Measurement of Coil Deformation in Pulsed High Magnetic Field Using a Fiber Optic Interferometer

A. Khlybov, A. Belov, A. Nenashev, G. Shneerson, Sergei Shimanskiy
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Abstract

Measurement of coil deformation in pulsed high magnetic field is an important problem in high power electrical engineering. Small deformations (in the micrometer region) need to be measured with high accuracy using a small footprint (about 1 cm or less) sensor. Unfortunately, high coil current (from several tens of kA and more) and corresponding electromagnetic field create strong interference that makes it nearly impossible to use many types of electronic sensors. Fiber optic deformation sensors are sensitive and not affected by electromagnetic fields and thus are a very attractive solution. Various measurement techniques and their benefits and limitations are discussed. An interferometer using a 3x3 coupler was built, calibrated and used in experiments. The results of experiments with a fiber optic interferometer and a copper coil with currents up to 25 kA are presented.
用光纤干涉仪测量脉冲强磁场中的线圈变形
脉冲强磁场下线圈变形的测量是大功率电气工程中的一个重要问题。需要使用小尺寸(约1厘米或更小)传感器以高精度测量微小变形(在微米区域)。不幸的是,高线圈电流(从几十kA甚至更多)和相应的电磁场产生强烈的干扰,使得几乎不可能使用许多类型的电子传感器。光纤变形传感器灵敏度高,不受电磁场影响,因此是一个非常有吸引力的解决方案。讨论了各种测量技术及其优缺点。采用3 × 3耦合器制作了干涉仪,进行了标定,并用于实验。本文介绍了用光纤干涉仪和电流高达25 kA的铜线圈进行的实验结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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