基于光声光谱和腔衰荡光谱的气溶胶光学特性测量研究

发布时间：2018-03-13 13:47

本文选题：气溶胶吸收系数　切入点：气溶胶消光系数　出处：《光电子·激光》2017年02期 　论文类型：期刊论文

【摘要】：气溶胶光学特性是影响大气辐射强迫的重要因素,对全球气候起着决定性作用。针对当前气溶胶光学特性测量仪器存在的测量参数单一、测量不确定度高和溯源体系不完善等问题,本文将光声光谱(PAS)技术和光腔衰荡光谱(CRDS)技术相结合,实现了气溶胶的消光、吸收及散射系数同时在线测量,并研制了一套大气气溶胶多光学参数的高精度在线测量装置。本文测量装置经过NO2气体标准物质校准后,用于大气气溶胶光学特性测量,具有测量相对误差小于4%、测量重复性优于0.2%和测量不确定度为2.8%(k=2)等优点。与积分浊度计、黑碳仪现场实验数据比较,本文测量装置的消光系数、吸收系数和散射系数的En值均小于1,显示出良好的测量一致性和稳定性。实验结果表明,本文测量装置具备多参数测量能力,且测量结果准确可靠,可用于大气气溶胶光学特性的现场实时测量,也可用于相关测量仪器的计量校准,为测量仪器提供量值溯源。
[Abstract]:Aerosol optical property is an important factor affecting atmospheric radiative forcing and plays a decisive role in global climate. The measurement uncertainty is high and the traceability system is not perfect. In this paper, the photoacoustic spectroscopy (PAS) technique and the optical cavity ring-down spectroscopy (CRDS) technique are combined to realize the simultaneous on-line measurement of aerosol extinction, absorption and scattering coefficients. A set of high precision on-line measurement device for atmospheric aerosol multi-optical parameters has been developed. After calibrated by NO2 gas standard material, the apparatus has been used to measure the optical properties of atmospheric aerosol. The relative error of measurement is less than 4, the repeatability of measurement is better than 0.2% and the uncertainty of measurement is 2. 8%. Compared with the field experiment data of integral turbidimeter and black carbon meter, the extinction coefficient of the apparatus is measured in this paper. The absorption coefficient and scattering coefficient of E _ n are less than 1, which shows good consistency and stability. The experimental results show that the apparatus has the capability of multi-parameter measurement, and the measurement results are accurate and reliable. It can be used in the field real time measurement of atmospheric aerosol optical properties, and can also be used for the measurement calibration of related measuring instruments, which can provide the measuring instruments with traceability.
【作者单位】：浙江省计量科学研究院浙江省能源与环境保护计量检测重点实验室;
【基金】：浙江省省属科研院所专项(2015F10024,2016F30014) 浙江省质监系统重大科研项目(20140111,20160113) 杭州市重大科技创新专项(20142013A25) 科技厅公益项目(2015C31127) 国家重点研发计划重大科学仪器设备开发重点专项(2016YFF0103202,2016YFF0103204)资助项目
【分类号】：X513;X831

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