Novel intelligent sensor for measuring dust concentration by using laser backscattering method

Abstract

The invention discloses a novel intelligent sensor for measuring dust concentration by using a laser backscattering method. A laser device is taken as a light source, the power source is output at constant light intensity through a microprocessor, light is emitted into a measured flue area at a certain slant angle of theta, the light scattered back by smoke dust is focused on a receiver through a focusing lens and then converted into electrical signals, a light filter is additionally provided for preventing the light from being interfered by other parasitic light, and after the signals are subjected to amplification and filtering processing through the microprocessor, the signals are converted into dust concentration. According to the invention, the stability and precision of the sensor are greatly increased, and the maintenance cost is reduced; and the sensor has the advantages of small volume, simple and reliable light path structure design, convenience in installation and maintenance, and the like.

Description

technical field [0001] The invention relates to a sensor, in particular to a novel intelligent sensor for measuring dust concentration by a laser backscattering method. Background technique [0002] The laser dust concentration intelligent sensor integrates the current relatively advanced optical-mechanical-electrical integrated intelligent sensor. It is an intelligent sensor that is guided by the latest contemporary optical technology, combined with mechanical automation and integrated microprocessor, and has the ability to collect and process small signals and exchange information. The laser backscattering method is used to quickly and accurately reflect the dust concentration through the light scattering intensity of dust. [0003] The laser dust concentration intelligent sensor is mainly used for the detection of dust concentration in the pollutants discharged from the flue of power plants, steel mills, cement plants, and petrochemical plants; the detection of atmosp...

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Problems solved by technology

[0004] At present, there are mainly two kinds of sensors at home and abroad that use optical methods to measure dust concentration: light transmission method and scattering method. The light transmission method has certain limitations. First, the installation requirements are relatively high. When installing on an industrial chimney, the transmitter and receiver must have holes. Enough coaxiality, otherwise the light intensity received by the receiving end will be affected, and external disturbances such as chimney vibration will seriously affect the measurement accuracy. Secondly, it is only suitable for detection in high-concentration dust environments. When the concentration is low, it cannot meet the accuracy requirements and cannot meet the current situation. The development is gradually replaced by the cooling method

The traditional scattering method dust concentration sensor has a large volume, complex optical path design, complex production process, high cost, and poor maintainability; due to the complex working environment of the dust concentration sensor, it is difficult for traditional sensors to effectively overcome the problem of lens pollution on the job site

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