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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/014/05/0363-0371

    • Keywords

       

      Pulsed NMR spectrometer; pulse programmer; gated transmitter; video amplifier; quench circuit; box car integrator

    • Abstract

       

      A 10 MHz pulsed NMR spectrometer, built using mostly solid state devices, is described. The pulse programmer provides 2-pulse, 3-pulse, saturation burst and Carr-Purcell sequences both in repetitive and manual modes of operation. The transmitter has a maximum power output of ∼ 2 kW with a 75 Ω output impedance termination. The total gain of the receiver system is around 120 dB with a minimum band width of 2 MHz. The recovery time of the receiver is ∼ 7 µsec. A two-channel boxcar integrator capable of working in the single channel, differential and double boxcar modes provides signal to noise ratio improvement. The sensitivity and the linearity of the boxcar integrator are ∼ 2 mV and ∼ 0.1% respectively.

    • Author Affiliations

       

      R K Shenoy1 2 J Ramakrishna1 K R Jeffrey1 3

      1. Department of Physics, Indian Institute of Science Bangalore - 560 012, India
      2. Department of Physics, University of Waterloo, Waterloo, Canada
      3. Department of Physics, University of Guelph, Guelph, Ontario, Canada
    • Dates

       
  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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