技术领域technical field
本发明涉及一种气溶胶检测仪，尤其是一种气溶胶颗粒物形状与荧光检测仪。The invention relates to an aerosol detector, in particular to an aerosol particle shape and fluorescence detector.
背景技术Background technique
随着我国经济的高速发展，区域性大气气溶胶污染不断加重，一些城市经常出现长时间的雾霾天气，对公众的健康产生了严重的威胁，气溶胶污染已成为热点问题之一。大气气溶胶具有种类繁多的性质，不同种类的气溶胶粒子一般具有不同的粒形，较为简单的粒形包括球形(水滴或油滴)或条形(玻璃纤维)等，许多粒子具有较为复杂的形状，如石棉纤维、规则或不规则的晶体粒子等。With the rapid development of my country's economy, regional atmospheric aerosol pollution continues to increase. Some cities often experience long-term smog, which poses a serious threat to public health. Aerosol pollution has become one of the hot issues. Atmospheric aerosols have a wide variety of properties. Different types of aerosol particles generally have different particle shapes. The relatively simple particle shapes include spherical (water droplets or oil droplets) or strips (glass fiber), etc. Many particles have more complex shapes. Shape, such as asbestos fibers, regular or irregular crystal particles, etc.
空气中有各种各样的悬浮粒子，既有非生物粒子，也有生物粒子，还有生物粒子与非生物粒子吸附在一起的复合体，空气中生物颗粒是导致感染和疾病传播的根源，生物粒子细胞内含有蛋白质、核黄素、氨基酸、酶类等多种成分，其中有些具有标志其固有荧光的特定的激发和发射光谱。核黄素(俗称维生素B2)是一种典型的芳香族荧光物质，所有的活细菌和细菌芽孢都含有核黄素，其激发峰值在325-410nm，荧光发射在480-560nm之间，荧光强度可以作为判断其是否为生物颗粒的依据之一。There are all kinds of suspended particles in the air, including non-biological particles, biological particles, and complexes of biological particles and non-biological particles adsorbed together. Biological particles in the air are the root cause of infection and disease transmission. Particle cells contain proteins, riboflavin, amino acids, enzymes and other components, some of which have specific excitation and emission spectra that mark their intrinsic fluorescence. Riboflavin (commonly known as vitamin B2) is a typical aromatic fluorescent substance. All living bacteria and bacterial spores contain riboflavin. Its excitation peak is at 325-410nm, and its fluorescence emission is between 480-560nm. It can be used as one of the basis for judging whether it is a biological particle.
目前，人们为了快速、连续地识别气溶胶的种类作了一些有益的尝试和努力，如中国发明专利申请CN 105403489 A于2016年3月16日公布的本申请人的一种大气颗粒物的粒径与形状测量装置。该发明专利申请记载的测量装置由气溶胶束流进出样部件、光学采样部件和控制处理部件组成，其中，光学采样部件中的气溶胶形状光学采样器的采样光路位于气溶胶粒径光学采样器采样光路的下方；测量时，在控制处理部件的控制下，气溶胶束流进出样部件将大气中的气溶胶粒子以单个顺序排队的方式引进测量区后，先由气溶胶粒径光学采样器获得待测气溶胶粒子的空气动力学直径的信息，再由气溶胶形状光学采样器获得待测气溶胶粒子的形状信息。这种装置虽可用于对气溶胶颗粒物的粒径和形状进行实时的探测，却也存在着欠缺之处——不能同时探测气溶胶颗粒物的形状、尺寸和其特征荧光。At present, people have made some useful attempts and efforts to quickly and continuously identify the types of aerosols, such as the particle size with shape measuring device. The measurement device described in this invention patent application is composed of aerosol beam flow in and out sample components, optical sampling components and control processing components, wherein the sampling optical path of the aerosol shape optical sampler in the optical sampling component is located in the aerosol particle size optical sampler Below the sampling optical path; during measurement, under the control of the control processing unit, the aerosol beam flows in and out of the sample unit to introduce the aerosol particles in the atmosphere into the measurement area in a single sequence, and then the aerosol particle size optical sampler The information of the aerodynamic diameter of the aerosol particle to be measured is obtained, and then the shape information of the aerosol particle to be measured is obtained by the aerosol shape optical sampler. Although this device can be used to detect the particle size and shape of aerosol particles in real time, it also has a shortcoming—it cannot detect the shape, size and characteristic fluorescence of aerosol particles at the same time.
