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大气污染物NO_2分子的光声探测 被引量:1

Detection of NO_2 molecule with photoacoustic technique
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摘要 NO2是大气污染物的主要成分之一,该污染物在430~450nm波长范围内有很强的吸收,用在400-450 nm波长范围内具有较强荧光发射的常用脉冲闪光灯作激发光源,采用光声技术,用自行设计制作的一套光声探测装置,对常温条件下NO2分子在430~450nm波长区间的光声特性进行了实验研究。实验结果表明,当缓冲气体压强较低时,光声信号强度随缓冲气体压强升高而增大,气压增加到约3.0×104Pa时出现饱和现象。信号强度随NO2气体浓度的增加而增大。以普通的脉冲闪光灯为激发光源,采用高灵敏度的光声技术,在标准大气压情况下,NO2气体探测灵敏度可以达到6.4×10-6。 The pulse flash light with 400-450 nm wavelength is used as the incentive light resource. The photo-acoustic (PA) technique is used to survey the photoacoustic characteristics of NO2 molecule with 430~450 nm wavelength under room temperature. A set of photoacoustic detecting equipment is designed. The experimental results show that the intensity of the PA signal varies with the buffering gas pressure. The intensity of the PA signal increases with increasing the concentration of NO2. The detection sensitivity can reach 6.4×10-6 under standard atmospheric pressure.
出处 《华北电力大学学报(自然科学版)》 CAS 北大核心 2005年第4期97-100,共4页 Journal of North China Electric Power University:Natural Science Edition
基金 河北省自然科学基金资助项目(102090)华北电力大学青年科研基金资助项目(09320028).
关键词 光声技术 闪光灯 NO2分子 探测灵敏度 photoacoustic technique flash light NO2 molecule detection sensitivity
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参考文献10

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