Research On Spectral Spectroscopy Element Of High Energy Particle Radiation Measuremen System

With the development of the aerospace industry,researchers have gradually begun to pay attention to the characteristics of high-energy particles in space.Various high-energy particle detectors have been developed to measure different characteristics of high-energy particles.The high-energy particle radiation measurement system studied in this paper is based on the cherenkov radiation effect principle and the ultraviolet detection technology.The spectral element is the key element in the measurement system of high-energy particle radiation.In order to meet the requirements of the high-energy particle radiation measurement system,a spectral element is studied in this paper.The front surface of the component is coated with an ultraviolet filter membrane,which makes the cherenkov ultraviolet band reflect highly,and the light of other bands in the system reflect less.For the system,the light transmitted on the front surface is stray light,which will affect the measurement accuracy of the system.Therefore,the absorption film is plated on the rear surface of the element to reduce the impact of stray light on the system and improve the signal-to-noise ratio.Hf O2 was selected as the material with high refractive index by contrast experiment.The optical constants of dielectric materials were determined by full spectrum fitting method and the optical constants of Cr were calculated by elliptic polarization method.Based on the design and optimization theory of optical thin film,the membrane system design of filter film and absorption film was completed on JGS1 substrate.The technological parameters of film preparation were determined by experiments.Through the test and analysis of the experimental results of the filter film,the reason for the deviation from the theoretical design was found,and the preparation process of the film was further optimized.The average reflectivity of the filter film was 75.9% in the 200-270 nm band,1.42% in the 290-780 nm band,and 96.6% in the 290-780 nm band,which met the requirements of the system.