CN202066770U - Dust concentration sensor - Google Patents
Dust concentration sensor Download PDFInfo
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- CN202066770U CN202066770U CN2010205444364U CN201020544436U CN202066770U CN 202066770 U CN202066770 U CN 202066770U CN 2010205444364 U CN2010205444364 U CN 2010205444364U CN 201020544436 U CN201020544436 U CN 201020544436U CN 202066770 U CN202066770 U CN 202066770U
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Abstract
The utility model discloses a powder concentration sensor which comprises a sampling unit, a photoelectric conversion unit, a signal amplification unit and a processing unit, wherein the external dust-containing air is sucked into the sensor by the sampling unit and passes through the photoelectric conversion unit; the photoelectric conversion unit provides a light source, irradiates the passing dust-containing air to generate scattered light, converters the scattered light into a voltage output signal and outputs the voltage signal to the signal amplification unit; the signal amplification unit is connected with a semiconductor optical detector and amplifies and outputs the received signal; the processing unit is connected with the signal amplification unit and calculates the powder concentration according to proportion relationship of the voltage signal output by the signal amplification unit, a pre-stored voltage signal and the powder concentration. The powder concentration sensor has reasonable structure, good measurement stability and high sensitivity and accuracy and is easy to maintain.
Description
Technical field
The utility model relates to a kind of air purity checkout equipment, is specifically related to a kind of sensor of dust concentration.
Background technology
Present measurement for 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 that extracts certain volume, dust is trapped on the filter membrane, according to the dust quality that increases on the filter membrane, utilize formula to calculate dust mass concentration in the unit volume air again.This mode not only is not easy to operation, and can not continuous coverage.A kind of is the direct-reading dust gauge, mainly utilize principles such as indirect method such as light scattering, the absorption of β source, utilize sampling thief to demarcate, but the dust concentration value that instant playback is measured is come, but the working time is short, the measurement number of times is limited, can not can only use as the portable dust gauge of routine the dust continuous monitoring.
But but develop a kind of continuous detecting direct-reading dust concentration sensor continuous detecting dust concentration now.
The patent No. is " CN200620125097.X ", patent name " a kind ofly carries out long-time continuous monitoring and instant playback dust concentration value to dust concentration, converts the sensor that frequency signal is exported simultaneously to for the Chinese patent of " sensor of dust concentration " disclose.Structure is made up of shell, dust sampling head, dust room, blower fan, photoelectric receiving arrangement; " " photoelectric receiving arrangement comprises light source base, light source shelf, light source sealing shroud, photomultiplier ".The sensor of dust concentration of this patent disclosure can be implemented in the continuous working under the dust atmosphere, but because of it uses photomultiplier, need provide higher voltage during use, and this has constituted potential safety hazard in the dust work place.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned shortcoming of the prior art, and a kind of photomultiplier that need not is provided, stable sensitivity height, and small and exquisite powder concn sensor rational in infrastructure.
A kind of powder concn sensor of the present utility model comprises sampling unit, photoelectric conversion unit, signal amplification unit, processing unit,
Described sampling unit, with the described sensor internal of extraneous dust laden air suction, and through photoelectric conversion unit;
Photoelectric conversion unit provides a light source, the dust laden air of irradiation process, and produce scattered light, described scattered light is converted to the voltage output signal, and exports described voltage signal to signal amplification unit; Described photoelectric conversion unit comprises a semiconductor laser light resource that sends laser beam, sends in this LASER Light Source on the working direction of light beam, is provided with incident light passage, area of illumination, emergent light passage, light trapping successively; Through area of illumination and be provided with spherical reflector, optical semiconductor detector with the light path vertical direction, spherical reflector and photo-detector are respectively on the both sides of area of illumination; Described air inlet tube and outgoing gas connection tube are symmetrically distributed in the both sides of area of illumination, and air inlet tube is in the upper end of area of illumination, and outgoing gas connection tube is in the lower end of area of illumination, and the caliber of described air inlet tube is less than the caliber of outgoing gas connection tube; The pore of described air inlet tube is offset flat shape;
Signal amplification unit links to each other with optical semiconductor detector in the photoelectric conversion unit, the electric signal that receives is handled amplified and output.
