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- 摘要
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[IEEE 2019 Photonics North (PN) - Quebec City, QC, Canada (2019.5.21-2019.5.23)] 2019 Photonics North (PN) - Sensitive Temperature Sensors based on High Birefringence Liquid-Filled Photonic Crystal Fibers
摘要： We propose a new design of a highly birefringent photonic crystal fiber (HBPCF) via infiltration of two holes adjacent to the core of the fiber with two different liquids. As the refractive index of liquids is sensitive to temperature variations, the proposed HBPCF can be used in a Sagnac interferometer as a highly sensitive temperature sensor. The proposed HBPCF can show birefringence of 4 × 10-4 and birefringence sensitivity of 25% for a 5oc temperature variation around 25oc which corresponds to a sensitivity of around 10 nm/oc.
关键词： liquid filled photonic crystal fiber,fiber optic sensor,temperature sensor photonic crystal fiber
更新于2025-09-11 14:15:04
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Quasi-D-Shaped Fiber Optic Plasmonic Biosensor for High-Index Analyte Detection
摘要： In this paper, we propose a highly sensitive quasi-D-shaped fiber optic biosensor for detection of high refractive index (RI) liquid analytes via surface plasmon resonance. The main mechanism of sensing is interplay between photonic crystal fiber fundamental mode and plasmonic mode which leads to formation of different resonance peaks depending on the analyte RI. We numerically analyze the structure sensitivity to design parameters and demonstrate the sensing performance of the proposed biosensor using both spectral sensitivity and amplitude sensitivity methods. The proposed biosensor has a RI detection range of 0.15 refractive index unit (RIU) from 1.45 to 1.6. The sensor exhibits linear sensing performance with a RI spectral sensitivity of 9300 nm/RIU for analyte RI ranging from 1.45 to 1.525, 1176 nm/RIU for analyte RI ranging from 1.525 to 1.6 and in particular, 11800 nm/RIU for analyte RI between 1.475 and 1.5. Furthermore, an average RI sensitivity of 4800 nm/RIU for analyte RI ranging from 1.45 to 1.6 is demonstrated. We also study the amplitude sensitivities of the proposed sensor which show promising maximum values of 183.6 RIU-1 for 785 nm excitation and 820 RIU-1 for 1050 nm excitation. Due to the simple structure of the proposed biosensor, large detection range, high sensitivity and promising linear sensing performance, the proposed biosensor can be a promising candidate for detecting various high RI chemical and biochemical samples.
关键词： plasmonic biosensor,photonic crystal fiber,high index analyte detection,Fiber optic sensor,refractive index sensing
更新于2025-09-11 14:15:04
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[IEEE 2018 14th International Conference on Advanced Trends in Radioelecrtronics, Telecommunications and Computer Engineering (TCSET) - Lviv-Slavske (2018.2.20-2018.2.24)] 2018 14th International Conference on Advanced Trends in Radioelecrtronics, Telecommunications and Computer Engineering (TCSET) - Special features of structural design for a fiber-optic microdisplacement transducer
摘要： In this paper, we describe the design of a fiber-optic pressure sensor and the principle of operation. The principle of operation of fiber-optic pressure sensors is as follows. From the radiation source, the light flux along the supply optical fibers is directed to the side of the membrane at an angle, the value of which is selected from the condition of ensuring the maximum sensitivity of the conversion and the depth of modulation of the optical signal. Under the influence of controlled pressure, the membrane deflects, and in the central part the gap between the membrane and the bevelled ends of the optical fibers will be less than the initial value X0. As a result, the reflectivity for electromagnetic waves in the region of the chamfered ends of the optical fibers changes, and accordingly the intensity of the light flux reflected at an angle from the given region, which carries information about the measured pressure and arrives along the diverting optical fibers to the radiation receiver, changes. The optical system of a fiber-optic pressure sensor is calculated, which consists in determining a number of fiber-optic micro-displacement design parameters the MathCAD transducer. Mathematical modeling environment was carried out. Based on the results of mathematical modeling, a new design solution has been proposed for a fiber-optic micro-displacement transducer, in which the incoming and outgoing optical fibers are cut off and located at a calculated angle. The function of converting a fiber-optic micro-displacement transducer is defined. The selected parameters ensure the fulfillment of the conditions for reducing the temperature and dynamic errors, increasing the sensitivity of the optical signal conversion while reducing the mass-dimensional characteristics of the fiber-optic pressure sensor.
关键词： silicon membrane,transformation function,optical fiber,fiber-optic sensor,fiber-optic transducer
更新于2025-09-10 09:29:36
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In-fiber integrated sensor array with embedded weakly reflective joint surface
摘要： An integrated sensor array with the embedded weakly reflective joint surface is proposed and demonstrated. The weak reflector is formed of a single mode fiber (SMF) and a double-cladding fiber (DCF), whose cores have different refractive index. A sensor array based on this structure is sensitive to strain and temperature, and it has the ability to achieve quasi-distributed measurements. Therefore, it can be used for structural health monitoring (SHM). Besides that, without any connector, the sensors were integrated in a fiber. Consequently, they are more suitable for a harsh test environment (space limitation or high temperature).
