Relative Humidity Sensor Based on Cascaded Long-Period Gratings With Hydrogel Coatings and Fourier Demodulation

Yu, Xiaoxiao; Childs, Paul; Zhang, Min; Liao, Yanbiao; Ju, Jian; Jin, Wei

doi:10.1109/lpt.2009.2034620

Cited by 27 publications

(6 citation statements)

References 11 publications

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“…332,333 When hydrogel-coated cascaded LPG was used to develop an RH sensor that was based on Mach-Zehnder interference, it showed a sensitivity of 9.9 Â 10 À3 per % RH and an accuracy of 0.39% RH. 334 However, the linear performance range for this sensing setup was smaller (60% RH to 100% RH), and the accuracy decreased below the range. In another attempt, two different configurations, e.g., hydrogel coating of the entire length and hydrogel coating of the separation section between two LPGs, were attempted for a sensing system.…”

Section: Humidity Sensorsmentioning

confidence: 81%

Hydrogel-integrated optical fiber sensors and their applications: a comprehensive review

et al. 2023

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Section: Humidity Sensorsmentioning

confidence: 81%

Hydrogel-integrated optical fiber sensors and their applications: a comprehensive review

et al. 2023

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“…So far, the coated LPFG has been extensively explored and shown great potential in RH monitoring. Polyvinyl alcohol [45][46][47], PAH/PAA [48,49], hydrogel [50], gelatin [51,52], and calcium chloride [53] are the five typical materials used in coating the LPFG for humidity measurement. M. Fu [53] developed an LPFG humidity sensor with a sensitivity of 1.36 nm/1% RH by adopting fiber etching methods to produce an air gap in optical fiber, as Polyvinyl alcohol [45][46][47], PAH/PAA [48,49], hydrogel [50], gelatin [51,52], and calcium chloride [53] are the five typical materials used in coating the LPFG for humidity measurement.…”

Section: Rhmentioning

confidence: 99%

“…Polyvinyl alcohol [45][46][47], PAH/PAA [48,49], hydrogel [50], gelatin [51,52], and calcium chloride [53] are the five typical materials used in coating the LPFG for humidity measurement. M. Fu [53] developed an LPFG humidity sensor with a sensitivity of 1.36 nm/1% RH by adopting fiber etching methods to produce an air gap in optical fiber, as Polyvinyl alcohol [45][46][47], PAH/PAA [48,49], hydrogel [50], gelatin [51,52], and calcium chloride [53] are the five typical materials used in coating the LPFG for humidity measurement. M. Fu [53] developed an LPFG humidity sensor with a sensitivity of 1.36 nm/1% RH by adopting fiber etching methods to produce an air gap in optical fiber, as shown in Figure 8.…”

Section: Rhmentioning

confidence: 99%

Fiber Optic-Based Durability Monitoring in Smart Concrete: A State-of-Art Review

Qiao,

Lin,

Sun

et al. 2023

Sensors

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Concrete is the most commonly used construction material nowadays. With emerging cutting-edge technologies such as nanomaterials (graphene, carbon nanotubes, etc.), advanced sensing (fiber optics, computer tomography, etc.), and artificial intelligence, concrete can now achieve self-sensing, self-healing, and ultrahigh performance. The concept and functions of smart concrete have thus been partially realized. However, due to the wider application location (coastal areas, cold regions, offshore, and deep ocean scenarios) and changing climate (temperature increase, more CO2 emissions, higher moisture, etc.), durability monitoring (pH, ion penetration, carbonation, corrosion, etc.) becomes an essential component for smart concrete. Fiber optic sensors (FOS) have been widely explored in recent years for concrete durability monitoring due to their advantages of high sensitivity, immunity to harsh environments, small size, and superior sensitivity. The purpose of this review is to summarize FOS development and its application in concrete durability monitoring in recent years. The objectives of this study are to (1) introduce the working principle of FOS, including fiber Bragg grating (FBG), long-period fiber grating (LPFG), surface plasmon resonance (SPR), fluorescence-based sensors, and distributed fiber optic sensors (DFOS); (2) compare the sensitivity, resolution, and application scenarios of each sensor; and (3) discuss the advantages and disadvantages of FOS in concrete durability monitoring. This review is expected to promote technical development and provide potential research paths in the future for FOS in durability monitoring in smart concrete.

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“…Xiujuan Yu et al [ 57 ] investigated cascaded LPFG with hydrogel coatings and Fourier demodulation. The LOD is 0.39%RH, while the sensitivity is 9.9 × 10 −3 a.u./%RH between 60%RH and 100%RH.…”

Section: Literature and The State-of-the-artmentioning

confidence: 99%

Review of Optical Humidity Sensors

Rao

Zhao

et al. 2021

Sensors

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Optical humidity sensors have evolved through decades of research and development, constantly adapting to new demands and challenges. The continuous growth is supported by the emergence of a variety of optical fibers and functional materials, in addition to the adaptation of different sensing mechanisms and optical techniques. This review attempts to cover the majority of optical humidity sensors reported to date, highlight trends in design and performance, and discuss the challenges of different applications.

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Relative Humidity Sensor Based on Cascaded Long-Period Gratings With Hydrogel Coatings and Fourier Demodulation

Cited by 27 publications

References 11 publications

Hydrogel-integrated optical fiber sensors and their applications: a comprehensive review

Hydrogel-integrated optical fiber sensors and their applications: a comprehensive review

Fiber Optic-Based Durability Monitoring in Smart Concrete: A State-of-Art Review

Review of Optical Humidity Sensors

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