Processing unit is connected with signal amplification unit, calculates powder concn based on the voltage signal of signal amplification unit output and the proportionate relationship of voltage signal that prestores and powder concn.
In preferred embodiment of the utility model, described sampling unit comprises thief hatch, draft tube, gas outlet, exhausr port, and described thief hatch connects draft tube, and draft tube is passed described photoelectric conversion unit and connected the sampling pump inlet, the sampling pump outlet connects gas outlet, and gas outlet connects exhausr port.
In preferred embodiment of the utility model, described photoelectric conversion unit is provided with a cavity that communicates with the external world, and this cavity is used to hold spherical reflector, is convenient to the dismounting of spherical reflector.
In preferred embodiment of the utility model, the power of described LASER Light Source is the 2-3.5 milliwatt.
In preferred embodiment of the utility model, described light trapping inwall is a black.
In preferred embodiment of the utility model, described semiconductor photo detector is high sensitive photodiode.
In preferred embodiment of the utility model, described signal amplification unit comprises differential amplifier circuit, signal detection circuit, integration and output circuit;
Described differential amplifier circuit, with the optical semiconductor detector electric connection in the photoelectric conversion unit, this differential amplifier circuit carries out differential, amplification to the electric signal of input;
Described signal detection circuit electrically connects with this differential amplifier circuit, and this signal detection circuit is taken a sample to the electric signal after differential amplifier circuit differential, amplification and detected;
Described integration and output circuit, electrically connect with this signal detection circuit, this integration and output circuit receive the result that sampling detects from signal detection circuit, and this result is carried out integration, and be converted to direct current signal with the dust concentration size variation, again this direct current signal is transferred to this processor.
In preferred embodiment of the utility model, described differential amplifier circuit comprises operational amplifier, electric capacity and resistance, this differential amplifier circuit carries out differential, amplification to the electric signal that is converted by the dust light signal that receives from photoelectric conversion unit, is amplitude, the different electric signal of width with the different switching of shape by size with this dust light signal.
In preferred embodiment of the utility model, this signal detection circuit comprises a high-frequency diode.
In preferred embodiment of the utility model, this integration and output circuit comprise amplifier, resistance, electric capacity, and wherein, this resistance and electric capacity constitute a time constant circuit.
The utility model is compared its advantage with the prior art scheme: rational in infrastructure, measurement stability is good, sensitivity precision height, easy care.
Description of drawings
Fig. 1 is a kind of embodiment inner structure synoptic diagram of the present utility model;
Fig. 2 looks synoptic diagram for the right side of Fig. 1;
Fig. 3 looks synoptic diagram for the left side of Fig. 1;
Fig. 4 is a kind of structural representation of photoelectricity conversion unit;
Fig. 5 is Fig. 4 vertical view cutaway drawing;
Fig. 6 is the sectional view of air inlet tube in the prior art;
Fig. 7 is the sectional view of air inlet tube in the present embodiment;
Fig. 8 is the functional-block diagram of the utility model signal amplification unit.
Wherein, 1 is casing; 2 is signal processing unit; 3 are the insulation fixed head; 4 is draft tube; 5 is thief hatch; 6 is photoelectric conversion unit; 7 is signal amplification unit; 8 is exhausr port; 9 for hanging handle; 10 is interface; 11 is sampling pump; 12 is gas outlet; 61 is LASER Light Source; 62 is the total mount pad of photoelectricity conversion unit; 63 is air inlet tube; 64 is outgoing gas connection tube; 65 is photodetector; 66 is the light source mount pad; 68 is spherical reflector; 621 is emitting light path; 622 is input path; 623 is light trapping; 631 is pore; 632 is tube wall; 71 is differential amplifier circuit; 72 is signal detection circuit; 73 is integration and output circuit; 74 is circuit board; 75 is the circuit mount pad.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present utility model is described in detail, thereby protection domain of the present utility model is made more explicit defining so that advantage of the present utility model and feature can be easier to be it will be appreciated by those skilled in the art that.
