Debugging And Application Of Data Acquisition System For Space Radiation Detector

Space radiation environment is a key factor that endangers on-orbit spacecraft,and even threatens the lives of astronauts.Data acquisition and transmission is a part of the space radiation detection system.Building the data acquisition system will greatly improve the development of space technology.Firstly,aiming at the research target of space particle radiation detection,a data acquisition system of space particle radiation detector is built,which can detect many kinds of space particles.The system consists of hardware and software.By expanding data transmission channels,data acquisition and transmission of various modes are realized.On the basis of basic working modes,data acquisition modes of sampling server,main and auxiliary,parallel,Desktop-optical fiber and Desktop-USB are extended.The data acquisition system is debugged and tested in software and hardware.Aiming at the interruption of data acquisition and the inability to acquire particle waveforms during the testing process,the baseline and trigger threshold adjustment methods are used to solve these problems.Secondly,the completed data acquisition system is applied to n/gamma discrimination test.Using plastic scintillator as detector and pulse shape analysis,a two-dimensional PSD image is drawn.Two bands of n/gamma can be clearly distinguished on the two-dimensional image.After PSD projection,the N and gamma peaks can be fitted by Gauss fitting,and the peak spacing and the half-height width of the two peaks can be obtained.The identification of n/gamma can be realized.The quality factor can reach 1.016.Furthermore,the data acquisition system is applied to validate the method of ground simulation pulsar navigation and positioning.Four radiation sources and a single detector are used to simulate the ground model of pulsar navigation and positioning.A set of simultaneous equations is established to locate the three-dimensional target of the detector by calculating the distance between the four radiation sources and the detector.The error of target location results is analyzed.Aiming at the problem that the main source of location error is the statistical error of particle detection,some improvement measures are put forward,such as increasing the receiving area of detector and prolonging the testing time,which can reduce the statistical error of particle detection and improve the positioning accuracy.Finally,the basic working mode of the data acquisition system is used for experimental testing.The detection efficiency of scintillator has a great influence on positioning error.Using MCNP to simulate and calculate the detection efficiency of particle incident on cuboid detector from different angles.By comparing the experimental results with the simulation results,it is concluded that the detection efficiency of scintillator detector is the highest when the incident angle of particle is 20 to 30 degrees.