CN104422641A - Gas particulate matter measurement instrument - Google Patents
Gas particulate matter measurement instrument Download PDFInfo
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- CN104422641A CN104422641A CN201310404393.8A CN201310404393A CN104422641A CN 104422641 A CN104422641 A CN 104422641A CN 201310404393 A CN201310404393 A CN 201310404393A CN 104422641 A CN104422641 A CN 104422641A
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- filter membrane
- gas
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- light
- extinction
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Abstract
The invention relates to a gas particulate matter measurement instrument. A reflective filter membrane with the relatively high reflectivity and a light absorption filter membrane with the relatively low reflectivity are used for filtering particulate matters in gas, a light source is used for irradiating the reflective filter membrane and the light absorption filter membrane, the intensity of light reflected by the reflective filter membrane is reduced along with the increased precipitation of the particulate matters, the intensity of light reflected by the light absorption filter membrane is increased along with the increased precipitation of the particulate matters, and the variations of the intensity of the light reflected by the reflective filter membrane and the light absorption filter membrane are respectively measured by utilizing a photovoltaic detection and data processing device, so that the content of the particulate matters in the gas can be calculated. By adopting the method, the weighing of the filter membranes is not needed, a strip-shaped filter membrane and a filter membrane conveying device also can be adopted to intermittently convey the filter membranes so as to realize the automatic measurement for multiple times in a long time. Moreover, compared with a traditional method for measuring the particulate matters in the gas in a light scattering way, the measurement precision is relatively high. Since the device considers the reflection and the absorption of the particulate matters in the gas on the light, the influence caused by the reflectivity of the particulate matters can be avoided.
Description
Art
The present invention relates to a kind of can the particle measuring instrument of particle content in measurement gas fast and automatically, can be applied to and need to carry out the various occasions that in gas, particle content is measured.
Background technology
At present, in existing gas, particle surveying instrument roughly has three kinds, one utilizes particle in membrane filtration gas, then particle content in gas is drawn according to filtering the front and back gas volume with flowing through filter membrane of poor quality, the method precision is higher, but measurement complex operation, automaticity is low; Two is utilize the scattering of particle to light in gas to measure, and the method automaticity is high, but precision is low; Three is utilize white reflection filter membrane to collect particle in gas to be measured, the change passing through the reflectivity measuring white reflection filter membrane again and the volumescope flowing through filter membrane calculate particle content, the method automaticity is high, precision is higher, but need the reflection characteristic obtaining particle in gas in advance, otherwise comparatively big error will be occurred.
Summary of the invention
In order to improve gas particles thing measuring accuracy and automaticity, the invention provides particulate matter measuring apparatus in a kind of gas, particle in the reflective filter membrane higher with reflectivity and the lower extinction membrane filtration gas of reflectivity, utilize the reflective filter membrane of light source irradiation and extinction filter membrane, the reflective light intensity of reflective filter membrane reduces along with the deposition increase of particle, the reflective light intensity of extinction filter membrane increases along with the deposition increase of particle, photodetection and data processing equipment is utilized to measure the reflective light intensity change of reflective filter membrane and extinction filter membrane respectively, thus calculate particle content in gas.Adopting the method without the need to weighing to filter membrane, banded filter membrane and filter membrane conveying device can also be adopted, intermittent delivery filter membrane thus realize long-time repeatedly automatic measurement.Further, compare with particle method in scattering method measurement gas, there is higher measuring accuracy.Because this device considers the reflection to light and the absorption of particle in gas, the impact of particle reflectivity therefore can not be subject to.
The technical solution adopted for the present invention to solve the technical problems is: adopt the filter membrane pedestal with air hole, reflective filter membrane, extinction filter membrane, aspiration pump and flow measurement device, light source, photodetection and data processing equipment are formed, wherein reflective filter membrane and extinction filter membrane cover tightly on the air hole of filter membrane pedestal, the air hole of filter membrane pedestal is connected with aspiration pump and flow measurement device, the light that light source sends can be irradiated on reflective filter membrane and extinction filter membrane, photodetection and data processing equipment can detect the light intensity value of reflective filter membrane and the reflection of extinction filter membrane and carry out data processing.Aspiration pump and flow measurement device is utilized to extract the gas to be measured of known volume through reflective filter membrane and extinction filter membrane, use the reflective filter membrane of light source irradiation and extinction filter membrane, the intensity variation numerical value of the reflective filter membrane obtained respectively by photoelectric sensor and the reflection of extinction filter membrane, in conjunction with the volume of gas flowing through filter membrane, calculate the content of particle in tested gas.
The invention has the beneficial effects as follows, structure is simple, and measuring accuracy is high, can realize the automatic measurement of particle in gas.
