A humidity fiber sensor based on both end-sides of a fiber Bragg grating coated with polyimide

Xie, Zhanwu; Yan, Haitao; Li, Yanfei; Zhao, Xiaoxiao

doi:10.1016/j.yofte.2020.102220

Cited by 20 publications

(3 citation statements)

References 20 publications

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“…While our system has greater radiation resistance, stability and durability, etc. [19] It can also operate normally for a long period of time under a temperature of 300 • C [20,21] and four hours at 350 • C, meaning that it is suitable for use in high temperatures and harsh environments. There are two interlaced grating arrays, each of 084204-3 which is divided into three groups, as shown in Fig.…”

Section: Grating Array Designmentioning

confidence: 99%

Optical fiber FBG linear sensing systems for the on-line monitoring of airborne high temperature air duct leakage

Wang¹,

Tong²,

Zhang³

et al. 2022

Chinese Phys. B

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Electrical Sensing System, such as those involving eutectic salt, are mostly used in connection to leakage from existing airborne high-temperature air-conducting pipelines. Such complex structured systems are susceptible to external interferences and, thus, cannot meet the increasingly strict monitoring needs of a complex air-conducting pipeline system of an aircraft. In view of this, this paper studies an alternative sensor system based on a dense array fiber grating. To obtain a compact and light-weight airborne signal processing system, a field programmable gate array is used as the main control core that controls the output of the light source. The functions of pulse modulation, analog-to-digital conversion, data buffering and transmission are integrated into a single system, while linear sensing monitoring is obtained by detecting the time-division and wavelength-division wavelength drift signals of the fiber Bragg grating array. Our experiments show that the spatial resolution of the linear sensing system approaches 5 cm, the temperature measurement accuracy reaches 2 ℃, the temperature measurement range is between 0-250 ℃, and the response time is within 4 s. Compared with the existing electrical monitoring system, various monitoring indicators have been greatly improved and have broad application prospects.

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Section: Grating Array Designmentioning

confidence: 99%

Optical fiber FBG linear sensing systems for the on-line monitoring of airborne high temperature air duct leakage

Wang¹,

Tong²,

Zhang³

et al. 2022

Chinese Phys. B

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“…Recently, similar attempts have been made for a higher sensitivity and a shorter breathing time, which are hard to achieve simultaneously with an ordinary polyimide film in a conventional structure. The reason lies in the tough hydrogen bonding in polyimide with a porous surface, which causes humidity hysteresis and even moisture agglomeration [ 24 , 25 ]. Moreover, the moisture exchange and humidity sensitivity are restricted with each other depending on the tradeoff between film thickness and surface, where it is difficult to balance the response time and accuracy.…”

Section: Introductionmentioning

confidence: 99%

Fluorinated Polyimide-Film Based Temperature and Humidity Sensor Utilizing Fiber Bragg Grating

Luo

Liu

et al. 2020

Sensors

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We propose and demonstrate a temperature and humidity sensor based on a fluorinated polyimide film and fiber Bragg grating. Moisture-induced film expansion or contraction causes an extra strain, which is transferred to the fiber Bragg grating and leads to a humidity-dependent wavelength shift. The hydrophobic fluoride doping in the polyimide film helps to restrain its humidity hysteresis and provides a short moisture breathing time less than 2 min. Additionally, another cascaded fiber Bragg grating is used to exclude its thermal crosstalk, with a temperature accuracy of ±0.5 °C. Experimental monitoring over 9000 min revealed a considerable humidity accuracy better than ±3% relative humidity, due to the sensitized separate film-grating structure. The passive and electromagnetic immune sensor proved itself in field tests and could have sensing applications in the electro-sensitive storage of fuel, explosives, and chemicals.

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“…According to the sensor's working principle, fiber optic RH sensors are categorized into gratings, interferometers, modal interferometers, loss mode resonances (LMRs), and optical absorption [4]. Gratings have unique spectral characteristics, combined with different hydrophilic materials, which increase the system's stability and sensitivity [5][6][7][8][9]. However, these sensors are cross-sensitive to temperature and strain, limiting the measurement accuracy.…”

Section: Introductionmentioning

confidence: 99%

A Micro Structure POF Relative Humidity Sensor Modified With Agarose Based on Surface Plasmon Resonance and Evanescent Wave Loss

Ghaffar

Hou

et al. 2020

Photonic Sens

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A novel high sensitivity relative humidity (RH) sensor was proposed by using micro structure plastic optical fiber (POF) based on the surface plasmon resonance (SPR) effect and the evanescent wave (EW) loss. The micro structure was fabricated on the POF and coated with a gold layer and agarose, adopting the sputtering and dip-coating technique. These construction effects on the attenuation of power caused by the SPR effect and the EW loss were used to perform RH detections. The agarose’s different refractive indexes (RIs) caused fluctuations in the transmission power when the humidity increased. The demonstrated experimental results showed that the proposed sensor achieved a linear response from 20% RH to 80% RH with a high sensitivity of 0.595µW/%. The proposed sensor had the advantages of fast response and recovery. Furthermore, the temperature dependence and the repeatability test of the sensor were also performed.

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A humidity fiber sensor based on both end-sides of a fiber Bragg grating coated with polyimide

Cited by 20 publications

References 20 publications

Optical fiber FBG linear sensing systems for the on-line monitoring of airborne high temperature air duct leakage

Optical fiber FBG linear sensing systems for the on-line monitoring of airborne high temperature air duct leakage

Fluorinated Polyimide-Film Based Temperature and Humidity Sensor Utilizing Fiber Bragg Grating

A Micro Structure POF Relative Humidity Sensor Modified With Agarose Based on Surface Plasmon Resonance and Evanescent Wave Loss

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