发明内容Contents of the invention
本发明要解决的技术问题为克服现有技术中的欠缺之处，提供一种结构合理、实用，能同时测定同一单个气溶胶粒子的形状、尺寸和荧光特性的气溶胶颗粒物形状与荧光检测仪。The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art and provide a reasonable and practical aerosol particle shape and fluorescence detector that can simultaneously measure the shape, size and fluorescence characteristics of the same single aerosol particle .
为解决本发明的技术问题，所采用的技术方案为，气溶胶颗粒物形状与荧光检测仪由连接的气溶胶束流进出样部件、光学采样部件和控制处理部件组成，特别是：In order to solve the technical problem of the present invention, the adopted technical solution is that the aerosol particle shape and fluorescence detector is composed of connected aerosol beam flow in and out sample components, optical sampling components and control processing components, especially:
所述光学采样部件由气溶胶形状采样组件和气溶胶荧光采样组件组成；The optical sampling component is composed of an aerosol shape sampling component and an aerosol fluorescence sampling component;
所述气溶胶形状采样组件为红色激光器及其光路上依次置有的红色激光整形透镜组、气溶胶测量作用区、红色激光吸收器、红色激光线滤光片、方位角选通器、散射光耦合透镜组、滤波光阑、散射光分束聚焦透镜组和三路光电探测阵面；The aerosol shape sampling component is a red laser and a red laser shaping lens group, an aerosol measurement action area, a red laser absorber, a red laser line filter, an azimuth gate, and a scattered light Coupling lens group, filter diaphragm, scattered light beam splitting focusing lens group and three-way photoelectric detection array;
所述气溶胶荧光采样组件由气溶胶荧光激发器件和气溶胶荧光测量器件组成，其中，The aerosol fluorescence sampling component is composed of an aerosol fluorescence excitation device and an aerosol fluorescence measurement device, wherein,
气溶胶荧光激发器件为紫外激光器及其光路上依次置有的紫外激光整形透镜组、气溶胶测量作用区和紫外激光吸收器，The aerosol fluorescence excitation device is an ultraviolet laser and an ultraviolet laser shaping lens group, an aerosol measurement action area and an ultraviolet laser absorber arranged in sequence on its optical path.
气溶胶荧光测量器件为光电探测器及其接收光路上依次置有的光阑、荧光耦合透镜组和带通滤光片组，其中的荧光耦合透镜组的一个焦点位于光电探测器处、另一个焦点位于气溶胶测量作用区；The aerosol fluorescence measurement device is a photodetector and a diaphragm, a fluorescence coupling lens group and a band-pass filter group arranged in sequence on the receiving light path, wherein one focal point of the fluorescence coupling lens group is located at the photodetector, and the other is located at the photodetector. The focus is located in the aerosol measurement area;
所述三路光电探测阵面的输出端、光电探测器的输出端与控制处理部件的输入端电连接，控制处理部件的输出端与紫外激光器的控制端电连接，用于当气溶胶形状采样组件获得的气溶胶的形状信息为非球形或尺寸信息≥1μm时，启动紫外激光器3工作，以同时获得气溶胶的荧光信息。The output end of the three-way photoelectric detection array and the output end of the photodetector are electrically connected to the input end of the control processing part, and the output end of the control processing part is electrically connected to the control end of the ultraviolet laser for sampling the shape of the aerosol When the shape information of the aerosol obtained by the component is non-spherical or the size information is greater than or equal to 1 μm, the ultraviolet laser 3 is activated to obtain the fluorescence information of the aerosol at the same time.
作为气溶胶颗粒物形状与荧光检测仪的进一步改进：As a further improvement of the aerosol particle shape and fluorescence detector:
优选地，红色激光器为输出波长650nm或635nm的半导体连续激光器。Preferably, the red laser is a semiconductor continuous laser with an output wavelength of 650nm or 635nm.
优选地，红色激光线滤光片的透射波长为650nm或635nm。Preferably, the transmission wavelength of the red laser line filter is 650nm or 635nm.
