Dust concentration measuring device

Abstract

The invention relates to a dust concentration measuring device, which comprises a laser input unit, a dust concentration measuring unit and a laser output detecting unit, wherein the laser input unit comprises a laser device, input optical fiber, a beam splitter and an input collimator; the dust concentration measuring unit comprises a plurality of pairs of total reflection planes; the laser output detecting unit comprises an output collimator, an output optical fiber and a photoelectric detector; a laser which is emitted by the laser device and is transmitted to the beam splitter through the input optical fiber for beam splitting enters the dust concentration measuring unit through the input collimator; after being reflected by all pairs of total reflection planes, the laser is transmitted to the photoelectric detector by the output collimator via the output optical fiber; the distance between each pair of total reflection planes is not identical. A measuring optical field is reflected for multiple times by a total reflection plane mirror; the length of a measuring optical path is prolonged. A dual optical path difference measuring method is used; the problems of sensor system errors, mine optical device surface dustfall errors and the like are solved.

Description

technical field [0001] The invention relates to the field of concentration measurement, in particular to a dust concentration measurement device. Background technique [0002] The measurement methods of dust concentration mainly include optical analysis method and non-optical analysis method. The non-optical analysis method is difficult to monitor the dust concentration in real time due to the slow response speed of the detection equipment and complicated processing. For example, the existing chemical reaction type dust concentration sensor needs to collect and process air dust, which has a measurement delay difference and cannot perform real-time measurement. However, the safety of the electric dust concentration measuring device is poor. When the mine dust concentration is too high, a slight electric spark will cause the risk of mine explosion. [0003] The dust concentration measurement technology based on optical analysis has the characteristics of high detection sensi...

AI Technical Summary

Problems solved by technology

However, the existing hand-held dust concentration measurement devices must require the operator to measure on the spot, and in an environment with high dust concentration similar to coal mines, the operator must take dust-proof measures when measuring, otherwise it will damage the respiratory tract and affect health

In addition, since the measuring instrument is located in a high-dust area, after long-term use, dust must be deposited on the surface or inside the instrument, which will affect the measurement accuracy

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