Device for detecting mass concentration of high-precision particulate matters

Abstract

The invention provides a device for detecting the mass concentration of high-precision particulate matters. The device for detecting the mass concentration of the high-precision particulate matters comprises a laser emitting unit and a laser detecting unit, wherein the laser emitting unit comprises an optical lens; one surface of the optical lens is an optical axis axisymmetric aspheric surface which is used as an incident plane and is used for collimation, the other surface is a cylindrical surface, is used as an exit surface and is used for , and a laser light beam can be shaped into a linear light beam; on the one hand, the technical shortcomings that a focusing lens was adopted in the past, a laser light beam was focused into a spot light beam, energy distribution is uneven, and thus,measurement are inaccurate are overcome, measurement interference of particulate matters with different diameters is eliminated, and the particulate matters with different diameters are measured simultaneously; and on the other hand, the technical shortcomings that two optical lenses are used in the past, a certain distance existed between the lenses, and thus, a light path was debugged complicatedly are overcome, the structure is simplified, the light path debugging difficulty is reduced, and the manufacturing cost is saved; and an expensive air pump is not required, and the device is suitable for being popularized and used on a large scale.

Description

technical field [0001] The invention belongs to the technical field of air quality detection, and in particular relates to a high-precision particle mass concentration detection device. Background technique [0002] In recent years, smog has occurred frequently, and particulate matter in the atmospheric environment has received close attention at home and abroad. For a period of time, inhalable particulate matter PM 10 , PM 2.5 It is an important monitoring indicator in the atmospheric environment. Because the particles suspended in the air often adsorb some substances that have an important impact on people's health, such as bacteria, viruses, and harmful chemicals, these substances are small in size and slow in natural settlement. Through There is a high probability that the breath is directly inhaled and deposited in the alveoli, and the impact on human health cannot be ignored. [0003] The detection methods for particulate matter in the air include β-ray absorption me...

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Problems solved by technology

[0009] In order to solve the above technical defects, the present invention discloses a high-precision particle mass concentration detection device, which adopts a single-piece optical lens formed by precision injection molding of a mold to form a uniform linear beam, which overcomes the previous use of a focusing lens, and the laser beam is focused into a point beam , the technical defect of inaccurate measurement due to uneven energy distribution can realize simultaneous measurement of particles of different particle sizes; it overcomes the need for two optical lenses in the past, and there is a certain distance between the two optical lenses, which leads to complex installation and debugging of the optical path and high cost. It simplifies the optical path structure, reduces the difficulty of optical path debugging and manufacturing cost, does not require expensive air pumps, is suitable for mass promotion and application, and has broad market prospects

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