优选地，方位角选通器为其上置有等方位角设置的三只通光孔的遮光板。Preferably, the azimuth selector is a light-shielding plate with three light holes arranged at equal azimuth angles.
优选地，散射光分束聚焦透镜组为位于三只通光孔后续光路上的三只分束透镜。Preferably, the scattered light beam-splitting focusing lens group is three beam-splitting lenses located on the subsequent optical path of the three apertures.
优选地，三路光电探测阵面为分别位于三只分束透镜焦点处的三只光电倍增管。Preferably, the three photodetection arrays are three photomultiplier tubes respectively located at the focal points of the three beam splitting lenses.
优选地，紫外激光器为输出波长349nm的脉冲激光器。Preferably, the ultraviolet laser is a pulsed laser with an output wavelength of 349nm.
优选地，带通滤光片组的透射波长为420-600nm。Preferably, the transmission wavelength of the bandpass filter set is 420-600nm.
优选地，气溶胶束流进出样部件的组成为，六面棱柱腔的上端置有气溶胶束流进样口、下端置有气溶胶束流抽气出口，位于两者间的气溶胶测量作用区中的待测气溶胶粒子的采样流量为1-1.2L/min。Preferably, the composition of the aerosol beam flow into and out of the sample part is that the upper end of the hexahedral prism cavity is provided with an aerosol beam flow inlet, and the lower end is provided with an aerosol beam flow exhaust outlet, and the aerosol measurement function between the two The sampling flow rate of the aerosol particles to be measured in the zone is 1-1.2 L/min.
优选地，红色激光器的红色激光束的焦点位于气溶胶束流进样口的下端0.5-1mm处，紫外激光器的紫外激光束的焦点位于红色激光束焦点的下方0.2-0.4mm处。Preferably, the focus of the red laser beam of the red laser is located at 0.5-1 mm below the aerosol beam inlet, and the focus of the ultraviolet laser beam of the ultraviolet laser is located at 0.2-0.4 mm below the focus of the red laser beam.
相对于现有技术的有益效果是：The beneficial effects relative to the prior art are:
采用这样的结构后，本发明对同一单个气溶胶粒子的形状、尺寸和荧光特性能同时实时测定，尤为通过测定的荧光强度可以判断出其是否为对人们的健康产生严重威胁的根源——生物气溶胶。After adopting such a structure, the present invention can simultaneously measure the shape, size and fluorescence characteristics of the same single aerosol particle in real time, especially through the measured fluorescence intensity, it can be judged whether it is the source of a serious threat to people's health—biological aerosol.
本发明将探测同一单个气溶胶粒子的形状、尺寸和荧光特性进行有机的结合，并基于对形状参数和尺寸参数的判断，既减小了环境背景颗粒物——球形液滴和较小尺寸粒子的干扰，又提高了气溶胶类别检测的效率，从而极大地提升了对生物气溶胶的检测与识别能力；使其在环境大气污染探测，尤其是人为致病气溶胶的探测方面，有着广泛的应用前景。The present invention organically combines the detection of the shape, size and fluorescence characteristics of the same single aerosol particle, and based on the judgment of the shape parameter and size parameter, it not only reduces the environmental background particles—spherical droplets and particles of smaller size Interference improves the efficiency of aerosol category detection, thereby greatly improving the ability to detect and identify biological aerosols; it has a wide range of applications in the detection of environmental air pollution, especially the detection of man-made pathogenic aerosols prospect.
附图说明Description of drawings
图1是本发明的一种基本结构示意图。Fig. 1 is a kind of basic structure schematic diagram of the present invention.
图2是本发明中气溶胶束流进出样部件的一种基本结构示意图。Fig. 2 is a schematic diagram of a basic structure of an aerosol beam flowing in and out of a sample component in the present invention.
图3是本发明探测气溶胶单个粒子后获取的四路光散射信号图之一。图中的曲线30-1、曲线30-2和曲线30-3分别为气溶胶形状采样组件中的三只光电倍增管的输出；曲线30为气溶胶形状采样组件中三只光电倍增管输出的总和；曲线40为气溶胶荧光测量器件中的光电探测器的输出。Fig. 3 is one of the four-way light scattering signal diagrams acquired after detecting a single aerosol particle in the present invention. Curve 30-1, curve 30-2 and curve 30-3 in the figure are the output of three photomultiplier tubes in the aerosol shape sampling assembly respectively; Curve 30 is the output of three photomultiplier tubes in the aerosol shape sampling assembly Sum; Curve 40 is the output of the photodetector in the aerosol fluorescence measurement device.
