A silicon field-effect hall sensor with an extended operating temperature range

The characteristics of thin-film Si MISIM magnetic transistors with a built-in accumulated channel and partially depleted quasi-neutral area are studied. The design of transistors is integrated with a Hall element. It is shown experimentally that transistors of this type, which were named field-effect Hall sensors (FEHSs) and made by the “silicon-on-insulator” (SOI) technology, provide measurements of the magnetic induction in a temperature range of 1.7–605 K. Theoretical estimates show that the upper operating temperature limit of the FEHS can be about 850 K.     

永磁同步直线电机霍尔位置检测传感器的优化

针对采用线性霍尔元件检测直线电机动子的磁场进而通过磁场信息来解算电机位置的方法,通过介绍双霍尔传感器位置检测的原理,分析由安装误差造成解算位置偏差的机理。提出采用三轴霍尔传感器代替线性霍尔传感器的方法,实现霍尔线性影响因素的误差补偿。为了降低非线性干扰造成的位置解算误差,提出了模糊-神经建模方法来实现传感器的离线标定,最后通过仿真和实验证明了所提传感器误差补偿方法的有效性。     

HALL漏磁探伤传感器的研制

基于HALL效应和电磁无损检测原理，对HALL漏磁探伤传感器的磁场信号形成与磁场信号测量进行了分析，在此基础上对传感器的整体结构设计进行了介绍。     

Self-powered wireless thermoelectric sensors

Sensors capable of measuring various performance parameters of an operational power generation unit could help improve system performance and overall efficiencies. For example, measurement of temperatures, temperature differences, or exhaust gas concentrations could provide both a quick quantitative and qualitative assessment of system health and allow for operation of power units with smaller safety margins and therefore higher efficiencies. For this study a technique is presented that can transmit data about an operational system wirelessly in real-time to an external location. For these experiments thermoelectric element leads were connected to a solenoid coil. When the thermoelectric was exposed to a temperature difference a current was generated in the thermoelectric and solenoid coil resulting in a magnetic field. A receiver was then used to measure the changes in magnetic field of the system. Two primary configurations were developed to test this wireless sensor configuration: dynamic and static. For dynamic measurements a pendulum and pneumatic air cylinder were used to simulate a moving component that may pass the external Hall sensor such as a fan or turbine blade. For dynamic measurements it was determined that for accurate results it is very important to maintain the distance constant between the Hall sensor and solenoid coil. For stationary measurements the temperature difference across the thermoelectric was related to output measurements from the Hall sensor. Overall, results show that data can be wirelessly transmitted to an external location using this method.     

Rule-based fault diagnosis of hall sensors and fault-tolerant control of PMSM

Hall sensor is widely used for estimating rotor phase of permanent magnet synchronous motor(PMSM). And rotor position is an essential parameter of PMSM control algorithm, hence it is very dangerous if Hall senor faults occur. But there is scarcely any research focusing on fault diagnosis and fault-tolerant control of Hall sensor used in PMSM. From this standpoint, the Hall sensor faults which may occur during the PMSM operating are theoretically analyzed. According to the analysis results, the fault diagnosis algorithm of Hall sensor, which is based on three rules, is proposed to classify the fault phenomena accurately. The rotor phase estimation algorithms, based on one or two Hall sensor(s), are initialized to engender the fault-tolerant control algorithm. The fault diagnosis algorithm can detect 60 Hall fault phenomena in total as well as all detections can be fulfilled in 1/138 rotor rotation period. The fault-tolerant control algorithm can achieve a smooth torque production which means the same control effect as normal control mode (with three Hall sensors). Finally, the PMSM bench test verifies the accuracy and rapidity of fault diagnosis and fault-tolerant control strategies. The fault diagnosis algorithm can detect all Hall sensor faults promptly and fault-tolerant control algorithm allows the PMSM to face failure conditions of one or two Hall sensor(s). In addition, the transitions between health-control and fault-tolerant control conditions are smooth without any additional noise and harshness. Proposed algorithms can deal with the Hall sensor faults of PMSM in real applications, and can be provided to realize the fault diagnosis and fault-tolerant control of PMSM.     

