Analysis Temperature Characteristics of Atmosphere Pressure Sensor Caused by Residual Gas

2015 ◽  
Vol 645-646 ◽  
pp. 504-508
Author(s):  
Li Dong Du ◽  
Zhan Zhao ◽  
Shao Hua Wu ◽  
Zhen Fang
Keyword(s):  
Pressure Sensor ◽  
Temperature Characteristic ◽  
Order Derivative ◽  
Atmosphere Pressure ◽  
Nickel Chromium ◽  
Residual Gas ◽  
Relative Change ◽  
The Relationship ◽  
Gas Balance ◽  
Relationship Equation

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.

Temperature Characteristic of Platinum Piezoresistive Pressure Sensor

2011 ◽  
Vol 483 ◽  
pp. 180-184 ◽  
Author(s):  
Li Dong Du ◽  
Li Xiao ◽  
Zhan Zhao ◽  
Zhen Fang ◽  
Jing Xu ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Pressure Sensor ◽  
Adhesive Bonding ◽  
Temperature Characteristic ◽  
Bonding Layer ◽  
Resistance Change ◽  
Atmosphere Pressure ◽  
Piezoresistive Pressure Sensor ◽  
Sensing Material ◽  
The Relationship

Temperature characteristic of platinum piezoresistive atmosphere pressure sensor is studied in this paper, in which platinum is used as the sensing material and SU-8 is used as adhesive bonding layer. Normally, temperature variation will bring on resistance change of sensing platinum resistor with a linear relationship. Simultaneously, the thermal expansion mismatching in different material will also change the resistance. They both affect the temperature characteristic of sensor. Based on elasticity theory, the relationship between resistance change and thermal expansion mismatching is analyzed and is not linear. Sum of two parts resistance change is still nonlinear. Because the output of atmosphere pressure sensor is proportional to resistance change, relationship between output and temperature change is also nonlinear. The analysis is consistent with the experimental results.

Simplified Procedure for Estimating the Effect of a Change in Heating Rate on Sterilization Value1

1983 ◽  
Vol 46 (1) ◽  
pp. 16-18 ◽  
Author(s):  
D. NAVEH ◽  
I. J. PFLUG ◽  
I. J. KOPELMAN
Keyword(s):  
Heating Rate ◽  
Thermal Process ◽  
Temperature Response ◽  
Numerical Differentiation ◽  
General Relationship ◽  
Response Parameter ◽  
Simplified Procedure ◽  
Relative Change ◽  
The Relationship ◽  
Formula Method

A general relationship between a relative change in the temperature response parameter, f, and the sterilization value delivered in a thermal process has been developed. The relationship is based on numerical differentiation of Ball's formula method and employs a dimensionless elasticity term to express the relative change in sterilization value due to a relative change in heating rate. The funtion presented can be used for g's of up to 30°F and for changes of 3 to 20% in the value of the temperature response parameter.

DEVELOPMENT OF A HYBRID SOIL PRESSURE SENSOR AND ITS APPLICATION TO SOIL COMPACTION

2020 ◽  
Author(s):  
Mark Talesnick ◽  
Moti Ringel ◽  
Kyle Rollins
Keyword(s):  
Pressure Sensor ◽  
Soil Compaction ◽  
Compaction Pressure ◽  
Confining Pressure ◽  
Soil Pressure ◽  
Compaction Process ◽  
Vibratory Compaction ◽  
Soil Strain ◽  
The Relationship

A new soil pressure sensor based on a combination of the deflecting membrane and fluid filled approaches has been developed. The advantages of this combined approach are that issues of sensor compliance are eliminated without reducing the effectiveness of the sensor to be used for dynamic measurements. Calibration and verification testing performed under controlled laboratory conditions illustrate these benefits. The new system was implemented in a full-scale field trial which involved the construction of a compacted engineered fill 1.8 m in height. As each layer of fill was placed and compacted vertical in-soil pressure and vertical in-soil strain were continuously measured. During the vibratory compaction process both vertical soil pressure and vertical soil strain histories were captured in each layer. The data collected allowed for the determination of fill stiffness for both static and dynamic conditions. The results illustrate the effect of both confining pressure and strain level on fill stiffness. The relationship between compaction pressure and depth is clearly defined.

A Novel Threshold Pressure Sensor Based on Nonlinear Dynamics of MEMS Arches

2017 ◽  
Author(s):  
Mohammad H. Hasan ◽  
Fadi M. Alsaleem ◽  
Hassen M. Ouakad
Keyword(s):  
Pressure Sensor ◽  
Threshold Value ◽  
General Concept ◽  
Digital Logic ◽  
Operating Pressure ◽  
Shallow Arch ◽  
Output Amplitude ◽  
Electrically Actuated ◽  
The Relationship ◽  
High Output

In this paper, we propose a new tunable pressure sensor based on the nonlinear snap-through instability of an electrically actuated shallow arch microbeam. The general concept of the sensor can be explained as follows: the shallow arch is excited to trigger dynamic snap-through instability yielding a high output amplitude, if the system operating pressure is below a threshold value. This state is interpreted as a digital logic 1. Once the varying pressure exceeds that threshold value, the arch gains its stability. Therefore, the new state would be interpreted as a digital logic 0 value. We show an example of an operation range of the proposed sensor by identifying the relationship between the excitation AC voltage and the critical cut-off pressure.

