Research on temperature and humidity sensing characteristics of cascaded LPFG-FBG

Qi, Yuefeng; Jia, Cui; Tang, Li; Zhang, Xin; Gong, Chenbo; Liu, Yanyan; Liu, Xueqiang

doi:10.1016/j.ijleo.2019.05.043

Cited by 27 publications

(13 citation statements)

References 13 publications

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“…The carbon nanomaterials embedded are further combined with water molecules in the film to achieve the effect of double absorption of water. As shown in Figure S6, when the composite polymer absorbs water in the environment, the RI of the film becomes lower . Both ends of the PMF are overhead on the optical support.…”

Section: Resultsmentioning

confidence: 99%

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Simultaneous Real-Time Measurements of Temperature, Liquid Level, Humidity, and pH by ZnSe/Co Nanostructure-Coated Polymer Films

Wang

et al. 2022

ACS Appl. Nano Mater.

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In this work, the surface of long-period fiber grating (LPFG) and polarization maintaining fiber (PMF) is functionalized based on the interaction between the resonance wavelength and external environment. LPFG coated with a 150 nm ZnSe/Co film is fixed on a hollow bracket, prestressed, and annealed many times. A highly sensitive liquid level sensor with adjustable sensitivity, an adjustable measurement range, and a high liquid level early warning is prepared. The waveguide layer controlled by humidity is constructed by filling poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonate) (PEDOT/PSS) in a periodically etched PMF. The surface is coated with a poly(vinyl alcohol) (PVA) and carbon nanotube (CNT) composite polymer. After laser processing, a honeycomb porous film is obtained, and the humidity sensor with wavelength modulation is prepared. The pH-sensitive polymer is successively adsorbed on the surface of PMF coated with a 120 nm indium tin oxide (ITO) film by electrostatic self-assembly (ESA). Poly(allylamine hydrochloride) (PAH), poly(acrylic acid) (PAA), and poly(styrene sulfonate) (PSS) constitute a composite film with rapid deposition and high permeability that is covered with polyaniline/poly(methyl methacrylate) (PMMA) as the protective layer. After laser processing, a fluffy porous film structure is formed. The pH sensor is obtained and the preparation steps are greatly reduced. Finally, based on the wavelength division multiplexing (WDM) and multiwavelength matrix (MWM), the problem of crosstalk is solved. An integrated sensor is constructed to realize the simultaneous measurement of temperature, liquid level, humidity, and pH. It has been successfully applied to monitor the overall environment of a chemical waste liquid storage tank. The sensor has the advantages of remote monitoring, safety, efficiency, and labor-saving.

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Section: Resultsmentioning

confidence: 99%

“…As shown in Figure S6, when the composite polymer absorbs water in the environment, the RI of the film becomes lower. 38 Both ends of the PMF are overhead on the optical support. After absorbing water, the film is heavier and applies radial stress to the PMF.…”

Section: Humidity Measurement Of Pmf Amentioning

confidence: 99%

Simultaneous Real-Time Measurements of Temperature, Liquid Level, Humidity, and pH by ZnSe/Co Nanostructure-Coated Polymer Films

Wang

et al. 2022

ACS Appl. Nano Mater.

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“…It is also plotted in Figure -(2) with the same wavlength range as of Figure (1). The 𝜆 𝐵 𝑟𝑒𝑓 may be chosen as the same value between the used FBG-peak wavelengths range.…”

Section: Principle Of Algorithmmentioning

confidence: 99%

“…The fiber Bragg grating (FBG) based sensors have wide applications in engineering, medical, civil and military etc. due to its small size, low weight, immunity to electromagnetic interference and ease of multiplexing [1][2][3][4]. The basic traditional electrical sensors are nowadays being replaced by FBG sensors due to its ability to sense multiple physical parameters like temperature, strain, humidity, and flow rate etc simultaneously [5][6].…”

Section: Introductionmentioning

confidence: 99%

Efficient detection of multiple FBG wavelength peaks using matched filtering technique

Kumar

Sengupta

2022

Opt Quant Electron

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We propose an efficient technique for FBG peak detection based on matched filtering technique. The matched filtering process is based on resonance point estimation between a standard reference spectral signal and a reflected spectrum of FBG. The desired peak wavelength and corresponding peak intensity are predicted by determining of the cross-correlation between the FBG signal and 3 rd derivative of the reference signal. The peak wavelength and intensity are found from the zero-crossing points of the crosscorrelation function. The Mexican-hat wavelet function is chosen as the reference spectral signal due to its narrow shape. The proposed algorithm can suitably be used for multiple peak detection when several FBGs are cascaded and if the FBG signal is weak and noisy.

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“…The majority of researches have been concentrated on sensing high temperature based on FBG or LPFG or mixture configurations between both [13,14]. However, sensing low temperature is still limited.…”

Section: Literature Reviewmentioning

confidence: 99%

Low Temperature Sensor Based on Etched LPFG with Different Materials Coating

Alshaikhli¹,

Wang²

2022

(MMEP

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A low temperature sensor based on etched Long Period Fiber Grating LPFG is proposed and demonstrated. A chemically etched LPFG sensor coated with (Indium In, Aluminum Al, Silver Ag, Palladium Pd and Titanium Ti) embedded within a build low temperature setup. The sensor investigation was carried out under temperature range of 20℃ to -150℃; and the resonance wavelength shift was collected with different cooling rates of (10, 15, 20, 25℃/min) in order to investigate the effect of cooling rates on the sensor performance. However, the experimental results show that 10 mm LPFG sensor with grating period of 400 µm offer temperature sensitivity of 1.5 times, 2 times, 2.5 times, 3 times and 3.5 times higher than bare LPFG for Ti-coated LPFG, Pd-coated LPFG, Ag-coated LPFG, Al-coated LPFG and In-coated LPFG respectively. The maximum measuring error is less than ±0.5℃, which confirms the effectively using of LPFG sensor in cryogenic application. Moreover, the overall resonance wavelength shifts are 1.213 nm, 1.532 nm, 1.935 nm, 2.015 nm, 2.397 nm and 2.671 for bare LPFG, Ti-coated LPFG, Pd-coated LPFG, Ag-coated LPFG, Al-coated LPFG and In-coated LPFG sensors respectively. According to the cooling rates, the results illustrate that as cooling rate increase, the sensor sensitivity decrease due to the sensor response. For more investigations, simulation work is carried out using MATLAB and the sensor shows a good agreement results between experimental and simulation measurements. It is worth to mention that the main findings will essentially contribute to choose suitable materials for coating LPFG for low temperature sensing purposes and will increase the existing knowledge about optical fiber sensor applications.

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Research on temperature and humidity sensing characteristics of cascaded LPFG-FBG

Cited by 27 publications

References 13 publications

Simultaneous Real-Time Measurements of Temperature, Liquid Level, Humidity, and pH by ZnSe/Co Nanostructure-Coated Polymer Films

Simultaneous Real-Time Measurements of Temperature, Liquid Level, Humidity, and pH by ZnSe/Co Nanostructure-Coated Polymer Films

Efficient detection of multiple FBG wavelength peaks using matched filtering technique

Low Temperature Sensor Based on Etched LPFG with Different Materials Coating

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