Mining laser dust concentration sensor based on light scattering principle

Coal is a pillar industry in the development of China’s national economy. When it comes to coal mine killers, words such as “gas explosion”, “water penetration” and “collapse” will most likely come to everyone’s mind. In fact, behind these disasters there is also a very scary “” Killer” – dust.
Coal will produce a large amount of dust during the mining, transportation and production process. Excessive dust concentration will lead to potential explosions, especially dust explosions caused by gas explosions. The increase in dust concentration endangers the health of coal mine production personnel, from safety From a production perspective, the coal mine environment must monitor and prevent dust, and strictly control production safety. At present, dust monitoring instruments include dust samplers, dust meters, dust concentration sensors , etc.
In order to meet the requirements of existing coal mines for monitoring underground dust concentration, the principle of laser scattering is used ( scattering of light refers to the phenomenon that part of the light deviates from the original direction when the light passes through an inhomogeneous medium. The light that deviates from the original direction is called scattered light. ) The developed high-tech sensor can monitor and display the underground dust concentration in real time, on-site and continuously under natural wind flow conditions, and at the same time output the switching signal of the dust reduction device with water spray, achieving the best effect of dust measurement and dust reduction.
Laser dust sensor dust sensor PM2.5 – DL0001 is a digital universal particle concentration sensor based on the principle of laser scattering, which can detect the concentration of suspended particles (including PM2.5) of different particle sizes in the air. The sensor uses a laser diode as a light source, irradiates suspended particles in the air to cause scattering, and uses a photodetector to collect the scattered light. The collected scattered light generates a current signal due to the photoelectric effect. After amplification and processing by the circuit , the concentration value of the particulate matter can be obtained. Then the scattered light collected by the microprocessor generates a current signal due to the photoelectric effect based on the Mie. After amplification and processing by the circuit, the concentration value of the particulate matter can be obtained, and then converted into a mass concentration (μg/m3) through an algorithm based on the MIE theory of the microprocessor, and output in the form of a universal digital interface.