雙波長熒光雷達探測大氣生物氣溶膠的性能分析
發(fā)布時間：2018-11-06 17:10
【摘要】：生物氣溶膠在大氣中擴散極易傳播和發(fā)生各種流行疾病,也是生物武器投放的主要形式,實現(xiàn)生物氣溶膠實時、遠距離的探測顯得尤為重要。構(gòu)建了一臺雙波長熒光雷達用于大氣中生物氣溶膠的預(yù)警和識別。該雷達系統(tǒng)采用Nd∶YAG固體激光器作為激勵光源,基頻1 064nm、四倍頻266nm作為工作波長�；诩す庹T導(dǎo)熒光雷達探測原理,對紅外波段的彈性散射信號和紫外波段誘導(dǎo)的熒光信號進行數(shù)值分析。結(jié)果顯示,在探測誤差小于10%的情況下,距離為1.0km時,單激光脈沖測量得到白天和夜晚細菌孢子的最小探測濃度分別為15 100個顆�！~(-1)和8 386個顆粒·L~(-1);當(dāng)脈沖數(shù)累加到10 000時,白天和夜晚的細菌孢子最小探測濃度顯著改善,分別為144個顆�！~(-1)和77個顆粒·L~(-1)。分析結(jié)果還表明,通過紅外波段確定細菌孢子云團位置后,為了提高系統(tǒng)對細菌孢子的探測性能,可增加紫外激光脈沖數(shù)量,延長熒光信號采集時間。
[Abstract]:Biological aerosol diffusion in the atmosphere is easy to spread and occur a variety of epidemic diseases, is also the main form of biological weapons, the realization of biological aerosol real-time, long-range detection is particularly important. A dual wavelength fluorescent radar was constructed for early warning and identification of biological aerosols in the atmosphere. The radar system uses Nd:YAG solid-state laser as exciting light source, fundamental frequency 1064nm and quadruple frequency 266nm as working wavelength. Based on the principle of lidar detection, the elastic scattering signal in infrared band and fluorescence signal induced in ultraviolet band are numerically analyzed. The results show that when the detection error is less than 10% and the range is 1.0km, The minimum detectable concentrations of bacterial spores in day and night were 15 100 L ~ (-1) and 8 386 L ~ (-1), respectively. When the number of pulses accumulated to 10 000, the minimum detection concentration of bacterial spores was significantly improved at day and night, with 144 particles L ~ (-1) and 77 particles L ~ (-1), respectively. The results also show that the number of ultraviolet laser pulses and the time of fluorescence signal acquisition can be increased in order to improve the detection performance of bacterial spores by determining the location of bacterial spores in infrared band.
【作者單位】： 西安理工大學(xué)機械與精密儀器工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(61675167,41405028,41627807)資助
【分類號】：O657.3;R122.1
本文編號：2314921
[Abstract]:Biological aerosol diffusion in the atmosphere is easy to spread and occur a variety of epidemic diseases, is also the main form of biological weapons, the realization of biological aerosol real-time, long-range detection is particularly important. A dual wavelength fluorescent radar was constructed for early warning and identification of biological aerosols in the atmosphere. The radar system uses Nd:YAG solid-state laser as exciting light source, fundamental frequency 1064nm and quadruple frequency 266nm as working wavelength. Based on the principle of lidar detection, the elastic scattering signal in infrared band and fluorescence signal induced in ultraviolet band are numerically analyzed. The results show that when the detection error is less than 10% and the range is 1.0km, The minimum detectable concentrations of bacterial spores in day and night were 15 100 L ~ (-1) and 8 386 L ~ (-1), respectively. When the number of pulses accumulated to 10 000, the minimum detection concentration of bacterial spores was significantly improved at day and night, with 144 particles L ~ (-1) and 77 particles L ~ (-1), respectively. The results also show that the number of ultraviolet laser pulses and the time of fluorescence signal acquisition can be increased in order to improve the detection performance of bacterial spores by determining the location of bacterial spores in infrared band.
【作者單位】： 西安理工大學(xué)機械與精密儀器工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(61675167,41405028,41627807)資助
【分類號】：O657.3;R122.1
【相似文獻】
相關(guān)期刊論文 前1條
1 蔡舒窈;張佩;朱玲琳;謝承科;孫征宇;程偉林;趙永凱;黃惠杰;;基于色氨酸本征熒光測量的生物氣溶膠檢測技術(shù)研究[J];光學(xué)學(xué)報;2012年05期
，本文編號：2314921
本文鏈接：http://www.sikaile.net/yixuelunwen/yufangyixuelunwen/2314921.html
最近更新
教材專著
