The Application of FPGA-Based High Precision Photoeletric Encoder System in Digital Planimeter
A high precision planimeter is introduced in the paper. It can measure all kinds of graph area in high-precision. It includes three parts: FPGA, photo encoder and peripherals. The FPGA is the control center, and the peripherals are used to display, print and input etc. Two photoelectric encoders are installed in the rolling wheel and the end of tracing arm respectively. When they rotated, two square wave signals A and B will be outputted, whose phase difference is 90° . It presents the rolling direction, clockwise or anticlockwise. Also, the output signal will be exchanged into the samples accordingly. Then the area or the length of the graph or the curve will be calculated by the FPGA. In addition, to increase the detection precision, the FPGA-base four subdivision circuits is introduced into the planimeter. The fourfold-frequency of the pulse counting part is achieved by the signal processing parts of FPGA. Because it can increase the photoelectric encoder detection precision, the orientation precision of each samples coordinate is increased correspondingly. Finally, the test data shows that the FPGA based planimeter not only has high detection precision which does not be affected by the type of graph to be measured, but also is easy to use and bring.
FPGA photoelectrlc encoder planimeter high precision detection
Li Wanchen Cang Yan Cao Yanli
Information and Communication College, Haerbin Engineering University, HEU Haerbin, China
国际会议
成都
英文
1181-1183
2010-12-17（万方平台首次上网日期，不代表论文的发表时间）