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標題: Design and Simulation of the Superconducting Quantum Interference Device Measurement System with Planar Gradiometers
作者: 鄭培煜
Cheng, Pei-Yu
關鍵字: 量子超導干涉儀;Superconducting Quantum Interference Device;平面梯度計;Planar Gradiometers
出版社: 物理學系所
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Superconducting QUantum Interference Devices (SQUIDs) have been extensively used in the detection of very small magnetic signals. We have designed a SQUID measurement system including a pick-up coil in a gradiometer configuration which can cancel the background noise and strong uniform DC magnetic field. We use this system to detect the variation of the magnetic dipoles of GaAs in a strong magnetic field. We have estimated the flux from the sample, inductance of the coils and also the detecting limit of the voltage signal. We demonstrate the operation method of the feedback loop worked in our SQUIDs measurement system. At the end, we propose several methods to improve the sensitivity, such as increasing the number of the coil and the frequency of the AC signal. We expect the detected signal can be enhanced around 2 to 3 orders of magnitude.
其他識別: U0005-1607201018281100
Appears in Collections:物理學系所

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