图4是本发明实测气溶胶粒子形状的结果图之一。Fig. 4 is one of the result graphs of the present invention measured aerosol particle shape.
图5是本发明实测气溶胶粒子荧光的结果图之一。由其可看出，当被测气溶胶粒子——核黄素气溶胶粒子的形状为非球形时，其荧光强度非常强且分布宽，最大可达到64通道。Fig. 5 is one of the result graphs of the measured aerosol particle fluorescence in the present invention. It can be seen from it that when the shape of the measured aerosol particle—riboflavin aerosol particle is non-spherical, its fluorescence intensity is very strong and the distribution is wide, and the maximum can reach 64 channels.
具体实施方式Detailed ways
下面结合附图对本发明的优选方式作进一步详细的描述。The preferred modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.
参见图1和图2，气溶胶颗粒物形状与荧光检测仪的构成如下：Referring to Figure 1 and Figure 2, the shape of aerosol particles and the composition of the fluorescence detector are as follows:
检测仪由连接的气溶胶束流进出样部件、光学采样部件和控制处理部件组成，其中：The detector is composed of connected aerosol beam flow in and out sample parts, optical sampling parts and control processing parts, among which:
气溶胶束流进出样部件的组成为，六面棱柱溶胶测量作用区5中的待测气溶胶粒子22的采样流量为1(可为1-1.2)L/min。The composition of the aerosol beam flowing in and out of the sample component is that the sampling flow rate of the aerosol particles 22 to be measured in the hexagonal prism sol measurement action area 5 is 1 (can be 1-1.2) L/min.
红色激光器1的红色激光束19的焦点位于气溶胶束流进样口21的下端0.8(可为0.5-1)mm处，紫外激光器3的紫外激光束20的焦点位于红色激光束19焦点的下方0.3(可为0.2-0.4)mm处。The focal point of the red laser beam 19 of red laser device 1 is positioned at the lower end 0.8 (can be 0.5-1) mm of the aerosol beam flow inlet 21, and the focal point of the ultraviolet laser beam 20 of ultraviolet laser device 3 is positioned at the below of red laser beam 19 focal points 0.3 (can be 0.2-0.4) mm.
光学采样部件由气溶胶形状采样组件和气溶胶荧光采样组件组成；其中的，The optical sampling component is composed of an aerosol shape sampling component and an aerosol fluorescence sampling component; wherein,
气溶胶形状采样组件为红色激光器1及其光路上依次置有的红色激光整形透镜组2、气溶胶测量作用区5、红色激光吸收器8、红色激光线滤光片9、方位角选通器10、散射光耦合透镜组11、滤波光阑12、散射光分束聚焦透镜组13和三路光电探测阵面14。其中，红色激光器1为输出波长650(或635)nm的半导体连续激光器；红色激光线滤光片9的透射波长为650(或635)nm；方位角选通器10为其上置有等方位角设置的三只通光孔的遮光板；散射光分束聚焦透镜组13为位于三只通光孔后续光路上的三只分束透镜；三路光电探测阵面14为分别位于三只分束透镜焦点处的三只光电倍增管。The aerosol shape sampling component is a red laser 1 and a red laser shaping lens group 2, an aerosol measurement action area 5, a red laser absorber 8, a red laser line filter 9, and an azimuth selector arranged sequentially on its optical path 10. Scattered light coupling lens group 11 , filter diaphragm 12 , scattered light beam splitting focusing lens group 13 and three-way photoelectric detection array 14 . Wherein, the red laser 1 is a semiconductor continuous laser with an output wavelength of 650 (or 635) nm; the transmission wavelength of the red laser line filter 9 is 650 (or 635) nm; The shading plates of three light-through holes arranged at the angle; the scattered light beam-splitting focusing lens group 13 is three beam-splitting lenses located on the follow-up optical path of the three light-through holes; the three-way photoelectric detection array 14 is respectively located Three photomultiplier tubes at the focal point of the beam lens.
