3nm-20μm aerosol particle size distribution measuring instrument

Abstract

The invention discloses a 3 nanometer-20 micrometer aerosol particle size distribution measuring apparatus, and belongs to the technical field of environment aerosol measurement. The measuring apparatus integrates an aerodynamic particulate matter size spectrometer, a nano-particulate matter differential electromobility analyzer, a nano-particulate matter condensation nucleus particle counter, a sub-micron particulate matter differential electromobility analyzer and a sub-micron particulate matter condensation nucleus particle counter, and is characterized in that a voltage / flow control box is used to provide hierarchical voltages and sheath gas to the two particulate matter analyzers; a data acquisition card is used to synchronously acquire impulse signals of the particulate matter size spectrometer and the two particle counters; and a measurement control system is used to control the voltage output and sheath gas flow of the voltage / flow control box, process and analyze the impulse signals input to the data acquisition card, and output a two-dimensional diagram showing a 3 nanometer-20 micrometer particle size distribution spectrum and a three-dimensional diagram containing a time series. The measuring apparatus disclosed by the invention has the beneficial effects that the measurement is precise, the apparatus operation is simple, and the apparatus can provide technical support for atmosphere combined pollution and nanometer scientific research.

Description

Technical field [0001] The invention belongs to the technical field of environmental aerosol measurement, and particularly relates to an instrument that can measure the particle size distribution of aerosols from 3 nm to 20 μm. Background technique [0002] In recent years, people have paid more and more attention to the pollution of atmospheric particles, hoping to obtain information on the number concentration and particle size distribution of atmospheric particles. At present, the measurement of atmospheric particle number concentration and particle size distribution mainly relies on electrical and optical technology, and there are some commercial instruments. However, the particle size span of atmospheric particles is very wide, from a few nanometers to tens of microns, which makes it difficult for a technique to measure the full particle size distribution spectrum (that is, the particle size distribution of 3nm-20μm particles). Existing commercial instruments can only obtai...

AI Technical Summary

Problems solved by technology

However, the particle size span of atmospheric particulate matter is very wide, from a few nanometers to tens of microns, making it difficult for a technology to measure the full particle size distribution spectrum (ie, the particle size distribution of 3nm-20μm particles)

Existing commercial instruments can only obtain a relatively narrow particle size distribution in the nanometer, or submicron, or micron range when measuring the particle size distribution of atmospheric particles, such as the particle size distribution measured by the commonly used aerodynamic particle size spectrometer. The diameter range is about 530nm to 20μm; the particle size range measured by conventional scanning electric mobility particle size spectrometer is about 20nm to 800nm; the particle size range measured by nanoparticle scanning electric mobility particle size spectrometer is about 3nm to 150nm

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