[Retracted] Detection of Particle Concentration and Particle Size Based on Aerodynamic Particle Size Spectrometer

Table 1

Advantages and disadvantages of each method.

Methods	Advantages	Disadvantages
Extinction method	Simple structure, easy to implement	The sensitivity is not high and is affected by particle size distribution and refractive index
Beta-ray absorption method	The measurement results are independent of particle size, color, and composition	It requires constant sampling, high cost, and long measurement time
Micro-oscillating balance method	The measurement results are independent of particle size, color, and composition	Affected by humidity, the membrane is easy to plug
Charge transfer method	The system is simple and mainly used for engine exhaust concentration detection	Due to the influence of particle size change, composition change, and water droplets, calibration is required before use
Light scattering method	Large measuring range, fast speed, high-precision data, good repeatability	The measurement results are related to particle size, color, and composition, and need to be calibrated.