Simultaneous measurement of liquid level and temperature based on spherical-shape structures and long period fiber grating

Xiong, Mengling; Gong, Huaping; Qian, Ziheng; Chen, Zhao; Dong, Xinyong

doi:10.1016/j.sna.2016.01.008

Cited by 39 publications

(8 citation statements)

References 22 publications

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“…When the ambient temperature was raised from 25 ºC to 75 ºC with a temperature interval of 5 ºC, the wavelength dip blueshifts and the sensitivities are -0.204 nm/ºC, -0.327 nm/ºC and -0.346 nm/ºC around 1350 nm, 1550 nm, and 1600 nm, respectively. The reflection spectral responses of the liquid level and temperature in liquid are different, indicating the proposed sensor can be used for measurement of liquid and temperature [23]. The RI of liquid is inversely proportional to temperature [24].…”

Section: Experiments and Resultsmentioning

confidence: 99%

Multi-Parameter Sensors Based on Optical Reflective Coupler Probe

et al. 2022

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1Abstract-We propose and demonstrate multi-parameter sensors based on optical reflective coupler probe (ORCP), for detection of liquid level, temperature, and refractive index (RI). Single-mode fiber ORCP (S-ORCP), few-mode fiber ORCP (F-ORCP) and multi-mode fiber ORCP (M-ORCP) are fabricated by adiabatically tapering and weak fusion technology. The highest liquid level sensitivity is 363.64 nm/mm, achieved by the M-ORCP, with detection limit of as low as 0.06 µm. In addition, multi-parameter measurement of liquid level, temperature and RI can be achieved by the M-ORCP, with temperature and RI sensitivities of -0.327 nm/ºC and 7859.27 nm/RIU, respectively. With the merits of high sensitivity, stability, and compact half-coupler probe structure, the proposed ORCP sensors of ~ cm length can measure the liquid level range of ~3 mm, which have broad application prospects in the fields of fuel storage and chemical liquid level measurement, especially for chemical reagents, biological tissue liquids and flammable and explosive liquids.

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Section: Experiments and Resultsmentioning

confidence: 99%

Multi-Parameter Sensors Based on Optical Reflective Coupler Probe

et al. 2022

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“…In addition, the effective optical path of the light below the liquid level increases in the cladding mode, while the effective optical path of the cladding in the air remains unchanged. The optical path difference will also affect the resonance wavelength . The n eff cl and optical path difference together cause the shift of the resonance wavelength with the rise and fall of the liquid level. L full is the total length of LPFG, L liquid is the length of LPFG in the liquid, and n eff cl’ is the effective refractive index of LPFG cladding in the liquid.…”

Section: Resultsmentioning

confidence: 99%

“…The optical path difference will also affect the resonance wavelength. 34 The n eff cl and optical path difference together cause the shift of the resonance wavelength with the rise and fall of the liquid level.…”

Section: Liquid Level Measurement Of Lpfgmentioning

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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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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“…Among them, the principle of the most widely reported sensors is based on Mach-Zehnder interference (MZI). Xiong et al [10] designed a liquid level sensor formed by spherical shape structures and an LPFG with a sensitivity of −0.214 nm mm −1 . The measurement of liquid level can be achieved by fusing two uptapers [11], and the sensitivity is −22.5 pm mm −1 .…”

Section: Introductionmentioning

confidence: 99%

High sensitivity optical fiber liquid level sensor based on a compact MMF-HCF-FBG structure

Zhang

Chen

et al. 2018

Meas. Sci. Technol.

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An ultra-high sensitivity fiber liquid level sensor based on wavelength demodulation is proposed and demonstrated. The sensor is composed of a segment of multimode fiber and a large aperture hollow-core fiber assisted by a fiber Bragg grating (FBG). Interference occurs due to core mismatching and different modes with different effective refractive indices. The experimental results show that the liquid level sensitivity of the sensor is 1.145 nm mm−1, and the linearity is up to 0.996. The dynamic temperature compensation of the sensor can be achieved by cascading an FBG. Considering the high sensitivity and compact structure of the sensor, it can be used for real-time intelligent monitoring of tiny changes in liquid level.

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Simultaneous measurement of liquid level and temperature based on spherical-shape structures and long period fiber grating

Cited by 39 publications

References 22 publications

Multi-Parameter Sensors Based on Optical Reflective Coupler Probe

Multi-Parameter Sensors Based on Optical Reflective Coupler Probe

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

High sensitivity optical fiber liquid level sensor based on a compact MMF-HCF-FBG structure

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