As Fig. 1 in conjunction with Fig. 2, shown in Figure 3, the sensor of present embodiment comprises casing 1, signal processing unit 2, insulation fixed head 3, draft tube 4, thief hatch 5, photoelectric conversion unit 6, signal amplification unit 7, exhausr port 8, suspension handle 10, sampling pump 11, gas outlet 12.Thief hatch 5 is in the upper end, left side of casing 1, connect draft tube 4, draft tube 4 is passed photoelectricity conversion unit 6 and is connected the sampling pump inlet, the sampling pump outlet connects gas outlet 12 again, exhausr port 8 is in the bottom of casing 1, photoelectric conversion unit 6 connects signal amplification unit 7, and signal amplification unit 7 connects signal processing unit 2 again.Thief hatch 5, draft tube 4, sampling pump 11, gas outlet 12, exhausr port 8 are formed the sampling system unit.Insulation fixed head 3 is divided into former and later two spaces with space in the casing, sampling system unit and photoelectric conversion unit 6 are arranged and are fixed on the insulation fixed head, be positioned at the space of the back of casing, signal processing unit 2 is fixed on the another side of insulation fixed head, is positioned at the space of the front of casing.The casing upper end is equipped with and is hung handle 9, the sensor of present embodiment can be suspended on eminence and use.
In conjunction with shown in Figure 5, total mount pad 62 is a rectangular structure as Fig. 4, and there is a circular space centre as area of illumination, and LASER Light Source 61 is installed in the left end mounting hole of total mount pad 62, is fixed on total mount pad by mount pad 67, can connect by screw.In total mount pad 62 right-hand member mounting holes the closure of openings of a black object with mounting hole arranged, form light trapping.Be connected to air inlet tube 63 in total mount pad 62 upper end holes, be connected to outgoing gas connection tube 64 in the following stomidium, described air inlet tube 63, outgoing gas connection tube 64 all extend inward into the light area.In total mount pad 62 front end mounting holes spherical reflector 68 is installed, photodetector 65 is installed in the mounting hole of rear end, photodetector 65 is connected with signal amplification unit 7.Circuit board 74 is fixedly connected on the back of total mount pad 62 by circuit mount pad 75.
As shown in Figure 6, dust laden air is rotating and is entering admission line under the effect of sampling pump 11, and the pore 631 of air inlet tube 63 of the prior art is rounded, thereby make dust granules closeer in the tube chamber central distribution, peripheral distribution is laxer, and skewness can influence measuring accuracy like this, simultaneously when dust concentration acquires a certain degree, overstocked because of tube chamber center dust density, make and can't continue to measure, thereby range ability is little.
As shown in Figure 7, the pore 631 of the air inlet tube 63 of present embodiment is flat, and dust granules is clashed in tube wall, and it is forced shaping, changes its regularity of distribution, and dust granules is evenly distributed, thereby improves measuring accuracy, improves range ability simultaneously.
The inwall of light trapping 623 all is a black, but absorbing light, and no reflection events can not produce interference.
The caliber of outgoing gas connection tube 64 forms approximate infundibulate greater than the caliber of air inlet tube 63, and is long-pending thereby the dust granules in the minimizing dust laden air pushes away in area of illumination, and then can reduce maintenance times.
Photodetector 65 can be selected high sensitive photodiode for use.
LASER Light Source 61 is optional to be the 2-3.5 milliwatt with power.
The work of the sensor of present embodiment is divided into two parts:
The one, sampling section: start sampling pump 11, with extraneous dust laden air from gas production mouth suction draft tube, draft tube connects air inlet tube 63, enter photoelectricity conversion unit 6, entering sampling pump 11 from outgoing gas connection tube 64 discharge photoelectricity conversion units 6, the outlet of sampling pump 11 connects gas outlet 12 air is discharged sensors from exhausr port 8.
The 2nd, the test section: dust laden air enters from air inlet tube 63, through area of illumination, discharges at outgoing gas connection tube 64.LASER Light Source 61 enters from input path 622, through area of illumination, enters light trapping 623 from emitting light path 621.When light when area of illumination shines dust granules in the dust laden air, can reflect, part refract light can directly reflect the photosensitive area that enters photo-detector 65, another part can be refracted on the spherical reflector 68, by specular reflective mirrors 68 refract light is reflected the photosensitive area that enters photo-detector 65 again, photo-detector is changed to voltage signal with the light signal dress that receives and is transferred to signal amplification unit 7.Voltage signal after signal amplification unit 7 will amplify is input to signal processing unit 2 and handles.
