CN203606258U

CN203606258U - Simple tester for particulate matter (PM)2.5 content in air

Info

Publication number: CN203606258U
Application number: CN201320850857.3U
Authority: CN
Inventors: 褚珊珊
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-12-23
Filing date: 2013-12-23
Publication date: 2014-05-21
Anticipated expiration: 2023-12-23

Abstract

The utility model discloses a simple tester for particulate matter (PM)2.5 content in air. The simple tester comprises a power supply, a switch, a protective resistor, a light source, a PM2.5 sensor, a test device and an air collecting tank, wherein the first end of the power supply is connected with the first end of the light source; the second end of the power supply is connected with the first end of the switch; the second end of the switch is connected with the protective resistor; the second end of the light source is simultaneously connected with the first end of the test device and the first end of the PM2.5 sensor; the second end of the protective resistor is simultaneously connected with the second end of the PM2.5 sensor and the second end of the test device; the light source and the PM2.5 sensor are arranged inside the air collecting tank. Compared with prior art, the peculiarity of the simple tester is a simple circuit structure, the same accuracy grade of monitoring numerical values are obtained by adopting equipment with low cost, and the simple tester helps people directly, simply and conveniently measure accurate data in daily life, simultaneously can automatically alarm or prompt people to pay attention to doing health prevention work when the PM2.5 content exceeds the standard, and has promotion and application value.

Description

Air PM2.5 content easily-testing instrument

Technical field

The utility model relates to a kind of air PM2.5 content detection device, relates in particular to a kind of air PM2.5 content easily-testing instrument.

Background technology

In recent years, along with domestic and international air pollution situation aggravation, there are the weather conditions such as haze in various places, people are more and more concerned about air quality situation every day frequently, wishes that the content of the thing such as PM2.5 by understanding every day helps judge whether to carry the health protection equipment etc. of going out.Up to the present, most of mechanism that PM2.5 is studied and monitored adopts to collect air sample both at home and abroad, subsequently by the luminous irradiation air sample of LASER Light Source, receive remaining direct light after PM2.5 refraction in air by corresponding optical sensor subsequently, judge the content of PM2.5 by collecting the power of light.But the air sample that each research institution or unit are collected does not have clear and definite standard, and the LASER Light Source adopting is also different, therefore the PM2.5 getting thus also has different containing numerical quantity in corresponding scope.And it is generally larger to purchase in the market available air PM2.5 content detection instrument volume, be difficult to operation and carry, be not easy to daily life and use.For above each problem, various countries propose to wish can unify in the world to formulate a research approach and standard in each overall situation and detection meeting on the one hand, help the correct airborne PM2.5 content of demarcating, just making great efforts on the other hand to improve self accuracy of detection, by controlling width and the photosensitive device accepting method of laser beam, improve during photosensitive and accept sensing capability, thereby finally obtain more accurate numerical value.And, the PM2.5 content measuring instrument of domestic and international existing specialty at present, prevailing price costliness, principle of work complexity, equipment is to certain condition of work requirement, and volume is larger, is not suitable for using in daily life at ordinary times.

Utility model content

The purpose of this utility model is just to provide in order to address the above problem a kind of air PM2.5 content easily-testing instrument.

The utility model is achieved through the following technical solutions above-mentioned purpose:

The utility model comprises power supply, switch, protective resistance, light source, PM2.5 sensor, proving installation and air trapping tank, the first end of described power supply is connected with the first end of described light source, the second end of described power supply is connected with the first end of described switch, the second end of described switch is connected with described protective resistance, the second end of described light source is connected with the first end of described proving installation and the first end of described PM2.5 sensor simultaneously, the second end of described protective resistance is connected with the second end of described PM2.5 sensor and the second end of described proving installation simultaneously, described light source and described PM2.5 sensor are all placed in described air trapping tank.

The beneficial effects of the utility model are:

The utility model is a kind of air PM2.5 content easily-testing instrument, compared with prior art, uniqueness of the present utility model is that circuit structure is simple, adopt lower-cost equipment to obtain the monitoring numerical value of same accuracy grade, help people directly to measure simply and easily in daily life data comparatively accurately, meanwhile, can automatic alarm in the time of PM2.5 content overproof or prompting people note carrying out self healthy prevention work, there is the value of promoting the use of.

Accompanying drawing explanation

Fig. 1 is circuit structure theory diagram of the present utility model;

Fig. 2 is the circuit structure schematic diagram of proving installation described in Fig. 1.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described in further detail:

As shown in Figure 1: comprise power supply, switch, protective resistance, light source, PM2.5 sensor, proving installation and air trapping tank; the first end of power supply is connected with the first end of light source; the second end of power supply is connected with the first end of switch; the second end of switch is connected with protective resistance; the second end of light source is connected with the first end of proving installation and the first end of PM2.5 sensor simultaneously; the second end of protective resistance is connected with the second end of PM2.5 sensor and the second end of proving installation simultaneously, and light source and PM2.5 sensor are all placed in air trapping tank.

As depicted in figs. 1 and 2:

Proving installation shows numerical value and corresponding air quality level at Liquid Crystal Module, can carry out air quality alarm by screen output information if desired.If need further to analyze data, can change single-chip microcomputer and Liquid Crystal Module into test circuit based on PC operation in test circuit part, make it to be connected with computing machine, obtain chart etc. with corresponding software analysis numerical value, the technology path of whole research be first determine suitable detection principle replace existing with laser as light source and accept the detection principle of laser, again by inspection information or look for relevant authoritative department or mechanism determines rational demarcation mode, finally utilize the electronic devices and components such as single-chip microcomputer to make in kind, material object is debugged and packed, finally complete whole test.

The detection method of fine particle (pm2.5) and pm10: light scattering, β ray and micro weight balance principle.

Scattering measuring principle:

When on the particle that irradiation suspends in air, produce scattered light.Under the certain condition of particle character, the scattered light intensity of particle is directly proportional to its mass concentration.By measuring scattered light intensity, application quality concentration conversion coefficient K value, tries to achieve particle quality concentration.

Concentration computing formula: C=(R-B) K

In formula: C mass concentration value mg/m3; R apparatus measures value, counting/point (CPM); B instrument substrate value, counting/point (CPM); K mass concentration conversion coefficient mg/m3 is multiplied by CPM mass concentration conversion coefficient K.

Claims

1. an air PM2.5 content easily-testing instrument, it is characterized in that: comprise power supply, switch, protective resistance, light source, PM2.5 sensor, proving installation and air trapping tank, the first end of described power supply is connected with the first end of described light source, the second end of described power supply is connected with the first end of described switch, the second end of described switch is connected with described protective resistance, the second end of described light source is connected with the first end of described proving installation and the first end of described PM2.5 sensor simultaneously, the second end of described protective resistance is connected with the second end of described PM2.5 sensor and the second end of described proving installation simultaneously, described light source and described PM2.5 sensor are all placed in described air trapping tank.