A Linear Differential Inductive Displacement Sensor With Dual Planar Coils

Sandra, K. R.; Kumar, Arvind; George, Boby; Kumar, V. Jagadeesh

doi:10.1109/jsen.2018.2877209

Cited by 24 publications

(7 citation statements)

References 24 publications

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“…After the processing of the LPFs and amplifiers, high frequency components of signal ( 5) to (8) are removed. The residual signals can be expressed as ( 9) to (12), which are low frequency signals related to angular displacement.…”

Section: B Measurement Principlementioning

confidence: 99%

“…According to (9) to (12), two outputs of every sense channel should be quadrature sine signals with same amplitude before inputting to the FPGA for arctangent operation. However, if the signals for arctangent operation have quadrature or amplitude problems, there will be errors introduced in angle measurement.…”

Section: Analysis Of Second-order Errormentioning

confidence: 99%

“…The accuracy of this sensor is not high and it still has drawbacks of capacitive based sensor due to its capacitive sense channel. Another linear displacement with similar components as [11] is reported in [12], differently it employs an E-shape ferromagnetic core to move and alter the inductances of two coils on a couple of PCBs to measure displacement. The sensor requires a couple of stator PCBs with fine assembling.…”

Section: Introductionmentioning

confidence: 99%

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A Contactless Planar Inductive Sensor for Absolute Angular Displacement Measurement

Gao¹,

Shi²,

Tang³

2021

IEEE Access

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This paper proposes a new planar inductive sensor with printed circuit boards (PCB) based stator and rotor, which can perform more precision measurement than traditional inductive angular displacement sensors. The sensor uses PCB technique to realize accurately configured planar coils. The stator consists of a ferromagnetic base plate and a PCB with three groups of circular excitation coils and two groups of sine shape pickup coils working as two sense channels. The rotor consists of a ferromagnetic base plate and a PCB with two circles of copper pieces. Copper pieces on the rotor PCB produce eddy current in the time-varying magnetic field and alter the outputs of two sense channels of pickup coils cyclically with the rotor's rotation. Two fine sense channels can make incremental angle measurement individually and work together to make absolute angle measurement. A prototype with 63 and 64 period sense channels was designed and developed for experiments, and test results show that it was finally examined with short-period error of 14.7" and full range error of 20.6". The possessed characteristics of inductive principle, absolute measuring and good accuracy make this type of sensor is very suitable for high precision, reliable measurement in harsh environments.

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Section: B Measurement Principlementioning

confidence: 99%

Section: Analysis Of Second-order Errormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Contactless Planar Inductive Sensor for Absolute Angular Displacement Measurement

Gao¹,

Shi²,

Tang³

2021

IEEE Access

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“…An unbalance compensation circuit is added to increase the stability and accuracy of the conditioning circuit’s output signal. Sandra et al studied an inductive displacement transducer consisting of a circuit board planar coil and an E-type soft iron core [ 3 ]. The movement of the plane coil causes a change in inductance, and the inductance value characterizes the displacement.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Coil Excitation Method on the Performance of a Dual-Coil Inductive Displacement Transducer

et al. 2023

Sensors

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A dual-coil inductive displacement transducer is a non-contact type measuring element for measuring displacement and is widely used in large power equipment systems such as construction machinery and agricultural equipment. However, the effect of the coil excitation method on the performance of dual-coil inductive displacement sensors has not been studied. This paper investigates the impact of different coil excitation methods on the operating performance of displacement transducers. The working principle, electromagnetic characteristics, and electrical characteristics were analyzed by building a mathematical model. A transducer measurement device was used to determine the relationship between core displacement and coil inductance. Three coil excitation methods were proposed, and the effects of the three coil excitation methods on the amplitude variation, phase shift, linearity, and sensitivity of the output signal were studied by simulation based on the AD630 chip as the core of the conditioning circuit. Finally, the study’s feasibility was demonstrated by comparing the experiment to the simulation. The results show that, under the uniform magnetic field strength distribution in the coil, the coil voltage variation is proportional to the inductive core displacement. The amplitude variation is the largest for the dual-coil series three-wire (DCSTW) and is the same for the dual-coil series four-wire (DCSFW) and dual-coil parallel differential (DCPD). DCSFW has an enormous phase shift. DCSTW has the best linearity. The research in this paper provides a theoretical basis for selecting a suitable coil excitation, which is conducive to further improving the operating performance of dual-coil inductive displacement transducers.

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“…A non-contact inductive linear displacement sensor [18] is presented, which is based on planar coils realized by the Printed Circuit Board (PCB) technique. A non-contact displacement sensor employing a couple of planar coils etched on PCB and an E-type soft ferromagnetic core is proposed [19], which provides an output that varies linearly with the displacement. These innovations put more attention on improving the structure of the model.…”

Section: Introductionmentioning

confidence: 99%

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

Wang

Tao

Dong

et al. 2020

Sensors

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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.

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A Linear Differential Inductive Displacement Sensor With Dual Planar Coils

Cited by 24 publications

References 24 publications

A Contactless Planar Inductive Sensor for Absolute Angular Displacement Measurement

A Contactless Planar Inductive Sensor for Absolute Angular Displacement Measurement

Effect of the Coil Excitation Method on the Performance of a Dual-Coil Inductive Displacement Transducer

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

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