As shown in Figure 8, described signal amplification unit 7 comprises differential amplifier circuit 71, signal detection circuit 72, integration and output circuit 73, and described signal amplification unit one end connects photoelectric conversion unit 6, and the other end is connected to signal processing unit 2.Wherein, differential amplifier circuit 71 comprises elements such as operational amplifier, electric capacity, resistance, and differential amplifier circuit 71 stability is high, and its enlargement factor is up to 100,000 times, and can self-excitation.Differential amplifier circuit 71 receives the dust electric signal that dust senses from air from photoelectric conversion unit 6, and this electric signal carried out differential, amplification, and then with detected dust light signal different with shape by size, be converted to amplitude, the different electric signal of width.
Integration and output circuit 73 comprise elements such as amplifier, resistance, electric capacity, and wherein, resistance and electric capacity are used to constitute the integration circuit time constant circuit.73 pairs of electric signal from signal detection circuit 72 outputs of this integration and output circuit carry out the dust light signal that integration detects with reduction, and are converted to the direct current signal with the dust concentration size variation.Afterwards, this integration and output circuit 73 export this direct current signal to signal processing unit 2 and handle, with dust content in the statistics air.Wherein, signal processing unit 2 comprise central processing unit (center processing unit, CPU) or computing machine.
The above; it only is embodiment of the present utility model; but protection domain of the present utility model is not limited thereto; any those of ordinary skill in the art are in the disclosed technical scope of the utility model; variation or the replacement that can expect without creative work all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain that claims were limited.
Claims (10)
1. a sensor of dust concentration comprises sampling unit, photoelectric conversion unit, signal amplification unit, and processing unit is characterized in that:
Described sampling unit, with the described sensor internal of extraneous dust laden air suction, and through photoelectric conversion unit;
Photoelectric conversion unit provides a light source, the dust laden air of irradiation process, and produce scattered light, described scattered light is converted to the voltage output signal, and exports described voltage signal to signal amplification unit; Described photoelectric conversion unit comprises a semiconductor laser light resource that sends laser beam, sends in this LASER Light Source on the working direction of light beam, is provided with incident light passage, area of illumination, emergent light passage, light trapping successively; Through area of illumination and be provided with spherical reflector, optical semiconductor detector with the light path vertical direction, spherical reflector and photo-detector are respectively on the both sides of area of illumination; Described air inlet tube and outgoing gas connection tube are symmetrically distributed in the both sides of area of illumination, and air inlet tube is in the upper end of area of illumination, and outgoing gas connection tube is in the lower end of area of illumination, and the caliber of described air inlet tube is less than the caliber of outgoing gas connection tube; The pore of described air inlet tube is offset flat shape;
Signal amplification unit links to each other with optical semiconductor detector in the photoelectricity conversion unit, the electric signal that receives is handled amplified and output;
Processing unit is connected with signal amplification unit, calculates powder concn based on the voltage signal of signal amplification unit output and the proportionate relationship of voltage signal that prestores and powder concn.
2. a kind of sensor of dust concentration according to claim 1, it is characterized in that: described sampling unit comprises thief hatch, draft tube, gas outlet, exhausr port, described thief hatch connects draft tube, draft tube is passed described photoelectric conversion unit and is connected the sampling pump inlet, the sampling pump outlet connects gas outlet, and gas outlet connects exhausr port.
3. a kind of sensor of dust concentration according to claim 1 is characterized in that: described photoelectric conversion unit is provided with a cavity that communicates with the external world, and this cavity is used to hold spherical reflector, is convenient to the dismounting of spherical reflector.
4. a kind of sensor of dust concentration according to claim 3 is characterized in that: the power of described LASER Light Source is the 2-3.5 milliwatt.
5. a kind of sensor of dust concentration according to claim 4 is characterized in that: described light trapping inwall is a black.
