Device for on-line measurement of atmospheric particulate matter concentration

Abstract

The invention discloses a device for on-line measurement of atmospheric particulate matter concentration, which comprises a sampling system, a main mounting plate, a detection mechanism, a sampling head lifting mechanism and a filter paper tape quantitative moving mechanism, wherein the sampling system comprises a particulate matter cutter, a sampling tube, a PU tube, a gas flowmeter and a sampling pump; the detection mechanism comprises a measurement block, a beta ray source and a scintillation detector; the sampling head lifting mechanism comprises a cam, a compression spring, a sampling pressure head and a sampling pressure head sleeve; and the sampling pressure head sleeve is fixed on the sampling pressure head. The device relates to the technical field of atmospheric particulate matter concentration monitoring. The device for on-line measurement of atmospheric particulate matter concentration has modular design of each mechanism and simple structure. The sampling head lifting device can ensure the airtightness of a filter paper tape when the atmospheric particulate matter concentration monitoring device is sampling; and a driving shaft optically-coupled baffle and a driving shaft photoelectric switch are arranged on the filter paper tape quantitative moving mechanism, so that accurate and quantitative movement of the paper tape can be realized.

Description

technical field [0001] The invention relates to the technical field of atmospheric particle concentration monitoring, in particular to a device for online measurement of atmospheric particle concentration. Background technique [0002] At present, there are generally weighing methods, β-ray methods, light scattering methods, and oscillatory balance methods for measuring the concentration of atmospheric particulate matter on the market. The weighing method is the most accurate method among all detection methods of atmospheric particulate matter concentration, but its sampling time is long, sampling and weighing cannot be carried out continuously, and online monitoring cannot be realized. The light scattering method uses the frequency and duration of the flash reflected by the particles in the airflow to measure the content of the particles, but it is greatly affected by the size and composition of the particles, and there is no corresponding standard in the country. Therefore...

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Problems solved by technology

The weighing method is the most accurate method among all atmospheric particle concentration detection methods, but its sampling time is long, sampling and weighing cannot be carried out continuously, and online monitoring cannot be realized

The light scattering method uses the frequency and duration of the flash reflected by the particles in the airflow to measure the content of the particles, but it is greatly affected by the size and composition of the particles, and there is no corresponding standard in the country. Therefore, The technology is not yet in mass use

Oscillating balance method has the periodic error that the measurement results obtained in different seasons and weighing method are sometimes high and sometimes low, and the price is expensive

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