Impact of the Fiber Coating on the Temperature Response of Distributed Optical Fiber Sensors at Cryogenic Ranges

Lu, Xiaofei; Soto, Marcelo A.; Thévenaz, Luc

doi:10.1109/jlt.2017.2757843

Cited by 40 publications

(18 citation statements)

References 27 publications

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“…This results from a positive pressure forming on the SiO 2 component of the core glass as the temperature is increased. Similarly, and as discussed previously, the fiber could be coated in a material that strains the silica as the temperature is increased and thereby enhancing the thermal sensitivity [106,107].…”

Section: Discussionmentioning

confidence: 89%

“…Deviation from them depends on the absolute fiber configuration, coating, and glass composition. For instance, it has been shown [106,107] that one can enhance the thermal sensitivity with a coating of high coefficient of thermal expansion (CTE). Going in the other direction, a reversal of the sign of the thermal response was demonstrated by using a high-CTE core cladded in low-CTE silica [34].…”

Section: The Materialsmentioning

confidence: 99%

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A Brief Review of Specialty Optical Fibers for Brillouin-Scattering-Based Distributed Sensors

Dragic

Ballato

2018

Applied Sciences

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Specialty optical fibers employed in Brillouin-based distributed sensors are briefly reviewed. The optical and acoustic waveguide properties of silicate glass optical fiber first are examined with the goal of constructing a designer Brillouin gain spectrum. Next, materials and their effects on the relevant Brillouin scattering properties are discussed. Finally, optical fiber configurations are reviewed, with attention paid to fibers for discriminative or other enhanced sensing configurations. The goal of this brief review is to reinforce the importance of fiber design to distributed sensor systems, generally, and to inspire new thinking in the use of fibers for this sensing application.

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Section: Discussionmentioning

confidence: 89%

Section: The Materialsmentioning

confidence: 99%

A Brief Review of Specialty Optical Fibers for Brillouin-Scattering-Based Distributed Sensors

Dragic

Ballato

2018

Applied Sciences

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“…Unlike PDMS, which is mostly used for temperature measurement, polyimide is mostly used for humidity measurement while measuring temperature. With a strong structural strength, polyimide can still exist stably in an environment of 400 °C and can be used for a long time in the temperature range of −200 to 300 °C [ 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 ].…”

Section: Sensors Coated With Polyimide Acrylate and Materials Fomentioning

confidence: 99%

A Review of Coating Materials Used to Improve the Performance of Optical Fiber Sensors

Yang

Wang

et al. 2020

Sensors

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In order to improve the performance of fiber sensors and fully tap the potential of optical fiber sensors, various optical materials have been selectively coated on optical fiber sensors under the background of the rapid development of various optical materials. On the basis of retaining the original characteristics of the optical fiber sensors, the coated sensors are endowed with new characteristics, such as high sensitivity, strong structure, and specific recognition. Many materials with a large thermal optical coefficient and thermal expansion coefficients are applied to optical fibers, and the temperature sensitivities are improved several times after coating. At the same time, fiber sensors have more intelligent sensing capabilities when coated with specific recognition materials. The same/different kinds of materials combined with the same/different fiber structures can produce different measurements, which is interesting. This paper summarizes and compares the fiber sensors treated by different coating materials.

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“…(12) Note that the sensing fiber used in a φOTDR system is usually modelled as an ultra-long but weak random grating with arbitrary pitches [13], [14] due to the random refractive index fluctuations along the fiber, and the Rayleigh backscattering can be seen as the light reflected at the interface of two adjacent inhomogeneities. As a result, the reflection coefficient can be straightforwardly obtained using the Fresnel reflection law, assuming the light is normally incident, based on refractive index variations along the fiber.…”

Section: Numerical Modelmentioning

confidence: 99%

Spectral Properties of the Signal in Phase-Sensitive Optical Time-Domain Reflectometry With Direct Detection

Soto

Zhang

et al. 2020

J. Lightwave Technol.

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The spectral properties of the Rayleigh backscattered traces measured by a phase-sensitive optical time-domain reflectometer (φOTDR) with direct detection are theoretically and experimentally analyzed. The spectrum of the measured φOTDR signal is found to be strictly dependent on the spectral shape of the probing optical pulse. Furthermore, the visibility, spatial resolution, fading rate, and correlation spectrum of the traces are analyzed using different detection bandwidths. Results point out that the quality of φOTDR traces and target spatial resolution are secured only if the electrical bandwidth of the photodetector is broad enough to cover at least 80% of the total power contained in the electrical spectral density function of the measured trace. This means that in the case of using direct detection of the Rayleigh backscattered light induced by rectangular-shaped optical pulses, the minimum bandwidth required for a proper detection of the traces is equal to the reciprocal of the pulse temporal width (which is larger than the pulse spectral width). Although the theoretical analysis and numerical simulations are here experimentally validated for rectangular and sinc-shaped optical pulses, the results and methodology presented in this article can be applied to optimize the direct-detection bandwidth of φOTDR sensors using any optical pulse shape.

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Impact of the Fiber Coating on the Temperature Response of Distributed Optical Fiber Sensors at Cryogenic Ranges

Cited by 40 publications

References 27 publications

A Brief Review of Specialty Optical Fibers for Brillouin-Scattering-Based Distributed Sensors

A Brief Review of Specialty Optical Fibers for Brillouin-Scattering-Based Distributed Sensors

A Review of Coating Materials Used to Improve the Performance of Optical Fiber Sensors

Spectral Properties of the Signal in Phase-Sensitive Optical Time-Domain Reflectometry With Direct Detection

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