Research And Application Of Laser Dust Sensor

According to environmental problems caused by environmental organizations and governments attach great importance to the frequent haze of people's production and life have a greater impact,people are increasingly concerned about the air quality around the status quo in recent years.This paper bases on the Mie scattering theory,the relationship between the intensity of the scattered light and the negative refractive index,the particle size and the incident wavelength is analyzed in detail.According to the variation of the scattered light intensity of the particles with different particle size at 90 ° at the scattering angle,put forward a convenient environmental particulate matter concentration detection scheme,the hardware architecture proposed by the laser beam,photodiode,laser collimation system and a reasonable arrangement of the dark room to form a feasible structure distribution.In theoretical aspect,the scattered light energy distribution is studied by combining the classical Mie scattering with a certain light intensity,and collimating the light to a single isotropic spherical particle.This paper analyzes and presents a photodiode voltage signal with a scattering angle of 90 degrees at 20 mm below the detection chamber.The signal analysis,amplification,processing and calibration are analyzed in detail.A new scheme is proposed to detect the air dust concentration according to Mie theory.A new type of fire warning system based on laser dust concentration sensor is designed based on the sensitivity and data output characteristics of the new laser dust sensor,which is based on the current situation of fire accidents,the mainstream fire alarm device for smoke alarm and temperature alarm.According to the current environmental quality is increasingly concerned about the people,as a living with people,learning,work closely related to the environment,its environmental quality directly affect people's health and morbidity.Based on this,an indoor environment quality monitoring system based on multi-sensor data fusion is designed.Fire alarm system to STM32F107 as the system control center,through the PMS3003 dust concentration sensor on the A class fire to improve the system early warning function,and DS18B20 temperature sensor to assist the system early warning.Environmental quality testing uses laser dust concentration sensor combined with formaldehyde sensor,carbon monoxide sensor,temperature and humidity sensors using the index evaluation method to assess the quality of the environment can be stable and efficient monitoring of indoor environmental quality,through data to guide people to improve the indoor environment,to maintain good health,Work efficiency is of great significance.