High critical temperature superconducting quantum interference device magnetometer with feedforward active noise control system for magnetocardiographic measurement in unshielded circumstances

Mizukami, Akifumi; Nishiura, H; Sakuta, Ken; Kobayashi, Tatsuo

doi:10.1016/s0921-4534(03)00778-0

Cited by 8 publications

(1 citation statement)

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“…An ANC system that cancels the noise by generating anti-phase waves of the noise has come into use in the acoustic and vibration fields. Noise reduction by an ANC system is also effective in magnetocardiogram (MCG) measurements using SQUIDs in magnetically unshielded environments [3]. However, these ANC systems treat the lowfrequency region, such as that below about 100 Hz.…”

Section: Introductionmentioning

confidence: 99%

Novel Process for Vertical Double-Gate (DG) Metal-Oxide-Semiconductor Field-Effect-Transistor (MOSFET) Fabrication

Masahara

Matsukawa

Tanoue

et al. 2003

Jpn. J. Appl. Phys.

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It is important to remove large environmental noise in superconducting quantum interference device (SQUID) measurement without magnetic shielding. Active noise control (ANC) is one of the effective methods to reduce environmental noise. Recently, SQUIDs have been used in various applications at high frequencies, such as nuclear quadrupole resonance (NQR). The NQR frequency from explosives is in the range 0.5-5 MHz. In this case, an NQR sensor is exposed to AM radio frequency interference (RFI). The feasibility of the ANC system for RFI that used digital signal processing was studied. Our investigation showed that this digital ANC system can be applied to SQUID measurements for RFI suppression.

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Section: Introductionmentioning

confidence: 99%