scholarly journals Ultrasensitive and Multifunction Plasmonic Temperature Sensor with Ethanol-Sealed Asymmetric Ellipse Resonators

Molecules ◽  
2018 ◽  
Vol 23 (10) ◽  
pp. 2700 ◽  
Author(s):  
Jun Zhu ◽  
Jian Lou
Keyword(s):  
Transmission Spectrum ◽  
Temperature Sensor ◽  
Low Cost ◽  
Stop Band ◽  
High Sensitivity ◽  
Blue Shift ◽  
Major Axis ◽  
Pass Band ◽  
Semi Major Axis ◽  
Rectangular Tubes

In order to improve the low temperature sensitivity of conventional sensors, a plasmonic multifunction temperature sensor with high sensitivity is proposed and investigated systematically in this paper. The sensor consists of two metal layers and two ethanol-sealed elliptical resonators connected to a straight waveguide by two rectangular tubes. We numerically analyzed the transmission characteristics of the Nano-device to assess its performance with the finite element method and achieved great optical properties. The results show that an obvious blue shift of the transmission spectrum appears by varying temperatures, exhibiting a great sensing effect. Sensitivity of the sensor reaches −3.64 nm/°C, far greater than conventional temperature sensors. Our research also demonstrates that the transmission spectrum could be modulated efficiently by the ratio of semi-short axis to semi-major axis of the ellipse resonators and the width of two same rectangular tubes. Furthermore, the Nano-device has a filtering characteristic. The transmittances of pass-band and stop-band are 96.1% and 0.1%, respectively. The results of this study can pave the way for low-cost sensing application in high-density photonic circuits and biosensors.

scholarly journals INVESTIGATING THE EFFECT OF TAPER LENGTH ON SENSITIVITY OF THE TAPERED-FIBER BASED TEMPERATURE SENSOR

2016 ◽  
Vol 78 (3) ◽  
Author(s):  
Baktiar Musa ◽  
Yasmin Mustapha Kamil ◽  
Muhammad Hafiz Abu Bakar ◽  
Ahmad Shukri Mohd Noor ◽  
Alyani Ismail ◽  
...  
Keyword(s):  
Temperature Sensor ◽  
Optimum Parameter ◽  
Low Cost ◽  
High Sensitivity ◽  
Single Mode ◽  
Careful Selection ◽  
Tapered Fiber ◽  
Tapered Optical Fiber ◽  
Good Repeatability ◽  
Selection Of

A temperature sensor using single-mode tapered fiber is presented. To better understand the behaviour of a tapered optical fiber, transmission experiments with different taper profiles, specifically waist length were performed. The effects of taper profiles on the sensitivity of the sensor were also investigated. It is demonstrated that careful selection of the taper profile can increase the sensitivity of the sensor. In our experiment, a good temperature sensing result was achieved using the optimum parameter. The best sensitivity achieved was 45.5 pm/°C that measured the range of temperature from 30°C to 120°C. The fabricated sensors are easy to fabricate and relatively low cost. Our results indicate that the tapered fiber based temperature sensor has high sensitivity and good repeatability.  

Study on the Transmission Spectrum of Fiber Bragg Grating as Temperature Sensor

2013 ◽  
Vol 819 ◽  
pp. 197-201
Author(s):  
Zheng Wang ◽  
Ping Yu Zhu ◽  
Hong Qiang Liang ◽  
Wei Peng
Keyword(s):  
Fiber Bragg Grating ◽  
Transmission Spectrum ◽  
Temperature Sensor ◽  
Blue Shift ◽  
Temperature Sensing ◽  
Bragg Grating ◽  
Optical Spectrum Analyzer ◽  
Center Wavelength ◽  
Accurate Analysis ◽  
Spectrum Width

The temperature sensing characteristic of Fiber Bragg Grating (FBG) has been studied. The temperature sensing equation of FBG is revised. The accurate analysis results are obtained. The center wavelength drifts of the tested FBG are displayed in the screen of Optical Spectrum Analyzer (OSA).The experimental results show that the center wavelength of FBG is thermally red-shift with the rise of the temperature and blue-shift with the decrease of the temperature. The results are agree with the revised temperature sensing equation. It is noticed that the transmission spectrum width (SPEC-WD) of FBG fluctuates with the change of temperature. Nevertheless, the trend of the fluctuation is demonstrably towards increase, which perhaps is some potential auxiliary sensing function in future.

