CN102495009A - Wireless sensing method for gas detection and device thereof - Google Patents
Wireless sensing method for gas detection and device thereof Download PDFInfo
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- CN102495009A CN102495009A CN2011103707434A CN201110370743A CN102495009A CN 102495009 A CN102495009 A CN 102495009A CN 2011103707434 A CN2011103707434 A CN 2011103707434A CN 201110370743 A CN201110370743 A CN 201110370743A CN 102495009 A CN102495009 A CN 102495009A
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Abstract
A wireless sensing method for gas detection and a device thereof. The device includes a sensing unit, a processor unit, a wireless transmit-receive unit and a battery unit, wherein the sensing unit comprises a laser current and temperature controller, an adjustable laser diode module, a gas chamber, a photodiode and an A/D converter. The laser current and temperature controller drives the laser diode module to output laser of constant power, and the laser wavelength is scanned within the absorption line range of a gas to be detected. The laser passes through the gas chamber, is received by the photodiode and is converted into an electrical signal. The electrical signal is then acquired by the A/D converter as a digital signal to be detected. The digital signal to be detected is transmitted to the processor unit, which reconstructs the digital signal to be detected into absorption spectrum of the gas to be measured according to a synchronizing signal fed back by the laser current and temperature controller. The concentration of the gas to be measured is calculated according to the calibrated stand gas absorption spectrum. The result of the gas concentration is transmitted by the wireless transmit-receive unit. The device has advantages of small volume, simple structure, stable operation and flexible networking.
Description
Technical field
The present invention relates to a kind of gas detection wireless sensing method and device.
Background technology
Optical fiber sensing technology is to follow the development of Fibre Optical Communication Technology the seventies in 20th century and develop rapidly, is carrier with the light wave, and optical fiber is medium, the novel sensing technology of perception and the extraneous measured signal of transmission.Be compared to the traditional optical sensor-based system based on the optical detection system of optical fiber and said a lot of advantages.More topmost is can design one to stablize passive probe and in rugged surroundings, work, and away from the monitoring station, this is the factor that has very much advantage in the application of harsh and unforgiving environments.Next is to develop the multiplexed network system, and through being preset in the communication media in the optical cable, single demodulating unit can be monitored a plurality of low-cost passive sensing heads.But there is a problem in conventional silicon optical fiber, be exactly transmission spectrum be restricted can only be from the visible light to the near infrared region (600nm～2000nm).As a rule gas in the absorption in infrared and far infrared zone be better than near infrared region, so be operated in the measuring accuracy that near infrared region will influence gas.All use the long air chamber of tens meters even up to a hundred meters in a lot of documents, the intensity of raising absorption signal; Perhaps control the pressure of tested gas, reduce air pressure and make the absorption line signal that narrows down become clear.Above method can reduce the difficulty of signal Processing, the precision of improve measuring, but these methods make detection system become bulky, and complex structure has limited the practicality of this method.
In addition, along with the development of MEMS, radio communication and Digital Electronic Technique, make the sensing node of exploitation small size and short-distance wireless communication become possibility.Wireless sensing node has low cost, low-power consumption and multi-functional characteristics, generally is made up of sensing, data processing and communications portion.The wireless sensing node that is distributed in a large number in the sensitive zones has been formed radio sensing network, and they can be that the individuality of relatively independent work also can be formed the network of cooperating with each other.On the one hand, the wireless sensing point carries processor, can carry out a computing and a transmission measurement result in this locality, rather than original data.On the other hand, must cooperate with each other between sensing node and set up the route of data, measurement result all is transferred to sink node and final user.
Summary of the invention
The technical matters that solves: Fibre Optical Sensor gas detection technology and wireless sensor technology are combined; Invent a kind of novel gas detection wireless sensing method and device, solve that original Fibre Optical Sensor gas detection technology is bulky, complex structure, the inflexible problem of networking.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of gas detection wireless sensing device, it comprises sensing unit, processor unit, wireless transmit/receive units and battery unit; Wherein sensing unit comprises laser diode current and temperature controller, tunable laser diode module, air chamber, photodiode and analog to digital converter; Its laser diode current links to each other with the tunable laser diode modular circuit with temperature controller; Photodiode links to each other with analog-digital converter circuit; Air chamber is between tunable laser diode module and photodiode; Processor unit links to each other with analog-digital converter circuit on one side, with laser diode current with temperature controller circuit link to each other on one side, battery unit links to each other with sensing unit, processor unit and wireless transmit/receive units circuit respectively and gives power supply.
