Chitosan-Coated Polarization Maintaining Fiber-Based Sagnac Interferometer for Relative Humidity Measurement

Chen, Li Han; Chan, Chi Chiu; Tao, Li; Shaillender, M.; Neu, Björn; Balamurali, P.; Menon, Rajesh; Zu, Peng; Ang, Xiu Min; Wong, Wei Chang; Poh, Chueh Loo; Leong, K. C.

doi:10.1109/jstqe.2012.2194729

Cited by 37 publications

(3 citation statements)

References 22 publications

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“…Li Han Chen et al [ 74 ] applied the same chitosan coating strategy to a polarization-maintaining fiber-based Sagnac interferometer. A detection of 2.04%RH was reported.…”

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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“…Li Han Chen et al [ 74 ] applied the same chitosan coating strategy to a polarization-maintaining fiber-based Sagnac interferometer. A detection of 2.04%RH was reported.…”

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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show abstract

“…Different fiber sensing structures have been combined with polymer coatings. For instance, the use of fiber Bragg gratings [23], bended fibers [24], side-polished fibers [25,26], photonic crystal fibers [20,27], tapered fibers [13,15,16], Fabry-Perot cavities [28], Sagnac interferometers [29], hollow core fibers [15], and single-mode hetero-core fibers [14,30] have been proposed to detect environmental RH variations.…”

Section: Introductionmentioning

confidence: 99%

Relative Humidity Fiber Sensor Based on Multimode Interferometer Coated with Agarose-Gel

2018

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In this work, a relative humidity (RH) sensor based on a structure with multimode interference is proposed and experimentally demonstrated. The multimode sensor is fabricated by fusion splicing a coreless fiber section to a single mode fiber. A hydrophilic agarose gel is coated on the coreless fiber, using the dip coating technique. By changing the surrounding RH, the refractive index of the coated agarose gel will change, causing a wavelength shift of the peak in the reflection spectra. For RH variations in the range between 60.0%RH and 98.5%RH, the sensor presents a maximum sensitivity of 44.2 pm/%RH, and taking in consideration the interrogation system, a resolution of 0.5%RH is acquired. This sensor has a great potential in real time RH monitoring and can be of interest for applications where a control of high levels of relative humidity is required.Coatings 2018, 8, 453 2 of 9 and desorb water, and also to restore a fast equilibrium with atmospheric humidity. Besides that, it is extremely stable, not soluble in water and can be easily handled for device manufacture [23,31].In this work, a multimode interferometer based on a coreless fiber coated with agarose gel is proposed for the detection of RH. The sensor is easy to produce, presents good resolution, particularly for environments with values of RH higher than 60.0%RH. Sensor Fabrication and Operation Principle

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“…A variety of fiber humidity sensors have been demonstrated based on different fiber types and configurations, including tapered fibers [1], bent fibers [2], polarizationmaintaining fibers [3,4], fiber gratings [5][6][7][8] and no-core fibers [9]. These sensors' performances mainly depend on a hygroscopic coating or thin film which is humidity-sensitive and coated on the fiber structures.…”

Section: Introductionmentioning

confidence: 99%

Temperature-insensitive photonic crystal fiber interferometer for relative humidity sensing without hygroscopic coating

Noor¹,

Kassim²,

Supa’at³

et al. 2013

Meas. Sci. Technol.

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A novel photonic crystal fiber (PCF) interferometer RH (relative humidity) sensor is proposed and demonstrated in this paper. The sensor is made from a piece of PCF spliced to standard fibers in transmission mode, which has the advantage that it does not require the use of any hygroscopic thin film or layer. In addition, the all-silica nature of the sensing element means the sensor is insensitive to temperature. The sensor has a humidity sensitivity of 60.3 pm/%RH over the range of 60–80% RH and 188.3 pm/%RH in the region from 80 to 95% RH. A response time around ∼1 s is observed for a ∼2 cm long section of photonic crystal fiber interferometer (PCFI). The sensor exhibits a very low cross temperature sensitivity of around 0.5 pm/°C. The proposed sensor has potential for high humidity monitoring applications, and temperature compensation is not necessary if such a sensor is operated in normal surrounding atmosphere.

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Chitosan-Coated Polarization Maintaining Fiber-Based Sagnac Interferometer for Relative Humidity Measurement

Cited by 37 publications

References 22 publications

Review of Optical Humidity Sensors

Review of Optical Humidity Sensors

Relative Humidity Fiber Sensor Based on Multimode Interferometer Coated with Agarose-Gel

Temperature-insensitive photonic crystal fiber interferometer for relative humidity sensing without hygroscopic coating

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