Optical Emission Spectrometer --history of development at home and abroad Spectroscopy originated in the 17th century. In 1666, physicist Newton conducted the first light dispersion experiment. He introduced a beam of sunlight in the dark room and let it pass through the prism. On the self-screen behind the prism, he saw that the seven colors of red, orange, yellow, green, blue, indigo, and purple were scattered in different positions- A rainbow is formed. This phenomenon is called spectrum. This experiment is the origin of the spectrum, and it hasn't caught people's attention since Newton. After more than 100 years of development and research, Kirchhoff and Benson designed and manufactured a complete spectroscopic device in order to study the spectrum of metals in 1859. This device is the world's first practical spectroscopic instrument. The spectral lines of various metals in flames and sparks established the preliminary basis of spectral analysis. Until 1882, Roland invented the concave grating, that is, the scratch was directly carved on the concave spherical surface. The concave grating is actually an integrated high-efficiency component of the imaging system components of the optical instrument, which solves the insurmountable difficulties encountered by the prism spectrometer at that time. The advent of the concave grating not only simplified the structure of the spectrometer, but also improved its performance. After 1928, as the spectroscopic analysis became the industrial analysis method, the spectroscopic instrument has been rapidly developed. On the one hand, the stability of the excitation light source has been improved, and on the other hand, the performance of the spectroscopic instrument has been improved. The earliest light source was flame excitation spectrum; later, simple arcs and electric sparks were developed as excitation light sources. In the 1930s and 1940s, controlled arcs and electric sparks were used as excitation light sources, which improved the stability of spectral analysis. Sex. In the morning of industrial production, the advancement of spectroscopy has promoted the further improvement of optical instruments, while the latter has affected the former, which has promoted the development of spectroscopy and the development of industrial production. In the 1960s, the photoelectric direct-reading spectrometer began to develop rapidly with the development of computer technology. Due to the development of computer technology, the development of electronic technology, the miniaturization of electronic computers, the emergence and popularization of microprocessors, and cost reductions, in the 1970s, the spectral instruments were almost 100% computer-controlled, which not only improved the analysis accuracy and speed are achieved, and the data processing and analysis process of the analysis results are automatically controlled. After the liberation, China's spectrum instrument industry has developed from scratch, from small to large, and has achieved rapid development. It has a certain scale, survives with the world's advanced technology competition, and develops in the social commodity competition. Trial production of spectroscopic instruments began in 1958, and China's first medium-sized quartz spectrograph, large spectrograph, and monochromator were produced. The Institute of Optomechanics of the Chinese Academy of Sciences began to study engraved gratings. In 59 years, Shanghai Optical Instrument Factory and Beijing Optical Instrument Factory began to study engraved gratings. From 1966 to 1968, Beijing Optical Instrument Factory and Shanghai Optical Instrument Factory successively developed medium-sized plane grating spectrographs, one-meter plane grating spectrographs, and photoelectric direct-reading heads. The first domestic WZG-200 plane grating light meter was successfully researched by Beijing No. 2 Optical Instrument Factory from 1971 to 1972, ending the history of China's failure to produce photoelectric Optical Emission Spectrometer.