scholarly journals Research of Probability-Based Tunneling Magnetoresistive Sensor Static Hysteresis Model

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7672
Author(s):  
Yutao Li ◽  
Liliang Wang ◽  
Hao Yu ◽  
Zheng Qian
Keyword(s):  
Small Volume ◽  
High Sensitivity ◽  
High Accuracy ◽  
High Order ◽  
Preisach Model ◽  
Hysteresis Model ◽  
Broad Application ◽  
Magnetoresistive Sensor ◽  
Hysteresis Characteristics ◽  
Application Prospects

Tunneling magnetoresistive (TMR) sensors have broad application prospects because of their high sensitivity and small volume. However, the inherent hysteresis characteristics of TMR affect its applications in high accuracy scenarios. It is essential to build a model to describe the attributes of hysteresis of TMR accurately. Preisach model is one of the popular models to describe the behavior of inherent hysteresis for TMR, whereas it presents low accuracy in high-order hysteresis reversal curves. Furthermore, the traditional Preisach model has strict congruence constraints, and the amount of data seriously affects the accuracy. This paper proposes a hysteresis model from a probability perspective. This model has the same computational complexity as the classic Preisach model while presenting higher accuracy, especially in high-order hysteresis reversal curves. When measuring a small amount of data, the error of this method is significantly reduced compared with the classical Preisach model. Besides, the proposed model’s congruence in this paper only needs equal vertical chords.

Design of Multi-Parameter Environmental Monitoring Instrument Based on Labview

2013 ◽  
Vol 433-435 ◽  
pp. 519-526
Author(s):  
Chun Fen Guo ◽  
A Ying Wei ◽  
Xue Zhen Cheng
Keyword(s):  
Environmental Monitoring ◽  
Single Crystal ◽  
Gas Sensor ◽  
Small Volume ◽  
High Sensitivity ◽  
High Accuracy ◽  
Signal Acquisition ◽  
Price Ratio ◽  
Serial Port ◽  
Monitoring Instrument

For instrument multifunction, this article introduces a new multi-parameter environmental monitoring instrument. This article chooses the electrochemistry gas sensor as signal acquisition element which has the characteristics of small volume, high sensitivity. Using a single crystal designed as PM2.5 detection module. It can measure SO2NO2COH2S and PM2.5 meanwhile. It simply and exactly achieved the measurement of every parameter by designing related circuits. The communication between computer and Labview was realized by serial port. This instrument has high accuracy, small volume, and higher performance price ratio and so on.

scholarly journals Hysteresis Modeling and Compensation of Fast Steering Mirrors with Hysteresis Operator Based Back Propagation Neural Networks

Micromachines ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 732
Author(s):  
Kairui Cao ◽  
Guanglu Hao ◽  
Qingfeng Liu ◽  
Liying Tan ◽  
Jing Ma
Keyword(s):  
Neural Network ◽  
Back Propagation ◽  
Hysteresis Model ◽  
Cooperative Movement ◽  
Hysteresis Operator ◽  
The Neural Network ◽  
Hysteresis Nonlinearity ◽  
Hysteresis Modeling ◽  
Hysteresis Characteristics ◽  
Inverse Hysteresis

Fast steering mirrors (FSMs), driven by piezoelectric ceramics, are usually used as actuators for high-precision beam control. A FSM generally contains four ceramics that are distributed in a crisscross pattern. The cooperative movement of the two ceramics along one radial direction generates the deflection of the FSM in the same orientation. Unlike the hysteresis nonlinearity of a single piezoelectric ceramic, which is symmetric or asymmetric, the FSM exhibits complex hysteresis characteristics. In this paper, a systematic way of modeling the hysteresis nonlinearity of FSMs is proposed using a Madelung’s rules based symmetric hysteresis operator with a cascaded neural network. The hysteresis operator provides a basic hysteresis motion for the FSM. The neural network modifies the basic hysteresis motion to accurately describe the hysteresis nonlinearity of FSMs. The wiping-out and congruency properties of the proposed method are also analyzed. Moreover, the inverse hysteresis model is constructed to reduce the hysteresis nonlinearity of FSMs. The effectiveness of the presented model is validated by experimental results.

scholarly journals A High Sensitivity Self-Powered Wind Speed Sensor Based on Triboelectric Nanogenerators (TENGs)

Sensors ◽  
2021 ◽  
Vol 21 (9) ◽  
pp. 2951
Author(s):  
Yangming Liu ◽  
Jialin Liu ◽  
Lufeng Che
Keyword(s):  
Wind Speed ◽  
High Sensitivity ◽  
Electrical Signal ◽  
Geometrical Parameters ◽  
Sensor Systems ◽  
Speed Sensor ◽  
Speed Range ◽  
Self Powered ◽  
Triboelectric Nanogenerators ◽  
Application Prospects

Triboelectric nanogenerators (TENGs) have excellent properties in harvesting tiny environmental energy and self-powered sensor systems with extensive application prospects. Here, we report a high sensitivity self-powered wind speed sensor based on triboelectric nanogenerators (TENGs). The sensor consists of the upper and lower two identical TENGs. The output electrical signal of each TENG can be used to detect wind speed so that we can make sure that the measurement is correct by two TENGs. We study the influence of different geometrical parameters on its sensitivity and then select a set of parameters with a relatively good output electrical signal. The sensitivity of the wind speed sensor with this set of parameters is 1.79 μA/(m/s) under a wind speed range from 15 m/s to 25 m/s. The sensor can light 50 LEDs at the wind speed of 15 m/s. This work not only advances the development of self-powered wind sensor systems but also promotes the application of wind speed sensing.

