Environmental MHz Noise Reduction for SQUID Application

Sakuta, Ken; Araya, Takao; Kitamura, Yuri; Kamishiro, M.; Itozaki, Hideo

doi:10.1109/tasc.2007.897867

Cited by 2 publications

(4 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The amount of the reduction is about 46 dB. In our previous work [6], the noise reduction level of the analog ANC system using the phase and amplitude control unit, which had to be adjusted manually, was about 54 dB. The reasons for this smaller reduction ratio are high environmental noise level and that the ADF algorithm or the implementation of the algorithm is not optimized.…”

Section: Resultsmentioning

confidence: 95%

See 1 more Smart Citation

Radio frequency interference noise reduction using a field programmable gate array for SQUID applications

Sakuta

Narita

Itozaki

2007

Supercond. Sci. Technol.

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 95%

“…In our previous work [5,6], an ANC system with phase and amplitude control circuitry suppressed megahertz range sinusoidal waves effectively. This ANC system showed an effective reduction against AM radio broadcasting interference (RFI).…”

Section: Introductionmentioning

confidence: 99%

Radio frequency interference noise reduction using a field programmable gate array for SQUID applications

Sakuta

Narita

Itozaki

2007

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…However, resultant from the tests, a false alarm rate of circa 0.1 mine per square meter explored was reported with “100%” mine detection efficiency. Further multiple channel approaches for RFI mitigation in NQR applications can be found in the literature [8,9,10]. All of these studies show good results.…”

Section: Introductionmentioning

confidence: 99%

“…All of these studies show good results. For instance, in static trials in the literature [8] (the detector moved across the field in [7]), interference suppression by 54%was achieved.…”

Section: Introductionmentioning

confidence: 99%

Decision Tree Pattern Recognition Model for Radio Frequency Interference Suppression in NQR Experiments

Ibrahim

Parrish

Brown

et al. 2019

Sensors

View full text Add to dashboard Cite

Radio frequency interference places a major limitation on the in-situ use of unshielded nuclear quadrupole or nuclear magnetic resonance methods in industrial environments for quality control and assurance applications. In this work, we take the detection of contraband in an airport security-type application that is subject to burst mode radio frequency interference as a test case. We show that a machine learning decision tree model is ideally suited to the automated identification of interference bursts, and can be used in support of automated interference suppression algorithms. The usefulness of the data processed additionally by the new algorithm compared to traditional processing is shown in a receiver operating characteristic (ROC) analysis of a validation trial designed to mimic a security contraband detection application. The results show a highly significant increase in the area under the ROC curve from 0.580 to 0.906 for the proper identification of recovered data distorted by interfering bursts.

show abstract

Environmental MHz Noise Reduction for SQUID Application

Cited by 2 publications

References 5 publications

Radio frequency interference noise reduction using a field programmable gate array for SQUID applications

Radio frequency interference noise reduction using a field programmable gate array for SQUID applications

Decision Tree Pattern Recognition Model for Radio Frequency Interference Suppression in NQR Experiments

Contact Info

Product

Resources

About