New optical cell design for pollutant detection
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Identificadores
URI: http://hdl.handle.net/10902/2306DOI: 10.1117/12.456083
ISSN: 1996-756X
ISSN: 0277-786X
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Conde Portilla, Olga María; García Barrio, Sergio; Mirapeix Serrano, Jesús María; Echevarría Cuenca, Juan; Madruga Saavedra, Francisco Javier; López Higuera, José MiguelFecha
2002-02-18Derechos
© 2002 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Publicado en
Proceedings of SPIE, 2002, Vol. 4578, 283-290
Fiber Optic Sensor Technology and Applications, Boston, 2001
Editorial
SPIE Society of Photo-Optical Instrumentation Engineers
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Palabras clave
Gas cell
Multipass cell
Gas sensor
Resumen/Abstract
A new and simple optical gas cell, developed to perform as the transducer for a methane fiber optic sensor, is presented. Its main advantage lies in the fact that, employing low-cost components and an easy alignment process, the path where the light beam is in contact with the pollutant becomes maximized to as much as four times the physical length of the optical cell. This increment in optical length is directly related to the optimization of the fiber optic sensor since low levels of methane concentration can be measured as stated by Beer-Lambert's law. One of the main advantages of this design lies in the simplicity of the optic cell, which makes it very interesting when one has to deal with the manufacturing process. The cell is mounted on a reflective configuration which improves the connection as only one optical fiber is employed. The main elements of the cell are an optical fiber, a mirror of high reflectivity and a converging lens arranged in an appropriate fashion to obtain the desired result. With this relatively reduced and low cost set of devices the insertion losses achieved are in the range of the 4-5 dB's.
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