A Non-Linear Temperature Compensation Model for Improving the Measurement Accuracy of an Inductive Proximity Sensor and Its Application-Specific Integrated Circuit Implementation

The non-linear characteristic of a non-contacting Inductive Proximity Sensor (IPS) with the temperature affects the computation accuracy when measuring the target distance in real time. The linear model based method for distance estimation shows a large deviation at a low temperature. Accordingly, this paper presents a non-linear measurement model, which computes the target distance accurately in real time within a wide temperature range from −55 °C to 125 °C. By revisiting the temperature effect on the IPS system, this paper considers the non-linear characteristic of the IPS measurement system due to the change of temperature. The proposed model adopts a non-linear polynomial algorithm rather than the simple linear Look-Up Table (LUT) method, which provides more accurate distance estimation compared to the previous work. The introduced model is fabricated in a 0.18 μm Complementary Metal Oxide Semiconductor (CMOS) process and packaged in a CQFN40. For the most commonly used sensing distance of 4 mm, the computed distance deviation of the Application-Specific Integrated Circuit (ASIC) chips falls within the range of [−0.2,0.2] mm. According to the test results of the ASIC chips, this non-linear temperature compensation model successfully achieves real-time and high-accuracy computation within a wide temperature range with low hardware resource consumption.

[1]  Janez Trontelj,et al.  A Differential Monolithically Integrated Inductive Linear Displacement Measurement Microsystem , 2016, Sensors.

[2]  Bin Sun,et al.  Laser Displacement Sensor in the Application of Aero-Engine Blade Measurement , 2016, IEEE Sensors Journal.

[3]  A. Massarini,et al.  Laminated iron-core inductor model for time-domain analysis , 2001, 4th IEEE International Conference on Power Electronics and Drive Systems. IEEE PEDS 2001 - Indonesia. Proceedings (Cat. No.01TH8594).

[4]  Tetsuya Akagi,et al.  Development of low-cost wire type linear potentiometer for flexible spherical actuator , 2016, 2016 IEEE International Conference on Advanced Intelligent Mechatronics (AIM).

[5]  Boby George,et al.  Design and Development of a New Non-Contact Inductive Displacement Sensor , 2018, IEEE Sensors Journal.

[6]  Yi-Xin Guo,et al.  An Analog-Digital Mixed Measurement Method of Inductive Proximity Sensor , 2015, Sensors.

[7]  Miro Milanovic,et al.  High-Precision Hysteresis Sensing of the Quartz Crystal Inductance-to-Frequency Converter , 2016, Sensors.

[8]  Boby George,et al.  Self-Balancing Signal Conditioning Circuit for a Novel Noncontact Inductive Displacement Sensor , 2017, IEEE Transactions on Instrumentation and Measurement.

[9]  K. R. Sandra,et al.  A Linear Differential Inductive Displacement Sensor With Dual Planar Coils , 2019, IEEE Sensors Journal.

[10]  Yi-Xin Guo,et al.  Differential Structure of Inductive Proximity Sensor , 2019, Sensors.

[11]  Andrew D. Brown,et al.  Simulation of magnetic component models in electric circuits including dynamic thermal effects , 2002 .

[12]  Shuai Wang,et al.  A Capacitive Rotary Encoder Based on Quadrature Modulation and Demodulation , 2015, IEEE Transactions on Instrumentation and Measurement.

[13]  Guoqiang Wang,et al.  A signal conditioner IC for inductive proximity sensors , 2011, ASICON.

[14]  Yi-Xin Guo,et al.  Dimension-Reduced Analog—Digital Mixed Measurement Method of Inductive Proximity Sensor , 2017, Sensors.

[15]  Dharma Prakash Agrawal.  Embedded Sensor Systems , 2017 .

[16]  Huang Xiaozong,et al.  A signal conditioner IC for inductive proximity sensors , 2011, 2011 9th IEEE International Conference on ASIC.

[17]  J. Yonnet,et al.  Temperature effect on GMI sensor: Comparison between diagonal and off-diagonal response , 2019, Sensors and Actuators A: Physical.

[18]  Donglin Peng,et al.  An Inductive Linear Displacement Sensor Based on Planar Coils , 2018, IEEE Sensors Journal.

[19]  Galina V. Kurlyandskaya,et al.  Permalloy-Based Thin Film Structures: Magnetic Properties and the Giant Magnetoimpedance Effect in the Temperature Range Important for Biomedical Applications , 2017, Sensors.

[20]  Bala Sundaram Nauduri,et al.  A novel approach of using a planar inductive position sensor for the Permanent magnet synchronous motor control application , 2018, 2018 IEEE Sensors Applications Symposium (SAS).

[21]  Alessandro Masi,et al.  Performance Analysis of the Ironless Inductive Position Sensor in the Large Hadron Collider Collimators Environment , 2015, Sensors.

[22]  Bernhard G. Zagar,et al.  Analysis and Validation of a Planar High-Frequency Contactless Absolute Inductive Position Sensor , 2015, IEEE Transactions on Instrumentation and Measurement.

[23]  Boby George,et al.  An Efficient Digital Converter for a Non-Contact Inductive Displacement Sensor , 2018, IEEE Sensors Journal.

[24]  Jun Cai,et al.  An inductive position sensor with switched reluctance motor structure , 2017, 2017 20th International Conference on Electrical Machines and Systems (ICEMS).

[25]  F. de Leon,et al.  Time domain modeling of eddy current effects for transformer transients , 1993 .

[26]  Manel Gasulla,et al.  Timer-Based Demodulator for AM Sensor Signals Applied to an Inductive Displacement Sensor , 2017, IEEE Transactions on Instrumentation and Measurement.