Infrared and Laser Engineering, Volume. 51, Issue 3, 20210299(2022)
All-optical fiber miniature soil moisture content sensor
Figures & Tables(9)
Fig. 2. Probe structure of all optical fiber soil moisture content sensor
Fig. 6. Comparison of measurement errors of soil moisture content before and after temperature compensation
Fig. 7. Temperature variation diagram of sensing probe in different types of soil samples
Table 1. Parameters of soil moisture content test platform
View tableView in ArticleTable 1. Parameters of soil moisture content test platform
Parameter Value Probe material Stainless steel Soil type Sand/Loess Pump light source wavelength 1480 nm Demodulator model GC-97001C Pump light heating power 450 mW Electronic weighing instrument accuracy 0.001 g Drying box temperature/heating time 120 ℃/12 h Doped Bragg grating center wavelength 1550.038 nm Reference grating center wavelength 1539.870 nm
Table 2. Results of different moisture content measurement methods
View tableView in ArticleTable 2. Results of different moisture content measurement methods
Drying method Fibe r method Electronic method Value Error Value Error 3.1% 4.26% 1.16% 5.3% 2.20% 6.5% 6.99% 0.49% 8.9% 2.40% 14.4% 12.99% −1.41% 15.6% 1.20% 15.6% 15.4% −0.20% 18.3% 2.70% 17.5% 18.28% 0.78% 20.4% 2.90%
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Jiamin Wang, Zhen Li, Jiqiang Wang. All-optical fiber miniature soil moisture content sensor[J]. Infrared and Laser Engineering, 2022, 51(3): 20210299
Paper Information
Category: Optical devices
Received: May. 10, 2021
Accepted: --
Published Online: Apr. 8, 2022
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