A fully distributed fibre optic sensor for relative humidity measurements

Thomas, Peter J.; Hellevang, Jon O.

doi:10.1016/j.snb.2017.02.027

Cited by 68 publications

(31 citation statements)

References 11 publications

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“…−1 and 0.2

%r.h. −1 , respectively [ 34 ]). Though, silica fibers with a thicker polyimide cladding demonstrate increased strain responses compared to the PFGI-POF (up to 38.5

%r.h.…”

Section: Fiber Characterizationmentioning

confidence: 99%

Investigation on the Influence of Humidity on Stimulated Brillouin Backscattering in Perfluorinated Polymer Optical Fibers

Schreier

Liehr

Wosniok

et al. 2018

Sensors

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In this paper perfluorinated graded-index polymer optical fibers are characterized with respect to the influence of relative humidity changes on spectral transmission absorption and Rayleigh backscattering. The hygroscopic and thermal expansion coefficient of the fiber are determined to be CHE = (7.4 ± 0.1) ·10−6 %r.h.−1 and CTE = (22.7 ± 0.3) ·10−6 K−1, respectively. The influence of humidity on the Brillouin backscattering power and linewidth are presented for the first time to our knowledge. The Brillouin backscattering power at a pump wavelength of 1319 nm is affected by temperature and humidity. The Brillouin linewidth is observed to be a function of temperature but not of humidity. The strain coefficient of the BFS is determined to be CS= (−146.5 ± 0.9) MHz/% for a wavelength of 1319 nm within a strain range from 0.1% to 1.5%. The obtained results demonstrate that the humidity-induced Brillouin frequency shift is predominantly caused by the swelling of the fiber over-cladding that leads to fiber straining.

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“…−1 and 0.2

%r.h. −1 , respectively [ 34 ]). Though, silica fibers with a thicker polyimide cladding demonstrate increased strain responses compared to the PFGI-POF (up to 38.5

%r.h.…”

Section: Fiber Characterizationmentioning

confidence: 99%

Investigation on the Influence of Humidity on Stimulated Brillouin Backscattering in Perfluorinated Polymer Optical Fibers

Schreier

Liehr

Wosniok

et al. 2018

Sensors

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“…Fiber optic sensing technology, which is a new type of sensing technology, is sensitive to environmental parameters, such as temperature [1], strain, pressure [2,3], and relative humidity [4,5]. The optical fiber sensors (OFS), which have proven their advantages of anti-electromagnetic interference, lightweight, small size, high sensitivity, and simplicity in realizing multiplexing or distributed sensing, OFS are ideal in the diverse environment, such as oil well development, bridge maintenance, address exploration, and deep-sea exploration.…”

Section: Introductionmentioning

confidence: 99%

A Lossless Fiber Pressure Sensor Based on PDMS

et al. 2020

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Fiber optic pressure sensors have been widely used in recent decades. Most of the fiber optic pressure sensors use fiber gratings and Fabry-Perot cavity. However, they have the drawbacks of in achieving distributed sensing. In this paper, a lossless fiber pressure sensor based on a structure composed of two ratios of the polydimethylsiloxane (PDMS) and single-mode fiber is proposed. The PDMS has often been used as a flexible structural material. When the pressure is acting radially on the PDMS, the internal fiber is driven to produce an axial strain of a larger range, and the optical frequency domain reflectometer (OFDR) is used to demodulate the fiber strain. The experimental results prove that the designed sensor has a repeatable response with a sensitivity of 17.519 με/N within the range of 20 N (2548 kPa). The minimum pressure resolution and spatial resolution of the sensor can reach values of 0.5 N and 0.5 cm, respectively. Compared to a single ratio PDMS sensor, which has a non-linear response to the pressure, the range is increased by about 1.4 times. Based on the obtained results, the proposed sensor has application prospects in pressure sensors.

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“…Secondly, the wavelength shift technique is immune to power fluctuation noise, when compared with the optical intensity technique [6,7,8,9,10,11,12,13]. The other techniques [14,15,16] are not used very often and are different from the usual methods, such as detecting phase shift of the light [14] or measuring the strain on the fiber [15]. As for wavelength-based techniques, the transmission spectrum can be used to monitor the RH change of the environment.…”

Section: Introductionmentioning

confidence: 99%

Humidity Sensor Based on a Long-Period Fiber Grating Coated with Polymer Composite Film

Wang

Liu

Zou

et al. 2019

Sensors

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We demonstrate a simple and highly sensitive optical fiber relative humidity (RH) sensor based on a long-period fiber grating (LPFG) coated with polyethylene glycol (PEG)/polyvinyl alcohol (PVA) composite films. The resonance wavelength of the LPFG is sensitive to environmental humidity due to the change in effective refractive index caused by the strong surface absorption and desorption of the porous PEG/PVA coatings. The sensor is sensitive in a wide range from 50% to 95% RH, with a highest sensitivity of 2.485 nm/%RH in the range 50–75% RH. The proposed RH sensor has the advantages of compact size, good reversibility, and stability, which makes it attractive for high-humidity environments.

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A fully distributed fibre optic sensor for relative humidity measurements

Cited by 68 publications

References 11 publications

Investigation on the Influence of Humidity on Stimulated Brillouin Backscattering in Perfluorinated Polymer Optical Fibers

Investigation on the Influence of Humidity on Stimulated Brillouin Backscattering in Perfluorinated Polymer Optical Fibers

A Lossless Fiber Pressure Sensor Based on PDMS

Humidity Sensor Based on a Long-Period Fiber Grating Coated with Polymer Composite Film

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