Abstract
Respirable particulate matter air pollution is positively associated with SARS-CoV-2 mortality. Real-time and accurate monitoring of particle concentration changes is the first step to prevent and control air pollution from inhalable particles. In this research, a new light scattering instrument has been developed to detect the mass concentration of inhalable particles. This instrument couples the forward small-angle single particle counting method with the lateral group particle photometry method in a single device. The mass concentration of four sizes of inhalable particles in the environment can be detected simultaneously in a large area in real-time without using a particle impactor. Different from the traditional light scattering instrument, this new optical instrument can detect darker particles with strong light absorption, and the measurement results mainly depend on the particle size and ignore the properties of the particles. Comparative experiments have shown that the instrument can detect particles with different properties by simply calibrating the environmental density parameters, and the measurement results have good stability and accuracy.
Highlights
In atmospheric and air quality research, “PMX ” refers to particles with aerodynamic diameter less than or equal to x μm
The photometric signal is received at 45◦ for estimating the mass concentration of the 1 μm particles, and the single particle pulse signal is received at 20◦ for estimating the mass concentration of the particle size range larger than 1 μm
To test the performance of the forward small angle particle counting coupled with photometry in aerosol detection, a series of experiments were conducted, which includes a comparison with the standard light scattering instrument DustTrack 8530 through a simulated smoke box in the laboratory and a long-time comparison with the tapered element oscillating microbalance (TEOM) instrument
Summary
In atmospheric and air quality research, “PMX ” refers to particles with aerodynamic diameter less than or equal to x μm. Some relatively dark particles will be ignored, and only brighter particles will be considered, which will cause measurement deviation It has a strong dependence on the calibration of instrument parameters in different environments when using the traditional daylighting angle to detect particle mass concentration [21]. The combination of photometer and particle counter can complement the strengths and weaknesses of the two measurement methods It can obtain the particle mass concentration in different particle size range at the same time without the restriction of impactor cutter and has a high measurement concentration range. The stray light signals caused by the light source or air molecules are suppressed or eliminated by the opto-mechanical structure optimization design and the adaptive phase-cancellation filtering algorithm This instrument can detect the mass concentration of particles at different particle sizes in realtime by particle size segmentation, in a wide concentration range without using a particle impactor. The measurement results mainly depend on the particle size information and are insensitive to the change of particle properties
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
