Shenyang Institute of Automation, Chinese Academy of Sciences has developed a high sensitivity mid-infrared detection system

2022-04-26 0 By

On January 25th, the reporter learned from the shenyang institute of automation, Chinese Academy of Sciences, that of the terahertz team is the key technology breakthrough in the field of infrared detection, realized based on selenium gallium barium crystal infrared high sensitive detection in 3 ~ 8 microns, the nanosecond pulse detection sensitivity index reached the international advanced level, and achieve the localization of the system.The technology will provide a powerful detection tool for cutting-edge scientific research in biological, medical and chemical fields in China. The relevant results were published in the latest issue of optics, an authoritative international journal of optics.Mid infrared detection system based on laser frequency conversion technology.According to the introduction, compared with the traditional visible near infrared band, the resonance phenomenon between middle infrared light and molecules can greatly improve the signal-to-noise ratio of spectral measurement, and then realize the effective identification of material composition.Mid-infrared detection technology plays an important role in promoting scientific exploration in life science, physical property analysis and other fields, as well as promoting the development of environmental protection, chemical industry, medical diagnosis and other industries.The current mid-infrared detection mainly adopts thermal detection and photoelectric detection as two direct detection methods. The existing performance can hardly meet the demand of scientists for accurate detection of trace substances, and the detection sensitivity has become a bottleneck problem in the research of mid-infrared system.Qi Feng, leader of the terahertz team of shenyang Institute of Automation, Chinese Academy of Sciences, said, “In view of the current bottleneck problem of mid-infrared detection, we proposed a solution based on laser frequency conversion technology, designed and built an experimental system.Its working principle is to efficiently convert the weak mid-infrared signal to the near-infrared signal, which carries the information of the mid-infrared light and is easy to detect, through this indirect detection method to greatly improve the detection sensitivity of the mid-infrared signal.”After in-depth analysis of the optical properties of various crystals, the research team focused on selenium-gallium-barium crystals.”Selenium gallium barium crystals are usually used as waves, bold attempt, we use it as a part of the detection system, in its optical properties on the basis of design for high performance optical parametric oscillator, optimized the phase matching conditions, solve the weak signal under the environment of strong background noise suppression, send and receive the one in infrared system.”QiFeng said.The experimental test of nanosecond pulse of Se-ga-barium crystal shows that the detection sensitivity of the system is 100 times better than that of the mercury Cadmium telluride detector, and the effective detection of nanosecond pulse of flying coke is realized.The dynamic range of the system is more than 110 dB, and the uniform response can reach 1.4 octaves in the wide frequency range, both of which are better than the traditional direct detection system.Shi Zelin, director of shenyang Institute of Automation and Key Laboratory of Opto-electronic Information Processing of the Chinese Academy of Sciences, said: “The laboratory always carries out photoelectric detection research for practical needs.It is the pursuit of our researchers to make breakthroughs on some very difficult problems by exploring new mechanisms and new methods.High-sensitivity infrared detection research is typical. If sensitivity can be increased by an order of magnitude, it will lead to new research methods in biology, medicine, chemicals and other fields, making the impossible possible.”Shen News all media reporter: Yue Yu