Simultaneous Multipolarization And High-resolution Oxygen A-band Spectrometer Design And Analysis

Using the remarkable near-infrared characteristics of oxygen A-band spectrum,combined with polarization measurement,atmospheric aerosol can be well detected.Therefore,the research and development of related detection instruments is also in progress.Based on the two detection methods of polarization detection principle,a method of simultaneous polarization measurement is proposed in this paper,which provides different ideas for the research and development of aerosol detection instruments.In terms of design and modeling,based on the astigmatism correction theory and Czerny-Turner structure,the idea of adding multiple incident light sources in front of the incident slit of the spectrometer was proposed.A cylindrical mirror was added in front of the image to correct the astigmatism,and then the optical design modeling was verified.Convolution is used to evaluate the resolution of optical path modeling.The results of the optical path design show that the optical path can detect four spectral information simultaneously.Based on the theory of optical design,the structure of the spectrometer system was designed by using 3D modeling software,the modeling of the main key components of the spectrometer system was given,and the clamping scheme and adjusting mechanism of the optical lens of the spectrometer system were designed.In the aspect of the physical construction of the spectrometer system,the installation method and process of the system are described in detail,and the prototype of the spectrometer was preliminarily built.A halogen tungsten lamp and a mercury-argon lamp were used as the incident light sources of the spectrometer system.The debugging results show that the spectrophotometric performance of the preliminarily constructed spectrometer system meets the requirements.And the resolution is 0.03nm;When 14 light sources incident at the same time in front of the slit,14 pieces of spectral information can be detected simultaneously on the image plane,and the idea of simultaneous detection is verified.Finally,the whole system was tested outdoors,and the test results showed that light and dark stripes could be obtained on the image surface in the band of 690nm-810nm.