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| 一种快速有效的NQR探头恢复方法 | |
| 引用本文： | 陈星,徐更光. 一种快速有效的NQR探头恢复方法[J]. 波谱学杂志, 2008, 25(3): 397-401 |
| 作者姓名： | 陈星 徐更光 |
| 作者单位： | （北京理工大学 宇航科学技术学院，北京 100081） |
| 摘 要： | 介绍了一种用于主动减小NQR探头恢复时间的Q值变换电路，它利用MOEFET控制变Q电路与探头电路的耦合，并通过变压器增加与电感线圈串联的阻抗值以达到改变Q值的目的. 此电路不会产生新的振铃也不会对接收NQR的分辨率造成损失. 实验结果表明，电路能有效缩短探头的恢复时间，同时还可以提高信噪比. |
| 关 键 词： | 探头 NQR 变Q电路 恢复时间 |
| 收稿时间： | 2007-10-22 |
| 修稿时间： | 2007-11-28 |
NQR Probe Recovery Time Reduction with a Novel Active Q-Switching Circuit |
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| CHEN Xing,XU Geng-guang. NQR Probe Recovery Time Reduction with a Novel Active Q-Switching Circuit[J]. Chinese Journal of Magnetic Resonance, 2008, 25(3): 397-401 | |
| Authors: | CHEN Xing XU Geng-guang |
| Affiliation: | (School of Aerospace Science and Ongineering, Beijing Institute of Technology，Beijing 100081, China) |
| Abstract: | An active Q-switching circuit using a transformer is described for reducing the recovery time of NQR probes. A MOSFET was used to control the coupling and decoupling states of the Q-switching circuit to the probe so that it did not operate during the reception of NQR signals. The performance of the circuits was demonstrated by experimental results. It was shown that the circuit did not create new ringing, and caused no loss in sensitivity. |
| Keywords: | NQR NQR probe Q-switching recovery time |
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