scholarly journals Semiconductor Magnetoresistive Current Sensor for Weak Current Detection

2015 ◽  
Vol 2 ◽  
pp. 23
Author(s):  
Qi Zhou
Keyword(s):  
Effect Of Temperature ◽  
Current Sensor ◽  
Semiconductor Film ◽  
Operating Characteristics ◽  
Weak Current ◽  
Temperature Drift ◽  
Coupling Capacitance ◽  
Current Detection ◽  
The Magnetic Field ◽  
Resistance Value

<p>Made up by the combination of InSb-In eutectic magnetoresistive (MR) components, the newly designed semiconductor film magnetoresistive current sensor (MRCS) was to detect weak current with its circuit controlled by signals. This kind of current sensor simultaneously alters the resistance value of two InSb-In magnetoresistive components. Through this way, it could eliminate the coupling capacitance of ultra-large capacity and reduce the volume capacity as well as improve the frequency characteristics. Set a specified parameter through accurate calculation, and make current generate signals which form direct proportion against the magnetic field generated by the weak current of magnetoresistive alteration, reaching the goals of detecting weak current. The test analyzed this current sensor’s operating characteristics with the testing pass bands as 7-1800 Hz. It was found that the weak current reached at 10 mA and could control the effect of temperature drift effectively.</p>

THE EFFECT OF TEMPERATURE VARIATION ON RESISTANCE VALUE IN ELECTRICITY CIRCUITS

2020 ◽  
Vol 4 (1) ◽  
pp. 27
Author(s):  
Ridwan Yusuf Lubis ◽  
Lailatul Husna Lubis ◽  
Miftahul Husnah
Keyword(s):  
Temperature Variation ◽  
Effect Of Temperature ◽  
Resistance Value

scholarly journals Research on Non-Contact Weak Current Detection Technology

2018 ◽  
Vol 10 (04) ◽  
pp. 67-75
Author(s):  
Bo Chen ◽  
Sai Wu ◽  
Rui Wang ◽  
Changlei Liu ◽  
Jindong Lu ◽  
...  
Keyword(s):  
Weak Current ◽  
Detection Technology ◽  
Current Detection

A Novel Current Detection Technology for a Permanent-Magnet Brushless DC Motor

2010 ◽  
Vol 43 ◽  
pp. 274-278
Author(s):  
Zhan Shi Sheng ◽  
Jun Liang ◽  
Liang Jing ◽  
Dong Hua Zhang
Keyword(s):  
Voltage Drop ◽  
Current Sensor ◽  
Brushless Dc Motor ◽  
Power Electronic ◽  
Current Waveform ◽  
Brushless Dc ◽  
Detection Technology ◽  
Permanent Magnet Brushless Dc ◽  
Current Reconstruction ◽  
Current Detection

A novel technique for power electronic switch current detection is introduced in this paper, in which the current-sensor is replaced by electronics circuit. According to the principle that the magnitude of the switch current is proportional to its turned-on voltage drop, the proposed technique utilizes the method of grasping the turned-on voltage drop of the MOSFET to reproduce its current waveform. The appearances of voltage drop of the MOSFET are analyzed and the current reconstruction principles are introduced. Experimental results are given to validate the proposed technique. It has the characteristics of simplicity and inexpensiveness and is worthy of adoption.

scholarly journals The Development of a New Sensor for Tool Face Angle Based on Electrical Resistance

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Chuan Wu ◽  
Jian Pan ◽  
Guojun Wen
Keyword(s):  
Measurement Error ◽  
Working Conditions ◽  
Electrical Resistance ◽  
Large Temperature ◽  
Temperature Drift ◽  
Trenchless Technology ◽  
Angle Sensor ◽  
Temperature Changes ◽  
Drilling Rig ◽  
Resistance Value

Trenchless technology is a type of construction that requires pipelines to be laid in a subsurface horizontal hole drilled by a trenchless drilling rig. To prevent drilling accidents during construction, the drilling trajectory needs to be controlled in real time according to the value of the tool face angle. However, existing tool face angle sensors cannot precisely control a trenchless drilling course due to a number of limitations such as low resolution, large temperature drift, and high requirements for accurate installation. In this regard, this paper presented a new tool face angle sensor based on the change in electrical resistance value. The tests mainly include four aspects, namely, accuracy, repeatability, resolution, and temperature drift. Numbers of tests showed that the measurement error was ±6 degrees, the repeatability was 2.54%, the minimum resolution was 6 degrees, and the temperature drift had no effect during the temperature changes from 0 to 80 degrees, which proved that the sensor is applicable for practical trenchless working conditions.

