Journal ArticleDOI
A Noncontact Angle Sensor Based on Eddy Current Technique
Anup Kumar,Boby George +1 more
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TLDR
This paper presents the design and development of a novel, linear, eddy current-based noncontact angle sensor with 360° range that has no electrical contact to the rotary part and its output is immune to moisture, dust, and oil.Abstract:
This paper presents the design and development of a novel, linear, eddy current-based noncontact angle sensor with 360° range. Although the eddy current proximity sensors are known for high reliability, resolution, and insensitivity to moisture and oil, the approach has not been exploited to develop full-circle range angle sensors with such features. The proposed sensor consists of a rotary conducive hollow tube (e.g., made of aluminum) part and a stationary part with four identical flexible coils. The tube has a simple but special groove. The position of the groove modifies the value of the inductance of the stationary coil as a function of the sensing angle. The design is such that the inductance of each coil varies linearly for a specified range of the angle. From this piecewise linear characteristic, an output that is linear for the full-circle range is obtained using a simple yet effective algorithm. A suitable signal conditioning circuit is developed to obtain an output that is proportional to the change in the inductance of the coil. In order to optimize the design, first, the sensor structure was studied using finite-element analysis. Then, a prototype of the sensor was built and tested in the laboratory. The prototype sensor has a resolution of 0.08° and a maximum nonlinearity of 0.25%. The possible sources of error of the sensor have been analyzed and quantified. The sensor has no electrical contact to the rotary part and its output is immune to moisture, dust, and oil.read more
Citations
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Journal ArticleDOI
Technologies and Applications of Angle Sensors: A Review
TL;DR: A critical review of advancements made in the area of non-contact angle sensing in the last two decades shows significant progress that has been achieved in the performance aspects of angle sensors, overcoming the challenges introduced by new and specific applications.
Journal ArticleDOI
A New Method for Measuring the Rotational Angles of a Precision Spherical Joint Using Eddy Current Sensors.
TL;DR: 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.
Journal ArticleDOI
A Novel Position Sensor With a Conical Iron Core
TL;DR: A novel position sensor for pneumatic and hydraulic cylinder applications is presented in this article, and the conical solid iron core conical in shape surrounded by axisymmetric coils is an essential part of the proposed position sensor.
Journal ArticleDOI
Research on Measurement Method of Spherical Joint Rotation Angle Based on ELM Artificial Neural Network and Eddy Current Sensor
TL;DR: Zhang et al. as mentioned in this paper proposed a measurement method for the rotation angle of the spherical joint based on the extreme learning machine (ELM) artificial neural network and four eddy current sensors.
Journal ArticleDOI
Design and research of a novel non-contact vertical inductive torque sensor
TL;DR: In this paper, a non-contact vertical inductive torque sensor was built and investigated, and the effect of different rotors on the nonlinear characteristics of the sensor was analyzed based on the simulation results.
References
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Journal ArticleDOI
Automatic Test Bench for Measurement of Magnetic Interference on LVDTs
TL;DR: The test bench allows complete characterization of an LVDT sensor working in an interfering magnetic field by evaluating the uncertainty and nonlinearity of the sensor.
Journal ArticleDOI
A CMOS rotary encoder using magnetic sensor arrays
TL;DR: In this article, the magnetic field of a permanent magnet attached to the end of the rotating shaft is detected using complementary metal-oxide semiconductor (CMOS) magnetic sensors set in a square arrangement.
Journal ArticleDOI
Fiber Bragg Grating Goniometer for Joint Angle Measurement
TL;DR: In this article, a fiber Bragg grating goniometer (FBGG) is proposed, which converts the rotational motion of a joint into strain variation on a cantilever, which is acquired by the FBG sensor bonded over it.
Journal ArticleDOI
Eddy Current Probe Identification and Analysis
Felipe A. Tondo,Rodrigo Wolff Porto,Luiz Frederico S. S. M. Villalobos,Valner Joao Brusamarello,Lucíola Campestrini +4 more
TL;DR: In contrast to traditional methods of measuring reflected impedance on the probe circuit, this paper uses concepts of identification theory to find a transfer function that characterizes the dynamics of the measuring system by eddy currents.
Journal ArticleDOI
Virtual rotor grounding of capacitive angular position sensors
TL;DR: Model calculations and experimental results show that virtual grounding allows neglecting the rotor-ground resistance in a wide range.