Spectrum Of CMOS Based On FPGA Acquisition System

Spectral analysis is a technology that uses optics,electronics and computer science to identify material and determine its chemical composition and relative content.It is widely used in various fields,such as military,scientific research,field testing,food safety and so on.As an instrument spectrometer for spectral analysis,traditional spectral instruments,because of their complex structure,are expensive and huge,and are difficult to be widely used in practical engineering and in people's lives.Because of the advantages of small size and fast response,the micro,integrated and low cost spectrometer can realize real-time detection,which has a broad prospect of research.The Czerny-Turner optical path structure and the holographic flat field concave grating are analyzed,and the selected holographic concave grating and quartz fiber are introduced.The correction method of the holographic concave grating aberration is studied.The optical simulation software ZEMAX is used to optimize the holographic concave grating,the light source and the optical fiber,and the desired concave grating is obtained.Structural parameters are needed to verify the correctness and feasibility of the design.Then holographic concave grating and light source optical fiber module are built.The structure of Czerny-Turner optical path and holographic flat field concave grating are analyzed,and the selected holographic concave grating and quartz fiber are introduced.The optical modeling and Simulation of holographic concave grating,light source and optical fiber are carried out by using the optical simulation software ZEMAX.The correctness and feasibility of the design are verified,and then the holographic concave light is built.The gate and light source fiber module.On this basis,a hardware circuit of linear array CMOS spectral information acquisition system based on FPGA is designed.The system is divided into optical detection module,data transmission module and drive control module.The opticaldetection module uses the linear array digital pixel CMOS sensor as the photosensitive element to transform the optical signal into the digital signal,and the sensor itself realizes the related double sampling through the Verilog programming and internal configuration,and uses the serial port module to realize the high speed real-time transmission of the spectral data to the upper computer;the drive control module uses the FPG A is used as the core control element and the device is the core to control the process of optical signal acquisition,transmission and storage.In the design of the system,noise suppression and high-speed data transmission are fully considered.Finally,this thesis modularized each part of the design of the spectral information acquisition system,analyzed the results and the existing problems in the debugging of each module,and carried out the test of the performance test of the prototype wavelength calibration.Experiments show that the main performance parameters of the system reach the expected design goals.