In the gas detection wireless sensing device of the present invention, the tunable laser diode module is the distributed feedback laser module, and inside comprises a thermoelectric (al) cooler.
Gas detection wireless sensing device method of work of the present invention is: laser diode current and temperature controller drive the laser of tunable laser diode module output firm power; And this Wavelength of Laser is in the interscan of tested gas absorption spectrum line scope; This laser is received by photodiode through air chamber and is converted into electric signal; Be the measured number signal by the analog to digital converter collection then and give processor unit; Processor unit is tested gas absorption spectrum according to the synchronizing signal from laser diode current and temperature controller feedback with the measured number signal reconstruction; And calculating tested gas concentration according to the calibrating gas absorption spectra of demarcating, the result of gas concentration is transmitted by wireless transmit/receive units.
In the gas detection wireless sensing device of the present invention; The data processing method of processor unit comprises associated shift algorithm and the redundant linear equation of least square solution; At first calculate the related coefficient of tested gas absorption spectrum and calibrating gas absorption spectra; And the position of moving tested gas absorption spectrum is maximum up to related coefficient, asks the tested gas absorption spectrum R (λ after being moved according to following formula with least square method then
1) and calibrating gas absorption spectra R
0(λ
1) between linear coefficient ρ, this coefficient is exactly tested gas concentration.
The tunable laser diode module is the distributed feedback laser module, and inside comprises a thermoelectric (al) cooler, controls the output of wavelength through the temperature of modulation profile formula feedback laser.Battery unit is given sensor unit, processor unit and wireless transmit/receive units power supply.Sensor unit, processor unit and wireless transmit/receive units are in holding state when idle, the entering duty that when receiving the wireless signal order, is activated, and work is returned holding state after accomplishing.
The invention has the beneficial effects as follows: this gas detection wireless sensing method and structure, can work independently, order activates the gas detection task of accomplishing according to wireless signal; Networking flexibility has avoided power supply to connect the restriction that is connected with communication; Simple in structure, working stability has improved hardware and data processing method.
Description of drawings
Fig. 1 is a gas detection wireless sensing structural drawing
Among the figure: 1. sensing unit, 2. processor unit, 3. wireless transmit/receive units, 4. battery unit, 5. laser diode current and temperature controller, 6. tunable laser diode module, 7. air chamber, 8. photodiode, 9. analog to digital converter, 10. thermoelectric (al) cooler.
Fig. 2 is tested gas absorption spectrum
Embodiment
Gas detection wireless sensing structure of the present invention; As shown in Figure 1; Comprise sensing unit 1, processor unit 2, wireless transmit/receive units 3 and battery unit 4, wherein sensing unit 1 comprises laser diode current and temperature controller 5, tunable laser diode module 6, air chamber 7, photodiode 8 and analog to digital converter 9; Its laser diode current links to each other with tunable laser diode module 6 circuit with temperature controller 5; Photodiode 8 links to each other with analog to digital converter 9 circuit; Air chamber 7 is between tunable laser diode module 6 and photodiode 8; Processor unit 2 links to each other with analog to digital converter 9 circuit on one side, with laser diode current with temperature controller 5 circuit link to each other on one side, battery unit 4 links to each other with sensing unit 1, processor unit 2 and wireless transmit/receive units 3 circuit respectively and gives power supply.Its laser diode current and temperature controller 5 drive the laser of tunable laser diode module 6 output firm powers; And this Wavelength of Laser is in the interscan of tested gas absorption spectrum line scope; This laser is received by photodiode 8 through air chamber 7 and is converted into electric signal; Be the measured number signal and give processor unit 2 by analog to digital converter 9 collections then; Processor unit 2 is tested gas absorption spectrum according to the synchronizing signal from laser diode current and temperature controller 5 feedbacks with the measured number signal reconstruction, and calculates tested gas concentration according to the calibrating gas absorption spectra of demarcating, and the result of gas concentration is by wireless transmit/receive units 9 transmission.
