Development of a Laser Probe for Electron Temperature
GENERAL ELECTRIC CO PHILADELPHIA PA RE-ENTRY SYSTEMS DEPT
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Thomson scattering radiation has been measured in terms of electron concentration and temperature in a free jet facility and a shock tunnel using a 12 joule, Q-switched ruby laser. A detector system is described which attenuates the primary ruby wavelength by 10 thousand, discriminates between orthogonal polarization states, analyzes the radiation spectrally and provides a measure of radiation background. The scattering volume was approximately .003 cc for the jet facility and approximately .02 cc cm3 for the shock tunnel. A temperature range of 3000 to 8000K and an electron concentration range 5 x 10 to the 14th power to 5 x 10 to the 15th powercc was measured. A unique method of measuring electron temperature is described using a passive system utilizing a retardation plate.
- Lasers and Masers
- Test Facilities, Equipment and Methods