CN104458520A - Dust sensor and space dust detection method - Google Patents
Dust sensor and space dust detection method Download PDFInfo
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- CN104458520A CN104458520A CN201410624841.XA CN201410624841A CN104458520A CN 104458520 A CN104458520 A CN 104458520A CN 201410624841 A CN201410624841 A CN 201410624841A CN 104458520 A CN104458520 A CN 104458520A
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Abstract
The invention relates to a dust sensor and a space dust detection method. The dust sensor comprises a shell, a circuit board close to the shell, an infrared lamp and a photoelectric receiving sensor arranged in the shell, a heater arranged at the bottom of the shell, and a convex lens which is close to the infrared lamp and the photoelectric receiving sensor, wherein an air outlet is formed in the top of the shell; an air inlet is formed in the bottom or middle of the shell; and the infrared lamp, the photoelectric receiving sensor and the heater are respectively connected to the circuit board. According to the dust sensor disclosed by the invention, an air extraction mechanism is not needed, and the dust measurement precision is high.
Description
Technical field
The present invention relates to sensor and dust detection method, especially the detection method of dust sensor and space dust.
Background technology
At present for the measurement of dust concentration, mainly contain following several mode: a kind of employing dust sampler, utilize the heavy method principle of filter membrane meter: the dust laden air extracting certain volume, dust is trapped on filter membrane, according to the dust quality that filter membrane increases, recycling formulae discovery goes out unit volume dust in air mass concentration.This mode is not only not easy to operation, and can not continuous coverage.One is dust measurement instrument of direct-reading type, mainly utilizes indirect method as principles such as light scattering, the absorptions of β source, utilizes sampling thief to demarcate, can the dust concentration value measured of instant playback come, but the working time is short, pendulous frequency is limited, measuring accuracy is inadequate, can only use as Conventional portable dust gauge.
If the patent No. is " CN 201010294093.5 ", patent name for the Chinese patent of " a kind of sensor of dust concentration " disclose " a kind of powder concn sensor; sampling unit, by sensor internal described in extraneous dust laden air suction, and through photoelectric conversion unit; Photoelectric conversion unit, provides a light source, irradiates the dust laden air of process, and produces scattered light, described scattered light is converted to voltage output signal, and exports described voltage signal to signal amplification unit; Signal amplification unit, is connected with semiconductor photodetector, the signal received is carried out process and amplifies and export; Processing unit, is connected with signal amplification unit, and the voltage signal exported based on signal amplification unit and the proportionate relationship of the voltage signal prestored and powder concn calculate powder concn ".Disclosed in this patent, sensor of dust concentration is rational in infrastructure, and Measurement sensibility is good, and sensitivity accuracy is high, easy care.But need by air extraction mechanism, it is too fast that extracting air causes air velocity, the collection difficulty of dust granules increases, the problem that acquisition precision reduces.
Summary of the invention
Object of the present invention, overcomes the deficiencies in the prior art exactly, provides one not need air extraction mechanism, the detection method of the dust sensor that dust measurement precision is high and space dust.
In order to achieve the above object, following technical scheme is adopted:
A kind of dust sensor, comprises housing, to fit the circuit board arranged, be arranged on the infrared lamp in housing, photoelectric receiving transducer, be located at the well heater of housing bottom with housing, and the convex lens pressing close to arrange with described infrared lamp, photoelectric receiving transducer respectively; Described case top is provided with gas outlet, and described housing bottom or middle part are provided with air intake opening, and described infrared lamp, photoelectric receiving transducer, well heater are connected to described circuit board respectively.
Further, described current output sensor is to circuit board, and described circuit board output pwm signal, described circuit board is provided with IIC serial ports.
Further, described infrared lamp and convex lens are located in a shading housing, and described shading housing is provided with an opening, and described opening is located at by described convex lens.
A detection method for space dust, comprises the following steps: the air in the housing of heating dust sensor, makes the air intake opening of housing central section or bottom and the exhausr port at top form cross-ventilation; Open infrared lamp, irradiate the air being positioned at middle part or bottom in housing; Open photoelectric receiving transducer, receive the diffuse light that infrared lamp irradiates dust in air particle, calculate the light intensity that photoelectric receiving transducer receives; Corresponding relation according to light intensity and dust concentration calculates dust concentration; Export dust concentration value.
Further, the dust concentration value of described output is pwm signal, and the corresponding relation of its low burst length and dust concentration is 1ms=0.7ug/m
3.
Further, the cycle of described output pwm signal is 4s, and the width of described low pulse is 1 ~ 3000ms.
