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Proceedings Paper

Soil water evaporation measurement of lysimeter based on fiber Bragg grating sensor
Author(s): Kejun Yan; Jun Liu; Liping Miao; Li Bai; Wenting Zhong
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Paper Abstract

A lysimeter weighing system based on fiber Bragg grating (FBG) sensor for measuring the soil water evaporation was presented in this paper. By the use of three mechanical levers and balance weight, the weight loaded on the FBG sensor was reduced K times (here, K was the ratio of levers). So the amount of water change in the soil container of tons can be weighted. A two-hole cantilever was selected as the elastomer structure of FBG weighing sensor, and an optimum design was carried on using the finite element method to meet the small-scaled design requirements. Using the matching fiber Bragg grating demodulation method based on LabVIEW, the demodulation system was easy to be implemented. Then the FBG center wavelength drift was converted into a time interval, and the weight can be obtained automatically through measuring the interval by computer. Preliminary experiment showed that this weighing system has the ability of measuring soil water evaporation accurately.

Paper Details

Date Published: 10 October 2013
PDF: 6 pages
Proc. SPIE 8916, Sixth International Symposium on Precision Mechanical Measurements, 89162S (10 October 2013); doi: 10.1117/12.2035819
Show Author Affiliations
Kejun Yan, Xi’an Univ. of Technology (China)
Jun Liu, Xi'an Univ. of Technology (China)
Liping Miao, Xi’an Univ. of Technology (China)
Li Bai, Xi’an Univ. of Technology (China)
Wenting Zhong, Xi’an Univ. of Technology (China)

Published in SPIE Proceedings Vol. 8916:
Sixth International Symposium on Precision Mechanical Measurements
Shenghua Ye; Yetai Fei, Editor(s)

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