Papers by Keyword: Temperature Characteristic

Abstract: In this paper, temperature characteristic of a previous developed nickel-chromium (Ni-Cr) thin film atmosphere pressure sensor is analyzed caused by residual gas. As expected, the output signal of the previous fabricated sensor increases with atmosphere pressures. But when pressure load is fixed, the voltage-temperature characteristic is nonlinear. One factor of this effect is residual gas. Based on the pressure-displacement equation of membrane, the gas balance equation and Provided that the deformation of membrane is spherical crown, the relationship equation of relative change of piezoresistor is defined. Studying the First order derivative and second order derivative of relationship equation of relative change of piezoresistor, it is proved that the residual gas will affect the temperature characteristic of previous designed sensor.

Abstract: In order to decrease the temperature error of MEMS gyroscopes, a mitigation method based on gyroscope array was proposed. Angular rate of MEMS gyroscope fluctuates dramatically with the change of gyro temperature when gyroscope starts up. The temperature characteristic error of MEMS gyroscope has become one of the major errors in the practical application. A mitigation method for temperature error was presented based on MEMS gyroscope array utilizing high correlation of temperature errors in the same batch of MEMS gyroscopes. This method was designed to improve environmental adaptability and shorten the startup time of MEMS based inertial measurement unit. Experimental results showed that the method was feasible and effective.

Abstract: The interior thermal power consumption of fiber-optic gyro is calculated, According to the interior heat source distributing of fiber-optic gyro, the heat design project of fiber-optic gyro is given and designed two kinds different fiber coil framework. The two kind different fiber coils are simulated on heat exchange by ANSYS software. Contrast on the temperature characteristic of two kind different fiber coil gyro has been done by experiment. The simulation and experiment results show that the temperature characteristic is improved to this fiber-optic gyro with interlayer fiber coil framework, the bias stability of the fiber-optic gyro is improved with temperature variety, and the interlayer fiber coil design project is effective and validated.

Abstract: For the purpose of studying the state of health of AOWEI 1.5V/80000F hybrid supercapacitor with aqueous electrolyte for the driving power system of supercapacitor city bus, an equivalent circuit model describing the electrical characteristic of hybrid supercapacitor is proposed according to its working principle. Then, the statistical method of correlation and regression analysis is presented to model the relationship of temperature and equivalent circuit model parameters based on experimental data. The goodness of fit and the test of statistical significance are fulfilled to verify the regression model and coefficients, and results show that the parameters of equivalent circuit model can describe temperature behavior of hybrid supercapacitor.

Abstract: When the temperature is changed, due to the influence of the thermal expansion effect and thermo-optic effect, the thickness and refractive index of each layer of medium of photonic crystal will be Varied. As shown by optical resonators theory, the drift amount of the wavelength has a linear relationship with the variation of temperature. The electron beam lithography technology (EBL) and induction coupling plasma(ICP) etching were used for making the PCs with 1550nm central wavelength. An experiment mode is constructed for analyzing temperature characteristic of one-dimensional PCs, and then PCs is experimented at low temperature and high temperature. It can be found by experiment that, as the temperature changes, the central wavelength of photonic crystal has a linear relationship with the temperature, the drift amount of central wavelength at the low temperature is 0.072nm/°C,the drift amount at the high temperature is 0.076nm/°C,and the 3dB bandwidth of transmission spectrum of photonic crystal has no significant change, the spectral shape is changed very little.

Abstract: There are several ongoing researchers on searching for an appropriate model to describe the characteristic of Vanadium redox flow batteries(VRB) .Based on one of these models, a SOC estimator of VRB- Extended Kalman Filter (EKF) is advanced. And then, update the VRB model by using EKF to estimate SOC when simulation in SIMULINK. At last, the effects of the temperature and operating current on performance of VRB, including battery capacity, output voltage, efficiencies are discussed.

Abstract: This paper investigated a method that proteins were immobilized on platinum surface based on silicon substrate according to the concept self-assembled monolayers. At first, we produced actived carboxyl groups through surface modification of platinum surface on silicon substrate in reaction solution, and then utilized condensation reaction between proteins and carboxyl groups to immobilize proteins (cattle IgG). Secondly, we showed SEM photographs of surface morphologies of immobilization cattle IgG on silicon wafer. EDS energy spectrum microanalysis of cattle IgG immobilization on silicon wafer was also obtained by means of SEM. By contrast,it was evident that proteins (cattle IgG) can be immobilized effectively on the platinum surface on silicon using the experimental methods. Finally, there were tests of I-V characteristic and I-T characteristic of immobilized cattle IgG which demonstrated its temperature coefficient is .

Abstract: The force sensitive characteristic of integrated quartz crystal resonator assembled on one quartz crystal substrate with a certain radial direction force are studied, and it is also studied that the force sensitive characteristic of output frequency which is the mixing frequency by resonant frequency corresponded to the resonators in the different position of the same quartz crystal wafer outputted in difference frequency way. The research result shows the force sensitive characteristic of AT-cut integrated three-electrode quartz crystal resonator outputted in difference frequency way is 1.3 times of that of the traditional single-electrode resonator. The force sensitive characteristic of the integrated four-electrode resonator is a little bit smaller, but two sets of output can be obtained at the same time. The frequency stability of all integrated quartz resonator can get to the magnitude of 10-10 and relative frequency variation is about ±5ppm in the range of -50°C to 60°C.

Abstract: The purpose of this paper is to model and study linear differential Hall sensor. A component for linear differential Hall sensor model was constructed, then a number of experiments were performed to check its output characteristics and temperature characteristics.Two Hall-components formed a linear differential Hall model,which had two independent outputs outputing differential voltage. The results show that the model significantly reduces quiescent output voltage, the signal amplitude increased 99.5%, sensitivity ≥ 40mV/mT, linearity error ≤ 0.5%, zero drift coefficient ≤0.023mV/°C.It is concluded that outputing differential voltage can prohibit common-mode interference and zero shift.The model will has self temperature compensation and nonlinear correctiion.In the future ,this model will practicaly in the current sensor.

Abstract: This research aims to study the temperature characteristic of porous cement concrete as an alternative pavement that can help to mitigate urban heat island effect, and all the benefits it can provide, along with several offspring. Three experiments conducted in this research focus on the effect of specimen thickness,moisture content and wind speed on the thermal conduction properties of porous cement concrete. Isostatic pressing method is adopted in the molding process of specimens and reserved holes method is utilized to measure the internal temperature of the specimens.The data presented in this paper explains the tend of thermal conduction properties accompanying the increase of specimen thickness,moisture content and wind speed.