scholarly journals A New Method for Measuring the Rotational Angles of a Precision Spherical Joint Using Eddy Current Sensors

Sensors ◽  
2020 ◽  
Vol 20 (14) ◽  
pp. 4020 ◽  
Author(s):  
Penghao Hu ◽  
Linchao Zhao ◽  
Chuxin Tang ◽  
Shanlin Liu ◽  
Xueming Dang ◽  
...  
Keyword(s):  
Eddy Current ◽  
Output Signal ◽  
Sensor Array ◽  
Mechanical Performance ◽  
Model Simulation ◽  
Current Sensor ◽  
Parallel Mechanisms ◽  
Spherical Joint ◽  
Eddy Current Sensor ◽  
Current Sensors

Precision spherical joint is a spherical motion pair that can realize rotation with three degrees of freedom. This joint is widely used in robots, parallel mechanisms, and high-end medical equipment, as well as in aerospace and other fields. However, the rotation orientation and angle cannot be determined when the joint is in passive motion. The real-time determination of the rotation orientation and angle is crucial to the improvement of the motion control accuracy of the equipment where the joint is installed in. In this study, a new measurement method that utilizes eddy current sensors is proposed to identify the special features of the joint ball and realize angle measurements indirectly. The basic idea is to manufacture the specific shape features on the ball without affecting its movement accuracy and mechanical performance. An eddy current sensor array is distributed in the ball socket. When the ball head rotates, the features on the ball opposite to the sensor, as well as the output signal of every eddy current sensor, change. The measurement model that establishes the relationship between the output signal of the eddy current sensor array and the rotation direction and angle of the ball head is constructed by learning and training an artificial neural network. A prototype is developed using the proposed scheme, and the model simulation and feasibility experiment are subsequently performed. Results show that the root mean square angular error of a single axis within a range of ±14° is approximately 20 min, which suggests the feasibility of the proposed method.

scholarly journals Fatigue Crack Length Sizing Using a Novel Flexible Eddy Current Sensor Array

Sensors ◽  
2015 ◽  
Vol 15 (12) ◽  
pp. 32138-32151 ◽  
Author(s):  
Ruifang Xie ◽  
Dixiang Chen ◽  
Mengchun Pan ◽  
Wugang Tian ◽  
Xuezhong Wu ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Crack Length ◽  
Eddy Current ◽  
Sensor Array ◽  
Current Sensor ◽  
Eddy Current Sensor

Planar Eddy Current Sensor Array With Null-Offset

2019 ◽  
Vol 19 (12) ◽  
pp. 4647-4651 ◽  
Author(s):  
Lihui Liu ◽  
Dixiang Chen ◽  
Mengchun Pan ◽  
Wugang Tian ◽  
Wei Wang ◽  
...  
Keyword(s):  
Eddy Current ◽  
Sensor Array ◽  
Current Sensor ◽  
Eddy Current Sensor

Effect of Conformable Substrate Thickness on an Eddy Current Sensor Array’s Output Characteristics

2011 ◽  
Vol 335-336 ◽  
pp. 1503-1507
Author(s):  
Jin Qiang Du ◽  
Yu Ting He ◽  
Hua Ding ◽  
Hai Wei Zhang ◽  
Li Ming Wu
Keyword(s):  
Finite Element ◽  
Eddy Current ◽  
Sensor Array ◽  
Element Model ◽  
Current Sensor ◽  
Substrate Thickness ◽  
Eddy Current Sensor ◽  
Sensor Fabrication ◽  
Output Characteristics ◽  
Couple Method

A finite element model of an eddy current sensor array is built up by electromagnetic-circuit couple method, and the influences of conformable substrate thickness on sensor’s output characteristics are analyzed by the model. It is shown that the amplitude of sensing coils’ output would diminish as substrate thickness increased, besides, the discrepancies of sensing coils’ output also decrease when the substrate becoming thicker. Therefore tt is necessary to make the conformable substrate as thin as possible in sensor fabrication process to enhance the crack inspecting ability of the sensor.

Simulation Analysis of Conformable Substrate on an Eddy Current Sensor Array’s Output Characteristics Based on Finite Element Method

2011 ◽  
Vol 130-134 ◽  
pp. 2724-2728
Author(s):  
Jin Qiang Du ◽  
Yu Ting He ◽  
Hua Ding ◽  
Li Ming Wu ◽  
Qing Shao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Eddy Current ◽  
Sensor Array ◽  
Simulation Analysis ◽  
Current Sensor ◽  
Finite Element Models ◽  
Eddy Current Sensor ◽  
Output Characteristics ◽  
Couple Method

Finite element models of an eddy current sensor array are built up by electromagnetic-circuit couple method, and the influences of conformable substrate on sensor’s output characteristics are analyzed by those models. It is shown that the model contains the conformable substrate has almost the same output characteristics as the model without it, but the output amplitudes and phases of the former model are higher than the latter. Therefore we can simply the sensor as a single surface to facilitate the analysis, and then revise it to fit to the real sensor.