Further, the mean value of the corresponding dust concentration of the low pulse width of described output pwm signal.
Further, the instant value of the corresponding dust concentration of the low pulse width of described output pwm signal.
Further, described output dust concentration value reads the dust concentration of dust sensor by IIC interface.
Further, the pwm signal of described output is that dust sensor output current transfers digital PWM signal pulse to after amplifying and correcting.
Compared with prior art, beneficial effect of the present invention is:
The present invention adds hot-air by the well heater being located at bottom, air is made under the principle of hot-air rising, cold air decline, to form convection current by air intake opening and gas outlet thus drive the dust in air to move, and then the concentration of air-borne dust is judged in the diffuse reflection utilizing light irradiation to produce, avoiding air draft mechanism extracting air, to cause air velocity too fast, the collection difficulty of dust granules increases, the problem that acquisition precision reduces.
Accompanying drawing explanation
Fig. 1 is the structure cut-open view of dust sensor of the present invention;
Fig. 2 is the flow chart of steps of the detection method of space dust of the present invention;
Fig. 3 is the periodic signal figure of pwm signal intensity of the present invention;
Fig. 4 is the graph of a relation of output pwm signal dutycycle and dust concentration.
Diagram: 1-housing; 11-gas outlet; 12-air intake opening;
2-infrared lamp; 3-photoelectric receiving transducer; 4-convex lens; 5-well heater; 6-circuit board.
Embodiment
Describe the present invention in detail below in conjunction with accompanying drawing and specific implementation method, be used for explaining the present invention in exemplary embodiment and description of the present invention, but not as a limitation of the invention.
The dust sensor of this enforcement comprises housing 1 and circuit board 2.Housing 1 is directly fixedly connected with circuit board, is provided with infrared lamp 2, photoelectric receiving transducer 3, well heater 5 and convex lens 4 in housing 1.The top of housing 1 is provided with gas outlet 11, and bottom it or middle part is provided with air intake opening 12.The position of air intake opening 12 is preferably arranged on the top of well heater 5, after air enters from air intake opening, and the homogeneous heating space heating that just can be formed by well heater.Infrared lamp 2, photoelectric receiving transducer 3, well heater 5 are connected to circuit board 6 respectively, and circuit board controls the opening and closing time of infrared lamp 2, photoelectric receiving transducer 3, well heater 5.
The measuring principle of the dust sensor of the present embodiment is:
According to the chromatic dispersion principle of light, infrared lamp 2 is launched light and is run into dust generation reflected light, and high-sensitive photoelectric receiving transducer 3 detects the light intensity of reflected light and outputs signal.The concentration of dust is judged according to the size of output signal light intensity.The output current of photoelectric receiving transducer 3 becomes corresponding ratio to the light intensity detected, photoelectric receiving transducer 3 output current is after amplifier amplifies, treated device correction process again, the pulse of final output digital PWM signal, or export dust concentration numerical value by IIC serial ports.Wherein, infrared lamp 2 is preferably infrarede emitting diode.
In the work of reality, the oblique irradiation of infrared lamp 2 is positioned at middle part or the air of bottom, and photoelectric receiving transducer 3 is also arranged on the top position of enclosure interior, and points to the air level that light post that infrared lamp 2 sends irradiates.In order to obtain the irreflexive light of dust in air more accurately, prevent the dust in air to the interference of photoelectric receiving transducer.Is got up by shading housing seal in space between photoelectric receiving transducer and convex lens.Shading housing is provided with an opening, and convex lens are arranged on this opening, the air level that the light post that this opening sensing infrared lamp 2 sends irradiates.
The dust sensor of the present embodiment is applicable to air purifier, is with the supporting of the air-conditioning of purification function, VMC (Ventilation Mechanical Control System) and air quality detecting instrument.
The detection method of the space dust of the dust sensor of the present embodiment, comprises the following steps:
S10: the air in the housing of heating dust sensor, makes the air intake opening of housing central section or bottom and the exhausr port at top form cross-ventilation.
In the housing of opposing seal, add hot-air, air rises due to heat, and the principle of cold decline, the gas outlet to housing upper is got rid of.Now, air in housing reduces, and forms air pressure with outside atmosphere, and the effect from the middle part of housing or bottom by atmospheric pressure of the air of outside enters in housing.Enter air in housing due under the effect of well heater, move upward and discharge from gas outlet, forming the convection current of enclosure interior air.
S20: open infrared lamp, irradiates the air being positioned at middle part or bottom in housing.
