Inductively coupled plasma spectrometers and radio-frequency...

Details Inductively coupled plasma spectrometers and radio-frequency... Inductively coupled plasma spectrometers and radio-frequency...

H - Electricity

01

J

H01J 49/26 (2006.01) G01N 21/73 (2006.01) H01J 49/10 (2006.01) H05H 1/46 (2006.01)

Patent

CA 2094116

Abstract of the invention The invention provides methods and apparatus for atomic emission spectroscopy and for mass spectrometry which make use of an inductively coupled radio-frequency plasma torch. A radio-frequency power supply supplies energy to a plasma induction coil via reflectometer means and a matching network. A signal indicative of reflected power generated by the reflectometer is used to set the frequency of the power supply to the resonant frequency of the matching network and plasma induction coil, thereby ensuring the maximum efficiency of power transfer irrespective of the state of the plasma. Preferably a solid state power amplifier is employed in conjunction with a lower power variable frequency oscillator. Means for ensuring proper ignition of the plasma while maintaining the frequency of the power generator within a governmentally specified frequency band are also provided.

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