PM2.5 detector and detection method thereof
A detection method and detector technology, which are used in measurement devices, scientific instruments, analysis of suspensions and porous materials, etc., can solve the problems of high cost, inconvenience and large volume, and achieve the effect of low cost and simple and convenient detection method.
Inactive Publication Date: 2015-06-10
上海垚智电子科技有限公司
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Problems solved by technology
However, the cost of industrial dust particle counters is very high, and it is not suitable for PM2.5 detection. It is bulky and not easy to carry
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[0032] Such as figure 1 As shown, the present invention provides a PM2.5 detector comprising:
[0033] The cavity, the cavity is divided into an air inlet channel 41, a detection channel 42 and an air outlet channel 43; the air intake channel 41, the detection channel 42 and the air outlet channel 43 are connected in sequence; the cross section of the detection channel 42 is a square hole;
[0034] The laser 1 is located in the air inlet channel 41 and is used to emit a laser beam 5 passing through the detection channel 42 and the air outlet channel 43;
[0035] The photodetector 2 is located in the detection channel 42 and is used to detect scattered light and convert the optical signal of the scattered light into an electrical signal. The scattered light means that the particles in the detection channel are irradiated by the laser beam, Scattering occurs, resulting in light;
[0036] And the fan 3 is located at the tail end of the air outlet channel 43 and is used to gener...
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The invention belongs to the field of domestic PM2.5 detection, particularly relates to a PM2.5 detector and a detection method thereof, aims at solving the problems that an existing PM2.5 detector is relatively large in detection error, and a traditional dust particle laser counter is high in cost and large in volume, and provides a PM2.5 detector. The PM2.5 detector comprises a cavity, a laser device, a photoelectric detector and a fan, wherein the cavity is divided into an air inlet channel, a detection channel and an air outlet channel; the laser device is arranged in the air inlet channel; the photoelectric detector is used for detecting a scattered light and converting a light signal of the scattered light into a current pulse signal; and the fan is located at the tail end of the air outlet channel and is used for generating airflow with preset flow rate. The detection method of the detector is simple and convenient; the PM2.5 detector provided by the invention is small in volume; the detection accuracy reaches 80%; the cost is relatively low; and the PM2.5 detector is convenient to be widely applied to handheld PM2.5 detection equipment.
Description
technical field [0001] The invention belongs to the field of household PM2.5 detection, and in particular relates to a PM2.5 detector and a detection method thereof. Background technique [0002] PM2.5 refers to the sum of particles with an equivalent diameter of less than 2.5 μm. The existing PM2.5 sensor separates PM2.5 particles from dust particles through a sampling device, and then measures the total amount of particles. However, due to the limitation of the sampling device The cost performance is very low, and the separation effect of the low-cost sampling device is not very ideal, with an error of more than 40%, which is not suitable for the low-cost and high-performance requirements in the field of household PM2.5 detection. [0003] The principle of dust particle laser counting is widely used in the field of industrial dust particle detection, but it has not been applied to household PM2.5 detection at present. However, the cost of industrial dust particle counters...
Claims
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Inventor 冯翠萍李书龙部海青于志民
Owner 上海垚智电子科技有限公司