Optical-integrated NH3 sensor design based on WO3 thin films: influence of gas adsorption and chromic effects

Hugo E. Lazcano Hernández; Celia Sánchez Pérez; Augusto García Valenzuela; Alejandro Esparza García; Marco A. Camacho López

doi:10.1117/12.742303

15 May 2007 Optical-integrated NH₃ sensor design based on WO₃ thin films: influence of gas adsorption and chromic effects

Hugo E. Lazcano Hernández, Celia Sánchez Pérez, Augusto García Valenzuela, Alejandro Esparza García, Marco A. Camacho López

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Proceedings Volume 6422, Sixth Symposium Optics in Industry; 642213 (2007) https://doi.org/10.1117/12.742303
Event: Sixth Symposium Optics in Industry, 2007, Monterrey, Mexico

Abstract

It has been observed in the literature, developments about characterization of several materials for gas sensing application; simultaneously, also it has been observed that only some of them show a procedure of design for the implementation of these materials in a device or an optical system. In consequence, appears differences between the predicted by theory and the experiments. For that reason, the present work proposes a new approach for the design of optical-integrated (OI) sensors. We show the advances in the design of an OI sensor for ammonia detection (NH₃), using tungsten trioxide (WO₃) as sensitive material. We considered a model that incorporates the concepts of the kinetic of gas adsorption on solids, the effects of the real and imaginary part of the refractive index in the redistribution of the optical field, and the influence of the photo and thermochromism, before and during the sensing mechanism. Although the work has not been concluded, we can affirm that the concepts incorporated in this proposal, must be considered as critical parameters in the design of an OI sensor or an optical fiber (FO) sensor.

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Hugo E. Lazcano Hernández, Celia Sánchez Pérez, Augusto García Valenzuela, Alejandro Esparza García, and Marco A. Camacho López "Optical-integrated NH₃ sensor design based on WO₃ thin films: influence of gas adsorption and chromic effects", Proc. SPIE 6422, Sixth Symposium Optics in Industry, 642213 (15 May 2007); https://doi.org/10.1117/12.742303

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KEYWORDS

Refractive index

Sensors

Transmittance

Adsorption

Waveguides

Atmospheric propagation

Glasses

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