Pei Yifeng

Pei Yifeng
Chinese Academy of Sciences | CAS

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8
Publications
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81
Citations

Publications

Publications (8)
Article
Full-text available
The accuracy of Tesla/Volt calibration factors for SQUID gradiometers is essential to take advantage of magnetic gradient tensor (MGT), but the accuracy of the published calibration procedures rang from tenths of per cent to a few per cent. In this paper, we propose an efficient calibration method for planar SQUID gradiometers based on the MGT comp...
Article
A SQUID planar gradiometer is an extremely sensitive sensor for magnetic gradient measurements. It has been shown to have potential applications for aeromagnetic detection. The major challenge when operating an aeromagnetic SQUID system in actual environment is the motion noise, including the inherent response resulting from gradiometer imbalance a...
Article
Transient Electromagnetic Method (TEM) is an effective way for mineral resource prospecting if an induction coil is used as the traditional sensor. Superconducting Quantum Inter-ference Device (SQUID) obtains excellent sensitivity at low fre-quency compared to coil. Thus the exploration depth and accura-cy of TEM can be greatly improved. However, u...
Article
In order to enhance the signal-to-noise ratio (SNR) of ultra-low field magnetic resonance imaging (MRI) measure-ments, a prepolarization ( $B_p$ ) coil is usually introduced to gener-ate a magnetic field with magnitude in the order of tens of mT or even stronger to prepolarize the sample before MRI sequences. The macromagnetization M of the sample...
Article
Full-text available
Time-domain transient electromagnetic method (TEM) measurements sometimes exhibit a sign reversal in the secondary field during the off-time, which is usually attributed to the induced-polarization (IP) effect. In contrast with the conventional IP method, which uses a current source, TEM with an ungrounded transmitting loop operates using a pure vo...
Article
Full-text available
As an effective and efficient geophysical tool, airborne EM (AEM) is specifically suitable for the exploration in areas of high mountains, desert, swamp, and forest. With the development of national economy of China, the demand for mineral resources increases sharply, geophysical explorations in areas with favorable geological conditions have been...

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