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[IEEE 2018 IEEE International Conference on Imaging Systems and Techniques (IST) - Krakow (2018.10.16-2018.10.18)] 2018 IEEE International Conference on Imaging Systems and Techniques (IST) - A Fast Way to Get Sensitivity Map of Wire-Mesh
摘要： This paper presents a new method for obtaining the sensitivity map of a wire-mesh sensor (WMS) based on the Maxwell-Wagner effect. The sensitivity map is crucial for the accuracy of electrical capacitance tomography (ECT) in industrial process monitoring. Traditional methods for sensitivity map calculation are complex and time-consuming. The proposed method simplifies this by using a simulation approach that models the WMS as a two-phase flow sensor. The results show that the new sensitivity map improves the imaging quality and reduces the computational time compared to conventional methods. This method is validated through simulations and experiments, demonstrating its effectiveness for practical applications in multiphase flow measurement.
关键词： wire-mesh tomography,sensitivity map,simulation
更新于2025-09-23 15:22:29
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Humidity sensing characteristics of Sb2O3 thin films with transitional electrical behavior
摘要： The quest for smaller and more efficient humidity sensors is still on. Antimony trioxide thin films deposited by vacuum thermal evaporation onto heated glass substrates are analyzed as water vapor sensors, along with the study of their morpho-structural and electrical properties. Several substrate temperatures were set during the depositions, leading to films with significantly different electrical and humidity sensing features. Unusual increase of the electrical resistance of the films with temperature above 170 ?C was noticed, representing the intermediate stage between extrinsic and intrinsic conductivity. In the extrinsic conduction region, the activation energy decreases exponentially with the substrate temperature during the initial depositions. The alternative current (AC), i.e. the electrical frequency characteristics versus humidity were also studied, allowing for the identification of the conduction mechanism within the samples, which is most probably short range hopping of charge carriers through trap sites, influences by the changing grain size and remanent amorphous phase within the films.
关键词： Activation energy,Humidity sensitivity,Antimony trioxide,Thin films,Frequency characteristics
更新于2025-09-23 15:21:21
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Optical temperature sensor with micro ring resonator and graphene to reach high sensitivity
摘要： In this paper, micro temperature sensor with micro ring resonator and graphene material has been investigated. The main idea is to control the temperature of system by the layer of graphene on micro ring resonator path. By rising the temperature of the system, graphene with 5000 W/mK thermal conductivity senses this increase and applies it in sensor resonance peaks. The linear temperature difference causes a linear difference in sensitivity, power, and energy level, which shows the correct functioning of the system. Electronic sensors suffer from electrical disturbances and electromagnetic interference and sometimes do not function properly, therefore this micrometer optical sensor with 44×40 μm dimensions is necessary in industrial and medical fields because it has small dimension, high finesse and sensitivity, low weight and cost in comparison with other sensors. Other materials of this sensor are Si and SiO2 which are natural elements and have a high melting point. The FSR and FWHM of system are 660 GHZ and 30 GHZ which are acceptable values in comparison with other optical sensors. The time rotation and time delay unit reaching to 0.31 ps and 1.51 ps in accordance which have an acceptable time and also total length of ring is 94 μm.
关键词： optical sensor,temperature sensor,sensitivity,micro sensor,graphene,micro ring resonator
更新于2025-09-23 15:21:21
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Performance study of surface plasmon resonance and lossy mode resonance based fiber optic sensors utilizing silver and indium oxide layers: An experimental investigation
摘要： This study presents here the experimental investigations on a surface plasmon resonance (SPR)/lossy mode resonance (LMR) based fiber optic sensors coated with silver and indium oxide layers. Different sensing probes have been fabricated by coating (i) a single layer of indium oxide, (ii) a single layer of silver and (iii) a double layer of indium oxide and silver (with different thicknesses) symmetrically onto to the bare core of silica fiber. The sensitivity of these fiber optic sensing probes towards surrounding region refractive index variations are determined using different concentrations of sucrose solutions. It was found that sensor probe fabricated with coating of 100 nm thickness of indium oxide was two times more sensitive than the conventionally used fiber optic sensing probe coated with only silver layer. The sensitivity of a double layer coated fiber optic sensor with various thicknesses of indium oxide and silver layers is in between the two extremes of the sensitivities. This study will find suitable applications in the field of chemical and biochemical sensing. The drawbacks of silver coatings and the advantages of LMR supporting indium oxide have also been discussed.
