Dust measuring instrument sensor

Abstract

The invention overcomes defects in the prior art and provides a dust measuring instrument sensor which is high in measuring precision and sensitivity and good in stability. According to the technical scheme to realize the technical effects, the dust measuring instrument sensor comprises an electric appliance box and an optical fiber coupler, wherein a circuit board is arranged in the electric appliance box, a photodiode is arranged on the circuit board, a full scale calibration block is arranged on the outer side of the electric appliance box, and a laser channel is formed in an end part of the full scale calibration block and connected with the optical fiber coupler through a gas pipe and an optical fiber channel. The dust measuring instrument sensor can be widely applied to the field of dust measurement.

Description

technical field [0001] The sensor for a dust measuring instrument of the invention belongs to the technical field of dust measurement. Background technique [0002] Conventional laser backscattering soot meter is a commonly used smoke detection instrument. The measurement principle of conventional laser backscattering soot meter is to use infrared laser as the emission light source. When the laser is irradiated on the dust, light scattering occurs. Under the condition of certain optical system and dust properties, the scattered light intensity is proportional to the dust concentration, and then the measurement is completed after calculation. [0003] From the perspective of engineering practice, when the concentration of smoke and dust emission is high (greater than 50mg / m 3 ), is a better choice. But for domestic 30mg / m 3 Below, even 5mg / m 3 The technical requirements for dust emission, as an online dust measurement device, are far from meeting the technical requirement...

AI Technical Summary

Problems solved by technology

[0004] (1) The particle size and concentration of the dust have dropped a lot simultaneously, so the chances of laser reflection and refraction have dropped a lot, and there are phenomena such as failure to measure, no reflected light signal, etc.

[0005] (2) The water content of the flue gas increases, which generally accounts for more than 10%, or even higher. When the laser is irradiated on the micro-water droplets, reflection and refraction will occur, so the interference factors of water are large, resulting in inaccurate measurement

[0006] The current commonly used in-situ backscattering instrument has low measurement accuracy, poor stability, and low sensitivity. The humidity of the flue gas has a great influence on the measurement results, and it is difficult to measure in the low range.

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