Integrated optical and electronic pressure sensor

Ivan Padron, Anthony T. Fiory, N. Ravindra

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

A pressure sensor that combines two principles of measurement into one integrated unit with optical and electronic parts is fabricated and tested. The sensing element for both integrated parts is an embossed silicon diaphragm that deflects under differential pressure. The optical part of the sensor is based on FabryPerot interferometry; the electronic part of the sensor is based on the piezoresistive effect in silicon. In the application of FabryPerot interferometry, the sensing element utilizes an optical cavity, where interference of multiple reflections changes with movement of the diaphragm caused by pressure. In the application of the piezoresistive effect, a change in the electrical resistivity of a sensor material is induced by mechanical stress in the diaphragm and detected by a Wheatstone bridge circuit. The advantages of introducing the embossed diaphragm in sensor fabrication and its benefits for integration are discussed. The existence of a nearly ideal FabryPerot interferometer in the optical part of the sensor is demonstrated experimentally. Noise characteristics of the FabryPerot part of the sensor are presented. The independently produced electronic output serves to establish the quiescence point (Q-point) of the output from the optical part of the sensor.

Original languageEnglish (US)
Article number5582178
Pages (from-to)343-350
Number of pages8
JournalIEEE Sensors Journal
Volume11
Issue number2
DOIs
StatePublished - Jan 1 2011

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Electrical and Electronic Engineering

Keywords

  • Diaphragm pressure sensor
  • Fabry-Perot interferometry
  • embossed diaphragm
  • integrated sensor
  • piezoresistors

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