Soil moisture content measurement using optical fiber long period gratings

Hallett, J. S.; Partridge, Matthew; James, Stephen W.; Tiwari, Divya; Farewell, Timothy S.; Hallett, Stephen H.; Tatam, Ralph P.

doi:10.1117/12.2263427

“…The use of an optical fiber LPG as a soil moisture sensor was also reported [369]. The device revealed sensitivity to moisture levels in the range of 10-50% in both clay and sandy soils.…”

Section: Moisture Sensormentioning

confidence: 94%

Chemically modified optical fibers in advanced technology: An overview

Shukla

¹

,

Kushwaha

²

,

Güner

³

et al. 2019

Optics & Laser Technology

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“…Determined the range of variation of the transmitted effort, we decided to use mechanical LPG fiber optic sensors of 600μm of period and 15mm of length [14,17] to measure this parameter. Figure 1a shows the variation of the transmittance of this sensor subjected to loads up to 101 KPa.…”

Section: A Mechanical Lpg Sensorsmentioning

confidence: 99%

Monitoring of stresses and deformations in soils by fiber optic sensors

Mosquera¹,

Basurto²

2018

Proceedings of the 16th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Innovation in Educat

0

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This paper shows the application of LPG optical fiber sensors to the determination of the transmitted stress and deformation of a sample of confined soil subjected to surface loads. The transmitted stress was measured by a mechanical LPG pressure sensor and the curvature of the ground by permanent LPG sensors buried at depths of 0.1m; 0.2m; 0.4m and 0.6m. Clay-sandy soil characteristic of UNICAMP was deposited in a cylinder of 0.8m in length and 0.30m in diameter. The soil was lightly compacted in 0.2m layers and an LPG sensor was installed on each layer. Surface loads of up to 227 KPa were applied to the surface of the soil, measuring axial soil deformations of less than 3mm by our sensors with sensitivities of the order of 0.22 mm/dB. The values of the modulus of elasticity for this type of soil were determined from the fitting of the Boussinesq equations with the values measured by the buried LPG sensors. A Young's modulus of 5.40 MPa and a Poisson's coefficient ν = 0.52 were determined for this type of soil.

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“…A. Mechanical LPG sensors Determined the range of variation of the transmitted effort, we decided to use mechanical LPG fiber optic sensors of 600μm of period and 15mm of length [14,17] to measure this parameter. Figure 1a shows the variation of the transmittance of this sensor subjected to loads up to 101 KPa.…”

Section: The Fiber Optic Sensorsmentioning

confidence: 99%

“…The flexural sensitivity of the grating recorded in single mode fibers with CO2 laser and the technique to determine their sensitivity to curvature changes are explained in the references [14,17].…”

Section: B Sensors Engraved On the Fiber With Co2 Lasermentioning

confidence: 99%

Monitoring of stresses and deformations in soils by fiber optic sensors

Mosquera¹,

Basurto²

2018

EasyChair Preprints

0

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This paper shows the application of LPG optical fiber sensors to the determination of the transmitted stress and deformation of a sample of confined soil subjected to surface loads. The transmitted stress was measured by a mechanical LPG pressure sensor and the curvature of the ground by permanent LPG sensors buried at depths of 0.1m; 0.2m; 0.4m and 0.6m. Clay-sandy soil characteristic of UNICAMP was deposited in a cylinder of 0.8m in length and 0.30m in diameter. The soil was lightly compacted in 0.2m layers and an LPG sensor was installed on each layer. Surface loads of up to 227 KPa were applied to the surface of the soil, measuring axial soil deformations of less than 3mm by our sensors with sensitivities of the order of 0.22 mm/dB. The values of the modulus of elasticity for this type of soil were determined from the fitting of the Boussinesq equations with the values measured by the buried LPG sensors. A Young's modulus of 5.40 MPa and a Poisson's coefficient ν = 0.52 were determined for this type of soil.

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Soil moisture content measurement using optical fiber long period gratings

Cited by 5 publications

References 7 publications

Chemically modified optical fibers in advanced technology: An overview

Chemically modified optical fibers in advanced technology: An overview

Monitoring of stresses and deformations in soils by fiber optic sensors

Monitoring of stresses and deformations in soils by fiber optic sensors

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