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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 27 — Dec. 19, 2011
  • pp: 26079–26087

Optical cavity for auto-referenced gas detection

Juan Carlos Martinez Antón and Manuel Silva-López  »View Author Affiliations

Optics Express, Vol. 19, Issue 27, pp. 26079-26087 (2011)

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An enhanced optical system design for NDIR gas detection is presented. Multiple paths lengths within the same cavity are used to auto reference the system. The system has good thermo-mechanical stability: it requires no special thermal stabilization, shows no sensitivity to thermal emitter drift and has no moving parts involved. Long term stability, virtually no zero-drift and sub-ppm level gas detection were achieved using commercial thermopile sensors and a thermal emitter modulated at low frequency (~0.5 Hz). Experimental tests were performed using carbon monoxide (CO) and a 30.5 cm cavity length. The design can be extended to allow multiple gas detection within the same optical cavity.

© 2011 OSA

OCIS Codes
(120.1880) Instrumentation, measurement, and metrology : Detection
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(120.4570) Instrumentation, measurement, and metrology : Optical design of instruments
(300.6340) Spectroscopy : Spectroscopy, infrared

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: October 6, 2011
Revised Manuscript: November 11, 2011
Manuscript Accepted: November 13, 2011
Published: December 7, 2011

Juan Carlos Martinez Antón and Manuel Silva-López, "Optical cavity for auto-referenced gas detection," Opt. Express 19, 26079-26087 (2011)

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