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Sensor on a drilling apparatus

  • US 9,121,258 B2
  • Filed: 11/04/2011
  • Issued: 09/01/2015
  • Est. Priority Date: 11/08/2010
  • Status: Active Grant
First Claim
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1. A drilling apparatus comprising:

  • a drill string to be disposed in a borehole, the drill string comprising;

    a tubular;

    a borehole assembly coupled to the tubular; and

    a drill bit disposed at an end of the borehole assembly;

    a sensor assembly on the drill string, the sensor assembly including an insulating layer on the tubular and a layer of strain sensitive material sputter deposited onto the insulating layer;

    wherein a pattern is etched into the strain sensitive material after deposition to form a strain gauge.

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