After heater, just open infrared lamp.The lamppost of infrared lamp points to the air being positioned at middle part or bottom in housing.The air of preferred sensing air intake opening.Have dust in atmosphere, when Infrared is radiated at dust, dust can reflection ray.
S30: open photoelectric receiving transducer, receives the diffuse light that infrared lamp irradiates dust in air particle, calculates the light intensity that photoelectric receiving transducer receives.
Dust reflection ray enters into photoelectric receiving transducer by convex lens, and photoelectric receiving transducer then can calculate the light intensity of giving vent to anger and receiving.Dust reflection is more, and the concentration of dust is larger.
S40: the corresponding relation according to light intensity and dust concentration calculates dust concentration, exports dust concentration value.
The dust concentration value exported is pwm signal, and the corresponding relation of its low burst length and dust concentration is 1ms=1ug/m
3, be preferably 1ms=1ug/m
3.The pwm signal exported is that dust sensor output current transfers digital PWM signal pulse to after amplifying and correcting, and being digital quantity, by ceaselessly measuring, just can obtaining continuous print numerical value.
As shown in Figure 3, the cycle of described output pwm signal is 4s, and the width of described low pulse is 1 ~ 3000ms.Work as 1ms=1ug/m
3time, as shown in Figure 4, as can be seen from the graph of a relation of output duty cycle and dust concentration, along with the rising of dust concentration, the ratio of output duty cycle deviation average becomes large.In order to ensure the accuracy exported, by the period restrictions of pwm signal in certain reasonably scope, prevent in one-period, the ratio that the low burst length accounts for is excessive causes the measurement of dust concentration inaccurate.
The mean value of the corresponding dust concentration of low pulse width of output pwm signal, or the instant value of the corresponding dust concentration of the low pulse width of output pwm signal.When the mean value of the corresponding dust concentration of low pulse width of the pwm signal exported, the response speed of output is comparatively slow, but fluctuates little good stability.When the instant value of the corresponding dust concentration of low pulse width of the pwm signal exported, output speed is fast, but fluctuation is larger.Two kinds of different outputs adapt to different application scenarioss.
Preferably, exporting dust concentration value can also be read for external unit by IIC interface, and after reading, the dust concentration value of display is no longer simple grade, can also be continuous print numerical value.Such as existing is 1 grade, 2 grades, 3 grades, 4 grades.By continuous print concentration value 1 ~ 3000ug/m can be read after IIC interface
3.
Above the technical scheme that the embodiment of the present invention provides is described in detail, apply specific case herein to set forth the principle of the embodiment of the present invention and embodiment, the explanation of above embodiment is only applicable to the principle helping to understand the embodiment of the present invention; Meanwhile, for one of ordinary skill in the art, according to the embodiment of the present invention, embodiment and range of application all will change, and in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a dust sensor, is characterized in that, comprises housing, to fit the circuit board arranged with housing, be arranged on the infrared lamp in housing, photoelectric receiving transducer, be located at the well heater of housing bottom, and the convex lens pressing close to arrange with described infrared lamp, photoelectric receiving transducer respectively; Described case top is provided with gas outlet, and described housing bottom or middle part are provided with air intake opening, and described infrared lamp, photoelectric receiving transducer, well heater are connected to described circuit board respectively.
2. dust sensor according to claim 1, is characterized in that: described current output sensor is to circuit board, and described circuit board output pwm signal, described circuit board is provided with IIC serial ports.
3. dust sensor according to claim 1, is characterized in that: described infrared lamp and convex lens are located in a shading housing, and described shading housing is provided with an opening, and described opening is located at by described convex lens.
4. a detection method for space dust, is characterized in that, comprises the following steps:
Air in the housing of heating dust sensor, makes the air intake opening of housing central section or bottom and the exhausr port at top form cross-ventilation;
Open infrared lamp, irradiate the air being positioned at middle part or bottom in housing;
Open photoelectric receiving transducer, receive the diffuse light that infrared lamp irradiates dust in air particle, calculate the light intensity that photoelectric receiving transducer receives;
Corresponding relation according to light intensity and dust concentration calculates dust concentration, exports dust concentration value.
5. the detection method of space dust according to claim 4, it is characterized in that, the dust concentration value of described output is pwm signal, and the corresponding relation of its low burst length and dust concentration is 1ms=1ug/m
3.
6. the detection method of space dust according to claim 5, it is characterized in that, the cycle of described output pwm signal is 4s, and the width of described low pulse is 1 ~ 3000ms.
7. the detection method of space dust according to claim 5, is characterized in that, the mean value of the corresponding dust concentration of low pulse width of described output pwm signal.