High-sensitivity low-cost temperature sensor based on symmetrical metal-cladding optical waveguide

2015 ◽  
Author(s):  
Jinbing Hu ◽  
Jiabi Chen ◽  
Xuexue Luo ◽  
Binming Liang ◽  
Songlin Zhuang
Keyword(s):  
Optical Waveguide ◽  
Temperature Sensor ◽  
Low Cost ◽  
High Sensitivity ◽  
Metal Cladding

scholarly journals Design and Fabrication of Temperature Sensor for Weather Monitoring System using MEMS Technology

2018 ◽  
Vol 34 (5) ◽  
pp. 2510-2516
Author(s):  
Veeramani P. ◽  
Vimala Juliet A. ◽  
Sam Jebakumar J. ◽  
Jagadish R
Keyword(s):  
Monitoring System ◽  
Temperature Sensor ◽  
Low Cost ◽  
High Sensitivity ◽  
Micro Electro Mechanical System ◽  
Temperature Sensors ◽  
High Melting ◽  
Temperature Coefficient Of Resistance ◽  
Mems Technology ◽  
High Degree

In this paper, Micro Electro Mechanical System (MEMS) based temperature sensor is designed and fabricated for weather monitoring system at troposphere level. In this design we have used meander shape, because it is easy to vary the length. We have optimized the length in this design. Due to certain advantages like low cost, easily available, high melting and boiling point, molybdenum material is used for fabrication of this design. The four meander type temperature sensors are designed with various dimensions of sizes in 6.7mm×4mm, 9.5mm×4mm, 5.2mm×4mm, 6.5mm×4mm. The Temperature Coefficient of Resistance (TCR) values for four various sensors mentioned above are 3.4 ×10-4 C-1, 3.7×10-4 C-1, 7.0×10-4 C-1, 7.5×10-4 C-1. For radiosonde applications the sensor must have high sensitivity, high degree of accuracy, good linearity and with better TCR values. The experimental results are better for dimension 6.7mm ×4mm for all characteristics mentioned above. The practical results are compared with the theoretical values.

The Motion of a Neutrally Buoyant Ellipsoid Inside Square Tube Flows

2017 ◽  
Vol 9 (2) ◽  
pp. 233-249 ◽  
Author(s):  
Xin Yang ◽  
Haibo Huang ◽  
Xiyun Lu
Keyword(s):  
Major Axis ◽  
Prolate Spheroid ◽  
Small Displacement ◽  
Semi Major Axis ◽  
Stable Mode ◽  
Axis Length ◽  
Diagonal Plane ◽  
Rolling Mode ◽  
Boltzmann Method ◽  
Rectangular Tubes

AbstractThe motion and rotation of an ellipsoidal particle inside square tubes and rectangular tubes with the confinement ratio R/a∈(1.0,4.0) are studied by the lattice Boltzmann method (LBM), where R and a are the radius of the tube and the semi-major axis length of the ellipsoid, respectively. The Reynolds numbers (Re) up to 50 are considered. For the prolate ellipsoid inside square and rectangular tubes, three typical stable motion modes which depend on R/a are identified, namely, the kayaking mode, the tumbling mode, and the log-rolling mode are identified for the prolate spheroid. The diagonal plane strongly attracts the particle in square tubes with 1.2≤R/a<3.0. To explore the mechanism, some constrained cases are simulated. It is found that the tumbling mode in the diagonal plane is stable because the fluid force acting on the particle tends to diminish the small displacement and will bring it back to the plane. Inside rectangular tubes the particle will migrate to a middle plane between short walls instead of the diagonal plane. Through the comparisons between the initial unstable equilibrium motion state and terminal stable mode, it is seems that the particle tend to adopt the mode with smaller kinetic energy.

scholarly journals Liquid-Crystal-Filled Side-hole Fiber for High-Sensitivity Temperature and Electric Field Measurement

Micromachines ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 761 ◽  
Author(s):  
Yijian Huang ◽  
Ying Wang ◽  
Chun Mao ◽  
Jingru Wang ◽  
Han Wu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Transmission Spectrum ◽  
Low Cost ◽  
High Sensitivity ◽  
Weak Electric Field ◽  
Field Variation ◽  
External Temperature ◽  
Side Hole ◽  
Actual Application

We propose a highly sensitive sensor based on a nematic liquid-crystal-filled side-hole fiber. The liquid crystal is precisely filled into an air hole of the optical fiber using a method of manually gluing in the fusion splicer. Due to the coupling between the liquid crystal waveguide and the fiber core, multiple response dips appear in the transmission spectrum of the device. When an external temperature or electric field variation is applied to the liquid crystal and its refractive index changes, the transmission spectrum of this device will shift accordingly. Temperature and electric field response tests were performed on the device in the experiment, and the obtained temperature and electric field sensitivities were as high as −1.5 nm/°C and 3.88 nm/Vpp, respectively. For the exhibited advantages of being easy to manufacture, low cost, and high sensitivity, the proposed sensor is very promising for actual application in temperature or weak electric field monitoring.

scholarly journals Simultaneous Strain and Temperature Sensor Based on a Fiber Mach-Zehnder Interferometer Coated with Pt by Iron Sputtering Technology