6. according to the described a kind of sensor of dust concentration of one of claim 3 to 5, it is characterized in that: described semiconductor photo detector is high sensitive photodiode.
7. a kind of sensor of dust concentration according to claim 1 is characterized in that: described signal amplification unit comprises differential amplifier circuit, signal detection circuit, integration and output circuit;
Described differential amplifier circuit, with the optical semiconductor detector electric connection in the photoelectric conversion unit, this differential amplifier circuit carries out differential, amplification to the electric signal of input;
Described signal detection circuit electrically connects with this differential amplifier circuit, and this signal detection circuit is taken a sample to the electric signal after differential amplifier circuit differential, amplification and detected;
Described integration and output circuit, electrically connect with this signal detection circuit, this integration and output circuit receive the result that sampling detects from signal detection circuit, and this result is carried out integration, and be converted to direct current signal with the dust concentration size variation, again this direct current signal is transferred to this processor.
8. a kind of sensor of dust concentration according to claim 7, it is characterized in that: described differential amplifier circuit comprises operational amplifier, electric capacity and resistance, this differential amplifier circuit carries out differential, amplification to the electric signal that is converted by the dust light signal that receives from photoelectric conversion unit, is amplitude, the different electric signal of width with the different switching of shape by size with this dust light signal.
9. a kind of sensor of dust concentration according to claim 7 is characterized in that this signal detection circuit comprises a high-frequency diode.
10. a kind of sensor of dust concentration according to claim 7 is characterized in that this integration and output circuit comprise amplifier, resistance, electric capacity, and wherein, this resistance and electric capacity constitute a time constant circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205444364U CN202066770U (en) | 2010-09-27 | 2010-09-27 | Dust concentration sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205444364U CN202066770U (en) | 2010-09-27 | 2010-09-27 | Dust concentration sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202066770U true CN202066770U (en) | 2011-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205444364U Expired - Lifetime CN202066770U (en) | 2010-09-27 | 2010-09-27 | Dust concentration sensor |
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| CN (1) | CN202066770U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837451A (en) * | 2014-02-28 | 2014-06-04 | 苏州亿利安机电科技有限公司 | Dust sensor for on-line monitoring of dust concentration |
| CN105092442A (en) * | 2014-05-14 | 2015-11-25 | 苏州元泰自动化科技有限公司 | Fine particle measuring device and measuring method |
| CN105917218A (en) * | 2013-10-16 | 2016-08-31 | 埃米森斯技术有限公司 | Electrochemical sensing using voltage-current time differential |
| CN107132203A (en) * | 2017-05-04 | 2017-09-05 | 北京清环智慧水务科技有限公司 | Gas degree of purity detection method, system and device |
| CN108709847A (en) * | 2018-06-22 | 2018-10-26 | 佛山融芯智感科技有限公司 | A kind of air particles detection method and detection device |
-
2010
- 2010-09-27 CN CN2010205444364U patent/CN202066770U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105917218A (en) * | 2013-10-16 | 2016-08-31 | 埃米森斯技术有限公司 | Electrochemical sensing using voltage-current time differential |
| CN105917218B (en) * | 2013-10-16 | 2020-01-03 | 埃米森斯技术有限公司 | Electrochemical sensing using voltage-current time differentiation |
| CN103837451A (en) * | 2014-02-28 | 2014-06-04 | 苏州亿利安机电科技有限公司 | Dust sensor for on-line monitoring of dust concentration |
| CN105092442A (en) * | 2014-05-14 | 2015-11-25 | 苏州元泰自动化科技有限公司 | Fine particle measuring device and measuring method |
| CN105092442B (en) * | 2014-05-14 | 2018-07-20 | 江苏元泰智能科技股份有限公司 | A kind of fine particle measuring device and its measurement method |
| CN107132203A (en) * | 2017-05-04 | 2017-09-05 | 北京清环智慧水务科技有限公司 | Gas degree of purity detection method, system and device |
| CN108709847A (en) * | 2018-06-22 | 2018-10-26 | 佛山融芯智感科技有限公司 | A kind of air particles detection method and detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20111207 Effective date of abandoning: 20120725 |