Laser dust detection device for resisting dust deposition disturbance

Abstract

The invention discloses a laser dust detection device for resisting dust deposition disturbance, which comprises a laser and two detection dark rooms for detecting dust-containing gas. The two detection dark rooms are communicated with each other through an air current connecting pipeline. The detection device is characterized in that: light emitted from the laser is divided into two paths of light with the same light intensity, and then enters the two detection dark rooms through expanded beam lenses respectively; light emitted from the detection dark rooms is converged on respective multi-element optical fiber distribution plate through focusing lenses respectively; two photoelectric detectors receive the light intensities of the center and other parts of the multi-element optical fiber distribution plate respectively; the air current connecting pipeline is provided with a light insulation structure; and a dust deposition compensating glass is arranged in one of the detection dark rooms. The detection device has the advantages that: scattered light is separated from transmitted light by adopting a forward scattering detection method and appropriately arranging the focusing lenses and the multi-element optical fiber distribution plate, so that the detection accuracy is improved; and the dust deposition degree can be detected in real time and the effect of dust deposition is reduced by skillfully using the dust deposition compensating glass.

Description

technical field [0001] The invention relates to a laser dust detection device, in particular to a laser dust detection device which is anti-dust interference. Background technique [0002] At present, there are many methods for detecting dust concentration in the environment at home and abroad, including sampling method, weighing method, β-ray method, optical method, etc. The first three methods are generally complicated in equipment and large in size, which is not conducive to online measurement, while optical Scattering method and transmission method are used in the method, which are widely used due to the advantages of laser light source, for example (such as domestically produced LD-5C microcomputer laser dust meter, AIM-2000 laser dust concentration meter, JFC-1 laser dust concentration meter ), these instruments have automatic continuous sampling because they can be measured online, the data is representative, and the anti-interference ability is strong. [0003] Chin...

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Problems solved by technology

Chinese patents 200620000174.9 and 200420047907.5 disclose laser dust concentration measurement devices. The light intensity detected at the photoelectric detection end actually includes transmitted light and scattered light components, so the measurement accuracy is bound to be affected; the laser dust meter disclosed in Chinese patent 02235130.2 Set a concave light absorption groove at the center of the convex lens relative to the light source, eliminating the influence of transmitted light on the measurement accuracy, but it cannot ensure the elimination of the influence of dust accumulation on the optical path window

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