Optical sensor mule aerosol particle sheath flow technology Application and Research
Details
Aerosol refers to a relatively stable dispersed system formed by solid or liquid particles suspended in a gas medium. At present, real-time monitoring technologies for aerosol particles mainly include elastic light scattering measurement technology and laser-induced intrinsic fluorescence technology. The former can be used to measure the concentration of aerosol particles, while the latter can further detect the concentration of biological particles in the air. Laser induced intrinsic fluorescence detection technology is a technology that has emerged in the past 20 years and has been widely studied and applied both domestically and internationally.
Aerosol detection Aerosol monitoring instruments developed based on elastic light scattering measurement technology have become very mature both domestically and internationally, including various types of optical dust particle counters, laser dust meters, etc. Shanghai Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, began to carry out research on optical dust particle counting technology in the 1990s, and successfully developed an optical particle counter that can be used to measure the cleanliness of clean rooms.
However, in environments with high concentrations of particulate matter, such as filter media testing stations and high dust concentration workplaces, the aerosol particle detection performance of ordinary nozzles is poor and their lifespan is short. This is mainly because when the particle concentration is too high, dust particles in the air will overlap in the photosensitive area, resulting in missed counting. In addition, the air entering the optical instrument cavity can contaminate the internal optical components, affecting measurement accuracy. To solve this problem, a gas sheath flow device can be used to effectively reduce overlap while protecting the cavity and optical components from contamination.
Sheath flow technology
Sheath flow technology was first applied to liquid media such as flow cytometry. Despite successful applications of sheath flow technology on liquid materials in China, there is almost no research on gas sheath flow devices. We conducted research on the application of gas sheath flow apparatus in aerosol particle optical sensors. By theoretically calculating the various parameters of the gas sheath flow device and using professional software to simulate and optimize the parameters, we have made a physical object and proposed a new experimental plan to verify the performance of the sheath flow device. This study provides a foundation for more accurate measurement of aerosol optical sensors in high concentration environments in China. In this optical sensor, particles pass through the photosensitive area with the airflow, and the laterally scattered light is collected by a curved mirror and then converged into a photomultiplier tube through a series of lens groups. Whenever a particle passes through the photosensitive area, a light pulse signal is generated. The larger the particle, the stronger the scattering, and the resulting light pulse signal will also be stronger. By measuring the number and intensity of light pulses, the concentration and size of aerosol particles can be calculated.
Gas sheath flow sensors are used to improve the performance of aerosol particle optical sensors. A gas sheath flow device is a device used to control the flow of particles, which can disperse aerosol particles in the gas sheath flow, effectively reducing overlap and improving measurement accuracy. In addition, gas sheath flow devices can also protect optical instruments from contamination and extend their service life.
Regarding radium caution
Shanghai Lasensor Photoelectric Technology Co., Ltd. is a research achievement of the Shanghai Institute of Optics and Fine Mechanics team, incubated by the Zhongke Shenguang Industrial Park in Jiading, Shanghai in 2017. The company is committed to researching and producing accurate, efficient, and real-time measurement methods and diagnostic instruments based on laser detection technology. At present, it is one of the few manufacturers in the world that can provide a complete set of 0.1 micron particle size particle counters, which can rival the counting efficiency of international high-level particle counters and comply with the ISO21501-4 standard. Shanghai Lasensor also provide inline air particle counter, real-time particle counter etc. We will provide excellent cost-effectiveness, excellent service, and flexible customization services.