PB-FRH100 Aerosol Moisture Absorption Measurement Instrument

Instrument Introduction:

Aerosol hygroscopicity growth refers to the process in which the particle size of aerosols increases with the relative humidity of the environment. It reflects the water absorption capacity of aerosols and is one of the important physical and chemical parameters of aerosols. It has a significant impact on aerosol radiation optics, aerosol chemistry, and aerosol cloud interactions. Aerosol hygroscopicity characteristics are an important research topic in climate change studies, atmospheric remote sensing, cloud precipitation physics, and atmospheric chemistry.

Main functions:

The PB-FRH 100 aerosol hygroscopicity measuring instrument is based on the research results of Peking University and mainly measures the aerosol scattering hygroscopicity growth factor. Its main functions are as follows:

1. Real time measurement of the scattering coefficient of aerosols within a specified relative humidity range in the blue, green, and red bands;

2. Real time measurement of aerosol scattering and moisture absorption growth factor f (RH) in three bands with high time resolution;

3. Obtain aerosol hygroscopicity parameters;

4. Obtain Aerosol Liquid Water Content (ALWC).

Instrument characteristics:

*Automatic calibration and status diagnosis of instruments;

*High time resolution, f (RH) measurement can be as low as 30 minutes;

*The relative humidity range is adjustable (40%~92%);

*Adjustable cycle period (30min~90min);

*Visualization of observation data;

*Real time saving of observation images;

Technical parameters:

Relative humidity control range: 40%~92%;

Flow rate: 5 L/min;

Temperature sensor accuracy: ± 0.2 ° C (0~40 ℃);

Relative humidity sensor accuracy: ± 1.5% RH (0~90% RH);

Drying tube material: Nafion;

Humidifier tube material: Nafion;

Scattering coefficient measurement: Three band measurement, 450nm (blue), 525nm (green), and 635nm (red);

Measurement range: σ sp 0 to>20000Mm-1;

Minimum detection limit: 0.3Mm-1 (1-minute average);

Total scattering angle: 9 ° -170 °, backscatter angle: 90 ° -170 °;

Secondary measurement: sample gas temperature, chamber temperature, RH, and sample gas pressure;

Light source: Stable LED light source (patent number: US7671988);

F (RH) measurement cycle: about 30-90 minutes, can be set by oneself;

System control: Labview software;

Calibration: Regular automatic zero and cross calibration checks can be set for the scattering coefficient measurement unit;

Fault prompt: Instrument diagnosis, automatic alarm, automatic shutdown;

Parallel property control of data: The software has parallel periods and can detect the parallelism of aerosol scattering coefficients;

Output data:

System parameters such as temperature, relative humidity, and flow rate;

Three band scattering coefficient under specified relative humidity;

Aerosol scattering hygroscopic growth factor f (RH);

Subsequently, aerosol liquid water content (ALWC) can be obtained through data processing;

Communication interface: fanless embedded industrial computer, 6-RS232, 6-USB, 2-TCP/IP; Ethernet ports HDMI, VGA;

Working environment: Temperature: 15 ℃ to 30 ℃; Relative humidity: 10% to 95%;

Power supply: 250VAC, 50Hz;

Application case:

*Atmospheric visibility research;

*Aerosol chemistry research;

*Study on the extinction ability and characteristics of aerosols;

*Assessment of direct radiation effects of aerosols;

*Climate change research;

*Atmospheric remote sensing research.