Real-time monitoring of soil moisture field using ultra-weak fiber Bragg gratings

Weikang Liu; Wensong Zhou

doi:10.1117/12.2625195

27 March 2022 Real-time monitoring of soil moisture field using ultra-weak fiber Bragg gratings

Weikang Liu, Wensong Zhou

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 121698Z (2022) https://doi.org/10.1117/12.2625195
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

Soil moisture field has an obvious influence on the stability of reservoir bank slope. Thus, effective, real-time, reliable, and high precision monitoring methods are imperative. However, the existing soil moisture monitoring methods have more or less deficiencies. In this paper, a novel soil moisture monitoring and estimation method based on an ultra-weak fiber Bragg grating (UWFBG) array is proposed which is suitable for large-scale in-situ monitoring. A soil moisture monitoring device is designed and fabricated. This monitoring device consists of several monitoring units, and each monitoring unit consists of a soil container, protector and two UWFBG. Laboratory calibration tests were conducted to establish a relationship between wavelength change and soil moisture content. The test results show that the monitoring accuracy of the device is related to the quality of the loaded dry soil. When the mass of dry soil is 100 g, the monitoring accuracy of soil moisture content is 1.68 % (mass ratio).

Citation Download Citation

Weikang Liu and Wensong Zhou "Real-time monitoring of soil moisture field using ultra-weak fiber Bragg gratings", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 121698Z (27 March 2022); https://doi.org/10.1117/12.2625195

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