Compactability Analysis of Soil-Rock Mixture

2013 ◽  
Vol 423-426 ◽  
pp. 1001-1005
Author(s):  
Lin Ping Yu ◽  
Zhi Yun Wang
Keyword(s):  
Influencing Factors ◽  
Building Material ◽  
Engineering Properties ◽  
Broad Application ◽  
Compaction Test ◽  
Object Of Study ◽  
Application Prospects

With soil-rock mixture (SRM) as the object of study and compaction test as the means, the paper studies the compactability of the SRM and analyzes the compactability influencing factors and engineering properties after compaction. Studies show that the soil engineering properties of compacted SRM are greatly improved, so it is a building material with broad application prospects.

The Design and Implementation of Tri-Axial Magnetometer

2013 ◽  
Vol 663 ◽  
pp. 632-637
Author(s):  
Jia Wen Liu ◽  
Qing Hua Zhou ◽  
Li Li ◽  
Tao Li
Keyword(s):  
Real Time ◽  
Peak Power ◽  
High Sensitivity ◽  
High Accuracy ◽  
Low Power Consumption ◽  
Serial Port ◽  
Time Curve ◽  
Data Process ◽  
Transfer Unit ◽  
Measurement Results

The design, implementation, and testing of a tri-axial magnetometer instrument are introduced. The design is based on the MAG3110 chip. This chip has the properties of low power consumption and high resolution in the conventional mode. It runs with the peak power at 86.4μJ and the resolution of 0.1μT. The 12C5A60S2 MCU is chose as the data process and transfer unit. The data from the MCU is received by the principal computer through serial port. The measurement results, including the strength and the three component of magnetic field are displayed on PC by real-time curve through a VB programmed interface. The comparison between the measurements and the theoretical values shows that this instrument has the characteristic of high accuracy, high sensitivity and real-time display.

Quantum blockchain system

2021 ◽  
pp. 2150343
Author(s):  
Xiao-Jun Wen ◽  
Yong-Zhi Chen ◽  
Xin-Can Fan ◽  
Zheng-Zhong Yi ◽  
Zoe L. Jiang ◽  
...  
Keyword(s):  
Quantum Teleportation ◽  
Secure Communication ◽  
Quantum Computers ◽  
Computing Power ◽  
Broad Application ◽  
Digital Currency ◽  
Blockchain Technology ◽  
Quantum Secure Communication ◽  
Complexity Problem ◽  
Application Prospects

Blockchain technology represented by Bitcoin and Ethereum has been deeply developed and widely used due to its broad application prospects such as digital currency and IoT. However, the security of the existing blockchain technologies built on the classical cryptography depends on the computational complexity problem. With the enhancement of the attackers’ computing power, especially the upcoming quantum computers, this kind of security is seriously threatened. Based on quantum hash, quantum SWAP test and quantum teleportation, a quantum blockchain system is proposed with quantum secure communication. In classical cryptographic theory sense, the security of this system is unconditional since it has nothing to do with the attackers’ computing power and computing resources.

MoS2 nanosheets chemically modified with metal phthalocyanine via mussel-inspired chemistry for multifunctional memristive devices

2021 ◽  
Author(s):  
Qing Yan ◽  
Fei Fan ◽  
Chen Sun ◽  
Mohamed E. El-Khouly ◽  
Hongfei Liu ◽  
...  
Keyword(s):  
Artificial Intelligence ◽  
Metal Phthalocyanine ◽  
Mos2 Nanosheets ◽  
Broad Application ◽  
Chemically Modified ◽  
Application Prospects

Memristive devices with in-memory computing functions have broad application prospects in the field of artificial intelligence. The development of memristive devices that integrate multi-functions of nonvolatile rewritable memory and biomimicking...

Piezo Actuator Hybrid Modeling for Nonlinear Inverse Control in Diamond Turning

1999 ◽  
Author(s):  
Dongwoo Song ◽  
C. James Li
Keyword(s):  
Pid Control ◽  
Inverse Dynamics ◽  
Feedforward Control ◽  
Diamond Turning ◽  
Piezo Actuator ◽  
Positioning System ◽  
Preisach Model ◽  
Hysteresis Model ◽  
Inverse Control ◽  
Spring Mechanism

Abstract This paper describes a micro-positioning system based on piezo actuators and a spring mechanism, and a hybrid hysteresis model integrating a neural network and Preisach model to identify the inverse dynamics of the micro-positioning system. To improve the workpiece form accuracy in diamond turning, feedforward control using the hybrid inverse model and feedback PID control were applied individually and in combination. The performance of these controllers are compared in actual cutting tests.

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