Analysis, compensation, and correction of temperature effects on FBG strain sensors

Haber, Todd; Ferguson, Steve; Guthrie, D.; Graver, Tom; Soller, Brian J.; Méndez, Alexis

doi:10.1117/12.2018772

Cited by 10 publications

(6 citation statements)

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“…An FBG sensor has a specific structure formed in the core of an optical fiber, characterized by periodical changes in the refractive index value [37]. The measured value (deformation, temperature) is directly proportional to the displacement of the so-called Bragg wave (λ B ), which depends on a change in the grating period (Λ) resulting from the changes in fiber size (compressing, stretching) and thermal effects (thermal expansion of the material and the thermo-optic effect on the refractive index) [38].…”

Section: Fiber Optical Sensors-fiber Bragg Gratingsmentioning

confidence: 99%

Validation of Selected Optical Methods for Assessing Polyethylene (PE) Liners Used in High Pressure Vessels for Hydrogen Storage

et al. 2021

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A polyethylene (PE) liner is the basic element in high-pressure type 4 composite vessels designed for hydrogen or compressed natural gas (CNG) storage systems. Liner defects may result in the elimination of the whole vessel from use, which is very expensive, both at the manufacturing and exploitation stage. The goal is, therefore, the development of efficient non-destructive testing (NDT) methods to test a liner immediately after its manufacturing, before applying a composite reinforcement. It should be noted that the current regulations, codes and standards (RC&S) do not specify liner testing methods after manufacturing. It was considered especially important to find a way of locating and assessing the size of air bubbles and inclusions, and the field of deformations in liner walls. It was also expected that these methods would be easily applicable to mass-produced liners. The paper proposes the use of three optical methods, namely, visual inspection, digital image correlation (DIC), and optical fiber sensing based on Bragg gratings (FBG). Deformation measurements are validated with finite element analysis (FEA). The tested object was a prototype of a hydrogen liner for high-pressure storage (700 bar). The mentioned optical methods were used to identify defects and measure deformations.

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Section: Fiber Optical Sensors-fiber Bragg Gratingsmentioning

confidence: 99%

Validation of Selected Optical Methods for Assessing Polyethylene (PE) Liners Used in High Pressure Vessels for Hydrogen Storage

et al. 2021

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“…Different techniques are employed to compensate the temperature effect on the grating that measures strain 27 , 28 . In the device presented here, a second reference grating that was only connected to the package at one end was used to compensate the temperature and package effect due to the thermal expansion.…”

Section: Fibre Bragg Gratingsmentioning

confidence: 99%

Design, Construction and Validation of an Electrical Impedance Probe with Contact Force and Temperature Sensors Suitable for in-vivo Measurements

Ruiz-Vargas

Ivorra

Arkwright

2018

Sci Rep

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Bioimpedance spectroscopy measurements can be used for tissue characterization. These measurements can be performed in soft tissues by direct contact of a non-invasive probe consisting of two or four electrodes. The amount of force applied by users can be quite different, and the measurements can vary as a result. To compensate for this, we have built an electrical impedance probe (diameter 3.2 mm) with fibre optic contact-force and temperature sensors built in it. The different sensors of the probe were tested individually. The errors in magnitude and phase angle of the probe are <0.9% and <4°, respectively, for a 0.9% NaCl solution. The linear dynamic range of the force sensor was from 0 to 100 grams. An ex-vivo experiment on a section of proximal colon from a guinea-pig was performed. Twenty bioimpedance measurements were taken in a frequency range of 5 kHz to 1 MHz, while simultaneously recording the force applied. For an increase in contact pressure applied to tissue from 0 to 15.4 kPa, the maximum change in resistivity was 33% at 5 kHz and the minimum was 6.6% at 142 kHz. The probe is small enough to be introduced via the instrument port of an endoscope.

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“…Temperature error is one of the main errors of the strain sensor [10][11][12]. The airdrop height will vary from hundreds of meters to thousands of meters, so that the temperature will change in a wide range.…”

Section: Temperature Error Compensationmentioning

confidence: 99%

“…In Equation (12), t is the current evolution algebra, c 1 and c 2 are the nonnegative factors, ω is the inertia weight, λ is the speed factor, and r 1 and r 2 are the random numbers within [0,1]. We set D = 2, M = 25, c 1 , c 2 = 2,0 8 , and λ = 1.…”

Section: Journal Of Sensorsmentioning

confidence: 99%

Research and Application of Heavy-Equipment Parachute Rope Tension Sensor

et al. 2018

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Heavy-equipment airdrops are mainly used to deliver relief supplies and heavy weapons. Given the heavy weight of the goods, the tension of the extraction and brake ropes of the parachute significantly affects the safety of the aircraft. On the basis of the measurement and installation characteristics of the parachute rope, this study designed the structure of a nondestructive pressure-type parachute rope tension sensor and set the location of the strain gauge patch using the ANSYS simulation software to obtain a high sensor sensitivity. The temperature error of the tension sensor is compensated, and the precision is improved using the LSSVM-PSO (Least Squares Support Vector Machine-Particle Swarm Optimization) algorithm. The developed tension sensor is applied to the extraction parachute test system to measure the traction of 2 and 8 m2 parachutes. Test results show that the maximum weight of the platform these two parachutes can draw and the effect of parachute opening can be calculated.

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Analysis, compensation, and correction of temperature effects on FBG strain sensors

Cited by 10 publications

References 0 publications

Validation of Selected Optical Methods for Assessing Polyethylene (PE) Liners Used in High Pressure Vessels for Hydrogen Storage

Validation of Selected Optical Methods for Assessing Polyethylene (PE) Liners Used in High Pressure Vessels for Hydrogen Storage

Design, Construction and Validation of an Electrical Impedance Probe with Contact Force and Temperature Sensors Suitable for in-vivo Measurements

Research and Application of Heavy-Equipment Parachute Rope Tension Sensor

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