Research On Spatial Modulation Optimization Method Based On Optical Field Type Time-grating Intensity Distribution

With the rapidly development of intelligent manufacturing,measuring level of science and technology embodies a concentrated reflection of the level of a national science and technology development.Modern precision displacement measurement technology is more and more important in the industrial production.Optical displacement measurement in precision displacement measurement technology accounted for a large proportion,common high-precision optical measurement are grating displacement sensor and laser interferometer.The research group of the author carried out the research of light field time gating,due to the problems of high processing difficulty and high manufacturing cost of the high-precision grating displacement sensor and the demanding environment of the expensive laser interferometer.The light field time-grating displacement sensor developed in the early stage using the light intensity to carry out the time and space modulation to measure the displacement,in fact the spatial modulation accuracy is not high,so this paper studied the spatial modulation optimization method of the light intensity distribution,and mainly carried out the following research work from the single-light field time-grating:(1)According to the characteristics of lambert-type light source,the characteristics of the distribution of light intensity in the system are analyzed,and the influence of different light sources on the measurement is analyzed in combination with simulation.The appropriate light source was selected for the measurement system,in addition,the errors in the measurement system were analyzed,including the errors caused by the uneven distribution of the light source and the errors caused by the installation deviation of the sensor in the installation process.(2)According to the intensity distribution characteristics,the use intensity grid method and the law of conservation of energy could be divided into chin distribution and intensity distribution symmetry distribution.The error analysis results on the surface of the sensor system using the grid configuration form and grid optimization design aspects of type,and the arrangement forms and reflector surface structure analysis and simulation verification,to achieve optimum spatial modulation system.(3)The experimental platform of light field time-grating sensor was built,and the hardware circuit needed for the experiment was designed.Has completed the optimized configuration and surface structure of the reflector test experiment,confirmed the experimental effect is good form reflector,the measurement error and stability test,according to the harmonic frequency analysis of measurement error correction,the results show that in the measurement of 500 mm within the scope of using the lattice spacing of 0.1 mm measurement prototype,The measurement accuracy can reach ±0.2?m in the period,the whole range can realize the measuring accuracy of 5.4 ?m.To sum up,this paper directly realizes the optimization of signal space modulation by changing the grid surface arrangement mode and structure surface type of the sensor based on the error source of the measurement system by theoretical derivation of the light field time grating and in-deeply analysis of light intensity distribution.The feasibility of the optimization design of the light field time-grating was verified,and the high precision measurement was realized,which lays a solid foundation for the light field time-grating displacement sensor with higher performance in the future.