CALCULATION OF THE PARAMETERS OF THE WIND TURBINE ROTOR EDDY CURRENT SENSOR

2021 ◽  
Vol 118 (3) ◽  
pp. 134-141
Author(s):  
Аlina Fazylova
Keyword(s):  
Wind Turbine ◽  
Eddy Current ◽  
Turbine Rotor ◽  
Current Sensor ◽  
Eddy Current Sensor ◽  
Turbine Shaft ◽  
Current Sensors ◽  
Strong Winds ◽  
Hostile Environments ◽  
Wind Turbine Rotor

Eddy current sensors are used to measure shaft clearance in wind turbines and to check that there is a thin film of oil in the clearance. In this case, the oil is usually applied under pressure. Because the eddy current sensors are resistant to oil, pressure and temperature, this allows them to operate reliably in these hostile environments. When the gap becomes too large, a maintenance warning is generated. Eddy current sensors help detect axial and radial deflection of the turbine shaft. Radial movement occurs when the shaft is off-center. Axial movement indicates that the shaft is tilted relative to the central axis. Both cannot be eliminated completely. However, with significant deviations, increased bearing wear occurs. If such situations are detected, the turbine should be shut down as soon as possible for maintenance, even before an accident occurs. Finally, eddy current sensors are used to measure forces or torques applied to the nacelle. These influences can be caused by vibration, wind loads or other factors that, over time, can lead to the destruction of the entire structure. Eddy current sensors can also be used to measure axial, radial or tangential deflection of clutch discs, which ensure the safety of the rotor in the event of strong winds. This article provides a method for calculating an inductive sensor. This calculation will allow you to correctly develop a wind turbine eddy current sensor.

Simulation Analysis of an Eddy Current Sensor Array Based on Finite Element Method

2011 ◽  
Vol 299-300 ◽  
pp. 1072-1077
Author(s):  
Jin Qiang Du ◽  
Yu Ting He ◽  
Hua Ding ◽  
Hai Wei Zhang ◽  
Li Ming Wu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Eddy Current ◽  
Sensor Array ◽  
Simulation Analysis ◽  
Element Model ◽  
Current Sensor ◽  
Eddy Current Sensor ◽  
Output Characteristics ◽  
Couple Method

A finite element model of an eddy current sensor array is built up by electromagnetic-circuit couple method, and the influences of crack length and frequency on sensor’s output characteristics are analyzed by this model. It is shown that the model established in this paper is reasonable. There would be a change on amplitude and phase when a crack appears below the footprint of sensing coil in metal plane, and the amplitude and phase of sensor coil are increasing gradually as crack propagation. As frequency increased, the differences between the sensing coils’ output become obvious. However, the differences begin decreasing while the frequency above 3MHz approximately. These results will provide a reference for further research and application of the sensor.

Rapid prototyping eddy current sensors using 3D printing

2018 ◽  
Vol 24 (1) ◽  
pp. 106-113 ◽  
Author(s):  
Bo Li ◽  
Lifan Meng ◽  
Hongyu Wang ◽  
Jing Li ◽  
Chunmei Liu
Keyword(s):  
3D Printing ◽  
Rapid Prototyping ◽  
Eddy Current ◽  
Fused Deposition Modeling ◽  
Current Sensor ◽  
Content Type ◽  
Fused Deposition ◽  
Eddy Current Sensor ◽  
3D Printed ◽  
Current Sensors

Purpose The purpose of this paper is to investigate the process of rapid prototyping eddy current sensors using 3D printing technology. Making full use of the advantages of 3D printing, the authors study on a new method for fabrication of an eddy current sensor. Design/methodology/approach In this paper, the authors establish a 3D model using SolidWorks. And the eddy current sensor is printed by the fused deposition modeling method. Findings Measurement results show that the 3D printing eddy current sensor has a wider linear measurement range and better linearity than the traditional manufacturing sensor. Compared to traditional eddy current sensor fabrication method, this 3D printed sensor can be fabricated at a lower cost, and the fabrication process is more convenient and faster. Practical implications This demonstrated 3D printing process can be applied to the 3D printing of sensors of more sophisticated structures that are difficult to fabricate using conventional techniques. Originality/value In this work, the process of rapid prototyping eddy current sensors using 3D printing is presented. Sensors fabricated with the 3D printing possess lots of merits than traditional manufactures. 3D printed sensors can be customized according to the configuration of the overall system, thus reducing the demand of sensor's rigid mounting interfaces. The 3D printing also reduce design costs as well as shortens the development cycle. This allows for quick translation of a design from concept to a useful device.

scholarly journals Analysis of Tilt Effect on Notch Depth Profiling Using Thin-Skin Regime of Driver-Pickup Eddy-Current Sensor

Sensors ◽  
2021 ◽  
Vol 21 (16) ◽  
pp. 5536
Author(s):  
Mingyang Lu ◽  
Xiaobai Meng ◽  
Ruochen Huang ◽  
Anthony Peyton ◽  
Wuliang Yin
Keyword(s):  
Eddy Current ◽  
Tilt Angle ◽  
Depth Profiling ◽  
Current Sensor ◽  
Notch Depth ◽  
Measured Voltage ◽  
Eddy Current Sensor ◽  
Thin Skin ◽  
Different Depths ◽  
Current Sensors

Electromagnetic eddy current sensors are commonly used to identify and quantify the surface notches of metals. However, the unintentional tilt of eddy current sensors affects results of size profiling, particularly for the depth profiling. In this paper, based on the eddy current thin-skin regime, a revised algorithm has been proposed for the analytical voltage or impedance of a tilted driver–pickup eddy current sensor scanning across a long ideal notch. Considering the resolution of the measurement, the bespoke driver–pickup, also termed as transmitter–receiver (T-R) sensor is designed with a small mean radius of 1 mm. In addition, the T-R sensor is connected to the electromagnetic instrument and controlled by a scanning stage with high spatial travel resolution, with a limit of 0.2 μm and selected as 0.25 mm. Experiments were conducted for imaging of an aluminium sheet with seven machined long notches of different depths using T-R sensor under different tilt angles. By fitting the measured voltage (both real and imaginary part) with proposed analytical algorithms, the depth profiling of notches is less affected by the tilt angle of sensors. From the results, the depth of notches can be retrieved within a deviation of 10% for tilt angles up to 60 degrees.

Sign in / Sign up

Export Citation Format

Share Document