| Autor: |
Jovanović Jelena, Denić Dragan, Jovanović Uglješa |
| Jazyk: |
angličtina |
| Rok vydání: |
2017 |
| Předmět: |
|
| Zdroj: |
Measurement Science Review, Vol 17, Iss 5, Pp 241-249 (2017) |
| Druh dokumentu: |
article |
| ISSN: |
1335-8871 |
| DOI: |
10.1515/msr-2017-0029 |
| Popis: |
Optical rotary encoders generate nonlinear sine and cosine signals in response to a change of angular position that is being measured. Due to the nonlinear shape of encoder output signals, encoder sensitivity to very small changes of angular position is low, causing a poor measurement accuracy level. To improve the optical encoder sensitivity and to increase its accuracy, an improved linearization circuit based on pseudo-linear signal generation and its further linearization with the two-stage piecewise linear analog-to-digital converter is presented in this paper. The proposed linearization circuit is composed of a mixed-signal circuit, which generates analog pseudo-linear signal and determines the first four bits of the final digital result, and the two-stage piecewise linear analog-to-digital converter, which performs simultaneous linearization and digitalization of the pseudo-linear signal. As a result, the maximal value of the absolute measurement error equals to 3.77168·10−5 [rad] (0.00216°) over the full measurement range of 2π [rad]. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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