Improving the interpolation accuracy of optical encoders via noise suppression and signal correction

Zhao, Guobo; Ban, Yaowen; Zhang, Zhenghui; Shi, Yongsheng; Chen, Bangdao; Liu, Hongzhong

doi:10.1016/j.sna.2024.115122

Cited by 5 publications

(2 citation statements)

References 22 publications

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“…The digital coding method generally arranges multiple sets of light sources and photosensitive elements on the circumference, obtains binary signals through photoelectric conversion, and obtains encoder angular position information through specific digital decoding circuits. The digital coding method mainly includes reflective Gray code, matrix code, m-sequence code, and single-ring Gray code [8][9][10][11]. The image encoding method uses an image to replace the encoder, and the imaging system projects specific images onto the CCD camera, utilizing its high-resolution characteristics; the angle and position measurements are achieved through software post-processing algorithms [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the n-bit m-sequence encoding method generally requires 2n light sources and photosensitive elements. The n photosensitive probes on each code track are tightly arranged, which not only increases production costs but also is not conducive to product miniaturization [11,18,19]. The rapid development of non-coding measurement methods based on image recognition subverts traditional position coding in terms of measurement mechanisms.…”

Section: Introductionmentioning

confidence: 99%

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Absolute Photoelectric Encoder Based on Position-Sensitive Detector Sensor

Geng,

Cao,

Shang

et al. 2024

Electronics

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In response to the engineering, miniaturization, and high measurement accuracy requirements of encoders, this paper proposes a new type of absolute photoelectric encoder based on a position-sensitive detector (PSD). It breaks the traditional encoder’s code track design and adopts a continuous and transparent code track design, which has the advantages of small volume, high angle measurement accuracy, and easy engineering. The research content of this article mainly includes the design of a new code disk, decoding circuit, linear light source, and calibration method. The experimental results show that the encoder designed in this article has achieved miniaturization, simple installation and adjustment, and easy engineering. The volume of the encoder is Φ50 mm × 30 mm; after calibration, the resolution is better than 18 bits, and the accuracy reaches 5.4″, which further demonstrates the feasibility of the encoder’s encoding and decoding scheme.

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