A Novel Inductive Angular Displacement Sensor With Multi-Probe Symmetrical Structure

Sun, Shu-Ming; Han, Yu; Zhang, Hui; He, Zeyin; Tang, Qifu

doi:10.1109/jsen.2021.3140126

Cited by 10 publications

(4 citation statements)

References 26 publications

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“…As shown in Figure 1, the fixed reading head is located at position P 1 , and the adjustable reading head is located at position P n . The theoretical angle between the two reading heads is β n, 1 , and the actual angle between the two reading heads is β. the m reading heads are used to eliminate harmonic errors other than k = c × m order (c = 1, 2, 3,...) [21][22][23].…”

Section: Calculation Methods For Actual Angle Between Reading Headsmentioning

confidence: 99%

Self-Calibration Method for Circular Encoder Based on Two Reading Heads with Adjustable Positions

Wang,

Zhao,

Xiao

et al. 2024

Machines

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To improve the measuring accuracy of circular encoders in special applications, self-calibration of the circular encoder is necessary. The commonly used self-calibration method, namely the Equal Division Average (EDA) method, requires a large number of reading heads and cannot be used when the structural space is limited. In this paper, a self-calibration method for a circular encoder based on two reading heads with adjustable positions (TRAP) is proposed. This TRAP method uses two reading heads to simulate multiple reading heads, which can be used to achieve self-calibration of circular encoders in limited space. This paper investigates the principle of simulating multiple reading heads with two reading heads, designs and builds an experimental system, and obtains and analyzes experimental data. The experimental results show that the peak-valley value of the angle measurement error is reduced from 252.41″ to 18.82″ after self-calibration with the TRAP method, and the repeatability of multiple self-calibration experimental results is less than 0.75″. The TRAP method breaks through the limitation of the number of reading heads that can be installed during the self-calibration of the circular encoder and can effectively suppress the angle measurement error of the circular encoder.

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Section: Calculation Methods For Actual Angle Between Reading Headsmentioning

confidence: 99%

Self-Calibration Method for Circular Encoder Based on Two Reading Heads with Adjustable Positions

Wang,

Zhao,

Xiao

et al. 2024

Machines

View full text Add to dashboard Cite

show abstract

“…Optical methods predominantly depend on the disk encoder scheme, commonly denoting the grating encoder arrangement, which employs a grating disk configuration for measurement purposes [ 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. Previous researchers have conducted a lot of research on it, including structural optimization [ 36 ] and algorithm supplementary modifications [ 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 ].…”

Section: High-precision With Single Axismentioning

confidence: 99%

A Review: High-Precision Angle Measurement Technologies

Wang,

Ma,

Cao

et al. 2024

Sensors

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Angle measurement is an essential component of precision measurement and serves as a crucial prerequisite for high-end manufacturing. It guides the implementation of precision manufacturing and assembly. The current angle measurement methods mainly focus on multiple axes, high precision, and large measurement ranges. This article introduces the technology of angle measurement from the perspectives of single-axis and multi-axis measurement schemes. Firstly, the single-axis measurement scheme is primarily achieved through optical methods, such as encoder discs that measure energy changes and interferometric phase changes, as well as mechanical, electromagnetic, and inertial angle measurement methods, among which interferometric methods offer the highest accuracy, with high cost, and encoder discs provide the largest measurement range with an ordinary price. Secondly, in the multi-axis measurement scheme, autocollimation instruments, including plane mirrors, gratings, and self-designed targets, are the main options. Although grating encoders can achieve three degrees of freedom in angle measurement with an ordinary price, they are limited in terms of measurement range and sensitivity compared to self-designed targets. Lastly, artificial intelligence assistance precision measurement is increasingly being embraced due to significant advancements in computer performance, making it more convenient to identify the relationship between measured values and detection values. In conclusion, angle measurement plays a crucial role in precision manufacturing, and the evolving and improving technologies provide the manufacturing industry with greater choices. The purpose of this review is to help readers quickly find more suitable technical solutions according to current application requirements, such as single/multiple axes, accuracy level, measuring range, budget, etc.

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“…However, that method cannot effectively eliminate the higher-order components of the angle measurement error of the circular encoder. Sun S-Z et al [28] proposed a self-calibration method based on the error phase shift (EPS), based on the principle of circumferential space closure, taking the starting measured value sequence as the error shift reference, transforming the error sequence at equal intervals, and obtaining the functional relationship between the error and the reference. However, that method requires uniform motion of the object to be measured.…”

Section: Introductionmentioning

confidence: 99%

Self-Calibration Method for Circular Encoders Based on Inertia and a Single Read-Head

Wang,

Xiao,

Zheng

et al. 2024

Sensors

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This article proposes a new self-calibration method for circular encoders based on inertia and a single read-head. The velocity curves of the circular encoder are fitted with polynomials and, based on the principle of circle closure and the periodicity of the distribution for angle intervals, the proportionality between the theoretical value and the actual value of each angle interval is obtained. In the experimental system constructed, the feasibility of the proposed method was verified through self-calibration experiments, repeatability experiments, and comparative experiments with the time-measurement dynamic reversal (TDR) method. In addition, this article also proposes an iterative method to improve the self-calibration accuracy. Experimental verification was carried out, and the results show that the new method can effectively compensate for the error of angle measurement in the circular encoder. The peak-to-peak value of the error of angle measurement was reduced from 239.343” to 11.867”, and the repeatability of the calibration results of the new method was less than 2.77”.

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A Novel Inductive Angular Displacement Sensor With Multi-Probe Symmetrical Structure

Cited by 10 publications

References 26 publications

Self-Calibration Method for Circular Encoder Based on Two Reading Heads with Adjustable Positions

Self-Calibration Method for Circular Encoder Based on Two Reading Heads with Adjustable Positions

A Review: High-Precision Angle Measurement Technologies

Self-Calibration Method for Circular Encoders Based on Inertia and a Single Read-Head

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