Study of New interpolation Method on Moiré fringe
Ian Y, Ompany Lt · 2007
In the digital servo system,the common position sensor is the encoder. In the traditional position measurement system,the high-precision position measurement demand can be achieved by the interpolation to Moirefringe and emendation to the extractive and coarse signal. A new interpolation Method is proposed in the paper. The merit of DSP is fully used in the method,such as the fast operation speed,the strong data disposal ability,and etc. The method can obtain the higher precision position measurement result by the different counter value is calculated. And the smallest resolving power is decided by the operation speed of DSP. The method can avoid many error influences to the interpolation result,such as the scoring error to the extractive signal in machine,the emendation error to the extractive and coarse signal in electronics,and the A/D conversion error,and etc. The analysis indicate that the method is briefness,easy to operate,easy to amend. It is important that there are the higher utility value to advance the technology target of the encoder.