气溶胶荧光采样组件由气溶胶荧光激发器件和气溶胶荧光测量器件组成；其中，The aerosol fluorescence sampling component is composed of an aerosol fluorescence excitation device and an aerosol fluorescence measurement device; wherein,
气溶胶荧光激发器件为紫外激光器3及其光路上依次置有的紫外激光整形透镜组4、气溶胶测量作用区5和紫外激光吸收器7。其中，紫外激光器3为输出波长349nm的脉冲激光器。The aerosol fluorescence excitation device is an ultraviolet laser 3 and an ultraviolet laser shaping lens group 4 , an aerosol measurement action area 5 and an ultraviolet laser absorber 7 arranged in sequence on its optical path. Wherein, the ultraviolet laser 3 is a pulsed laser with an output wavelength of 349 nm.
气溶胶荧光测量器件为光电探测器18及其接收光路上依次置有的光阑17、荧光耦合透镜组16和带通滤光片组15。其中，荧光耦合透镜组16的一个焦点位于光电探测器18处、另一个焦点位于气溶胶测量作用区5；带通滤光片组15的透射波长为420-600nm。The aerosol fluorescence measurement device is a photodetector 18 and a diaphragm 17 , a fluorescence coupling lens group 16 and a band-pass filter group 15 arranged sequentially on its receiving light path. Among them, one focal point of the fluorescence coupling lens group 16 is located at the photodetector 18, and the other focal point is located at the aerosol measurement action area 5; the transmission wavelength of the bandpass filter group 15 is 420-600 nm.
控制处理部件为计算机，其输入端与三路光电探测阵面14的输出端、光电探测器18的输出端电连接，输出端与紫外激光器3的控制端电连接。The control processing part is a computer, its input end is electrically connected with the output end of the three-way photoelectric detection array 14 and the output end of the photodetector 18 , and the output end is electrically connected with the control end of the ultraviolet laser 3 .
气溶胶颗粒物形状与荧光检测仪的测量过程及其结果参见图1、图2、图3、图4和图5。See Figure 1, Figure 2, Figure 3, Figure 4 and Figure 5 for the measurement process and results of the aerosol particle shape and fluorescence detector.
在控制处理部件的控制之下，含有待测气溶胶粒子22的束流自气溶胶束流进样口21流出，经过气溶胶测量作用区5后，由气溶胶束流抽气出口23被泵出。Under the control of the control processing unit, the beam containing the aerosol particles 22 to be measured flows out from the aerosol beam inlet 21, and after passing through the aerosol measurement area 5, the aerosol stream exhaust outlet 23 is pumped out.
含有待测气溶胶粒子22的束流在途经气溶胶测量作用区5时，其中的待测气溶胶粒子22首先与气溶胶形状采样组件的红色激光整形透镜组2输出的红色激光束19作用，其散射光经红色激光线滤光片9滤除干扰光后，通过方位角选通器10上等方位角设置的三只通光孔选通透射，再经散射光耦合透镜组11、滤波光阑12和散射光分束聚焦透镜组13到达三路光电探测阵面14，由三路光电探测阵面14将其转化为如图3中的曲线30-1、曲线30-2和曲线30-3所示的电信号。该三路光电探测阵面14输出总和的电信号如曲线30所示。When the beam containing the aerosol particles 22 to be measured passes through the aerosol measurement action area 5, the aerosol particles 22 to be measured first interact with the red laser beam 19 output by the red laser shaping lens group 2 of the aerosol shape sampling component, After the scattered light is filtered by the red laser line filter 9 to filter out the interfering light, it is gated and transmitted through the three light-passing holes set at the azimuth angle on the azimuth selector 10, and then through the scattered light coupling lens group 11, the filtered light The diaphragm 12 and the scattered light beam splitting focusing lens group 13 arrive at the three-way photoelectric detection front 14, which is converted into the curve 30-1, the curve 30-2 and the curve 30- 3 shows the electrical signal. The three-way photoelectric detection array 14 outputs a summed electrical signal as shown in curve 30 .