A novel magnetostrictive static force sensor based on the giant magnetostrictive material

In order to realize static force measuring and improve the sensitivity of magnetostrictive force sensor, a novel magnetostrictive static force sensor with giant magnetostrictive material rod is presented. A Hall sensor integrated in the sensor is used to measure magnetic flux density variation under force. A special structure surrounding Hall sensor is proposed to improve the sensitivity. The design method of the giant magnetostrictive force sensor is expounded firstly. The magnetic characteristics are analyzed by FEM. A model is developed based on the coupled linear magnetomechanical constitutive equations and the experimental result shows that the model is good at reflecting the force. The optimal bias magnetic field and sensitivity are studied through experiments. The sensor sensitivity is 6.14 times higher than that of the sensor which dose not have a stainless steel ring. The paper lays a foundation for the development of magnetostrictive force sensor with giant magnetostrictive material.     

Irradiation tests of ITER candidate Hall sensors using two types of neutron spectra

We report on irradiation tests of InSb based Hall sensors at two irradiation facilities with two distinct types of neutron spectra. One was a fission reactor neutron spectrum with a significant presence of thermal neutrons, while another one was purely fast neutron field. Total neutron fluence of the order of 10(16)?cm(-2) was accumulated in both cases, leading to significant drop of Hall sensor sensitivity in case of fission reactor spectrum, while stable performance was observed at purely fast neutron spectrum. This finding suggests that performance of this particular type of Hall sensors is governed dominantly by transmutation. Additionally, it further stresses the need to test ITER candidate Hall sensors under neutron flux with ITER relevant spectrum.     

高精度霍尔翼片传感器的磁路仿真与设计

采用ANSYS有限元分析软件对霍尔翼片传感器进行磁路仿真和设计。在对2AV霍尔翼片传感器进行仿真的基础上，对新型高精度Sm2Co17霍尔翼片传感器进行静态和动态仿真，并根据仿真结果进行结构调整和优化。通过磁路仿真设计，适当调整霍尔器件与永磁体之间的空气间隙，使霍尔器件、永磁体和叶片相互匹配，得到符合要求的工作点检测参数，研制出的新器件达到国外同类产品水平，满足了霍尔翼片传感器的高精度要求，成本更低，也可大批量生产。     

3-D Silicon Hall sensor for use in magnetic-based navigation systems for endovascular interventions

This paper presents the design of a new 3-D Hall sensor compatible with standard silicon IC technology and optimization of its characteristics through originally realized amperometric scheme. This magnetic Hall effect sensor is intended to be fitted at the tip of a catheter for use in a magnetic-based navigation system for endovascular interventions. Unfortunately, at present the general feeling is that vector Hall sensors cannot be used for clinical trials, mainly because of their large size and low sensitivity. Proposed 3-D silicon Hall sensor has denied suspicions with its advantages: simultaneous on line 3-D measurement of the magnetic field components; high spatial resolution 150 μm × 150 μm × 100 μm; the lowest detected magnetic induction of the three output channels is about 15/20 μT; magnetosensitivities of the three channels at a supply current 10 mA reach 360 μA/T for B_x and B_y, 250 μA/T for B_z, respectively.     

矿用圆环链焊口缺陷传感器的研制

本文研究了矿用圆环链焊口缺陷的漏磁场特性，提出了利用Ｈａｕ元件检测圆环链焊口的缺陷，设计并研制了缺陷信号识别传感器，进而可实现对圆环链的在线、实时、无损检测。     

Investigation of the magnetic field response from eddy current inspection of defects

Eddy current testing is one of the most widely used methods in non-destructive testing for the inspection of conductive materials. Numerical modelling of eddy current testing has emerged as an important approach alongside experimental studies. This paper investigates an application of numerical modelling and experimental study as a means of the quantitative non-destructive evaluation (QNDE) of defects in conductive samples. There are two methods of measuring eddy current response, more commonly by measuring the change in impedance of the eddy current probe coil, or as used in this work, by measuring the change in magnetic field directly using magnetic field sensors such as superconducting quantum interference devices, giant magneto resistance, or as in this case Hall sensors. Specifically, measurements made using an eddy current probe containing an excitation coil and a Hall sensor, experimentally obtained using an X?CY scanner table, are compared with a numerical (finite element method) model. The discrepancies between the experimental tests and the numerical models have been analysed and explained, which is an important factor in engineering applications of QNDE.     