关键词： Surface plasmons,Sensitivity,Lossy mode resonances,Thin films,Fiber optic sensors,Detection accuracy,Indium oxide
更新于2025-09-23 15:21:21
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Live E. coli bacteria label-free sensing using a microcavity in-line Mach-Zehnder interferometer
摘要： The paper presents the first study to date on selective label-free biosensing with a microcavity in-line Mach-Zehnder interferometer induced in an optical fiber. The sensing structures were fabricated in a single-mode fiber by femtosecond laser micromachining. In contrast to other studies of this sensing scheme, where only the sensitivity to refractive index changes in the cavity was investigated, this research used chemical surface treatment of the sensor to ensure detection specificity. Immobilized MS2 bacteriophages were applied as recognition elements specifically targeting live E. coli C3000 bacteria. It is shown that the sensor allows for real-time monitoring of biological phenomena taking place on the surface of the microcavity. The developed biosensor exhibits ultrahigh refractive index sensitivity of 15,000 nm/RIU and is capable of detecting live E. coli bacteria concentrations as low as 100 colony forming units (CFU)/mL in liquid volume as low as picoliters.
关键词： label-free biosensing,E. coli C3000 bacteria,refractive index sensitivity,MS2 bacteriophages,femtosecond laser micromachining,microcavity in-line Mach-Zehnder interferometer,optical fiber
更新于2025-09-23 15:21:21
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Design guidelines for high sensitivity ZnO nanowire gas sensors with Schottky contact
摘要： Zinc oxide nanowire (ZnO NW) gas sensor with single Schottky contact is capable of sensitive detection of gas molecules. In this study, we investigate the effect of design factors such as nanowire defect density, diameter, and length on the gas sensitivity using 3-D numerical simulation. The sensor with lower defect density or smaller NW diameter exhibits improved gas sensitivity, while length does not have an impact when not considering the external environment such as background gases and binding probability. Lower defect density causes low electron density within the NW in air environment, and the change in electron density due to gas adsorption is intensified, thus improving gas sensitivity. As the NW diameter decreases, the change in the electrical conductivity due to gas molecules is greatly increased due to an increase in the ratio of the depletion area to the entire NW area. In contrast, the nanowire length does not impact the gas sensitivity because the change in the electron density is independent of the length. These results are helpful to understand the sensing mechanism and provide design guidelines to maximize the sensitivity.
关键词： Zinc oxide,Gas sensitivity,Nanowire,Numerical simulation,Gas sensor
更新于2025-09-23 15:21:21
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Optimized Bent Part Coupling SiON Racetrack Resonators for Biological Sensing
摘要： In this work, we investigate the optimized parameters of bent part coupling silicon oxynitride (SiON) micro racetrack optical resonators coupled to a straight waveguide, for an efficient design of label free biosensor devices. A systematic engineering of waveguide-resonator characteristics, for optimum geometry and field-overlap with analytes is proposed. Different parameters of system such as coupling, intrinsic and total quality factors of Qκ , Qi, and Qt, sensitivity (S) and figure of merit (F OM ) or intrinsic limit of detection (ILOD), are examined with interest of taking into account the dispersion effect in calculations. To the best of our knowledge, considering dispersion effect in calculations, has been proposed for the first time in bent part coupling racetrack resonator based biosensors. We have shown the effective role of dispersion on the best optimized parameters of the biosensors. These investigations result in high amounts of S (435 nm/RIU) and Qt (≥45000), simultaneously for the proposed biosensors. The devices have been optimized for operation at wavelength of 850 nm. The biosensing performance of our biosensor, is compared with lately reported theoretical and experimental investigations. Based on the ILOD calculations, performance of our sensor structure, is improved by a factor of 0.10 compared to a resonator based biosensor, reported lately.
