scholarly journals Glycerol–Water Solution-Assisted Mach–Zehnder Temperature Sensor in Specialty Fiber with Two Cores and One Channel

Photonics ◽  
2021 ◽  
Vol 8 (4) ◽  
pp. 103
Author(s):  
Haiming Qiu ◽  
Chunyu Zhao ◽  
Xuehao Hu ◽  
Haijin Chen ◽  
Qianqing Yu ◽  
...  
Keyword(s):  
Temperature Sensor ◽  
Water Solution ◽  
Central Core ◽  
Fluidic Channel ◽  
Glycerol Water ◽  
Guided Mode ◽  
Precision Temperature ◽  
Transmitted Spectrum ◽  
Dual Core ◽  
Higher Sensitivity

In this paper, we propose an in-fiber Mach–Zehnder temperature sensor based on a dual-core fiber with an eccentric core and a central core. The latter one is beside a fluidic channel embedded in the fiber. The effective refractive index of the guided mode in the central core could be influenced by the glycerol–water solution filled in the fluidic channel. Thus, the transmitted spectrum of the sensor is shifted as a function of temperature. By monitoring the selected spectral dip shifts, an experimental sensitivity of 2.77 nm/°C is obtained in the range of 25 to 40 °C for a solution length of 15 cm. To further improve the temperature sensitivity, the solution length is increased up to 29.5 cm, and a higher sensitivity of 5.69 nm/°C is achieved in the same temperature range. The experimental results agree well with the theoretical ones. The proposed sensor has good robustness and stability, which makes it promising for applications of high precision temperature monitoring.

Characteristics of air entrainment during dynamic wetting failure along a planar substrate

2014 ◽  
Vol 747 ◽  
pp. 119-140 ◽  
Author(s):  
E. Vandre ◽  
M. S. Carvalho ◽  
S. Kumar
Keyword(s):  
High Speed ◽  
Water Solution ◽  
Air Entrainment ◽  
Dynamic Contact ◽  
Operating Conditions ◽  
Dynamic Wetting ◽  
Glycerol Water ◽  
Planar Substrate ◽  
Wide Range ◽  
Stationary Plate

AbstractCharacteristic substrate speeds and meniscus shapes associated with the onset of air entrainment are studied during dynamic wetting failure along a planar substrate. Using high-speed video, the behaviour of the dynamic contact line (DCL) is recorded as a tape substrate is drawn through a bath of a glycerol/water solution. Air entrainment is identified by triangular air films that elongate from the DCL above some critical substrate speed. Meniscus confinement within a narrow gap between the substrate and a stationary plate is shown to delay air entrainment to higher speeds for a wide range of liquid viscosities, expanding upon the findings of Vandre, Carvalho & Kumar (J. Fluid Mech., vol. 707, 2012, pp. 496–520). A pressurized liquid reservoir controls the meniscus position within the confinement gap. It is found that liquid pressurization further postpones air entrainment when the meniscus is located near a sharp corner along the stationary plate. Meniscus shapes recorded near the DCL demonstrate that operating conditions influence the size of entrained air films, with smaller films appearing in the more viscous solutions. Regardless of size, air films become unstable to thickness perturbations and ultimately rupture, leading to the entrainment of air bubbles. Recorded critical speeds and air-film sizes compare well to predictions from a hydrodynamic model for dynamic wetting failure, suggesting that strong air stresses near the DCL trigger the onset of air entrainment.

Research and Analysis of a Portable Precision Temperature Sensor

2014 ◽  
Vol 945-949 ◽  
pp. 1924-1931
Author(s):  
Hai Qing Yao ◽  
Heng Cao ◽  
Fei Jiang ◽  
Bo Sun
Keyword(s):  
Temperature Sensor ◽  
Low Cost ◽  
Current Source ◽  
Control Unit ◽  
Constant Current ◽  
Interference Signal ◽  
Constant Current Source ◽  
Differential Signal ◽  
Precision Temperature ◽  
Micro Control Unit

Based on the excellent performance of Pt100, a portable low-cost precision temperature sensor has been designed, whose core chips are REF03, AD8603, AD7788 and precision resistors. Constant current source (CCS) for 4-wire Pt100 is constituted by REF03, AD8603 and precision resistors. AD7788 measures the differential signal on Pt100 and suppresses the common mode interference signal. Analysis software running on the micro control unit (MCU) filters the digital code from AD7788, and then calculates the current temperature value according to the resistance-temperature mathematical model of Pt100. Analysis and experimental results show that the temperature measurement accuracy of the sensor can reach ±1°C within the range of 0°C-650°C.

scholarly journals Synthesis of α-CaSO4·0.5H2O from flue gas desulfurization gypsum regulated by C4H4O4Na2·6H2O and NaCl in glycerol-water solution

