Recent Trends of Linear and Angular Pseudorandom Encoder Development

Denić, Dragan; Randelovic, I.; Miljković, Goran

doi:10.1109/speedam.2006.1649868

Cited by 10 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many improvements of the Gray code based pattern have been published in recent years [1]- [4]. There also exist absolute encoders based on De Bruijn [5] sequences or pseudorandom code patterns [6], [7], which consist of only a single track used to find the position. These kind of sensors require to have n heads facing in parallel to the track direction or use only one head and analyze the sequence with microprocessor unit.…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach of an Absolute Encoder Coding Pattern

Dziwiński

2015

IEEE Sensors J.

View full text Add to dashboard Cite

This paper presents a novel approach of an absolute rotary and linear optical encoder codding patterns. The concept is based on the analysis of 2-D images to find a unique sequence that allows to unambiguously determine an angular shaft position. The adopted coding method allows to achieve a very high data density for specified number of tracks on the code pattern disc. Encoders based on the proposed solution enable the production from readily available and inexpensive components. Nevertheless, encoders retain high measuring accuracy and high dependability obtained in the classical approach. The optical device and a design of processing system is proposed. Finally, the feasibility of the pattern coding method is further proved with encoder prototype.Index Terms-Absolute encoder, CCD sensor, Hamiltonian cycle, rotary encoder, 2D image. 1530-437X

show abstract

Section: Introductionmentioning

confidence: 99%

A Novel Approach of an Absolute Encoder Coding Pattern

Dziwiński

2015

IEEE Sensors J.

View full text Add to dashboard Cite

show abstract

“…In view of the characteristics of the GECS mentioned above, to overcome the low accuracy of coarse localization of a double-track PDGECS and to avoid large size or complicated structure of a PDGECS, a GECS, the operational principle of which is based on the phase of one track and the code of the other track, is described in this paper (hereinafter, this kind of sensor will be referred to as a combinatorial code grating eddy-current sensor (CCGECS)). The method with phase of one track as precise localization of the PDGECS is adopted by the CCGECS, but the coarse-localization method is improved by using single-track code to realize coarse localization as a replacement of phase difference among multiple tracks as coarse localization of the PDGECS [7][8][9]. The measurement principle of the CCGECS is introduced in section 2.…”

Section: Introductionmentioning

confidence: 99%

Analysis of technical requirements and the self-modification method for a combinatorial code grating eddy-current absolute-position sensor

Liu¹,

Zhao²,

Tao³

et al. 2012

Meas. Sci. Technol.

View full text Add to dashboard Cite

In order to overcome the shortcomings of the low coarse-localization accuracy of a phase difference grating eddy-current sensor (PDGECS), a combinatorial code grating eddy-current sensor (CCGECS) is presented in this paper. A single-track code localization method is adopted in a CCGECS to realize the coarse localization of a grating eddy-current sensor (GECS). This method is used as a replacement of the multi-track phase difference localization method in a PDGECS. The measurement principle of a CCGECS is introduced in this paper. The relationship between measurement accuracy and main characteristic parameters of sensor is obtained by mathematical deduction and error analysis, which offers theoretical foundation for design and technical requirements analysis of a sensor. A simple and practical self-modification method is also introduced in this paper. Experimental results show that adoption of a single-track code localization method to realize the coarse localization has greatly improved the coarse-localization accuracy of a GECS, resolved the contradiction between the coarse-localization accuracy and the measurement range caused by the multi-track phase difference localization method, realized the absolute-position measurement for a larger range and at the same time reduced the technical requirements, which lays a solid foundation for mass production of a CCGECS.

show abstract

“…Only pseudorandom position encoders can provide direct zero position adjustment without a significant change of hardware and software, and without permanent correction of measurement results, but only for cases of serial code conversion, [6]. In this Letter a new faster serial pseudorandom/natural code converter is proposed.…”

mentioning

confidence: 99%