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Updated: Jul 2, 2026

How to Ignite an Atmospheric Pressure Microwave Plasma Torch without Any Additional Igniters

How to Ignite an Atmospheric Pressure Microwave Plasma Torch without Any Additional Igniters

Published on: April 16, 2015

Simple automatic initiator for microwave induced plasmas.

H R Crowe¹, I B Goldberg

¹Science Center, Rockwell International, Thousand Oaks, California 91360.

The Review of Scientific Instruments

|August 1, 1978

Summary

A simple circuit maintains radio-frequency or microwave induced plasma continuity by monitoring reflected power. If plasma extinguishes, a high-voltage pulse is applied, ensuring stable plasma for various analytical techniques.

Area of Science:

Plasma Physics
Analytical Chemistry
Spectroscopy

Background:

Maintaining stable plasma is crucial for many analytical techniques.
Radio-frequency (RF) and microwave-induced plasmas are widely used in scientific applications.
Plasma extinction can disrupt experiments and lead to inaccurate results.

Purpose of the Study:

To describe a simple circuit for maintaining plasma continuity.
To enable stable operation of RF and microwave-induced plasmas.
To improve the reliability of plasma-based analytical methods.

Main Methods:

Monitoring reflected microwave power from the plasma discharge.
Detecting an increase in reflected power, indicating plasma extinction.
Applying a high-voltage pulse to a coil around the discharge region to re-ignite the plasma.

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An Atmospheric Pressure Plasma Setup to Investigate the Reactive Species Formation

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Main Results:

The circuit effectively maintains plasma continuity.
Adjustable parameters include pulse repetition rate, voltage, and reflected power threshold.
Demonstrated applicability to resonance fluorescence, atomic absorption/emission, and kinetic determinations.

Conclusions:

The described circuit provides a simple and effective solution for plasma stabilization.
This technology enhances the reliability of plasma-dependent analytical measurements.
The circuit's versatility makes it suitable for diverse spectroscopic and kinetic analyses.