generator for providing energy to the plasma source to sustain plasma, a sensor for sensing the operating temperature of the plasma generator and a temperature controller for controlling the operating temperature of the plasma generator in response to the temperature sensed by the sensor. The temperature controller controls the operating temperature of the plasma generator either within a temperature range, such as between 100.degree. C. or at a set point temperature. In the case of a magnetron having heat conductive fins as the plasma generator, the sensor senses the temperature of at least one of said fins and the temperature controller includes a fan directed to move air across the fins and a speed controller for controlling the speed of the fan in response to the sensed temperature of the fins.
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patent: 4654504 (1987-03-01), Sullivan et al.
patent: 4659899 (1987-04-01), Welkie et al.
patent: 4776690 (1988-10-01), Quimby
Evans F. L.
Hewlett--Packard Company
Schuette Richard F.
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