Based on THz Spectroscopy Detection Method for the Concentration of 1,3-Dinitrobenzene Volatile Gas
ZHAO Hui1，2, WANG Gao1,2, MA Tie-hua1,2
1. Key Laboratory of Instrumentation Science &Dynamic Measurement (North University of China), Ministry of Education, Taiyuan 030051, China 2. National Key Laboratory of Science and Technology on Electronic Test and Measurement (North University of China), Taiyuan 030051, China
Abstract：For the unexpected situations occur that 1,3-dinitrobenzene volatile gas leaks in industrial production process, designed the differential characteristics absorption detection system for 1,3-dinitrobenzene volatile gas based on THz spectrum technique. The method can detect the concentration of trace 1,3-dinitrobenzene toxic gases through the THz characteristic wavelengths differential absorption method. System dealt with THz characteristics wavelengths of the two chambers, which provide difference dates, a group is standard air, and the other group tested the sample gas. Four main absorption bands of 1,3-dinitrobenzene is at 0.635, 0.912, 1.095 and 1.435 THz nearby in detection results, and according to the ratio of absorption coefficient in the corresponding absorption band it calculated the accurate amplitude from the corresponding wavelengths, at last the gas concentration was inversed. After the two traditional methods (chromatography and infrared absorption method) of experimental analysis and THz absorption detection method of the simulation study shows, precision of the detection capabilities of chromatography is high and error is small. But the chromatography separation time varies with the material, long cycle, slow; chromatography can not achieve real-time detection speed to realize real-time detection. Infrared absorption of environmental humidity is high, subject to drying. At the same time, THz absorption of environmental humidity is low; THz absorption method also has important characteristics of real time, strong anti-jamming, especially the water vapor, so it is more suitable for practical application.
Key words：THz spectroscopy;Toxic volatile gas detection;1;3-dinitrobenzene
赵 辉1，2，王 高1，2，马铁华1，2 . 基于THz光谱技术的1,3-二硝基苯挥发气体检测方法研究[J]. 光谱学与光谱分析, 2012, 32(04): 902-905.
ZHAO Hui1，2, WANG Gao1,2, MA Tie-hua1,2. Based on THz Spectroscopy Detection Method for the Concentration of 1,3-Dinitrobenzene Volatile Gas. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(04): 902-905.
