Far-Infrared Interferometry And Faraday Rotation For Thermal Plasmas

Sidney A. Self

doi:10.1117/12.939779

10 September 1987 Far-Infrared Interferometry And Faraday Rotation For Thermal Plasmas

Sidney A. Self

Proceedings Volume 0746, Industrial Laser Interferometry; (1987) https://doi.org/10.1117/12.939779
Event: OE LASE'87 and EO Imaging Symposium, 1987, Los Angeles, CA, United States

Abstract

Interferornetric methods for determining the electron concentration Ne in thermal plasmas are reviewed. Such methods depend on measuring the contribution to the refractive index of the free electrons for a probing em wave of suitable frequency. This contribution depends on the ratio of the wave frequency f to the plasma frequency fp ∞ Ne 1/2 and in practice (f/fp) must be significantly greater than unity. For thermaill plasmis, of interest for various devices and processes, probe frequencies in the range 10¹¹ to 10¹³ Hz are required, corresponding to wavelengths in the millimeter to mid infrared regions, which are accessible with CO2 laser-pumped gas lasers. The technique may be implemented using a two-path laser interferometer or, in the case of a strongly magnetized plasma, by using Faraday rotation of the plane of polarization. Experiments are detailed in which both these methods were used to measure Ne in seeded combustion plasmas in a mag-netohydrodynamic generator.

Citation Download Citation

Sidney A. Self "Far-Infrared Interferometry And Faraday Rotation For Thermal Plasmas", Proc. SPIE 0746, Industrial Laser Interferometry, (10 September 1987); https://doi.org/10.1117/12.939779

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KEYWORDS

Plasmas

Refractive index

Interferometry

Combustion

Interferometers

Temperature metrology

Neon

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