Light scattering-based monodisperse aerosol particle size and concentration measuring device
A concentration measurement, monodisperse technology, applied in measurement devices, particle size analysis, particle suspension analysis, etc., can solve the problem that the particle size and concentration of monodisperse aerosol cannot be quickly detected at the same time, and achieve a simple and reasonable measurement device and a large measurement range. , the effect of low cost
Active Publication Date: 2016-02-17
ZHEJIANG MEASUREMENT SCI RES INST
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[0004] In order to solve the technical problem that existing instruments in the prior art cannot quickly detect the particle size and concentration of high-concentration monodisperse aerosols produced by standard aerosol generators at the same time, the present invention p
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[0017] Such as figure 1 and 2 As shown, a monodisperse aerosol particle size and concentration measurement device based on light scattering, which includes a laser 1, an optical attenuator 2, a beam expander 2, a first diaphragm 4, a cylindrical mirror 5, a scattering cavity 6, Data acquisition card 7 and computer 8. In the figure, the thin solid line indicates the optical path and the arrow indicates the direction of light propagation; the double-dot dash line indicates the air path, and the arrow indicates the airflow direction; the dotted line indicates the electrical connection line. Laser 1 uses a 632nm He-N2 laser with a power of about 20mW, and the emitted beam diameter is 1mm collimated beam. The first diaphragm 4 is an aperture diaphragm, and the aperture of the diaphragm is 3 mm. The focus of the cylindrical mirror 5 is located at the center of the photosensitive area. The light beam emitted by the first aperture 4 passes through the cylindrical mirror 5 and becom...
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Abstract
The invention provides a light scattering-based monodisperse aerosol particle size and concentration measuring device, and belongs to the technical field of measuring. According to the light scattering-based monodisperse aerosol particle size and concentration measuring device, light beam emitted by a laser passes through an optical attenuator, a beam expander, a first diaphragm, and a scattering cavity, and enters into a light trap; the upper wall and the lower wall of the scattering cavity are provided with a gas inlet pipe and a gas outlet pipe; a photosensitive area is formed via cross of the connection line of the gas inlet pipe and the gas outlet pipe with the light beam; a spherical mirror is arranged in the scattering cavity; and the focus of the spherical mirror and the center of the photosensitive area are superposed. The light scattering-based monodisperse aerosol particle size and concentration measuring device is capable of solving a technical problem that simultaneous rapid detection on particle size and concentration of high concentration monodisperse aerosol generated by standard aerosol generators can not be realize using conventional instrument. Beneficial effects are that, light scattering principles are adopted, particle counting method of pulse detection and spectrophotometric method of direct-current level detection are combined, rapid detection of the particle size and concentration of monodisperse aerosol can be realized without using filter membranes and destroying aerosol particles . The light scattering-based monodisperse aerosol particle size and concentration measuring device is used for providing means for calibration and source tracing of aerosol particle size and concentration detection-related instrument.
Description
technical field [0001] The invention relates to a testing and measuring device, in particular to an aerosol particle size and concentration measuring device for calibrating PM2.5 automatic monitors. Background technique [0002] Aerosol haze has brought many adverse effects to people's life and social development, among which the most significant increase and the greatest impact on the human body are inhalable particulate matter with a diameter of less than 10um, which are commonly referred to as PM2.5 and PM10. Therefore, more and more attention is paid to the monitoring of fine particulate matter. At present, the automatic monitoring of air particulate matter used at home and abroad is mainly based on the β-ray method and the micro-oscillating balance method. Due to the different measurement principles, there is a certain gap between the data obtained by the two monitoring instruments. Since my country has not issued corresponding standards for PM2.5 automatic monitoring...
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Inventor 李国水张建锋陈哲敏杨眉
Owner ZHEJIANG MEASUREMENT SCI RES INST
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