A Small Spiral PM2.5 Concentration Detection Device Based on Total Reflection Prism

Abstract

The invention discloses a total-reflection-prism-based small-sized spiral PM2.5 concentration detecting device, and belongs to the field of automatic monitoring of environment. The device comprises a laser, a pinhole, a collimating object lens, a rectangular raster, an imaging object lens, an image sensor and a total reflection prism array, wherein a laser beam emitted from the laser passes through the pinhole to form a point light source; the point light source is collimated by the collimating object lens to form parallel light; the parallel light irradiates to the rectangular raster; the rectangular raster is imaged to the surface of the image sensor through the imaging object lens; light beams between the rectangular raster and the image sensor are turned into a spiral shape in an overlooking direction through the plane reflecting prism array; the laser is arranged to be oblique upwards; the total reflection prism array comprises four triangular prisms of which the cross sections are isosceles right triangles; one right-angle side of each isosceles right triangle and the light beams are positioned in the same vertical surface; the other right-angle side of each isosceles right triangle is perpendicular to the light beams. According to the total-reflection-prism-based small-sized spiral PM2.5 concentration detecting device, the instrument cost can be reduced, the calculation amount can be reduced, the monitoring real-time performance can be improved, and meanwhile, the miniaturization design of the detecting device can be realized.

Description

technical field [0001] A small-sized spiral PM2.5 concentration detection device based on a total reflection prism belongs to the field of environmental automatic monitoring, and specifically relates to a PM2.5 concentration detection device. Background technique [0002] Haze is directly related to PM2.5 particulate matter. By detecting the concentration of PM2.5, the haze weather can be quantitatively evaluated. [0003] The traditional PM2.5 detection method is to distribute smog monitors in different locations. This method has higher accuracy, but due to the complexity of the smog monitor equipment and high technical content, the detection cost also increases accordingly. [0004] Studies have shown that the concentration of PM2.5 has a linear relationship with the air visibility, so the concentration of PM2.5 can be obtained through the air visibility evaluation function. The invention patent with the application number of 201410200873 "PM2.5 Concentration Detector Bas...

AI Technical Summary

Problems solved by technology

[0005] This method can give the technical enlightenment of using images to monitor PM2.5 in the field. However, its disadvantages are: due to the use of no reference images, multiple targets and laser rangefinders are required, not only the detection cost is high, but also the test The steps are cumbersome, the amount of calculation is large, and the real-time performance is not ideal; in addition, due to the long distance between the target and the image sensor, the miniaturization design of the instrument cannot be realized

Images