A synthetic optically pumped gradiometer for magnetocardiography measurements

doi:10.1088/1674-1056/ab7801

中国物理B ›› 2020, Vol. 29 ›› Issue (4): 40702-040702.doi: 10.1088/1674-1056/ab7801

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇下一篇

A synthetic optically pumped gradiometer for magnetocardiography measurements

Shu-Lin Zhang(张树林), Ning Cao(曹宁)

1 Joint Laboratory of Bioimaging Technology and Applications, CAS-SIMIT&MEDI, Shanghai 201899, China;
2 State Key Laboratory of Functional Materials for Informatics, Institute of Microsystem and Information Technology(SIMIT), Chinese Academy of Sciences(CAS), Shanghai 200050, China;
3 Centre for Excellence in Superconducting Electronics, Chinese Academy of Sciences, Shanghai 200050, China;
4 Shanghai Medi Instruments Ltd., Shanghai 201899, China

收稿日期:2019-12-13 修回日期:2020-02-08 出版日期:2020-04-05 发布日期:2020-04-05
通讯作者: Shu-Lin Zhang E-mail:zhangsl@mail.sim.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 61701486).

A synthetic optically pumped gradiometer for magnetocardiography measurements

Shu-Lin Zhang(张树林)^1,2,3, Ning Cao(曹宁)^1,4

1 Joint Laboratory of Bioimaging Technology and Applications, CAS-SIMIT&MEDI, Shanghai 201899, China;
2 State Key Laboratory of Functional Materials for Informatics, Institute of Microsystem and Information Technology(SIMIT), Chinese Academy of Sciences(CAS), Shanghai 200050, China;
3 Centre for Excellence in Superconducting Electronics, Chinese Academy of Sciences, Shanghai 200050, China;
4 Shanghai Medi Instruments Ltd., Shanghai 201899, China

Received:2019-12-13 Revised:2020-02-08 Online:2020-04-05 Published:2020-04-05
Contact: Shu-Lin Zhang E-mail:zhangsl@mail.sim.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 61701486).

摘要/Abstract

摘要： Magnetocardiography (MCG) measurement is important for investigating the cardiac biological activities. Traditionally, the extremely weak MCG signal was detected by using superconducting quantum interference devices (SQUIDs). As a room-temperature magnetic-field sensor, optically pumped magnetometer (OPM) has shown to have comparable sensitivity to that of SQUIDs, which is very suitable for biomagnetic measurements. In this paper, a synthetic gradiometer was constructed by using two OPMs under spin-exchange relaxation-free (SERF) conditions within a moderate magnetically shielded room (MSR). The magnetic noise of the OPM was measured to less than 70 fT/Hz^1/2. Under a baseline of 100 mm, noise cancellation of about 30 dB was achieved. MCG was successfully measured with a signal to noise ratio (SNR) of about 37 dB. The synthetic gradiometer technique was very effective to suppress the residual environmental fields, demonstrating the OPM gradiometer technique for highly cost-effective biomagnetic measurements.

关键词: optically pumped magnetometer (OPM), magnetocardiography (MCG), gradiometer

Abstract: Magnetocardiography (MCG) measurement is important for investigating the cardiac biological activities. Traditionally, the extremely weak MCG signal was detected by using superconducting quantum interference devices (SQUIDs). As a room-temperature magnetic-field sensor, optically pumped magnetometer (OPM) has shown to have comparable sensitivity to that of SQUIDs, which is very suitable for biomagnetic measurements. In this paper, a synthetic gradiometer was constructed by using two OPMs under spin-exchange relaxation-free (SERF) conditions within a moderate magnetically shielded room (MSR). The magnetic noise of the OPM was measured to less than 70 fT/Hz^1/2. Under a baseline of 100 mm, noise cancellation of about 30 dB was achieved. MCG was successfully measured with a signal to noise ratio (SNR) of about 37 dB. The synthetic gradiometer technique was very effective to suppress the residual environmental fields, demonstrating the OPM gradiometer technique for highly cost-effective biomagnetic measurements.

Key words: optically pumped magnetometer (OPM), magnetocardiography (MCG), gradiometer

中图分类号: (Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)

07.07.Df

87.85.Ox (Biomedical instrumentation and micro-electro-mechanical systems (MEMS)) 07.55.Ge (Magnetometers for magnetic field measurements)

张树林, 曹宁. A synthetic optically pumped gradiometer for magnetocardiography measurements[J]. 中国物理B, 2020, 29(4): 40702-040702.

Shu-Lin Zhang(张树林), Ning Cao(曹宁). A synthetic optically pumped gradiometer for magnetocardiography measurements[J]. Chin. Phys. B, 2020, 29(4): 40702-040702.

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A synthetic optically pumped gradiometer for magnetocardiography measurements

A synthetic optically pumped gradiometer for magnetocardiography measurements

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