Fibre-optic differential pressure sensor

Wright, Oliver B.; Largeau, D.

doi:10.1088/0022-3735/20/1/008

Cited by 6 publications

(4 citation statements)

References 18 publications

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“…All the most common optical sensing approaches have been explored, including those based on intensity, phase and wavelength measurement. The simplest approach is based on the measurement of pressure-induced losses [1]. However, the simplicity of these sensors comes at the expense of low accuracy and slow response time.…”

Section: Introductionmentioning

confidence: 99%

Design and field testing of a fiber optic pressure sensor for underground water level monitoring

Schenato

Lopez

Galtarossa

et al. 2019

Seventh European Workshop on Optical Fibre Sensors

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The paper illustrates the design and field test of a rugged FBG sensor prototype for high-sensitivity measurement of groundwater level (GWL) variations. Pressure sensors have many fields of application, ranging from environmental monitoring to the oil and gas industry. In particular, pressure sensors can be used to monitor the stability of dikes and embankments by measuring the inner phreatic level at their foot to detect anomalous filtration and excess of pore pressures. For this application, rather high sensitivity at an affordable cost is required. In recent years, fiber optic pressure sensors have been explored with different solutions, but the technologies proposed so far have either small sensitivity and hence are befitted for large pressure ranges, or are based on interferometry and hence require rather expensive laser sources. The sensor described in this paper exploits a 3D-printed mechanical transducer to convert external pressure in longitudinal strain along the fiber. A second FBG, embedded in the sensor, is used to compensate for temperature cross-sensitivity. The structure is enclosed in an aluminum alloy case to withstand harsh environments and installation procedures. Pressure and temperature sensitivities of the sensor are about 20 2 ⁄ and 17 /°, respectively. Three sensors of this type have been successfully tested in a large scale dike at the Flood Proof Holland facility, in Delft, Netherlands.

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Section: Introductionmentioning

confidence: 99%

Design and field testing of a fiber optic pressure sensor for underground water level monitoring

Schenato

Lopez

Galtarossa

et al. 2019

Seventh European Workshop on Optical Fibre Sensors

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“…An interesting feature of this approach is that when the grating period is equal to the pitch length of rays in a multimode fiber, a resonance effect occurs causing a large loss for small amplitude microbends [2]. The second method, in which a single macrobend is applied to the fiber to cause the loss of light, has been used in such diverse applications as fusion splicing, live fiber identification [3], optical taps [4]- [6], and pressure sensors [7]. Since concentrated beams of light have been observed to radiate from macrobends [6], [8], [9], this mechanism would seem to hold promise as the basis for a high-efficiency, high-speed optical tap.…”

mentioning

confidence: 99%

“…A loss formula for macrobends was calculated by Winkler et al [lo] but previously reported measurements of loss as a function of the radius of curvature have shown only qualitative agreement (see Manuscript for example [7]). One difficulty with multimode taps is that the amount of tapped light is sensitive to the modal power distribution (MPD).…”

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confidence: 99%

Simulation and measurement of radiation loss at multimode fiber macrobends

Loke

McMullin

1990

J. Lightwave Technol.

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A ray-tracing model for light propagation in bent multimode fibers is described which takes modal effects into account. Calculations of the bend loss using this model are compared with measurements and good agreement is obtained. Universal loss curves for various bend radii are found as a function of principal mode group number. The radiation pattern is also investigated and qualitative agreement is found between simulation and experiment.

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“…The FODPS is needed in physical, chemical, biochemical, analytical and biomedical applications [1][2][3]. The diaphragm deformation due to change in pressure was sensed by FODPS.…”

Section: Introductionmentioning

confidence: 99%

Modeling Simulation and Fabrication of Fiber Optic Pressure Sensor Probe

Dongare¹,

Buchade²,

Shaligram³

2010

IJCA

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Elastic element mechanical pressure gages consisting diaphragm are basically used for the differential pressure measurement. In FODPS, diaphragm acts as a reflector. A flexible disc of plastic is used as a diaphragm to convert the measuring pressure to the deflection of diaphragm. Concentric corrugations are designed to linearise the deflections according to pressure. Reference and measuring pressures are applied to control and experimental headspaces respectively. As the pressure changes in the experimental head space, the diaphragm is deform and displaces, and distance between fiber tip and plane of diaphragm changes and thus resultant reading is proportional to the differential pressure.

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Fibre-optic differential pressure sensor

Cited by 6 publications

References 18 publications

Design and field testing of a fiber optic pressure sensor for underground water level monitoring

Design and field testing of a fiber optic pressure sensor for underground water level monitoring

Simulation and measurement of radiation loss at multimode fiber macrobends

Modeling Simulation and Fabrication of Fiber Optic Pressure Sensor Probe

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