关键词： strain measurement,white light interferometer,distributed strain sensor,Fiber optic sensor
更新于2025-09-10 09:29:36
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Performance comparison of high temperature sensor based on non-adiabatic silica microfiber and single mode-multimode-single mode fiber structure
摘要： A fiber-based temperature sensor operating at high temperature was demonstrated using multimode interference effect and its performance was compared with that of two different probes based on a non-adiabatic microfiber and singlemode-multimode-singlemode (SMS) fiber structure. Interference fringes of the output red-shifted as the temperature increased due to the change in the effective refractive index of the multiple modes inside both structures. The sensor probes were able to measure the temperature variation up to 400°C with a linearity of more than 90%. The temperature sensitivity of the microfiber and SMS sensors is 6.0 PM/°C and 11.1 PM/°C, respectively. Our proposed sensors are simple, relatively cheap to be fabricated, and could operate at high temperatures above 300°C.
关键词： Interference filter,Fiber-optic sensor,high temperature sensor
更新于2025-09-10 09:29:36
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Feasibility of Distributed Fiber Optic Sensor for Corrosion Monitoring of Steel Bars in Reinforced Concrete
摘要： This study investigates the feasibility of distributed fiber optic sensor for corrosion monitoring of steel bars embedded in concrete. Two sensor installation methods are compared: (1) attaching the sensor along the bar and (2) winding the sensor on the bar. For the second method, optical fibers were winded spirally on steel bars with different spacings: 0 mm, 2 mm, 5 mm, and 10 mm. Steel bar pull-out testing was conducted to evaluate the effect of presence of distributed sensor on the bond strength of steel–concrete interface. Electrochemical testing was carried out to assess the influence of the installation methods on the corrosion resistance of the reinforced concrete. Winding the optical fiber on steel bars with a 10-mm spacing does not affect the bond strength and corrosion resistance and allows real-time corrosion monitoring. The distributed sensor data can be used to estimate the corrosion induced steel loss and predict concrete cracking.
关键词： distributed fiber optic sensor,installation,pull-out test,steel mass loss,corrosion monitoring,expansion strain,electrochemical test
更新于2025-09-10 09:29:36
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Measurement of In-fiber Refractive Index Change Using a Mach-Zehnder Interferometer
摘要： We report, for the first time, the use of a fiber optic Mach-Zehnder interferometer to measure core refractive index changes written by an ultrafast laser irradiation. The core-offset interferometer was constructed by splicing a slightly misaligned stub of standard single mode fiber between lead-in and lead-out optical fibers. When the core refractive index of an in-fiber interferometer is altered, it changes the phase of the core light. Since the phase of light propagating in the cladding (reference arm) remains unchanged, the transmission fringe pattern of the interferometer observes a spectral shift. The spectral shift was used to quantify the effective core refractive index change in a standard single mode fiber. Measurement of effective refractive index changes as high as 0.01356 and as low as 0.000475 are reported in this work.
关键词： effective refractive index change,fiber-optic sensor,ultrafast laser,Mach-Zehnder interferometer,in-fiber refractive index measurement
更新于2025-09-04 15:30:14
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Real-time temperature sensor based on in-fiber Fabry-Perot interferometer embedded in a resin
摘要： A simple to fabricate, cost-effective, robust, and highly accurate fiber optic temperature sensor is proposed and experimentally demonstrated. The sensor head consists of an in-fiber Fabry-Perot interferometer (FFPI) embedded in a mold made of a polyester resin. FFPI, which in general present good strain sensitivity and low temperature sensitivity, was assembled by splicing a microsegment of capillary fiber (CF) of 14.66 μm between two single-mode fibers (SMFs). The reflected spectrum of the FFPI exhibited a single interference dip within a span of 80 nm. The dimensions of the resin mold can be modified by changing the ambient temperature, which in turn changes the length of the FFPI air-cavity. The dip of the reflected spectrum is shifted towards shorter (larger) wavelengths when external temperature is decreased (increased). The large free spectral range (FSR) allowed to monitor the temperature changes by either a wavelength or an intensity interrogation scheme. Using a laser and an optical power meter it was possible to demonstrate a real-time temperature sensor with a sensitivity of -60.79 nW/oC and a resolution of 0.5 oC, in the range of 10-30 oC. We believe that the practicality of this real-time sensor can be very attractive for environmental sensing application.
关键词： Fabry Perot interferometer,Fiber optic sensor,Strain sensor,Polymers
更新于2025-09-04 15:30:14