Aerosol mass spectrometer
An aerosol and mass spectrometer technology, applied in the direction of spectrometer detectors, electrical components, sample introduction/extraction, etc., can solve the problems of poor quantitative measurement performance, reduce instrument use costs, improve instrument use efficiency, and reduce storage capacity and the effect of analyzing the difficulty of
Inactive Publication Date: 2019-03-05
TIANYUAN HUAWEI GRP
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Problems solved by technology
[0004] Aerosol mass spectrometers with different technical routes have different characteristics. Aerosol mass spectrometers based on electron impact ionization technology can analyze most inorganic and organic substances, and can perform quantitative analysis, but cannot gasify refractory substances such as carbon dioxide silicon etc.
The aerosol mass spectrometer based on laser analysis and ionization technology can analyze / ionize all substances, and can be used to study refractory particles such as sand and dust. It has high sensitivity and has obvious advantages in analyzing metal elements in aerosols. Its disadvantage is quantitative measurement. poor performance
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[0010] The main part of the aerosol mass spectrometer is composed of four parts: a beam source chamber 1, a particle size measurement chamber 2, a gasification ionization chamber 3 and a W-type reflective mass device 4. The specific implementation method is: one, the aerosol is directly inhaled from the atmosphere by the sampling hole 5 with a diameter of about 100 microns; two, the shut-off valve 6 can control whether to sample or not; three, then the aerosol particles enter the pneumatic focusing lens group 7, and the pneumatic focusing The lens group consists of a series of discs with an aperture of 2-5 mm. In the aerodynamic focusing lens group, the aerosol particles are accelerated and focused to form an aerosol particle flow with a diameter of about 0.5 mm; 4. The aerosol particles from the beam source 1 and the particle diameter The small hole between the measurement chambers 2 enters the particle size measurement chamber 2, and meets the particle size selector in the pa...
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The invention relates to an aerosol mass spectrometer which can be simultaneously detecting grain size, concentration and chemical component of atmospheric aerosol. The aerosol mass spectrometer employs a sampling hole with a diameter being about 100 micrometers to direct sample aerosol under a natural environment, aerosol particle is focused to form particle beam with a diameter being about 0.5 millimeter by a pneumatic focusing lens, the aerosol particle is selected by a grain size selector, the grain size selector comprises three coaxial rotation discs with slots, the rotation discs of thegrain size selector are driven by a synchronous motor, the frequency of a synchronous motor power supply is continuously adjustable, the aerosol particles selected by the gain size selector is gasified by a high-temperature (600-700 DEG C) gasifier, the gasified gas is ionized by an electron collision ionization device, the generated ions are detected by a W-shaped reflection-type mass spectrum device, and the mass spectrum of the aerosol is obtained. By analyzing the sampling rate, the frequency of the synchronous motor power supply and the obtained mass spectrum, the information of the grainsize, the concentration and the chemical composition of the organic aerosol can be obtained.
Description
technical field [0001] The invention relates to an aerosol mass spectrometer, which can measure the particle size, concentration and chemical composition of atmospheric aerosol particles online. Background technique [0002] In recent years, aerosol pollution has become the main form of air pollution in large and medium-sized cities in my country. Aerosol pollution not only endangers the health of citizens, but also affects the image of the city, traffic and many other aspects. With the economic growth and the improvement of people's living standards, the monitoring and control of aerosol pollution has become a primary issue in the urban environment. The chemical composition of atmospheric aerosol is very complex, it contains various trace metals, inorganic oxides, sulfates, nitrates, hydrocarbons and oxygen-containing organic compounds. The traditional aerosol composition analysis method is to use a collector to collect the aerosol, and then use an analytical instrument (s...
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IPC IPC(8): H01J49/02H01J49/04
CPCH01J49/025H01J49/0409H01J49/0422
Inventor 孙延锋姜杰郭健顾大伟
Owner TIANYUAN HUAWEI GRP