A comprehensive measuring instrument for aerosol hygroscopic properties

Abstract

The invention discloses a comprehensive measurement instrument for aerosol hygroscopic properties, comprising an aerosol pretreatment system, a first particle screening system, a humidification system, a second particle screening system, a dilution humidification system, a condensed particle counting system, a compressed air system, and a temperature control system. Humidity monitoring and calibration system, parameter measurement system, signal acquisition and control system. Through the technical scheme of the invention, the humidification flow rate is large, the humidification is fast, the measurement precision is high, and self-correction is possible.

Description

technical field [0001] The invention belongs to the technical field of environmental detection, and in particular relates to an instrument for comprehensive measurement of aerosol moisture absorption, moisture absorption growth factor, and optical, density, shape and other characteristics before and after moisture absorption. Background technique [0002] Atmospheric aerosols can directly absorb and scatter solar radiation, and have a direct impact on atmospheric radiative forcing; for aerosols with relatively strong hygroscopic properties, when the relative humidity in the atmosphere increases, the aerosols will absorb moisture and grow into cloud condensation nuclei. Facilitating cloud formation and altering cloud residence time and one-sided albedo have indirect effects on atmospheric radiative forcing. Atmospheric aerosols have great uncertainty in the radiative forcing effect of aerosols due to the complexity of their composition and the diversity of temporal and spatia...

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Problems solved by technology

[0004] The flow rate of H-TDMA is relatively small, and the follow-up measuring instrument of H-TDMA is only one Condensation Particle Counter (CPC). When it is necessary to observe the characteristics before and after moisture absorption such as optics and density, it is difficult to satisfy, and the observed moisture absorption characteristics are not systematic; the humidification speed is slow, and the current H-TDMA mainly adopts two-stage humidification, and the aerosol needs to be humidified from a very low relative humidity to a specific relative humidity. Humidity, long humidification time, slow speed; low measurement accuracy, no self-calibration, currently used temperature and humidity sensors have relatively low measurement accuracy, and once the sensor measures relative humidity errors, the problem cannot be found immediately, which may lead to measurement errors There is a large deviation in the data

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