Humidity sensor based on unsymmetrical U-shaped twisted microfiber coupler with wide detection range

Peng, Yun; Zhao, Yong; Hu, Xu-guang; Chen, Mao-qing

doi:10.1016/j.snb.2019.04.017

Cited by 27 publications

(11 citation statements)

References 23 publications

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“…The resulting tapered SMF coupler has been used for sensing applications, including temperature [226][227], RI [228][229][230], strain [231], liquid flow rate [232] and magnetic field sensing [233][234][235][236][237] etc. The functionalization of tapered SMF couplers enables the sensors to be used to detect bio-chemical materials, such as humidity [238][239], ammonia [240], ethanol [241], human cardiac troponin, in which the Vernier effect was utilized to improve sensor sensitivity [242], airborne contaminants [243], myocardial infarction I [244].…”

Section: B Tapered Sms Fiber Couplermentioning

confidence: 99%

Singlemode-Multimode-Singlemode Fiber Structures for Sensing Applications—A Review

Liu

et al. 2021

IEEE Sensors J.

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A singlemode-multimode-singlemode (SMS) fiber structure consists of a short section of multimode fiber fusionspliced between two SMS fibers. The mechanism underpinning the operation of an SMS fiber structure is multimode interference and associated self-imaging. SMS structures can be used in a variety of optical fiber systems but are most commonly used as sensors for a variety of parameters, ranging from macro-world measurands such as temperature, strain, vibration, flow rate, RI and humidity to the micro-world with measurands such as proteins, pathogens, DNA, and specific molecules. While traditional SMS structures employ a short section of standard multimode fiber, a large number of structures have been investigated and demonstrated over the last decade involving the replacement of the multimode fiber section with alternatives such as a hollow core fiber or a tapered fiber. The objective of replacing the multimode fiber has most often been to allow sensing of different measurands or to improve sensitivity. In this paper, several different categories of SMS fiber structures, including traditional SMS, modified SMS and tapered SMS fiber structures are discussed with some theoretical underpinning and reviews of a wide variety of sensing examples and recent advances. The paper then summarizes and compares the performances of a variety of sensors which have been published under a number of headings. The paper concludes by considering the challenges faced by SMS based sensing schemes in terms of their deployment in real world applications and discusses possible future developments of SMS fiber sensors.

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Section: B Tapered Sms Fiber Couplermentioning

confidence: 99%

Singlemode-Multimode-Singlemode Fiber Structures for Sensing Applications—A Review

Liu

et al. 2021

IEEE Sensors J.

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“…This feature is caused by the larger evanescent fields in smaller dimensions or reduced RI contrast, indicating that microfiber sensors with smaller diameters would benefit sensing applications. To date, MFCs have been widely demonstrated in the sensing of RIs [96,100,182], temperature [72,75,183,184], strain/force [97], current [94], magnetic fields [94,176], humidity [169,185,186], and other parameters. Most of the reported MFC RI sensors exhibited sensitivities in the range of 1 000 nm/RIU -6 000 nm/RIU (RI unit) [93,95,96,187,188].…”

Section: Phase-based Sensorsmentioning

confidence: 99%

Recent Progress in Microfiber-Optic Sensors

Luo

Chen

2021

Photonic Sens

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Recently, microfiber-optic sensors with high sensitivity, fast response times, and a compact size have become an area of interest that integrates fiber optics and nanotechnology. Distinct advantages of optical microfiber, such as large accessible evanescent fields and convenient configurability, provide attractive benefits for micro- and nano-scale optical sensing. Here, we review the basic principles of microfiber-optic sensors based on a broad range of microstructures, nanostructures, and functional materials. We also introduce the recent progress and state-of-the-art in this field and discuss the limitations and opportunities for future development.

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“…A polyvinyl alcohol (PVA) polymer was employed as an absorber of relative humidity to realize a MKR-based relative humidity sensor [29,30,48,49,50,51,52,53,54]. FM-MKR with two modes ( HE 11 and HE 12 ) was fabricated by using a flame-blushing method [29].…”

Section: Relative Humidity Sensors Based On Mkrs With Sensitive Mamentioning

confidence: 99%

Relative Humidity Sensors Based on Microfiber Knot Resonators—A Review

Han

2019

Sensors

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Recent research and development progress of relative humidity sensors using microfiber knot resonators (MKRs) are reviewed by considering the physical parameters of the MKR and coating materials sensitive to improve the relative humidity sensitivity. The fabrication method of the MKR based on silica or polymer is briefly described. The many advantages of the MKR such as strong evanescent field, a high Q-factor, compact size, and high sensitivity can provide a great diversity of sensing applications. The relative humidity sensitivity of the MKR is enhanced by concerning the physical parameters of the MKR, including the waist or knot diameter, sensitive materials, and Vernier effect. Many techniques for depositing the sensitive materials on the MKR surface are discussed. The adsorption effects of water vapor molecules on variations in the resonant wavelength and the transmission output of the MKR are described regarding the materials sensitive to relative humidity. The sensing performance of the MKR-based relative humidity sensors is discussed, including sensitivity, resolution, and response time.

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Humidity sensor based on unsymmetrical U-shaped twisted microfiber coupler with wide detection range

Cited by 27 publications

References 23 publications

Singlemode-Multimode-Singlemode Fiber Structures for Sensing Applications—A Review

Singlemode-Multimode-Singlemode Fiber Structures for Sensing Applications—A Review

Recent Progress in Microfiber-Optic Sensors

Relative Humidity Sensors Based on Microfiber Knot Resonators—A Review

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