雙波長熒光雷達(dá)探測大氣生物氣溶膠的性能分析
發(fā)布時(shí)間：2018-11-06 17:10
【摘要】：生物氣溶膠在大氣中擴(kuò)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(shí)現(xiàn)生物氣溶膠實(shí)時(shí)、遠(yuǎn)距離的探測顯得尤為重要。構(gòu)建了一臺雙波長熒光雷達(dá)用于大氣中生物氣溶膠的預(yù)警和識別。該雷達(dá)系統(tǒng)采用Nd∶YAG固體激光器作為激勵(lì)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(dá)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(jìn)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(shí),單激光脈沖測量得到白天和夜晚細(xì)菌孢子的最小探測濃度分別為15 100個(gè)顆�！~(-1)和8 386個(gè)顆粒·L~(-1);當(dāng)脈沖數(shù)累加到10 000時(shí),白天和夜晚的細(xì)菌孢子最小探測濃度顯著改善,分別為144個(gè)顆�！~(-1)和77個(gè)顆粒·L~(-1)。分析結(jié)果還表明,通過紅外波段確定細(xì)菌孢子云團(tuán)位置后,為了提高系統(tǒng)對細(xì)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(shí)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(jī)械與精密儀器工程學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)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(jī)械與精密儀器工程學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(61675167,41405028,41627807)資助
【分類號】：O657.3;R122.1
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，本文編號：2314921
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