关键词： sensitivity,biosensor device,Dispersion,bent part coupling racetrack resonator,ILOD
更新于2025-09-23 15:21:21
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Avoided Crossing and sub-Fourier-sensitivity in Driven Quantum Systems
摘要： The response of a linear system to an external perturbation is governed by the Fourier limit, with the inverse of the interaction time constituting a lower limit for the system bandwidth. This does not hold for nonlinear systems, which can thus exhibit sub-Fourier-behavior. The present Letter identifies a mechanism for sub-Fourier-sensitivity in driven quantum systems, which relies on avoided crossing between Floquet states. Features up to three orders of magnitude finer than the Fourier limit are presented.
关键词： driven quantum systems,Floquet states,avoided crossing,sub-Fourier-sensitivity
更新于2025-09-23 15:21:21
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[IEEE 2018 3rd International Conference On Internet of Things: Smart Innovation and Usages (IoT-SIU) - Bhimtal, India (2018.2.23-2018.2.24)] 2018 3rd International Conference On Internet of Things: Smart Innovation and Usages (IoT-SIU) - Organic Thin Film Transistor Based Graphene Drooped Sensors
摘要： Graphene film drooped on a bottom gate bottom contact (BGBC) is adopted for fabricating gas sensing technology. The sensors are competent of identifying toxic gases like CO2, NO2, CO of ultra-low surrounding air by calibrating sensitivity which is the measure of change in maximum drain current in presence of air and in absence of any toxic material on graphene layer whereas, the initial condition of graphene remaining constant except temperature. The main principle of the device is that graphene can act productively to endeavor abounding physio-chemical properties that are beneficial for gas sensing techniques which would keep a check on increasing toxic level at homes, schools, car and would prove to be beneficiary against sick building syndrome (SBS). The sensors provide an advantage of low power, low cost, good sensitivity and stability.
关键词： sensitivity,PEDOT:PSS- Poly(ethylene-dioxythiophene) /polystyrene sulphonate),Sick building syndrome (SBS),Graphene
更新于2025-09-23 15:21:21
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[Nanostructure Science and Technology] Nanowire Electronics || One-Dimensional Nanowire-Based Heterostructures for Gas Sensors
摘要： Gas sensors with the ability to detect gaseous species in a quantitative and qualitative manner play an important role in various aspects in our daily lives. They can function as a feasible means to monitor air quality, environmental pollution, chemical detection, control of chemical processes, food quality, and medical diagnosis and so forth. One-dimensional (1D) nanostructures at least one dimension in the range of 1–100 nm (nanowires, nanorods, nanoribbons or nanobelts, nano?bers) have long been considered as promising building blocks for gas sensors [1–7]. The fascinating features of nanowires for gas sensing include high surface-to-volume ratio, sensitive surface, high crystallinity, high carrier mobility, low power consumption and ease for device integration [2, 6, 8, 9]. In 2001 nanowires were initially employed to fabricate gas sensors as proof-of-concept [2, 3]. Afterwards nanowires are drawing fast growing interest in the ?eld of gas sensing with an outcome of over 1200 publications in past 15 years from the Web of Science using the keywords nanowire and gas sensor (Fig. 7.1). It is important to note that among these publications metal oxide nanowires hold a dominant position, while other nanowires including organic polymers, metals, and other semiconductors only register a small part (12.6%). It is not strange that n-type ZnO and SnO2 nanowires are the most extensively studied materials for gas sensing because the electron mobility in ZnO and SnO2 is very high (160 and 200 cm2 V(cid:1)1 s(cid:1)1, respectively) with respect to that of other metal oxides such as In2O3, WO3 and TiO2 (100, 10 and 0.4 cm2 V(cid:1)1 s(cid:1)1, respectively).
关键词： speed,heterostructures,sensitivity,nanowires,gas sensors,metal oxide,selectivity,stability
更新于2025-09-23 15:21:21