Design Of Control System And Peak Shape Evaluation Method For Roller Mill And X-ray Diffraction Goniometer

In the field of single crystal material processing,the grinding and orientation of the ingot are two key processing steps.At present,the roller mill used for crystal bar grinding and the X-ray orientation device for crystal bar orientation are separated,resulting in boring process,low production efficiency and low orientation accuracy.In addition,the same single crystal has a plurality of crystal faces with the same physical characteristics,and the single crystal is affected by the growth environment,and the degree of expression of the same physical characteristics of these crystal faces is quite different.Currently,the crystal orientation devices on the market,are randomly looking for a meet the conditions of the crystal surface,resulting in the production of the chip quality is not satisfactory.In this paper,the control system based on the STM32F405 platform and the roller mill control system based on the FPGA platform are designed.Through RS232 communication,the roller mill and the orientation instrument are integrated.In this paper,the method of diffraction peak shape evaluation is studied,and the diffraction peak preprocessing method based on wavelet transform and the method of peak diffraction peak shape evaluation based on depth belief network are designed.The main contents of this paper are as follows:(1)The hardware design of the system,the hardware of the directing instrument control system includes the design of micro controller circuit,communication interface circuit,signal amplifying circuit and power supply circuit.The hardware of the roller mill control system includes FPGA circuit,motor phase current and speed detection circuit,Communication circuit and motor drive circuit design.(2)The design of the system software,the software design of the control system of the orientation mill includes the system initialization,the system self-test,the crystal orientation method,the human-computer interaction and the design of the communication protocol.The software design of the roller mill control system includes UART communication module and Vector control method of the permanent magnet synchronous servo motor controller,testing agencies,the implementation of the FPGA implementation.(3)Study on diffraction peak-peak shape evaluation method,including the pre-processing of diffraction peak signal based on wavelet transform and the diffraction peak-peak shape evaluation method based on depth belief network.The Mallat algorithm of wavelet transform is used to decompose the diffraction peak signal in multi-scale.Then,the soft filter is used to filter and smooth the curve.The Mallat algorithm is also used to deduct the background of the diffraction peaks.The depth belief network is constructed,and the samples are used to train the network to realize the classification of diffraction peaks and peaks shapes,and then the diffraction peaks and peaks are evaluated.In this paper,the hardware and software design of the roller direction finder is finished,and the diffraction peak-peak shape preprocessing method based on wavelet transform and the diffraction peak-peak shape evaluation method based on depth belief network are designed.