A high response polyimide fiber optic sensor for distributed humidity measurements

Thomas, Peter J.; Hellevang, Jon O.

doi:10.1016/j.snb.2018.05.011

Cited by 54 publications

(30 citation statements)

References 18 publications

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“…The sensitivity of such sensors is clearly dependent on the properties of the coating material, i.e., the expansion coefficient to the target analyte, the Young’s modulus, and the cross-sectional area [80]. Higher values of those parameters usually lead to an improved sensitivity.…”

Section: Overview Of Sensing Mechanisms For Dcsmentioning

confidence: 99%

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A Review of Methods for Fibre-Optic Distributed Chemical Sensing

Thomas

Hellevang

2019

Sensors

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Chemical sensing is of great importance in many application fields, such as medicine, environmental monitoring, and industrial process control. Distributed fibre-optic sensing received significant attention because of its unique feature to make spatially resolved measurements along the entire fibre. Distributed chemical sensing (DCS) is the combination of these two techniques and offers potential solutions to real-world applications that require spatially dense chemical measurements covering large length scales. This paper presents a review of the working principles, current status, and the emerging trends within DCS.

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Section: Overview Of Sensing Mechanisms For Dcsmentioning

confidence: 99%

“…( b ) Normalised strain response of polyimide-coated fibres with different thickness when the relative humidity changed from 15% to 30%. Modified with permission from Reference [80].…”

Section: Figurementioning

confidence: 99%

A Review of Methods for Fibre-Optic Distributed Chemical Sensing

Thomas

Hellevang

2019

Sensors

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“…Though, silica fibers with a thicker polyimide cladding demonstrate increased strain responses compared to the PFGI-POF (up to 38.5

%r.h. −1 for 876

m cladding thickness [ 35 ]).…”

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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“…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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A high response polyimide fiber optic sensor for distributed humidity measurements

Cited by 54 publications

References 18 publications

A Review of Methods for Fibre-Optic Distributed Chemical Sensing

A Review of Methods for Fibre-Optic Distributed Chemical Sensing

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

A Lossless Fiber Pressure Sensor Based on PDMS

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