Alcohols detection by a polymeric sensing film deposited on a long-period fiber grating


  • S. Muñoz-Aguirre Facultad de Ciencias Físico Matemáticas, Benemérita Universidad Autónoma de Puebla
  • J. Castillo-Mixcóatl Facultad de Ciencias Físico Matemáticas, Benemérita Universidad Autónoma de Puebla
  • G. Beltrán-Pérez Facultad de Ciencias Físico Matemáticas, Benemérita Universidad Autónoma de Puebla



Long-period fiber grating, Organic vapor sensor, Polydimethylsiloxane, Principal Components Analysis


In this paper, we report the construction and characterization of a sensor to detect volatile organic compounds, particularly alcohols. The sensor was fabricated by depositing a polydimethylsiloxane sensing film on the surface of a long-period fiber grating (LPFG). The LPFG spectrum, which was taken as the sensor response, was measured in a Teflon chamber, where different concentrations of methanol, ethanol, propanol, and butanol samples were injected. Spectral shifts to lower wavelength were observed for the last three samples. However, a shift to higher wavelengths for the case of methanol was observed, which was attributed to the fact that its refractive index is smaller than the one for PDMS. Therefore, curves of the sensor response in function of concentration were performed using different analysis techniques: analysis in a fixed wavelength, analysis in a fixed spectrum amplitude and spectral analysis trough principal components analysis (PCA) method. The results showed a regular behavior of the responses according to the molecular weight of the samples. A discussion of the use of each technique was performed.


S. Muñoz-Aguirre, A. Yoshino, T. Nakamoto and T. Moriizumi. Odor Approximation of Fruit Flavors Using a QCM Odor Sensing System, Sens. Actuat. B, 123 (2007) 1101-1106,

J. W. Gardner and J. Yinon (Editors). Electronic Noses and Sensors for the Detection of Explosives, Ed. Kluwer Academic Publishers, 2004.

J. W. Gardner and P. N. Bartlett. Electronic Noses, Oxford University Press, 1999.

H.J. Patrick, A.D. Kersey, F. Bucholtz, Analysis of the response of long period fiber gratings to external index of refraction, J. Light. Technol. 16 (1998) 1606–1612.,

J. Hromadka, B. Tokay, S. James, R.P. Tatam, S. Korposh, Optical fibre long period grating gas sensor modified with metal organic framework thin films, Sensors Actuators, B Chem. 221 (2015) 891–899.

Jiri Hromadka, Sergiy Korposh, Matthew Partridge. Volatile Organic Compound Sensing Using Optical Fiber Long-Period Grating with mesoporous nano-scale coating, Sensors, 17, (2017) 1-16,

M. Singh, S.K. Raghuwanshi, O. Prakash, Ultra-Sensitive Fiber Optic Gas Sensor Using Graphene Oxide Coated Long Period Gratings, IEEE Photonics Technol. Lett. 31 (2019) 1473–1476.

Carlos Martínez-Hipatl, Severino Muñoz-Aguirre, Georgina Beltrán-Pérez, Juan Castillo-Mixcóatl and Javier rivera de la Rosa; Detection of volatile organic compounds by an interferometric sensor, Sens. Actuat. B, 147 (2010) 37-42,

Gregory L. Klunder and Richard E. Russo. Core Based Intrinsic Fiber Optic Absorption Sensor for the Detection of Volatile Organic Compounds, Applied Spectroscopy 49 (1995) 379-385,

J.A. Barnes, R.S. Brown, A.H. Cheung, M.A. Dreher, G. Mackey and H. P. Loock, Chemical Sensing Using a Polymer Coated Long Period Fiber Grating Interrogated by Ring-Down Spectroscopy, Sens. Actuat. B, 148 (2010) 221-226,

Jian Zhang, Xiling Tang, Junhang Dong, Tao Wei and Hai Xiao. Zeolite Thin Film Coated Long-Period Fiber Grating Sensor for Measuring Trace Organic Vapors, Sens. Actuat. B, 135 (2009) 420-425,

Marcos Rodríguez-Torres, Víctor Altuzar, Claudia Mendoza-Barrera, Georgina Beltrán-Pérez, Juan Castillo-Mixcóatl and Severino Muñoz-Aguirre, Discrimination Improvement of a Gas Sensors’ Array Using High-Frequency Quartz Crystal Microbalance Coated with Polymeric Films, Sensors, 20 (2020) 6972,

A. Hierlemann, E.T. Zellers, A.J. Ricco, Use of linear solvation energy relationships for modeling responses from polymer-coated acoustic-wave vapor sensors, Anal. Chem. 73 (2001) 3458–3466,



2021-06-24 — Updated on 2021-07-06