Crystal Temperature Sensor

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Crystal Temperature Sensor

• Travis Ellison
• Courtney Palmer
• The University of Tulsa
• William M. Patton
• Geophysical Research Center

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Project Goal

• To deposit a resistance temperature detector
  (RTD) onto a quartz crystal pressure transducer
  by
• Directly depositing a platinum trace onto the
  crystal surface
• or
• Bonding a prefabricated film RTD to the surface
  of the crystal

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Project Purpose

• To achieve direct and more accurate measurements
  of temperature
• Enhance the reliability and performance of
  products made by GRC.

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What is an RTD?
(Copied from www.capgo.com)

• resistance temperature detectors (RTDs), are
  temperature sensors that exploit the predictable
  change in electrical resistance of a material
  with changing temperature. The most common
  material is platinum.

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Wire-wound RTD

• Can have greater accuracy, especially for wide
  temperature ranges.
• The coil diameter provides a compromise between
  mechanical stability and accuracy.
• Allows expansion of the wire to minimize strain
  and consequential drift.

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Film Type RTD

• Have an extremely thin layer of platinum on a
  substrate.
• Advantage
• Low cost and fast response compared to wire
  wound RTD.
• Disadvantage
• Different expansion rates of the substrate and
  platinum give strain gauge" effects and has
  stability problems.

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Applications

• Will be used for temperature and pressure data
  acquisition in down hole applications
• Will be used almost exclusively for the oil
  industry.

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Our Sponsors

• Geophysical Research Company, LLC
• The University of Tulsa
• Oklahoma Center for the Advancement of Science
  and Technology