The features of magnetosensitive sensors based on a field-effect hall probe

The possibilities of controlling the characteristics of field-effect Hall probes (FEHPs) that are based on ??silicon-on-insulator?? structures, whose design contains a field system of the ??metal-insulator-semiconductor-insulator-metal?? (MISIM) type, are considered. Adjusting the gate potential allows compensation of the residual voltage, reduction of the temperature dependence of the magnetosensitivity, minimization of the radiation effects, control of the value and dynamic range of the magnetosensitivity, and stabilization of the operating current. The use of MISIM structures in magnetic-field measurements permits the following: an induction-frequency conversion for FEHPs with the possibility to vary the operating frequency of the converter, an improvement of the signal-to-noise ratio via the gate modulation of the channel current, the use of an FEHP as the mixer in the heterodyne circuit for measuring the induction and frequency of alternating magnetic fields, and the improvement of the characteristics and data readout in multielement magnetic-field converters on the basis of an FEHP.     

基于非晶带GMI效应新型弱磁场传感器

利用退火处理后的Co66.3Fe3.7Si12B18非晶带作为敏感元件,研制出一种基于非晶带GMI效应的弱磁场传感器。分析了传感器的工作原理,设计了该传感器的信号处理电路,并对传感器的测量范围、线性度等性能进行了标定。传感器可应用于地球磁场、环境磁场等微弱磁场检测领域。     

基于霍尔传感器的中巴汽车低速检测装置

针对汽车斜坡起步辅助系统中,车辆斜坡起步过程采集数据的实时性要求,采用霍尔传感器及单片机ATmega32为主体,构成了车辆斜坡起步低速检测系统,采集的数据稳定,经信号处理后实时反映车辆的斜坡起步状态。试验结果表明,在中巴汽车的斜坡起步辅助系统中,采用本技术可有效准确采集低速斜坡起步过程的车速信号。     

霍尔式功率传感器的研究和应用

随着机床自动化的要求，各类传感器在机床上的应用日益广泛，霍尔式功率传感器的研究和在机床上的应用研究近年有所发展。本文介绍了自行研制的ＨＰＴ—３型霍尔式功率传感器的简要原理和性能，并与美国ＬＯＡＤＣＯＮＴＲＯＬＳＩＮＣＯＲＰＯＲＡＴＥＤ的ＰＨ—３Ａ型功率传感器进行对比试验和机床应用试验，得到满意效果。     

带有ABS传感器的新型轮毂轴承单元的设计

在现有第3代轮毂轴承单元基本结构的基础上,对其内部结构进行改进,并结合霍尔传感器设计了一种新型轮毂轴承单元,介绍了直接利用PRO/E的族表系列化产品及创建轮毂轴承单元的过程,最后介绍了该新型轮毂轴承单元霍尔传感器单元的设计。     

霍尔效应式曲轴位置传感器的检测

0前言曲轴位置传感器通常安装在分电器内,是发动机控制系统中最重要的传感器之一。其作用有:检测发动机转速,因此又称为转速传感器;检测活塞上止点位置,故也称为上止点传感器,包括检测用于控制点火的各缸上止点信号、用于控制顺序喷油的第一缸上止点信     

An Instrument to Control an Array of Twelve Ion-Selective Field-Effect Transistors

ABSTRACT

A computer-based instrument has been constructed which controls six integrated circuits containing twelve ion-selective field-effect transistors, and another twelve insulated-gate field-effect transistors used as controls. Each sensor is individually controlled and all the outputs are monitored simultaneously. The instrument is operated by a combination of digital input/output, analog-to-digital, and digital-to-analog conversion from a microcomputer equipped with a commercial data-acquisition board running under the Asyst software package.     

类磁栅液压缸位移传感器工作机理及仿真分析

由于类磁栅液压缸位移传感器在定量分析困难及测量精度不高等方面的不足, 使其独特的结构优势无法得到充分发挥。在充分分析其结构的基础上, 利用电磁场相关理论, 采用分子电流假说建立了永磁体数学模型, 通过Ansoft Maxwell软件对所求模型进行仿真并验证了所求模型的准确性。详细介绍两种磁敏感元件的工作原理和响应模型, 依托对敏感元件响应模型本身及工作过程仿真数据的分析, 得到霍尔元件更适合作为传感器的敏感元件及类磁栅液压缸位移传感器的测量精度与永磁体表面形状等几何尺寸密切相关等结论, 为该传感器高精度测量提供理论支撑。     

新型霍尔传感器在电流检测中的应用

相对于传统的集成霍尔传感器，磁集极霍尔传感器具有高线性度、低磁滞、高灵敏度、体积小、价格低等优点。随着该技术的推广，磁集极霍尔传感器必将广泛应用于很多领域。介绍了磁集极霍尔传感器检测电流的基本原理及应用，并且提出了对于不同范围电流检测的解决办法。