Portable Visible Spectrometer Based On The Transmission Grating

In recent years,with the popularity of smart phones,it has gradually replaced notebook computers and become the new favourite of people.The smart phone can be used with the spectroscopic optical path to complete the spectrum image acquisition and analysis function,effectively utilizing the advantages of the smart phone for easy carrying,long battery life,high lens pixel resolution and powerful processor performance,in line with the trend of miniaturization of spectral instruments,and has a very broad development space and research value.This thesis analyzes and studies the principle,classification and structural composition of spectrometer,and proposes a portable visible light spectrometer with transmission grating as the dispersive element.The experimental results are presented.The paper mainly includes the following three parts:1.This paper briefly introduces the historical background of the spectrometer,and elaborates on the working principle and design scheme of different kinds of spectrometers.It demonstrates the feasibility of constructing the spectrum analysis system by combining the smartphone with the spectroscopic optical path,and affirms the research content and significance of this paper.2.Design a visible spectrometer based on the transmission grating.The whole size of the spectrometer optical system is 44*44*50mm~3 and the working spectrum ranges from 380 nm to 780 nm with the theoretical resolution of 2 nm.It only needs to fix the optical system to the smartphone,the smartphone uses its CPU for data processing,finally generates the spectral curve of the visible light source.3.In order to verify the measurement performance of the visible light spectrometer,three pigment solutions were prepared to prove the correctness of the design.In this section,we use carmine,apple green and sunset yellow,then used the visible light spectrometer and the commercial spectrometer to measure the absorption spectrum of the pigment solution respectively,and compared the absorption spectrum curve to complete the verification of the experiment,and the actual measurement resolution is2nm.The transmission grating visible light spectrometer studied in this paper has distinct characteristics of the times,small size,simple structure,convenient operation and broad application prospects.