Accompanying drawing explanation
Below in conjunction with drawings and embodiments, the present invention is further described.
1. aspiration pumps and flow measurement device in figure; 2. filter membrane pedestal; 3. reflective filter membrane; 4. light source; 5. photodetection and data processing equipment; 6. extinction filter membrane.
Embodiment
In FIG, reflective filter membrane 3 and extinction filter membrane 6 are arranged on the air hole of filter membrane pedestal 2 respectively, the reflective filter membrane 3 and extinction filter membrane 4 homonymy certain distance of filter membrane pedestal 2 are provided with light source 4 and photodetection and data processing equipment 5, wherein light source 4 can be launched light wave and is irradiated on extinction filter membrane 3 and reflective filter membrane 6, and photodetection and data processing equipment 5 can be collected respectively and detect Optical power values that reflective filter membrane 3 and extinction filter membrane 6 reflect and by carrying out data processing.Aspiration pump and flow measurement device 1 is utilized to make the tested gas of known volume flow through reflective filter membrane 3 and extinction filter membrane 6 respectively, particle in tested gas can be deposited on reflective filter membrane 3 and extinction filter membrane 6, and on reflective filter membrane 3 and extinction filter membrane 6 particle of deposition amount and flow through this filter membrane gas volume to be measured more and in gas to be measured the content of particle be directly proportional.Because particle has certain reflectivity and absorptivity, the light part that light source 4 is irradiated on reflective filter membrane 3 is absorbed, a part is reflected in addition, because reflective filter membrane 3 has the reflectivity than particle object height, therefore on reflective filter membrane 3, the particle of deposition is more, the light intensity then reflected back lower (if particle reflectivity is equal with reflective filter membrane 3, then reflective light intensity is constant); In like manner because extinction filter membrane 6 has the reflectivity lower than particle, therefore on extinction filter membrane 6, the particle of deposition is more, then the light intensity be reflected back higher (if particle reflectivity equals extinction filter membrane, then reflective light intensity is constant).The numerical value of the reflection strength reduction that reflective filter membrane 3 is caused by the extinction characteristic of particle can be obtained respectively by photodetection and data processing equipment 5, and the Optical power values that extinction filter membrane 6 is increased by the reflection of particle.By processing the volume of the gas to be measured that reflective filter membrane 3 and extinction filter membrane 6 pass through and the change numerical value of respective light intensity, the content of the particle of Arbitrary Reflection Properties just can be drawn.
Claims (4)
1. a gas particles substrate concentration measuring instrument, form by with the filter membrane pedestal of air hole, reflective filter membrane, extinction filter membrane, aspiration pump and flow measurement device, light source, photodetection and data processing equipment, it is characterized by: reflective filter membrane and extinction filter membrane cover tightly on the air hole of filter membrane pedestal, the air hole of filter membrane pedestal is connected with aspiration pump and flow measurement device, the light that light source sends can be irradiated on reflective filter membrane and extinction filter membrane, and photodetection and data processing equipment can detect the light intensity value of reflective filter membrane and the reflection of extinction filter membrane and carry out data processing.
2. reflective filter membrane according to claim 1, is characterized by filter membrane specific wavelength reflectivity being greater than to 90%.
3. extinction filter membrane according to claim 1, is characterized by filter membrane specific wavelength reflectivity being less than to 10%.
4. aspiration pump and flow measurement device according to claim 1, is characterized by and can bleed to the air hole of filter membrane pedestal and can measure the gas volume flowing through reflective filter membrane and extinction filter membrane respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310404393.8A CN104422641A (en) | 2013-09-02 | 2013-09-02 | Gas particulate matter measurement instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310404393.8A CN104422641A (en) | 2013-09-02 | 2013-09-02 | Gas particulate matter measurement instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104422641A true CN104422641A (en) | 2015-03-18 |
Family
ID=52972271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310404393.8A Pending CN104422641A (en) | 2013-09-02 | 2013-09-02 | Gas particulate matter measurement instrument |
Country Status (1)
| Country | Link |
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| CN (1) | CN104422641A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106226209A (en) * | 2016-07-27 | 2016-12-14 | 广东美的制冷设备有限公司 | A kind of room air dust particle concentration detection method, system and household electrical appliance |
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| CN106226209A (en) * | 2016-07-27 | 2016-12-14 | 广东美的制冷设备有限公司 | A kind of room air dust particle concentration detection method, system and household electrical appliance |
| CN106226209B (en) * | 2016-07-27 | 2019-05-31 | 广东美的制冷设备有限公司 | A kind of room air dust particle concentration detection method, system and household electrical appliance |
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Application publication date: 20150318 |