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System and method for measurement incorporating a crystal resonator

  • US 9,097,101 B2
  • Filed: 03/29/2012
  • Issued: 08/04/2015
  • Est. Priority Date: 03/29/2012
  • Status: Active Grant
First Claim
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1. A system for interrogating a downhole environment in a borehole beneath a surface, comprising:

  • a source of electromagnetic energy, operable to transmit an electromagnetic signal in the borehole;

    a sensor module, comprising a passive resonating circuit having a resonant frequency that varies with changes in a condition in the downhole environment, such that the resonating circuit returns at least a portion of the electromagnetic signal along with harmonics of the resonant frequency in response to the condition in the downhole environment in the borehole;

    a detector, positionable to receive the returned portion of the electromagnetic signal, the detector including a filter configured and arranged to attenuate a signal at the resonant frequency, and configured and arranged to pass a signal at a harmonic of the resonant frequency.

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