Raster-based Micro-displacement Detection Circuit System

The grating ruler is widely used in the modern precision measurement field, especially in the measurement of linearity field and angle field, which has played a very important role. Grating sensor is based on Mole strip, Limited by the scratching technology and volume of optical and electric switching equipments, the measuring precision is not have a large improvement. So using subdivides to get a precision measurement id a good choice.On the basis of many collection and analysis of reports and articles related to grating displacement detection equipment and FPGA-related, the FPGA and detection subdivides system of grating displacement based on FPGA are deeply discussed. Designed new style direction recognizing and subdivision and detected circuit based on FPGA, and achieved eight times frequency detection. And achieved application-specific integrated circuit chip of grating signal detection.