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Nuclear quadrupole resonance system

  • US 9,476,953 B1
  • Filed: 08/26/2013
  • Issued: 10/25/2016
  • Est. Priority Date: 08/24/2012
  • Status: Expired due to Fees
First Claim
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1. A Nuclear Quadrupole Resonance (NQR) measurement system for detecting at least one material under test (MUT), the system comprising:

  • a waveform generator configured to generate a continuous wave (CW) input signal comprising one or more frequencies;

    a chamber configured to receive the at least one MUT when carried by a person passing through the chamber;

    a probe configured to excite the MUT and then detect NQR RF emissions from the MUT;

    a bridge circuit configured to subtract a signal representing the CW input signal in the chamber from a response signal that includes the CW input signal and the NQR RF emissions to generate output NQR RF emissions;

    a detector configured to detect the MUT based, at least in part, on the NQR RF emissions; and

    a signal generator configured to generate the CW input signal;

    wherein the bridge circuit further comprises;

    a reference impedance; and

    a resistor connected between the signal generator and the reference impedance, wherein the signal representing the CW input signal is generated at a node between the signal generator and the reference impedance.

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