高帯域フィードバック回路を用いたＳＱＵＩＤ磁束計における高周波ノイズ影響の緩和 [in Japanese] Reduction of Effects of High-Frequency Noise on SQUID Magnetometer Using High-bandwidth Feedback Electronics [in Japanese]
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We report the potential of high-bandwidth feedback electronics to reduce the effects of high-frequency noise on a SQUID magnetometer. We developed a parallel type FLL system that has two feedback loops. One loop acts as a magnetometer for low-frequency magnetic signals (FLL-L). The other reduces high-frequency magnetic noise (FLL-H). The prototype of the parallel FLL system is designed to have a bandwidth of DC to 1 kHz for FLL-L and 40 kHz to 4 MHz for FLL-H. We carried out some experiments to the demonstrate efficacy of the parallel type FLL. The effects of high-frequency noise effects on a SQUID magnetometer were reduced by FLL-H in observation of <i>Φ-V</i> characteristics and measurement of magnetic noise performance.
- Journal of the Magnetics Society of Japan
Journal of the Magnetics Society of Japan 34(3), 444-448, 2010
The Magnetics Society of Japan