Study Of The Signal Processing System Of The Active Optical Micro Displacement Sensor Based On Floating Point DSP

The active optical technology refers to a technique for self-repairing the deformation and offset of spliced telescopes,and the measurement of small displacements between telescope submirrors is the key technology of active optical systems.In this thesis,a signal processing system is developed for a new capacitive micro-displacement sensor applied to an active optical system,so as to realize real-time precision measurement of small displacements.In this thesis I designed a micro-displacement sensor signal processing system based on floating-point DSPTMS320F28335.I designed this system based on the development status of active optical micro-displacement sensors and digital signal processing technology.The main research work is divided into two parts: the first part is Signal sampling and DSP signal processing circuit hardware design,it includes: 24-bit high-precision AD conversion chip and peripheral circuits,floating-point DSP and its peripheral circuits,memory module and its peripheral circuits,power-on and manual reset control circuit,RS232 serial port output Level conversion circuit,power supply and its filter circuit.The second part is the software design of signal acquisition and processing,which includes: the configuration of AD conversion chip ADS1256;the realization of DSP signal processing algorithm and the control program for other modules;the control program based on LCD display screen.Finally,the hardware and software of the system are debugged,which proves that the system can run normally.The actual micro-displacement measurement experiment shows that the system can achieve the predetermined signal acquisition and processing functions.