Fiber-optic heterodyne phase-shift easurement of plasma current
| Autor: | P. R. Forman, G. I. Chandler, F. C. Jahoda, K. A. Klare |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Physics
Heterodyne Birefringence Optical fiber business.industry Materials Science (miscellaneous) Physics::Optics Phase detector Industrial and Manufacturing Engineering law.invention symbols.namesake Optics Fiber optic sensor law Faraday effect symbols Heterodyne detection Business and International Management business Rogowski coil |
| Zdroj: | Applied optics. 25(11) |
| ISSN: | 1559-128X |
| Popis: | By combining twisted optical sensing fiber and heterodyne phase detection of circular birefringence we have (a) overcome the distortion problem caused by residual linear birefringence in the Faraday rotation method of measuring enclosed current and (b) used only a single output detector without requiring intensity normalization. Resolution of 400 ampere-turns has been obtained in the hostile electromagnetic environment of a working thermonuclear fusion research device. The fiber was simply wound around the existing machine. The measured values are in excellent agreement with those of the electrical Rogowski coil installed when the machine was built. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|