Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/582145
Title: Weakly Damped SQUID Gradiometer With Low Crosstalk for Magnetocardiography Measurement
Authors: Kang Yang;Hua Chen;Xiangyan Kong;Li Lu;Ming Li;Ruihu Yang;Xiaoming Xie
subject: superconducting quantum interference device (SQUID) gradiometer|Crosstalk|magnetocardiography (MCG)
Year: 2016
Publisher: IEEE
Abstract: In a multichannel magnetocardiography system, the problem of crosstalk is serious due to mutual inductances between the pickup coils of adjacent channels. In this paper, a superconducting quantum interference device gradiometer module based on weakly damped Josephson junctions with large &#x03B2;<sub>c</sub> (&#x2248;5) is presented. An external feedback design is also adopted to suppress the crosstalk between different channels. With a special superconducting connection between input coil and pickup coil, an axial first-order gradiometer with baseline of 70 mm and diameter of 18 mm is fabricated. Using a direct readout circuit with equivalent flux noise of 1.8 &#x03BC;&#x03A6;<sub>0</sub>/&#x221A;Hz, the flux noise of this gradiometer is measured to be 6.5 &#x03BC;&#x03A6;<sub>0</sub>/&#x221A;Hz in a white noise range, corresponding to a field sensitivity of 0.5 fT/(cm &#x00B7; &#x221A;Hz). The crosstalk rates in external feedback mode and internal feedback mode are both successfully simulated with MAXWELL software. The results by experimental measurements using these gradiometers are in coincidence with the simulated ones; both simulation and experimental results show a substantial suppression of crosstalk in the external feedback design.
URI: http://localhost/handle/Hannan/182501
http://localhost/handle/Hannan/582145
ISSN: 1051-8223
1558-2515
volume: 26
issue: 8
Appears in Collections:2016

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Title: Weakly Damped SQUID Gradiometer With Low Crosstalk for Magnetocardiography Measurement
Authors: Kang Yang;Hua Chen;Xiangyan Kong;Li Lu;Ming Li;Ruihu Yang;Xiaoming Xie
subject: superconducting quantum interference device (SQUID) gradiometer|Crosstalk|magnetocardiography (MCG)
Year: 2016
Publisher: IEEE
Abstract: In a multichannel magnetocardiography system, the problem of crosstalk is serious due to mutual inductances between the pickup coils of adjacent channels. In this paper, a superconducting quantum interference device gradiometer module based on weakly damped Josephson junctions with large &#x03B2;<sub>c</sub> (&#x2248;5) is presented. An external feedback design is also adopted to suppress the crosstalk between different channels. With a special superconducting connection between input coil and pickup coil, an axial first-order gradiometer with baseline of 70 mm and diameter of 18 mm is fabricated. Using a direct readout circuit with equivalent flux noise of 1.8 &#x03BC;&#x03A6;<sub>0</sub>/&#x221A;Hz, the flux noise of this gradiometer is measured to be 6.5 &#x03BC;&#x03A6;<sub>0</sub>/&#x221A;Hz in a white noise range, corresponding to a field sensitivity of 0.5 fT/(cm &#x00B7; &#x221A;Hz). The crosstalk rates in external feedback mode and internal feedback mode are both successfully simulated with MAXWELL software. The results by experimental measurements using these gradiometers are in coincidence with the simulated ones; both simulation and experimental results show a substantial suppression of crosstalk in the external feedback design.
URI: http://localhost/handle/Hannan/182501
http://localhost/handle/Hannan/582145
ISSN: 1051-8223
1558-2515
volume: 26
issue: 8
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7582359.pdf467.68 kBAdobe PDFThumbnail
Preview File
Title: Weakly Damped SQUID Gradiometer With Low Crosstalk for Magnetocardiography Measurement
Authors: Kang Yang;Hua Chen;Xiangyan Kong;Li Lu;Ming Li;Ruihu Yang;Xiaoming Xie
subject: superconducting quantum interference device (SQUID) gradiometer|Crosstalk|magnetocardiography (MCG)
Year: 2016
Publisher: IEEE
Abstract: In a multichannel magnetocardiography system, the problem of crosstalk is serious due to mutual inductances between the pickup coils of adjacent channels. In this paper, a superconducting quantum interference device gradiometer module based on weakly damped Josephson junctions with large &#x03B2;<sub>c</sub> (&#x2248;5) is presented. An external feedback design is also adopted to suppress the crosstalk between different channels. With a special superconducting connection between input coil and pickup coil, an axial first-order gradiometer with baseline of 70 mm and diameter of 18 mm is fabricated. Using a direct readout circuit with equivalent flux noise of 1.8 &#x03BC;&#x03A6;<sub>0</sub>/&#x221A;Hz, the flux noise of this gradiometer is measured to be 6.5 &#x03BC;&#x03A6;<sub>0</sub>/&#x221A;Hz in a white noise range, corresponding to a field sensitivity of 0.5 fT/(cm &#x00B7; &#x221A;Hz). The crosstalk rates in external feedback mode and internal feedback mode are both successfully simulated with MAXWELL software. The results by experimental measurements using these gradiometers are in coincidence with the simulated ones; both simulation and experimental results show a substantial suppression of crosstalk in the external feedback design.
URI: http://localhost/handle/Hannan/182501
http://localhost/handle/Hannan/582145
ISSN: 1051-8223
1558-2515
volume: 26
issue: 8
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7582359.pdf467.68 kBAdobe PDFThumbnail
Preview File