Investigation of temperature characteristic of MEMS-based optical fiber pressure sensor

2013 ◽  
Author(s):  
Jinde Yin ◽  
Tiegen Liu ◽  
Junfeng Jiang ◽  
Kun Liu ◽  
Shuang Wang ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Pressure Sensor ◽  
Temperature Characteristic

scholarly journals An NiCr Alloy Piezoresistive Atmosphere Pressure Sensor based on Eutectic

2012 ◽  
Vol 47 ◽  
pp. 72-75 ◽  
Author(s):  
Li Dong Du ◽  
Zhan Zhao ◽  
Li Xiao ◽  
Ji Chao Chen ◽  
Zhen Fang ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Nicr Alloy ◽  
Atmosphere Pressure

scholarly journals The LBO-SBO Relationship

2020 ◽  
Vol 21 (2) ◽  
Author(s):  
Keegan Parker Brockman
Keyword(s):  
Private Equity ◽  
Negative Relationship ◽  
Data Availability ◽  
Enterprise Value ◽  
Holding Period ◽  
Significant Negative Relationship ◽  
Significant Difference ◽  
The Difference ◽  
Relative Change ◽  
The Relationship

Since the beginning of the private equity industry in the 1980s, it has evolved and adopted new strategies and methods for generating returns to investors. As the industry grew, deals became harder to find as the buyer market grew immensely and what deals remained appeared picked over. Enter the secondary buyout (SBO). This strategy involves one financial sponsor buying a portfolio company from another financial sponsor. This thesis attempts to fill a gap in the field of research in two ways. First, this thesis analyzes the difference in value creation using a longitudinal and matched-sample approach. This approach is unique in that I will only analyze data for which information on the SBO, the preceding LBO, and the following exit are all available. Second, this thesis looks specifically at the relationship between LBOs and SBOs in an attempt to provide a practical application of the analysis. Additionally, most studies stray away from performing analysis on the U.S. market due to the limited data availability, but this approach ignores one of the largest private equity markets in existence. This thesis will look solely at U.S. buyouts. I find no significant difference in the relative change in enterprise value from acquisition to exit for LBOs or SBOs. Further, there is a statistically significant negative relationship between the holding period and annualized change in EV for both LBOs and SBOs. Finally, while the results were not significant, there is a slight negative relationship between the EV change of LBOs to the EV change of SBOs.

scholarly journals THE IMPACT OF ECONOMIC, DEMOGRAPHIC, AND INFRASTRUCTURAL FACTORS ON INCOME INEQUALITY AND POVERTY IN RUSSIA

2020 ◽  
Vol 1 ◽  
pp. 70-75
Author(s):  
Rogneda Groznykh ◽  
Elena Ignatieva ◽  
Oleg Mariev ◽  
Alla Serkova
Keyword(s):  
Income Inequality ◽  
Life Expectancy ◽  
University Graduates ◽  
Russian Regions ◽  
Average Life Expectancy ◽  
Explanatory Variables ◽  
Prime Objective ◽  
Relative Change ◽  
The Impact ◽  
The Relationship

The prime objective of the research is to examine the factors influencing both the alteration in the income distribution and the relative change in the incidence of poverty in the regions of Russia. The list of the identified factors/determinants includes economic, demographic, and infrastructural factors. An econometric model, indicating the relationship between the explanatory variables with both the income inequality index and the relative poverty proportions in Russian regions has been provided in this article. The determinants that cause variations in the income inequality and poverty of a country such as social mobility, average life expectancy of urban women, life expectancy of rural men, the number of university graduates, etc. have also been specified in this study. The analysis was executed based on a dataset of 72 Russian regions for the period between 2012-2017.

Effects of Noise on the Interpolation Accuracy for Apodized FFT Spectra of Time-Domain Damped Signals

1995 ◽  
Vol 49 (12) ◽  
pp. 1776-1780 ◽  
Author(s):  
Yutaka Goto
Keyword(s):  
Time Domain ◽  
Additive Noise ◽  
Theoretical Calculations ◽  
Frequency Error ◽  
Signal To Noise ◽  
Experimental Conditions ◽  
Analog To Digital ◽  
Interpolation Accuracy ◽  
The Relationship ◽  
Relationship Equation

Interpolation formulas for the apodized magnitude-mode fast Fourier transformed (FFT) spectra determine accurately the frequency, damping constant, and amplitude of time-domain damped signals. However, additive noise causes a large amount of error in interpolation. In this paper, we obtain, theoretically, the frequency-domain signal-to-noise (S/N) ratio due to windowing by the function of sinα( X) and quantization with finite bit-length analog-to-digital (A/D) converters. Then, with the use of the squared ratios between three magnitudes nearest to the peak maximum on the apodized FFT spectrum, we derive the relationship equation between the frequency error and the S/N ratio. The results obtained by computer simulation of experimental conditions (i.e., sampling, quantization, windowing, FFT, and interpolation) for the Hanning window (α = 2) agree well with the theoretical calculations; the frequency errors decrease with increasing bit-length of the A/D converter. These observed errors are unavoidable because A/D converters are indispensable for measurements with Fourier transform spectrometers. Furthermore, as shown theoretically, the observed accuracy of interpolation is inversely proportional to the S/N ratio, provided that the S/N ratio is below the value due to quantization and windowing.

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