2013-06-012024-05-13https://scholars.lib.ntu.edu.tw/handle/123456789/653530Abstract: In this sub‐project, there will be three major tasks to be accomplished. The first major task is to develop the electronics sub‐system of optical encoders. For incremental optical encoders, the electronics includes the photo‐detector interfacing circuit along with pre‐amplifiers, the FPGA (field programmable gate array) based digital signal processing unit to provide sub‐division read‐outs, and the output interfacing circuit with standard ABZ encoder interface or serial communication protocols for high‐speed measurement and absolute type encoders. For absolute type optical encoders, learned from modern 2D barcodes and coding of data storage systems, a robust 2‐dimesaional coding mechanism with code correction and code detection mechanism will be developed and implanted with FPGA. The coding mechanism is supposed to solve the major problem of the code disks or linear scales to be polluted or scratched in real application environments. The second major task is to work with other sub‐projects for system integration and tuning and to achieve the goal of 17‐bit resolution incremental and mixed type rotary encoder and 1μm resolution linear encoder systems in the first year; 21‐bit resolution incremental and mixed type rotary encoder and 0.1μm resolution linear encoder system in the second year. The third task is to develop a testing and evaluation workstation with a laser encoder and an interferometer as the calibration and reference source for self‐built rotary and linear optical encoders. The workstation will also help to analyze the self‐build encoder systems and to develop the tolerance specifications on major components and the assembly processes.