Effect of temperature on magnetic susceptibility and thermodynamic properties of an asymmetric quantum dot in tilted magnetic field

2015 ◽  
Vol 29 (23) ◽  
pp. 1550127 ◽  
Author(s):  
R. Khordad
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Quantum Dot ◽  
Specific Heat ◽  
Energy Levels ◽  
Effect Of Temperature ◽  
Magnetic Field Direction ◽  
Asymmetric Quantum ◽  
Gaas Quantum Dot ◽  
The Magnetic Field

In this paper, the specific heat, entropy and magnetic susceptibility of an asymmetric GaAs quantum dot (QD) are studied under the influence of temperature and a tilted external magnetic field. We first calculate the analytical wave functions and energy levels using a transformation to simplify the Hamiltonian of the system. Then, we obtain the analytical expressions for specific heat, entropy and magnetic susceptibility as the function of temperature, magnetic field and its direction for various anisotropy of the system. According to the results obtained from the present work, we find that (i) the specific heat and entropy are decreased when the magnetic field increases. (ii) When anisotropy is increased, the specific heat and entropy decrease. (iii) At large magnetic fields, the anisotropy has not important effect on specific heat and entropy. In briefly, the magnetic field, magnetic field direction and anisotropy play important roles in the specific heat, entropy and magnetic susceptibility of an asymmetric QD.

A Non-Contacted Magnetic Sensor with Direction Memory Based on Biot-Savart Theory

2014 ◽  
Vol 487 ◽  
pp. 606-610
Author(s):  
Hui Lue Jiang ◽  
Bo Liu ◽  
Chuan Dao Liu ◽  
Jun Li Liu
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Magnetic Sensor ◽  
Drop Out ◽  
Operating Characteristics ◽  
Reed Switch ◽  
Principle Of Superposition ◽  
Response Curves ◽  
The Magnetic Field

Magnetic sensor with direction memory can be used to control the motion direction. Based on Biot-Savart theory, the magnetic field distribution expression of a bar-type in external space is derived, and the superposition distribution of both inner and outer magnet is directed by the principle of superposition, which can be used to quantitatively describe the magnetic distribution formed by inner and outer magnet, and accurately scope the effective field. According to the operating characteristics of the magnetic reed switch with different value of pull-in and drop-out, by a proper detecting distance to ensure the magnetic field strength value of inner magnet at magnetic reed switch greater than pull-in value and less than drop-out value to make magnetic reed switch maintaining the original state when outer magnet leaving. Meanwhile, by a proper detecting distance to ensure the superinposed magnetic field strength value greater than pull-in value in the forward direction, and less than drop-out value in backward direction. Calculation of response curves show the impacts of magnet size, response intensity and detecting distance variation on the sensor.

A New Approach about Heat Transfer of Hot-Wire Anemometer

2012 ◽  
Vol 232 ◽  
pp. 747-751 ◽  
Author(s):  
Mojtaba Dehghan Manshadi ◽  
Mohamad Kazemi Esfeh
Keyword(s):  
Heat Transfer ◽  
Ambient Temperature ◽  
Air Flow ◽  
Accurate Method ◽  
Fundamental Principle ◽  
Effect Of Temperature ◽  
Hot Wire ◽  
Temperature Drift ◽  
Flow Temperature ◽  
Temperature Variations

The hot-wire anemometer is a famous thermal transducer for turbulence measurements. The fundamental principle of hot-wire anemometer is based on the convective heat transfer, since the heat transfer is directly proportional to the temperature difference between the sensor and the fluid, hence ambient temperature variations are one of the most important error sources in the measurements with the hot-wire anemometers. Many methods have been proposed to compensate for the ambient temperature variations. In such methods the effect of temperature drift is only considered and the effect of Nusselt number is ignored. In the present research the effect of air flow temperature variations on the response of constant temperature anemometer has been studied experimentally. Furthermore, with the basis of air flow velocity and ambient temperature variations, the percentage errors in velocity measurements have been estimated. Finally, based on achieved results, an accurate method has been proposed to compensate the air flow temperature variations.

Technique for Compensation of Temperature Drift in Thermal Excited Si-Based Resonant Pressure Sensor

2011 ◽  
Vol 483 ◽  
pp. 224-227 ◽  
Author(s):  
Zheng Yuan Zhang ◽  
Yong Mei ◽  
Jian Gen Li ◽  
Xiao Gang Li ◽  
Zhi Cheng Feng
Keyword(s):  
Temperature Variation ◽  
Pressure Sensor ◽  
Preliminary Test ◽  
Effect Of Temperature ◽  
Test Results ◽  
Temperature Drift ◽  
Pressure Sensing ◽  
Dual Beam ◽  
Resonant Beam ◽  
Sensor Structure

A Si-based resonant pressure sensor structure with dual-beam was proposed to solve the problem of serious temperature drift in thermal excited Si-based resonant pressure sensor. In this structure, temperature variation sensed by non-pressure-sensing resonant beam was subtracted from that sensed by pressure-sensing beam, to cancel variations of the pressure-sensing beam with temperature and compensate for temperature drift of thermal-excited Si-based resonant pressure sensor. A prototype of Si-based resonant pressure sensor with dual-beam was developed. Preliminary test results showed that the effect of temperature drift was reduced to 1/30 of the uncompensated device, greatly improving sensing accuracy of thermal excited Si-based resonant pressure sensor.

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