本文關(guān)鍵詞：不同紫外波段激發(fā)生物氣溶膠熒光雷達(dá)系統(tǒng)性能分析　出處：《光子學(xué)報(bào)》2017年12期 　論文類型：期刊論文

  更多相關(guān)文章： 熒光雷達(dá) 信噪比 激光誘導(dǎo)熒光 生物氣溶膠 臭氧 太陽(yáng)背景光 數(shù)值仿真

【摘要】：基于激光誘導(dǎo)生物熒光技術(shù),分別采用紫外355nm和266nm激光作為激發(fā)光源,構(gòu)建生物氣溶膠熒光雷達(dá)監(jiān)測(cè)系統(tǒng)模型.綜合考慮不同激發(fā)波段,臭氧吸收以及太陽(yáng)背景光等因素對(duì)激光雷達(dá)熒光探測(cè)效果的影響,對(duì)系統(tǒng)性能進(jìn)行數(shù)值仿真分析.仿真結(jié)果表明,在四倍頻266nm紫外波段的激光激發(fā)下,系統(tǒng)受地表臭氧的影響,白天的有效探測(cè)距離非常有限;在系統(tǒng)信噪比為10(SNR=10),臭氧濃度為50μg/L時(shí),最大探測(cè)距離僅為300m;而夜間情況下,太陽(yáng)背景光影響減弱,探測(cè)距離約為450m.三倍頻355nm激發(fā)時(shí),臭氧對(duì)系統(tǒng)的探測(cè)性能影響較小,夜間探測(cè)距離可達(dá)750m;白天太陽(yáng)背景光對(duì)355nm的系統(tǒng)影響較大,在相同0.5mrad接收視場(chǎng)角下,其有效探測(cè)距離約為330m.為減少白天背景光的影響,將望遠(yuǎn)鏡接收視場(chǎng)角壓縮到0.3mrad,同時(shí)選用50nm帶寬的濾光片,此時(shí)系統(tǒng)的探測(cè)距離為480m.由于355nm波段的激發(fā)熒光受白天太陽(yáng)背景光的影響較大,在進(jìn)行夜間探測(cè)時(shí)才可獲得較好的效果;而266nm的激發(fā)波段可以很好的抑制背景光影響,能夠?qū)崿F(xiàn)對(duì)生物氣溶膠的白天有效探測(cè).
[Abstract]:Based on the technology of laser induced bioluminescence, ultraviolet 355nm and 266nm laser were used as excitation light source, respectively, and the model of biological aerosol fluorescence radar monitoring system was constructed. Different excitation bands were considered synthetically. The effects of ozone absorption and solar background light on the fluorescence detection efficiency of lidar are analyzed numerically. The simulation results show that the system is excited by the fourth harmonic wavelength of 266 nm UV. The system is affected by surface ozone, and the effective detection range is very limited during the day. When the SNR of the system is 10 渭 g / L and the ozone concentration is 50 渭 g / L, the maximum detection range is only 300 m. At night, the influence of solar background light is weakened, and the detection range is about 450 m.The ozone has little effect on the detection performance of the system when the frequency of triple frequency is 355nm, and the detection range can reach 750m at night. The solar background light has a great influence on the system at 355nm during the day. At the same angle of view, the effective detection range is about 330mm. in order to reduce the influence of the background light during the day. The angle of view received by the telescope was compressed to 0.3 mrad.The filter with a bandwidth of 50 nm was also selected. The detection range of the system is 480 m. Because the excitation fluorescence in 355nm band is greatly influenced by the background light of the sun during the day, the better results can be obtained when the system is detected at night. The 266nm excitation band can suppress the background light and can effectively detect biological aerosols during the day.
【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(guó)家自然科學(xué)基金(Nos.41405028,61675167)資助~~
【分類號(hào)】：TN958
【正文快照】： 0　引言穩(wěn)定懸浮在空氣中的固相或液相粒子(0.01~100μm之間)組成的分散相被稱為氣溶膠[1].大部分氣溶膠顆粒屬于可吸入顆粒物(10μm),可以通過肺泡進(jìn)入人體并極易引發(fā)各種疾病[2].具有生物活性的氣溶膠被稱為生物氣溶膠.生物氣溶膠種類可以細(xì)分為:細(xì)菌、真菌、病毒、毒素、，

本文編號(hào)：1412721