Code reading synchronization method for pseudorandom position encoders

Denić, Dragan; Miljković, Goran

doi:10.1016/j.sna.2009.01.015

Cited by 10 publications

(9 citation statements)

References 9 publications

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“…Although it is not possible to distinguish

positions with n sensors on a single track, it is possible to distinguish close to that many. This approach is similar to the one used in pseudorandom position encoder [ 8 ], where the pseudorandom sequence uniquely defines each step of the position data. Another approach uses multiple tracks and multiple sensors, presented in Reference [ 9 ], where the resolution of the position is still defined by the granularity of the coded pattern.…”

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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“…Although it is not possible to distinguish

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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“…The pseudorandom absolute position encoder code disc contains one synchronization and one pseudorandom code track. A synchronization track is needed to define the moment of the pseudorandom code reading, and also to determine the direction of rotation [12], [13]. Additionally, the synchronization track can be used for the angular velocity measurement [14] and for the encoder resolution increase.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, the synchronization track can be used for the angular velocity measurement [14] and for the encoder resolution increase. Code reading synchronization can also be achieved using internal synchronization method [12] or by additional coding of pseudorandom bits [13]. One or two code reading heads can be used for pseudorandom code scanning [6], [15], [16], as well as for parallel reading with photodetector array [17].…”

Section: Introductionmentioning

confidence: 99%

Redundant and Flexible Pseudorandom Optical Rotary Encoder

Miljković

Denić

2020

ELEKTRON ELEKTROTECH

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Optical encoders are mainly used in modern motion servo systems for high-resolution and reliable position and velocity feedback. Pseudorandom optical rotary encoders are single-track and use a serial pseudorandom binary code to measure absolute position. The realization and analysis of such a rotary encoder with advanced code scanning and error detection techniques, as well as an improved redundancy in operation, are presented. A presented serial code reading solution uses two phase-shifted code tracks and two optical encoder modules. So, the realized encoder, hybrid in nature, provides “output on demand” and more or less reliable position information using very efficient error checking. Compared to a standard absolute encoder, this encoder requires a smaller code disc, facilitates installation, has greater flexibility in operation, and is less sensitive to external influences.

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“…This code must be based on pseudorandom binary sequences [10] to solve the problems that arise when only one bit is available: code reading, code reading synchronization and code conversion [11]. The use of the two-dimensional image-array information provided by the CMOS camera of the optical mouse sensor can be used to avoid all these known problems when resolving the absolute angular position of the rotary encoder.…”

Section: Introductionmentioning

confidence: 99%