Humidity Sensor Based on Fabry–Perot Interferometer and Intracavity Sensing of Fiber Laser

Shi, Jia; Xu, Degang; Xu, Wei; Wang, Yuye; Yan, Chao; Zhang, Chao; Yan, Dexian; He, Yixin; Tang, Longhuang; Zhang, Weihong; Liu, Tiegen; Yao, Jianquan

doi:10.1109/jlt.2017.2750172

Cited by 41 publications

(13 citation statements)

References 34 publications

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“…Two major mechanisms underpin these types of sensors. The first utilises fairly standard spectroscopic techniques, in which the gas absorbs incident optical radiation at specific wavelengths [19,20]. The second is a direct interaction of the evanescent field that exists at the boundary interface between the waveguide (supporting guided, leaky mode, or both) and the surrounding medium, in this case, the optical fibre, the waveguide, and the surrounding medium of the gas.…”

Section: Spectroscopic Optical Fibre Sensorsmentioning

confidence: 99%

“…This review will focus on optical fibre sensor groups that have been researched and investigated. There are many types of fibre optic sensors that are being developed and studied at present, but we will classify the sensors into several groups, listed as follows: Group 1-optical fibre spectroscopic sensors, consisting of intra cavity, external cavity, photonic crystal fibre (PCF) and surface enhanced Raman spectroscopy (SERS) [19][20][21][22][23][24][25][26]. Group 2-fibre grating sensors, including long period gratings, Bragg gratings, and tilted Bragg gratings [27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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A Review: Application and Implementation of Optic Fibre Sensors for Gas Detection

Allsop

Neal

2021

Sensors

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At the present time, there are major concerns regarding global warming and the possible catastrophic influence of greenhouse gases on climate change has spurred the research community to investigate and develop new gas-sensing methods and devices for remote and continuous sensing. Furthermore, there are a myriad of workplaces, such as petrochemical and pharmacological industries, where reliable remote gas tests are needed so that operatives have a safe working environment. The authors have concentrated their efforts on optical fibre sensing of gases, as we became aware of their increasing range of applications. Optical fibre gas sensors are capable of remote sensing, working in various environments, and have the potential to outperform conventional metal oxide semiconductor (MOS) gas sensors. Researchers are studying a number of configurations and mechanisms to detect specific gases and ways to enhance their performances. Evidence is growing that optical fibre gas sensors are superior in a number of ways, and are likely to replace MOS gas sensors in some application areas. All sensors use a transducer to produce chemical selectivity by means of an overlay coating material that yields a binding reaction. A number of different structural designs have been, and are, under investigation. Examples include tilted Bragg gratings and long period gratings embedded in optical fibres, as well as surface plasmon resonance and intra-cavity absorption. The authors believe that a review of optical fibre gas sensing is now timely and appropriate, as it will assist current researchers and encourage research into new photonic methods and techniques.

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Section: Spectroscopic Optical Fibre Sensorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Review: Application and Implementation of Optic Fibre Sensors for Gas Detection

Allsop

Neal

2021

Sensors

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“…A year later, Shi et al [ 55 ] introduced the method of combining the FRL and FPI into the area of humidity measuring. According to their paper, though the traditional fiber-optic humidity sensors have the merit of high sensitivity and anti-electromagnetic interference, most of them are lack of remote detection ability due to the broadband light source used in their sensing system which will cause a wide bandwidth and low peak intensity.…”

Section: Sensing Applicationsmentioning

confidence: 99%

Optical Fiber Sensors Based on Fiber Ring Laser Demodulation Technology

Xie

Zhang

Wang

et al. 2018

Sensors

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A review for optical fiber sensors based on fiber ring laser (FRL) demodulation technology is presented. The review focuses on the principles, main structures, and the sensing performances of different kinds of optical fiber sensors based on FRLs. First of all, the theory background of the sensors has been discussed. Secondly, four different types of sensors are described and compared, which includes Mach–Zehnder interferometer (MZI) typed sensors, Fabry–Perot interferometer (FPI) typed sensors, Sagnac typed sensors, and fiber Bragg grating (FBG) typed sensors. Typical studies and main properties of each type of sensors are presented. Thirdly, a comparison of different types of sensors are made. Finally, the existing problems and future research directions are pointed out and analyzed.

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“…The high OSNR in FRLs enables remote detection of a particular target measurement at long distance and improves the detection accuracy. Due to high OSNR, low spectral width and high intensity FRLs are of great research interest [20][21][22][23][24][25][26][27][28][29][30]. Different structures had been proposed within FRL setups for sensing applications, i.e.…”

mentioning

confidence: 99%

“…interferometers, i.e. Mach-Zehnder [20,21], Fabry-Pérot [22,23], Sagnac [24,25], and FBGs [26,27]. Shi et al presented a FRL sensor combined with a Fabry-Pérot interferometer (FPI) [28], where an Agarose film was deposited on the fiber to obtain sensitivity to humidity, yielding a sensitivity of 0.202 dB/%RH.…”

mentioning

confidence: 99%

Simultaneous Measurement of Temperature and Relative Humidity Using a Dual-Wavelength Erbium-Doped Fiber Ring Laser Sensor

et al. 2019

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A fiber ring laser sensor setup utilizing FBGs (Fiber Bragg Gratings) for simultaneous measurement of ambient temperature and relative humidity (RH) is presented. Two FBGs are incorporated as tunable filters for a dual-wavelength laser emission, where one FBG was coated with Polyimide (PI) in order to achieve sensitivity to RH changes, while the other bare FBG was used for temperature sensing. An increase in RH would induce a strain on the grating, which results in a variation in the resonance wavelength of the PI-coated FBG. This causes a shift in the laser emission wavelength. Being insensitive to RH changes, the bare FBG was employed to measure temperature. The dual-wavelength fiber ring laser sensor created thus allows to determine simultaneous measurement of RH and temperature. The RH sensitivities observed by the PI coated FBG to RH and temperature are 3.6 pm/%RH and 12.15 pm/°C respectively. The temperature sensitivity of the bare FBG was observed to be 9.6 pm/°C. The main advantage of the proposed setup is an optical signal to noise ratio (OSNR) higher than 55 dB and a 3 dBbandwidth less than 0.02 nm, which points out efficient capabilities for both precise sensing and remote detection applications.

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Humidity Sensor Based on Fabry–Perot Interferometer and Intracavity Sensing of Fiber Laser

Cited by 41 publications

References 34 publications

A Review: Application and Implementation of Optic Fibre Sensors for Gas Detection

A Review: Application and Implementation of Optic Fibre Sensors for Gas Detection

Optical Fiber Sensors Based on Fiber Ring Laser Demodulation Technology

Simultaneous Measurement of Temperature and Relative Humidity Using a Dual-Wavelength Erbium-Doped Fiber Ring Laser Sensor

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