Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1991-08-29
1994-10-11
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
356316, G01J 330, G01N 2172
Patent
active
053552148
ABSTRACT:
A method and means for accurately regulating the rate of flow of supply gas to the burner or torch of a spectrometer. The flow rate is controlled by a valve having a closure member which is movable between a position at which it provides maximum obstruction to gas flow, and a position at which it provides minimum such obstruction. The closure member movement is controlled by a pulsed electrical signal so that the closure member moves rapidly and repeatedly between each of the two positions. Gas flow rate through the valve is therefore dependent upon the aggregate of the times the closure member spends in either of the two positions referred to, and that flow rate is changed by varying the frequency and/or pulse duration of the pulsed signal.
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Colaneri, "Solenoid Valve Basics," Instruments and Control Systems, vol. 52, #8, Aug. 1979.
Berkowitz Edward H.
Fisher Gerald M.
Hantis K. P.
McGraw Vincent P.
Varian Associates Inc.
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