RSC Advances ◽  
2017 ◽  
Vol 7 (44) ◽  
pp. 27807-27815 ◽  
Author(s):  
Qing-Jun Guan ◽  
Wei Sun ◽  
Yue-Hua Hu ◽  
Zhi-Gang Yin ◽  
Chang-Ping Guan
Keyword(s):  
Phase Transition ◽  
Flue Gas ◽  
Water Solution ◽  
Flue Gas Desulfurization ◽  
New Method ◽  
Glycerol Water ◽  
Aspect Ratios

A brand new method to prepare α-CaSO4·0.5H2O with low aspect ratios from flue gas desulfurization gypsum in glycerol-water solution was presented, in which NaCl was used as the phase transition accelerator and C4H4O4Na2·6H2O as the crystal modifier.

scholarly journals Design of data collection box based on NRF24L01

2018 ◽  
Vol 173 ◽  
pp. 01006
Author(s):  
Hou Xingna ◽  
Ma Jun ◽  
Chen Shouhong ◽  
Tao Daiyu
Keyword(s):  
Data Collection ◽  
Wireless Communication ◽  
Real Time ◽  
Temperature Sensor ◽  
Agricultural Production ◽  
Design Method ◽  
Experimental Result ◽  
Collection System ◽  
Communication Module ◽  
Precision Temperature

For the increasingly demanding of real-time temperature monitoring in industrial and, agricultural production, a data collection box based on wireless communication module NRF24L01 is, designed, temperature is collected by a high-precision temperature sensor AD590.Design method of hardware and software of the system is described in detail, the configuration method of NRF24L01 is given., The application of this design in wireless temperature collection system is discussed.The experimental result shows that the design has realized two real-time monitoring on temperature of two points, it can display the, value in different environment, a sounder is equipped in the design to alarm for over-temperature.

Effects of Liquid Viscosity on Laser-Induced Shock Dynamics

2019 ◽  
Author(s):  
Hiroki Kurahara ◽  
Keita Ando
Keyword(s):  
Pulse Laser ◽  
High Speed ◽  
Water Solution ◽  
Plasma Pressure ◽  
Rapid Expansion ◽  
Glycerol Concentration ◽  
Glycerol Water ◽  
Initial Plasma ◽  
Front Position ◽  
532 Nm

Abstract We experimentally study the effects of viscosity on laser-induced shockwave in glycerol-water solution. A shockwave is generated through rapid expansion of plasma, which is induced by focusing a 6 ns pulse laser (532 nm) of energy fixed at 1.66 ± 0.22 mJ into 80, 90, 100 wt% glycerol-water solution. The shockwave propagation is recorded by an ultra-high-speed camera taken at 100 Mfps together with a pulse laser stroboscope. The photographs are used to determine the shock front position as a function of time, which allows for calculating the shock pressure according to the stiffened-gas type Rankine-Hugoniot relation. It turns out that the initial plasma pressure is reduced by having higher glycerol concentration (i.e., higher viscosity); therefore, wave steepening effect is deemphasized, resulting in a smaller decay rate.

Tuning the hygro-mechanical response of paper-based systems using glycerol

2020 ◽  
pp. 1045389X2094716
Author(s):  
Isaias Cueva-Perez ◽  
Roque Alfredo Osornio-Rios ◽  
Aurelio Dominguez-Gonzalez ◽  
Ion Stiharu ◽  
Angel Perez-Cruz
Keyword(s):  
Dynamic Response ◽  
Resonance Frequency ◽  
Mechanical Response ◽  
Water Solution ◽  
Low Cost ◽  
Mechanical Systems ◽  
Lumped Parameter Model ◽  
Glycerol Water ◽  
Energy Harvesters ◽  
Lumped Parameter

In recent years, the need for portable, low-cost, and eco-friendly devices for testing and monitoring has arisen. Paper-based devices have emerged as a response to these needs due to the properties induced by capillarity, flexibility, disposability, and biodegradability. In this work, the authors explored the possibility of tuning the hygro-mechanical response of paper-based cantilever beams using glycerol. A lumped-parameter model with non-linear stiffness is used to describe the dynamic response of the beams using three parameters. An experimental method based on resonance frequency tests is used to study the influence of glycerol on the dynamic response of four different beam configurations. The obtained results demonstrate that the resonance frequency of paper-based mechanical systems can be easily tuned by the imbibition of a glycerol–water solution. This study could lead to the development of tunable paper-based mechanical systems for specific applications such as energy harvesters and hygro-mechanical-based sensors.

Synthesis of ZnO microstructures in glycerol/water solution

2014 ◽  
Vol 40 (1) ◽  
pp. 141-148 ◽  
Author(s):  
Xiaobin Dong ◽  
Aiyu Zhang ◽  
Ping Yang
Keyword(s):  
Water Solution ◽  
Glycerol Water
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