之后，待测气溶胶粒子22于气溶胶测量作用区5中继续向下运动，途经气溶胶荧光激发器件的紫外激光整形透镜组4输出的紫外激光束20的焦点中时，紫外激光作用于待测气溶胶粒子22，使其产生荧光。该荧光被气溶胶荧光测量器件中的荧光耦合透镜组16收集并送至光电探测器18，由光电探测器18将其转化为如图3中的曲线40所示的电信号。Afterwards, the aerosol particle 22 to be measured continues to move downward in the aerosol measurement action area 5, and when it passes through the focus of the ultraviolet laser beam 20 output by the ultraviolet laser shaping lens group 4 of the aerosol fluorescence excitation device, the ultraviolet laser acts on the target area. The aerosol particles 22 are detected to make them fluoresce. The fluorescence is collected by the fluorescence coupling lens group 16 in the aerosol fluorescence measurement device and sent to the photodetector 18, which converts it into an electrical signal as shown by the curve 40 in FIG. 3 .
控制处理部件收到信号30-1、信号30-2和信号30-3后，先基于这三只光电倍增管输出的电信号和其相对的位置信息，由公式After the control processing unit receives the signal 30-1, the signal 30-2 and the signal 30-3, first based on the electrical signals output by the three photomultiplier tubes and their relative position information, the formula
式中的E1、E2、E3分别为三只光电倍增管输出的电信号强度，得出待测气溶胶粒子22的形状，即，当待测气溶胶粒子22的形状为球形时，因为E1＝E2＝E3，则Rf＝0；当待测气溶胶粒子22的形状为非球形粒子时，粒子的纵横比越大，则Rf值就越大。本发明采用的是三个像元光电倍增管来探测信号强度值，以计算变化因子Rf。如图4所示，本发明实测多分散性油酸及核黄素气溶胶粒子的结果为，油酸(球形)气溶胶粒子的Rf值的中心为10，其Rf范围在0-25之间；核黄素(非球形)气溶胶粒子Rf值的中心为80，Rf范围在30-90之间。E1 , E2 , and E3 in the formula are the electrical signal strengths output by the three photomultiplier tubes respectively, and the shape of the aerosol particle 22 to be measured is obtained, that is, when the shape of the aerosol particle 22 to be measured is spherical, Because E1 =E2 =E3 , then Rf =0; when the shape of the aerosol particle 22 to be measured is a non-spherical particle, the larger the aspect ratio of the particle, the larger the Rf value. The present invention uses three pixel photomultiplier tubes to detect signal strength values to calculate the variation factor Rf . As shown in Figure 4, the result of the present invention's measured polydispersity oleic acid and riboflavin aerosol particle is that the center of the Rf value of oleic acid (spherical) aerosol particle is 10, and its Rf scope is at 0-25 The center of Rf value of riboflavin (non-spherical) aerosol particles is 80, and the Rf range is between 30-90.
控制处理部件再根据三只光电倍增管输出的总和——如图3中的曲线30所示，来参照气溶胶标准粒子的粒径得出待测气溶胶粒子22的粒径。The control processing unit then calculates the particle size of the aerosol particle 22 to be measured by referring to the particle size of the aerosol standard particle based on the sum of the outputs of the three photomultiplier tubes—as shown by the curve 30 in FIG. 3 .
当测定的待测气溶胶粒子22的形状信息为非球形或尺寸信息≥1μm时，控制处理部件启动紫外激光器3工作，以由光电探测器18处得到如图3中的曲线40所示的电信号，并由其得出气溶胶的荧光信息。When the shape information of the aerosol particle 22 to be measured is non-spherical or the size information ≥ 1 μm, the control processing unit starts the ultraviolet laser 3 to work, so as to obtain the electric current shown in the curve 40 in Fig. 3 by the photodetector 18. signal, from which the fluorescence information of the aerosol can be obtained.
显然，本领域的技术人员可以对本发明的气溶胶颗粒物形状与荧光检测仪进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若对本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。Obviously, those skilled in the art can make various changes and modifications to the aerosol particle shape and fluorescence detector of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies, the present invention also intends to include these modifications and variations.
| Application Number | Priority Date | Filing Date | Title |
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| CN201711364267.9ACN108169084B (en) | 2017-12-18 | 2017-12-18 | Aerosol particle shape and fluorescence detector |
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| CN201711364267.9ACN108169084B (en) | 2017-12-18 | 2017-12-18 | Aerosol particle shape and fluorescence detector |
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