8. the detection method of space dust according to claim 5, is characterized in that, the instant value of the corresponding dust concentration of low pulse width of described output pwm signal.
9. the detection method of space dust according to claim 4, is characterized in that, described output dust concentration value reads the dust concentration of dust sensor by IIC interface.
10. the detection method of space dust according to claim 6, is characterized in that, the pwm signal of described output is that dust sensor output current transfers digital PWM signal pulse to after amplifying and correcting.
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| CN201410624841.XA CN104458520A (en) | 2014-11-06 | 2014-11-06 | Dust sensor and space dust detection method |
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| CN201410624841.XA CN104458520A (en) | 2014-11-06 | 2014-11-06 | Dust sensor and space dust detection method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105240953A (en) * | 2015-10-30 | 2016-01-13 | 广东美的制冷设备有限公司 | Air treatment device |
| CN106706659A (en) * | 2016-12-22 | 2017-05-24 | 武汉理工光科股份有限公司 | Digital detection system and method for flame detector |
| CN106872326A (en) * | 2017-04-12 | 2017-06-20 | 广东美的制冷设备有限公司 | The automatic zero-setting method of dust sensor |
| WO2018153016A1 (en) * | 2017-02-23 | 2018-08-30 | 深圳市易特科信息技术有限公司 | Indoor air dust monitoring apparatus having alarm functionality |
| CN108917818A (en) * | 2018-06-29 | 2018-11-30 | 深圳市同泰怡信息技术有限公司 | Machine box for server dust detection method and system |
| CN108956395A (en) * | 2017-05-18 | 2018-12-07 | 中兴通讯股份有限公司 | A kind of method and terminal of air atom Concentration Testing |
| CN112739957A (en) * | 2018-10-17 | 2021-04-30 | 博姆达株式会社 | Air purifying device |
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| US5971609A (en) * | 1994-10-31 | 1999-10-26 | Osaka Sanso Kogyo Ltd. | Method of measuring the dew point or frost point of a gas having low water content |
| CN201909754U (en) * | 2010-11-19 | 2011-07-27 | 上海翼捷工业安防技术有限公司 | Optical gas sensor |
| CN203183842U (en) * | 2012-11-13 | 2013-09-11 | 江舫 | Air purifier with particle sensor |
| CN103471972A (en) * | 2013-09-11 | 2013-12-25 | 南京云创存储科技有限公司 | Automatic sampling acquisition system |
| CN203551443U (en) * | 2013-11-05 | 2014-04-16 | 锦州海伯伦汽车电子有限公司 | Built-in fan type particulate matter sensor |
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| US5971609A (en) * | 1994-10-31 | 1999-10-26 | Osaka Sanso Kogyo Ltd. | Method of measuring the dew point or frost point of a gas having low water content |
| CN201909754U (en) * | 2010-11-19 | 2011-07-27 | 上海翼捷工业安防技术有限公司 | Optical gas sensor |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105240953A (en) * | 2015-10-30 | 2016-01-13 | 广东美的制冷设备有限公司 | Air treatment device |
| CN106706659A (en) * | 2016-12-22 | 2017-05-24 | 武汉理工光科股份有限公司 | Digital detection system and method for flame detector |
| CN106706659B (en) * | 2016-12-22 | 2019-09-10 | 武汉理工光科股份有限公司 | Flame detector digitized detection system and method |
| WO2018153016A1 (en) * | 2017-02-23 | 2018-08-30 | 深圳市易特科信息技术有限公司 | Indoor air dust monitoring apparatus having alarm functionality |
| CN106872326A (en) * | 2017-04-12 | 2017-06-20 | 广东美的制冷设备有限公司 | The automatic zero-setting method of dust sensor |
| CN106872326B (en) * | 2017-04-12 | 2020-05-05 | 广东美的制冷设备有限公司 | Automatic zero setting method of dust sensor |
| CN108956395A (en) * | 2017-05-18 | 2018-12-07 | 中兴通讯股份有限公司 | A kind of method and terminal of air atom Concentration Testing |
| CN108956395B (en) * | 2017-05-18 | 2021-01-08 | 中兴通讯股份有限公司 | Method and terminal for detecting air particle concentration |
| CN108917818A (en) * | 2018-06-29 | 2018-11-30 | 深圳市同泰怡信息技术有限公司 | Machine box for server dust detection method and system |
| CN112739957A (en) * | 2018-10-17 | 2021-04-30 | 博姆达株式会社 | Air purifying device |
| CN112739957B (en) * | 2018-10-17 | 2023-02-28 | 博姆达株式会社 | Air purifying device |
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Application publication date: 20150325 |