Dual-optical-path laser forward scattering particulate matter concentration measuring device

Abstract

The invention discloses a dual-light-path laser forward scattering particulate matter concentration measuring device, and belongs to the technical field of particulate matter concentration measurement. A dual-optical-path laser forward scattering particulate matter concentration measuring device comprises a measuring probe rod, an electrical unit box and a receiving box, the electrical unit box and the receiving box are arranged at the two ends of the measuring probe rod, the receiving box and the measuring probe rod are connected through an optical fiber tube, and the outer wall of the electrical unit box and the outer wall of the receiving box are each provided with a first walking assembly and a second walking assembly; through the blowing mechanism, communication between the measuring device and the water vapor environment in the flue is conveniently isolated, the measuring device is relatively sealed, internal corrosion is avoided, the service life of the device is prolonged, heat is diffused to a to-be-measured area through the blowing mechanism, the influence of water vapor on laser measurement is avoided, the measurement accuracy is improved, and the measurement efficiency is improved. And the device is moved in the flue through the walking assembly, so that the device can check the concentration of particulate matters in different areas, and the measurement precision is further improved.

Description

technical field [0001] The invention relates to the technical field of particle concentration measurement, in particular to a dual optical path laser forward scattering particle concentration measurement device. Background technique [0002] Most of the commonly used on-line monitoring equipment for particle concentration in the market is based on the principle of laser scattering. The principle is to inject laser light into the flue, and the beam will scatter with the particles in the flue gas. The intensity of the scattered light is proportional to the scattering cross section. When the particles rise When it is high, the cross-section of the scattered light of the particles increases, and the scattered light is enhanced, and the concentration of the particles can be further measured through the intensity of the scattered light. [0003] In the prior art, the invention patent with the patent application number CN201811562577.6 discloses "a dual optical path laser forward s...

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Problems solved by technology

[0003] In the prior art, the invention patent with the patent application number CN201811562577.6 discloses "a dual optical path laser forward scattering particle concentration measurement device, including an electrical unit box, a measuring probe and a receiving box. The electrical unit box is equipped with Laser transmitter and laser processor; the invention uses dual optical path forward scattering to measure the concentration of particulate matter, and has calibration optical path calibration to improve the accuracy of the measurement results", but there are still defects. In the actual use process, in the ultra-low emission industry Under normal circumstances, the measurement is affected by the environmental factors of the flue such as water vapor, which may easily cause inaccurate measurement, and the light transmission hole and light receiving hole for the laser to pass through the device make the measurement probe rod and the inside of the receiving box in contact with the flue gas. The channel environment is connected to each other, and water vapor can easily enter the device through the light hole, which will corrode the device and affect the service life of the device. Poor sex

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