波谱学杂志 ›› 1996, Vol. 13 ›› Issue (1): 95-97,100.

• 研究论文 • 上一篇    下一篇

一种简单的快恢复14N NQR探头

李鲠颖, 谢海滨, 夏小建   

  1. 华东师范大学分析测试中心, 上海 200062
  • 收稿日期:1995-01-15 修回日期:1995-04-19 出版日期:1996-02-05 发布日期:2018-01-17
  • 基金资助:
    上海市科委"青年科技启明星重点培养计划"资助项目

A SIMPLE SCHEME FOR 14N NQR PROBE WITH FAST RECOVERY TIME

Li GengYing, Xie Haibin, Xia Xiaojian   

  1. Analytical Center, East China Normal University, Shanghai 200062
  • Received:1995-01-15 Revised:1995-04-19 Online:1996-02-05 Published:2018-01-17

摘要: 利用一与射频脉冲同步的门控信号使探头在发射和接收时呈现不同的Q值,从而能够在不降低接收14N NQR信号的情噪比条件下极大地缩小探头的恢复时间.初步的实验结果表明:通过适当选择衰减电阻的阻值,提出的探头设计能够将常规探头的"死时间"限制在20μs以内.

关键词: 14N NQR, 探头, 快恢复

Abstract: The present paper proposes a simple scheme, which involves synchronous gated circuit with the radio-frequency pulses, to construct probe that exhibits different Q values between the transmitting and receiving periods. This proposal results in a dramatic reduction of the recovery time of the probe without attenuating the S/N of 14N NQR spectra. The experimental result demonstrates that with suitably chosen R, the damping resistor, the "dead-time" of the spectrometer can be confined in 20μs by using the suggested probe circuit.

Key words: 14N NQR, Probe, Fast recovery