Performance evaluation of two types of heated cables for distributed temperature sensing-based measurement of soil moisture content

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• 作者：Dingfeng Cao^aAuthor Vitae ; Bin Shi^a ; ^{shibin@nju.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Honghu Zhu^a ; ^{zhh@nju.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Kun Zhu^a ; Guangqing Wei^b ; Kai Gu^a
• 关键词：Soil moisture content ; Carbon-fiber heated cable (CFHC) ; Metal-net heated cable (MNHC) ; Distributed measurement ; Optical fiber
• 刊名：Journal of Rock Mechanics and Geotechnical Engineering
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：8
• 期：2
• 页码：212-217
• 全文大小：767 K

文摘

Distributed temperature sensing (DTS) using heated cables has been recently developed for distributed monitoring of in-situ soil moisture content. In this method, the thermal and electrical properties of heated cables have a significant influence on the measurement accuracy of soil moisture content. In this paper, the performances of two heated cables, i.e. the carbon-fiber heated cable (CFHC) and the metal-net heated cable (MNHC), are studied in the laboratory. Their structures, uniformity in the axial direction, measurement accuracy and suitability are evaluated. The test results indicate that the MNHC has a better uniformity in the axial direction than CFHC. Both CFHC and MNHC have high measurement accuracy. The CFHC is more suitable for short-distance measurement (≤500 m), while the MNHC can be used for long-distance measurement (>500 m).