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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 21 — Jul. 20, 2007
  • pp: 4625–4632

Analytical method to find the optimal parameters for gas detectors based on correlation spectroscopy using a Fabry–Perot interferometer

Everardo Vargas-Rodríguez and Harvey N. Rutt  »View Author Affiliations

Applied Optics, Vol. 46, Issue 21, pp. 4625-4632 (2007)

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Several designs of infrared sensors use a Fabry–Perot interferometer (FPI) to modulate the incident light. In this work we analyze the particular case where the FPI fringes are matched with very well defined rovibrational absorption lines of a target molecule such as CO 2 , C O , N 2 O , or CH 4 . In this kind of sensor, modulation is induced by scanning the FPI cavity length over one half of the reference wavelength. Here we present an analytical method based on the Fourier transform, which simplifies the procedure to determine the sensor response. Furthermore, this method provides a simple solution to finding the optimal FPI cavity length and mirror reflectivity. It is shown that FPI mirrors with surprisingly low reflectivity ( < 50 % ) are generally the optimum choice for target gases at atmospheric pressure. Finally, experimental measurements and simulation results are presented.

© 2007 Optical Society of America

OCIS Codes
(070.2590) Fourier optics and signal processing : ABCD transforms
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot
(130.6010) Integrated optics : Sensors
(220.4830) Optical design and fabrication : Systems design
(300.6340) Spectroscopy : Spectroscopy, infrared

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: February 26, 2007
Manuscript Accepted: March 28, 2007
Published: July 6, 2007

Everardo Vargas-Rodríguez and Harvey N. Rutt, "Analytical method to find the optimal parameters for gas detectors based on correlation spectroscopy using a Fabry–Perot interferometer," Appl. Opt. 46, 4625-4632 (2007)

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