Power control circuit for inductively coupled plasma atomic emis

Details Power control circuit for inductively coupled plasma atomic emis Power control circuit for inductively coupled plasma atomic emis

1990-02-26

1992-10-13

Willis, Davis L.

Optics: measuring and testing

By dispersed light spectroscopy

With sample excitation

G01J 330

Patent

active

051555476

ABSTRACT:
A multiple frequency plasma torch activation circuit includes a system driver circuit with a pair of different frequency sources and a selector switch which allows one of the sources to be coupled to a splitter assembly which applies signals to a pair of independent power amplifiers having their outputs applied to a combiner assembly and to the plasma torch inductor. A detector circuit provides signals to a power control circuit which includes forward and reflected power monitoring and an impedance matching circuit for optimum coupling of the frequencies to the inductive load.

REFERENCES:
patent: 4482246 (1984-11-01), Meyer et al.
patent: 4591267 (1986-05-01), Demers et al.
patent: 4629940 (1986-12-01), Gagne et al.

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