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The Design of Displacement Detection System Based on CPLD Grating Subdividing Technology

Author: FengPingPing
Tutor: CaoWei
School: Harbin University of Science and Technology
Course: Measuring Technology and Instruments
Keywords: grating subdividing displacement detection CPLD CAN bus
CLC: TP274
Type: Master's thesis
Year: 2013
Downloads: 1
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Abstract


With the advances in grating technology and electronic technology, the gratingmeasurement has been developing rapidly in the past two to three decades. As amajor measurement tool, it is difficult for the resolution of the grating ruler to havegreatly improved under the influence of the grating ruling technology and the volumeof the photoelectric conversion device. The design uses a subdivision technique toprocess the grating ruler for improving the resolution of the grating ruler andmeasurement sensitivity, saving the manufacturing cost of the grating measuringsystem and reducing the difficulty of system development.The design uses read-only memory segmentation method to identify the phaseaccurately and improve the multiple of subdivision for the grating ruler measurementsignal, and uses high-speed A/D converter and parallel memory to achieve fast andaccurate segmentation for the grating measurement signal and uses CPLD tocomplete logic timing control and data processing of the read-only subdivisionmodule. The control unit of the system uses MSP430to achieve the measurementresults’ display, storage and PC data transfer. Data transfer with the host computertasks can be completed by the CAN bus, and the measurement results can betransferred to host computer more high-speed, safely. the timing control ofsegmentation module and data processing is completed by VHDL language, and thedesign uses C language to complete the calculation of the segment data, control thecontrol module and transfer the measurement data.The design has the characteristics of high level of integration with the systemhardware, simple design of circuit, strong anti-interference and so on. The method ofthe design can reduce the difficulty of development, achieve accurate measurementof grating displacement with a more economical way and have good practical value,and be used widely in a variety of manufacturing and measurement occasions.

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