Introduction to common technology of dust concentration detector
The dust concentration detector is a commonly used environmental detection instrument, which is suitable for the rapid determination of the concentration of inhalable particulate matter (PM10) in public places, and the detection of dust concentration in labor hygiene such as the production site of industrial and mining enterprises. The following small series mainly introduces the common techniques of the dust concentration detector, hoping to help users better apply the product.
Introduction to dust concentration detector
The measurement principle of the capacitance method is simple, but there is not a one-to-one linear relationship between the capacitance measurement value and the concentration. The measurement value of the capacitance is susceptible to the phase distribution and the flow pattern change, resulting in a large measurement error; although the B-ray method is measured Accurate, but need to measure the dust after the comparison, it is difficult to achieve online monitoring of dust concentration; ultrasonic method, microwave method to measure the dust concentration is still in the experimental research stage, there are fewer molded products on the market. At present, the light scattering method, the light absorption method and the triboelectric method are mainly used for online monitoring of dust concentration, and many products are formed, and successfully applied to dust concentration measurement and coal mine dust concentration measurement.
Common techniques for dust concentration detectors
Friction Static Technology: Insert a probe into the flue gas duct, which measures the change in charge carried by the particles to record their presence. Their accuracy and reliability are affected by the following: they can only measure dust that is colliding or very close to the probe.
Light opacity technology: Light transmission (more specifically, light absorption) is used as a means to measure particle density, and light absorption is measured by a narrow beam passing through a flue gas duct.
Light Scattering Technology: Light scattering technology uses the frequency and duration of the flash reflected from the particles in the gas stream to measure the particle content. It has an overwhelming advantage over other technologies in that it greatly reduces the error due to humidity in the gas stream. Reduced to an insignificant level.
Light absorption technology: When a light wave passes through a linear substance, it interacts with the substance. A part of the light wave is absorbed by the medium and converted into heat energy; part of it is scattered by the medium and deviates from the original direction of propagation, and the remaining part is still in the original direction of propagation. Through the medium. The Lambert-Beier law is consistent between the transmitted light intensity and the incident light intensity. The light absorption type dust concentration sensor is based on Lambert-Beer law. By measuring the incident light intensity and the outgoing light intensity, the dust concentration is calculated. The method has the characteristics of accurate measurement under high dust concentration.
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