A Novel Approach of an Absolute Encoder Coding Pattern

Dziwiński, Tomasz

doi:10.1109/jsen.2014.2345587

Cited by 47 publications

(10 citation statements)

References 10 publications

(8 reference statements)

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“…Many improvements of the gray code based pattern is reported [12][13][14][15]. Digital absolute rotary sensors which are not only accurate, light, small, and insensitive to EM interference but also characterized by their high resolution are reported, however, in these sensors, the encoder design is complex and contains numerous parts such as several light sources or an array of photo-detectors in the detection scheme [16][17][18][19][20]. Image rotary position encoder needs image sensor and image processing system to decode the response of the sensor from the coded information [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Novel Absolute Rotary Position Sensor Based on Combination of Gray Scale Pattern Disc

Choe

et al. 2021

Preprint

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Absolute rotary angular /position sensors play an important role in various applications and rapid development of new technologies requires further accurate measurement and control. In this paper, a novel, very simple, low-cost and high accurate absolute rotary angular/ position sensor is presented. The sensor operation is based on the combination of circular gradient gray scale and gray code pattern. A simple experiment is done in order to demonstrate proof of concept of proposed sensor. The experimental results show that the proposed absolute rotary angular/position sensor has excellent linear characteristics with accuracy below ±1° and resolution of 0.1° within the full measurement range from 0° to 360°. The proposed idea and experimental results can be helpful to design absolute rotary angular/position sensor to improve performance of it.

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Section: Introductionmentioning

confidence: 99%

Novel Absolute Rotary Position Sensor Based on Combination of Gray Scale Pattern Disc

Choe

et al. 2021

Preprint

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“…Increasing the number of (optical) sensing elements in such applications, naturally leads to camera-based solutions. In Reference [ 10 ], the authors present the approach that closely resembles idea from Reference [ 9 ], but with the use of a CCD sensor. As a slight modification, the authors of Reference [ 11 ] present the absolute rotary encoder that uses a CMOS sensor and barcode-like features radially arranged on a disk.…”

Section: Introductionmentioning

confidence: 99%

Fast and Reliable Alternative to Encoder-Based Measurements of Multiple 2-DOF Rotary-Linear Transformable Objects Using a Network of Image Sensors with Application to Table Football

Bošnak

Klančar

2020

Sensors

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Simultaneous determination of linear and angular positions of rotating objects is a challenging task for traditional sensor applications and a very limited set of solutions is available. The paper presents a novel approach of replacing a set of traditional linear and rotational sensors by a small set of image sensors. While the camera’s angle of view can be a limiting factor in the tracking of multiple objects, the presented approach allows for a network of image sensors to extend the covered area. Furthermore, rich image data allows for the application of different data processing algorithms to effectively and accurately determine the object’s position. The proposed solution thus provides a set of smart visual encoders emulated by an image sensor or a network of image sensors for more demanding spatially distributed tasks. As a proof of concept, we present the results of the experiment in the target application, where a 1.6 MP image sensor was used to obtain sub-degree angular resolution at 600 rpm and thus exceeding the design parameters and requirements. The solution allows for a compact, cost-effective, and robust integration into the final product.

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“…The encoders are classified as optical, magnetic, inductive, and capacitive according to their measurement principle. Optical and magnetic encoders are dominant in the market as they can achieve high precision, but they tend to be relatively expensive and bulky [2,6,7,8,9,10]. Currently, capacitive encoders have been gaining interest owing to their simplified design, potential for further miniaturization, insensitivity to magnetic field variation, long lifespan, low cost, and high measurement accuracy [5,10,11,12].…”

Section: Introductionmentioning

confidence: 99%

Periodic Nonlinear Error Analysis and Compensation of a Single-Excited Petal-Shaped Capacitive Encoder to Achieve High-Accuracy Measurement

Hou

Zhou

et al. 2019

Sensors

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The measurement results of a single-excitation petal-shaped capacitive encoder show strong periodic characteristics for nonlinear errors. This paper presents the analysis of periodic nonlinear errors in a single-excitation petal-shaped encoder in terms of three main aspects—sensitive structure processing error, circuit demodulation error, and installation error. Analytical and simulation results confirm that the first-, second-, and fourth-periodic electrical errors are caused by the misalignment of circuit parameters, non-uniform segmentation of the processing error, and cross interference of the electric field, respectively. Further experimental investigation reveals that the mechanical periodic error is caused by installation misalignment. Based on these analytical, simulation, and experimental results, the design of the capacitive encoder was optimized and a method based on harmonic components was applied to compensate the periodic nonlinear error of the encoder. Measurement results shows that the prototype which has 180 petal-shaped numbers can achieve a reduction of periodic nonlinear errors to less than 0.02° and its accuracy can be improved to 0.0006° after compensation over the full measurement range.

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A Novel Approach of an Absolute Encoder Coding Pattern

Cited by 47 publications

References 10 publications

Novel Absolute Rotary Position Sensor Based on Combination of Gray Scale Pattern Disc

Novel Absolute Rotary Position Sensor Based on Combination of Gray Scale Pattern Disc

Fast and Reliable Alternative to Encoder-Based Measurements of Multiple 2-DOF Rotary-Linear Transformable Objects Using a Network of Image Sensors with Application to Table Football

Periodic Nonlinear Error Analysis and Compensation of a Single-Excited Petal-Shaped Capacitive Encoder to Achieve High-Accuracy Measurement

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