Particulate matter mass concentration detector with self-purification system

A technology of mass concentration and particulate matter, which is applied in the direction of particle suspension analysis, measuring devices, scientific instruments, etc., can solve the problems of increasing the adsorption force of piezoelectric materials to dust particles and high cleanliness requirements

Inactive Publication Date: 2015-02-18
CATECH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, two problems have been highlighted in practical applications: one is the need to increase the adsorption force of piezoelectric materials on dust particles; the other is to regularly clean

Method used

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  • Particulate matter mass concentration detector with self-purification system
  • Particulate matter mass concentration detector with self-purification system
  • Particulate matter mass concentration detector with self-purification system

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Embodiment 1

[0052] Such as Figure 4-6 Shown is a typical embodiment of the present invention, and the specific structure mainly includes an air blowing pump 1, a HEPA pipe 2, a tee 3, an air inlet assembly 5 located at the air inlet, a cutting head 4, a laser diode assembly 6, and a photodetector Component 9, an air outlet component 8 located at the gas outlet, a laser reflection bevel component 10, an air pump 11, a photosensitive area 7 and corresponding mechanical pipelines, etc., wherein an air inlet component 5, a cutting head 4, a laser diode component 6, a photoelectric The detector assembly 9, the gas outlet assembly 8, the laser reflection bevel assembly 10, and the photosensitive area 7 together form a photoelectric sensing system. The sampling gas passes through the tee 3, the cutting head 4, the air inlet pipe of the air inlet assembly 5, the photosensitive area 7 and the air outlet pipe of the air outlet assembly 8 to form a sampling air path, which may also include a flow m...

Embodiment 2

[0058] The basic structure of this embodiment is similar to that of the embodiment, except that the photodetector is a forward light scattering structure relative to the sampling gas path, that is, the laser beam and the photodetector are on the same line. In order to better accept the scattered light, it also includes a light absorption groove and a convex lens group located in front of the photodetector. The laser main beam is absorbed through the light absorption groove, and the scattered light is collected through the convex lens group integrated in the photodetector.

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Abstract

The invention discloses a particulate matter mass concentration detector with a self-purification system, belonging to the technical field of environmental detection. The particulate matter mass concentration detector comprises a photoelectric sensing system, a signal acquiring and processing system and a self-purification system, wherein the photoelectric sensing system comprises a laser illumination system, a sampling gas path and a scattered light collecting system, and the scattered light collecting system is used for collecting scattered light in a photosensitive area, converting light signals into an electric signal and transmitting the electric signal to the signal acquiring and processing system; and the self-purification system is characterized in that an air blowing pump is communicated with the sampling gas path by virtue of an HEPA pipe. The particulate matter mass concentration detector disclosed by the invention mainly comprises a self-purification device so as to prevent dust particles left in the photoelectric sensing system from polluting an optical system to improve the working stability of the optical system and prolong the service life of the optical system; moreover, the detector can be used for calibrating and calculating the mass concentration of the dust particles which are collected in a normal working state.

Description

technical field [0001] The invention belongs to the technical field of environmental detection, and in particular relates to a particle mass concentration detector. Background technique [0002] Dust mass concentration refers to the mass of tiny particles per unit volume, usually in mg / m 3 or ug / m 3 express. The measurement methods of dust mass concentration are divided into sampling analysis method and induction direct measurement method. Sampling analysis methods mainly include: filter membrane weighing method; induction direct measurement method mainly includes: β-ray method, vibration balance method, piezoelectric crystal detection fee and light scattering method. [0003] Filter weighing method: [0004] The basic principle of the filter weighing method is: use a fixed flow rate air pump to draw the sample gas for a long time and let it pass through the filter membrane with a constant weight. The filter membrane can filter more than 95% of the dust particles with a ...

Claims

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Application Information

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IPC IPC(8): G01N15/06
Inventor 李苏安李浩
Owner CATECH TECH
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