Strain and temperature discrimination using two sections of PMF in Sagnac interferometer

Xiao, Siyu; Wu, Beilei; Dong, Yue; Han, Xijiang; Yao, Shuzhi; Jian, Shuisheng

doi:10.1016/j.optlastec.2019.01.016

Cited by 39 publications

(8 citation statements)

References 18 publications

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“…Two PMF length sensors are connected to the same Sagnac loop to ensure that there are enough troughs as monitoring points between 1450 and 1650 nm. In addition to the abovementioned differences in trough sensitivity in different bands, the Vernier effect generated by PMF with different sizes further expands the differences in trough sensitivity. , When PMF a is a measurement sensor, PMF b is a reference sensor. The trough interval Δλ cascaded of the cascaded Sagnac can be derived using formula where Δλ ref and Δλ sen are the trough intervals of the reference and sensing sensors, respectively.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…Capillary sensor and hose sensor were prepared as shown in the Figure . Compare the sensitivity of references in Supporting Information (SI) Table S1, − ,,,, high sensitivity sensing is achieved in temperature, stress, and micro bending gradient sensitization. The number of troughs is increased in the same band range, and different troughs have different sensitivities.…”

Section: Introductionmentioning

confidence: 87%

“…Optical fiber sensor plays an important role in industrial production and home life because of its advantages of corrosion resistance, anti-interference, low transmission loss, instantaneous response, and portability. − The adjustment of the sensitivity of measurement parameters such as temperature, stress, and micro bending to adapt to different applications and the elimination of the inherent cross sensitivity of optical fiber sensors has become a hot spot in the research of optical fiber sensors. − The construction of monolayer on fiber sensor is very common in the past. However, the multilayer composite film is not easy to realize due to the preparation method and the mismatch between multilayer film and fiber sensor often makes the effect unsatisfactory.…”

Section: Introductionmentioning

confidence: 99%

Polarization Maintaining Fiber Temperature and Stress Gradient Sensitization Sensor Based on Semiconductor-Metal–Polymer Three-Layer Film Coating

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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Increasing sensitivity, measuring points, and stability have always been the pursuit of sensors. ZnSe9:CO1 and Ag composite nano films were coated on polarization maintaining fiber (PMF). Then, the coated PMF was nested in capillary and hose which was encapsulated with polydimethylsiloxane (PDMS) and epoxy resin. The integrated capillary sensor and thermoplastic hose sensor were prepared. The gradient sensitization of various measurement parameters such as temperature, stress, and micro bending is realized. The temperature sensitivity is 1.49 nm/°C, the micro bending sensitivity is 1.72 nm/102 g, and the stress sensitivity is 6.27 nm/mε. The sensors maintain good linearity and instantaneous response while having high sensitivity. By adjusting the length of PMF, the number of troughs is increased in the same band range, and different troughs have different sensitivities, which solves the inherent problem of cross sensitivity and realizes multiparameter measurement. Capillary sensors are used for remote safe real-time monitoring of mechanical overheating, and hose sensors are used for real-time monitoring of bridge load and human joint bending. This work is of great significance to the extension of the application range of optical fiber sensor.

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“…Optical fiber interferometer sensors have the advantages of small size, compactness, and high sensitivity, which is why they are widely used in petroleum, chemical industries, and physical and biomedicine sensing [1][2][3][4][5]. There are various types of optical fiber interferometers, including the fiber Fabry-Pérot interferometer, the Mach-Zehnder interferometer (MZI), and the Michelson and Sagnac interferometer [6][7][8][9][10][11][12][13][14][15]. Among these sensor structures, the optical fiber MZI sensor has attracted considerable research interest and been applied for various parameter measurements, such as temperature, strain, bending, liquid level, and refractive index (RI), due to its flexibility in structure design [16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

High Temperature (Up to 950 °C) Sensor Based on Micro Taper In-Line Fiber Mach–Zehnder Interferometer

Liao

Liu

et al. 2019

Applied Sciences

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A high temperature (up to 950 °C) sensor was proposed and demonstrated based on a micro taper in-line fiber Mach–Zehnder interferometer (MZI) structure. The fiber MZI structure comprises a single mode fiber (SMF) with two micro tapers along its longitudinal direction. An annealing at 1000 °C was applied to the fiber sensor to stabilize the temperature measurement. The experimental results showed that the sensitivity was 0.114 nm/°C and 0.116 nm/°C for the heating and cooling cycles, respectively, and, after two days, the sensor still had a sensitivity of 0.11 nm/°C, showing a good stability of the sensor. A probe-type fiber MZI was designed by cutting the sandwiched SMF, which has good linear temperature responses of 0.113 nm/°C over a large temperature range from 89 to 950 °C. The probe-type fiber MZI temperature sensor was independent to the surrounding refractive index (RI) and immune to strain. The developed sensor has a wide application prospect in the fields of high temperature hot gas flow, as well as oil and gas field development.

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Strain and temperature discrimination using two sections of PMF in Sagnac interferometer

Cited by 39 publications

References 18 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

Polarization Maintaining Fiber Temperature and Stress Gradient Sensitization Sensor Based on Semiconductor-Metal–Polymer Three-Layer Film Coating

High Temperature (Up to 950 °C) Sensor Based on Micro Taper In-Line Fiber Mach–Zehnder Interferometer

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