Particulate matter concentration detection device
A technology for particle concentration and detection device, which is applied in measurement devices, particle suspension analysis, suspension and porous material analysis, etc. It can solve the problems of dust deposition, low accuracy, and cumbersome devices, so as to overcome large background noise and reduce deposition. The probability of , the effect of reducing the contact area
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Embodiment 1
[0048] Please refer to figure 1 , the present embodiment provides a particle concentration detection device, the particle concentration detection device includes a housing 1, a laser emitting device 2, a photoelectric conversion device 3, a sheath flow channel 4, a circuit board 5, a laminar flow sheet 6 and a guide flow plate7.
[0049] The housing 1 includes an air inlet 11, an air outlet 12, and an air flow passage 13 defined by the housing 1, and the air flow passage 13 is used to guide the measured air flow from the air inlet 11 of the particle concentration detection device to the Air outlet 12.
[0050] The laser emitting device 2 is used to emit laser light to irradiate the particles in the measured air flow and generate scattered light. The laser emitting device 2 is arranged inside the housing 1 and is located on one side of the air flow channel 13. The laser emitting device 2 The laser emitting direction of the device 2 is perpendicular to the extending direction ...
Embodiment 2
[0072] Please refer to Figure 7 with Figure 8 , this embodiment provides a particle concentration detection device, the difference between the particle concentration detection device and the particle concentration detection device disclosed in Embodiment 1 is that the structure of the deflector 7 is different.
[0073]In this embodiment, a certain distance is maintained between the deflector 7 and the laminar flow sheet 6 without communication. The deflector 7 is arranged in the air flow channel 13 and runs along the The direction of the airflow flow extends obliquely upwards toward the air intake surface 16a of the air-avoiding hole 15a, so as to guide the measured airflow to flow upwards, and then guide the measured airflow to flow from the upper side of the laminar flow sheet 6, while most of the clean air will flow from the upper side of the laminar flow sheet 6. The lower side of the laminar flow sheet 6 flows through, and the laminar flow sheet 6 realizes the function...
Embodiment 3
[0076] Please refer to Figure 9 with Figure 10 , this embodiment provides a particle concentration detection device, the difference between the particle concentration detection device and the particle concentration detection device disclosed in Embodiment 1 is that the structures of the laminar flow sheet 6 and the deflector 7 are different.
[0077] In this embodiment, a certain distance is maintained between the deflector 7 and the laminar flow sheet 6 without communication. The laminar flow sheet 6 is a spaced apart and symmetrically arranged on both sides of the avoidance hole 15b. For the laminar flow plate 6, the lighting channel is the interval in the middle of the laminar flow plate.
[0078] The deflector 7 is arranged in the air flow passage 13, and extends obliquely upward from the bottom of the lower housing 14 along the direction of the air flow to the air intake surface 16a of the avoidance hole 15a so as to guide the measured air flow upwards, and then Guide...
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