Potential multi-parametric OFDR system based on the wavelength-division cross-correlation method

In this study, an optical frequency domain reflectometer (OFDR) system for simultaneous measurement of temperature, strain, and relative humidity (RH) based on the wavelength-division cross-correlation method is proposed and experimentally demonstrated. The Rayleigh scattered spectrum shifts introdu...

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Bibliographic Details
Published in:Applied optics (2004) 2024-08, Vol.63 (23), p.6146
Main Authors: Li, Shuai, Yang, Xiyu, Zhang, Botong, Qu, Shuai, Xu, Yanping, Liu, Zhaojun, Qin, Zengguang
Format: Article
Language:English
Subjects:
Correlation analysis
Cross correlation
Decoupling
Frequency domain analysis
Optical frequency
Parameter sensitivity
Relative humidity
Signal processing
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Summary:In this study, an optical frequency domain reflectometer (OFDR) system for simultaneous measurement of temperature, strain, and relative humidity (RH) based on the wavelength-division cross-correlation method is proposed and experimentally demonstrated. The Rayleigh scattered spectrum shifts introduced by environmental changes can be demodulated by the cross-correlation operation, and the magnitude of the shifts exhibits variability in distinct wavelength subregions. Leveraging the distinct sensitivity characteristics of different parameters across different wavelength subregions, simultaneous multi-parameter decoupling can be achieved. In the signal processing flow, the frequency domain signals in different wavelength subregions are intercepted, and then the cross-correlation operation is performed separately to obtain the spectrum shift information in different wavelength subregions. The decoupling matrix is constructed to realize the decoupling of the three parameters based on the sensitivity differences of temperature, strain, and RH in different wavelength subregions. This novel and simple multi-parameter sensing system, to the best of our knowledge, has potential applications in engineering monitoring, chemical applications, and environmental measurements.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.529643