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1535 ◽  
Author(s):  
Xinran Dong ◽  
Haifeng Du ◽  
Xiaoyan Sun ◽  
Ji’an Duan
Keyword(s):  
Simultaneous Measurement ◽  
Temperature Sensor ◽  
Low Cost ◽  
High Sensitivity ◽  
Single Mode ◽  
Zehnder Interferometer ◽  
Strain Sensitivity ◽  
Interference Fringes ◽  
Compact Size ◽  
Mach Zehnder Interferometer

We demonstrated a fiber in-line Mach-Zehnder interferometer (MZI) coated with platinum (Pt) for the simultaneous measurement of strain and temperature. The sensor was fabricated by splicing a section of multimode fiber (MMF) between two single mode fibers (SMFs) and the Pt coating was prepared by iron sputtering technology. Fine interference fringes of over 20 dB with a compact size of 20 mm were achieved. The experimental results of the two different resonant dips showed strain sensitivities of −2.06 pm/με and −2.21 pm/με, as well as temperature sensitivities of 55.2 pm/°C and 53.4 pm/°C, respectively. Furthermore, it was found that the Pt coating can improve the strain sensitivity significantly, resulting in an increase of about 54.5%. In addition, the sensor has advantages of easy fabrication, low cost, and high sensitivity, showing great potential for the dual-parameter sensing of strain and temperature.

Detection and Characterization of earth-like Planets

1997 ◽  
Vol 161 ◽  
pp. 299-311 ◽  
Author(s):  
Jean Marie Mariotti ◽  
Alain Léger ◽  
Bertrand Mennesson ◽  
Marc Ollivier
Keyword(s):  
Direct Detection ◽  
Contrast Ratio ◽  
Angular Size ◽  
Physical Nature ◽  
Major Axis ◽  
Infrared Emission ◽  
Space Technology ◽  
Semi Major Axis ◽  
Earth Like Planets ◽  
Visible Wavelengths

AbstractIndirect methods of detection of exo-planets (by radial velocity, astrometry, occultations,...) have revealed recently the first cases of exo-planets, and will in the near future expand our knowledge of these systems. They will provide statistical informations on the dynamical parameters: semi-major axis, eccentricities, inclinations,... But the physical nature of these planets will remain mostly unknown. Only for the larger ones (exo-Jupiters), an estimate of the mass will be accessible. To characterize in more details Earth-like exo-planets, direct detection (i.e., direct observation of photons from the planet) is required. This is a much more challenging observational program. The exo-planets are extremely faint with respect to their star: the contrast ratio is about 10−10at visible wavelengths. Also the angular size of the apparent orbit is small, typically 0.1 second of arc. While the first point calls for observations in the infrared (where the contrast goes up to 10−7) and with a coronograph, the latter implies using an interferometer. Several space projects combining these techniques have been recently proposed. They aim at surveying a few hundreds of nearby single solar-like stars in search for Earth-like planets, and at performing a low resolution spectroscopic analysis of their infrared emission in order to reveal the presence in the atmosphere of the planet of CO H2O and O3. The latter is a good tracer of the presence of oxygen which could be, like on our Earth, released by biological activity. Although extremely ambitious, these projects could be realized using space technology either already available or in development for others missions. They could be built and launched during the first decades on the next century.

Fabrication of 3D Temperature Sensor Using Magnetostrictive Inkjet Printhead

2020 ◽  
Vol 64 (5) ◽  
pp. 50405-1-50405-5
Author(s):  
Young-Woo Park ◽  
Myounggyu Noh
Keyword(s):  
Flexible Electronics ◽  
Inkjet Printing ◽  
Temperature Sensor ◽  
Computer Aided Design ◽  
Low Cost ◽  
Three Dimensional ◽  
Drop On Demand ◽  
Aided Design ◽  
Nanoparticle Ink ◽  
Inkjet Printhead

Abstract Recently, the three-dimensional (3D) printing technique has attracted much attention for creating objects of arbitrary shape and manufacturing. For the first time, in this work, we present the fabrication of an inkjet printed low-cost 3D temperature sensor on a 3D-shaped thermoplastic substrate suitable for packaging, flexible electronics, and other printed applications. The design, fabrication, and testing of a 3D printed temperature sensor are presented. The sensor pattern is designed using a computer-aided design program and fabricated by drop-on-demand inkjet printing using a magnetostrictive inkjet printhead at room temperature. The sensor pattern is printed using commercially available conductive silver nanoparticle ink. A moving speed of 90 mm/min is chosen to print the sensor pattern. The inkjet printed temperature sensor is demonstrated, and it is characterized by good electrical properties, exhibiting good sensitivity and linearity. The results indicate that 3D inkjet printing technology may have great potential for applications in sensor fabrication.

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