With the increasing attention paid to ambient air quality, air samplers, as an important environmental monitoring equipment, are widely used in air quality monitoring, pollution source monitoring and other fields. air sampler The light scattering method or filter membrane weighing method is mainly used to measure the particles in the atmosphere. The light scattering method calculates the particle concentration by measuring the light scattering intensity of particles; The filter membrane weighing method calculates the concentration by collecting particles and measuring their weight.
1. Light scattering method
Light scattering method is one of the commonly used measurement methods in atmospheric sampler. The laser source in the sampler emits a laser beam, which is irradiated into the sampling stream through the optical path system. When the laser beam encounters particles, scattering will occur. The particle concentration can be calculated by measuring the scattered light intensity.
2. Filter membrane weighing method
The filter membrane weighing method calculates the concentration of particles by collecting and measuring the weight of particles. The air pump in the sampler sucks air into the sampler and captures particles through the filter membrane. After a period of sampling, the filter membrane is weighed to obtain the concentration of particles.
Analysis of key technologies
1. Flow control technology
Its flow control technology is one of the keys to ensure the accuracy of sampling. The sampler needs to control the flow in a stable range to ensure the reliability of the sampling results. Common flow control technologies include mechanical flowmeter, electronic flowmeter, etc.
2. Particle cutting technology
It is also necessary to cut the particles to adapt to the measurement of particles with different sizes. The quality of cutting technology directly affects the accuracy of sampling results. At present, the commonly used cutting technologies in atmospheric samplers include cyclone cutting, impact cutting, etc.
3. Data processing technology
Its data processing technology is also one of the keys. Data processing includes processing, analyzing and storing the collected data. Modern atmospheric samplers are usually equipped with high-performance processors and memories to ensure the efficiency and accuracy of data processing.