The data processing method of processor unit comprises associated shift algorithm and the redundant linear equation of least square solution.Lag behind because temperature modulation and wavelength output exist, and the degree that lags behind is relevant with environment temperature, there are differences between the calibrating gas absorption spectra position of the gas absorption spectrum of reconstruct and demarcation, causes the error of measurement of concetration.So at first calculate the related coefficient of tested gas absorption spectrum and calibrating gas absorption spectra; And the position of moving tested gas absorption spectrum is maximum up to related coefficient; Tested gas absorption spectrum is moved to the position of calibrating gas absorption spectra, and this method is called the associated shift algorithm.Ask the tested gas absorption spectrum R (λ after being moved according to following formula with least square method then
1) and calibrating gas absorption spectra R
0(λ
1) between linear coefficient ρ, this coefficient is exactly tested gas concentration.
This embodiment makes an experiment as tested gas with carbon dioxide, selects to measure the absorption line of carbon dioxide at the 1572nm place of near infrared region.Carbon dioxide is lower in this regional absorption intensity, is 1/400 of methane, can verify measuring accuracy of the present invention.It is as shown in Figure 2 to test the absorption spectra that obtains the variable concentrations carbon dioxide, and this embodiment can be measured the carbon dioxide of concentration range 0-100%, and measuring accuracy can reach 0.3%.
Tunable laser diode module 6 is distributed feedback laser module LECENT D2526, and inside comprises a thermoelectric (al) cooler 10, controls the output of wavelength through the temperature of modulation profile formula feedback laser.Battery unit 4 is given sensor unit 1, processor unit 2 and wireless transmit/receive units 3 power supplies, and accomplishing a gas detection task power consumption is 1.26mAh.Sensor unit 1, processor unit 2 and wireless transmit/receive units are in holding state during 3 free time, the entering duty that when receiving the wireless signal order, is activated, and work is returned holding state after accomplishing.That the used processor unit 2 of the present invention is that TI aims at radio sensing network exploitation is 16 Reduced Instruction Set Computer MSP430F2274, and instruction cycletime is 62.5ns, has flash memory and the 1kB RAS of 32kB.Wireless transmit/receive units 3 is low-cost, low-power consumption, is operated in the RF transceiver CC2500 of 2400～2483MHz frequency range.
Claims (8)
1. gas detection wireless sensing device, it is characterized in that: it comprises sensing unit (1), processor unit (2), wireless transmit/receive units (3) and battery unit (4); Wherein sensing unit (1) comprises laser diode current and temperature controller (5), tunable laser diode module (6), air chamber (7), photodiode (8) and analog to digital converter (9); Its laser diode current links to each other with tunable laser diode module (6) circuit with temperature controller (5); Photodiode (8) links to each other with analog to digital converter (9) circuit; Air chamber (7) is positioned between tunable laser diode module (6) and the photodiode (8); Processor unit (2) links to each other with analog to digital converter (9) circuit on one side; Link to each other with temperature controller (5) circuit with laser diode current on one side, battery unit (4) links to each other with sensing unit (1), processor unit (2) and wireless transmit/receive units (3) circuit respectively and gives power supply.
2. gas detection wireless sensing device according to claim 1 is characterized in that: tunable laser diode module (6) is distributed feedback laser module LECENT D2526, and inside comprises a thermoelectric (al) cooler (10).
3. gas detection wireless sensing device according to claim 1; It is characterized in that: that processor unit (2) is that TI aims at radio sensing network exploitation is 16 Reduced Instruction Set Computer MSP430F2274; Instruction cycletime is 62.5ns, has flash memory and the 1kB RAS of 32kB.
4. gas detection wireless sensing device according to claim 1 is characterized in that: wireless transmit/receive units (3) is operated in the RF transceiver CC2500 of 2400～2483MHz frequency range.
5. each described gas detection wireless sensing device method of work of claim 1-4; It is characterized in that: laser diode current and temperature controller (5) drive the laser of tunable laser diode module (6) output firm power; And this Wavelength of Laser is in the interscan of tested gas absorption spectrum line scope; This laser is received by photodiode (8) through air chamber (7) and is converted into electric signal; Gather to the measured number signal by analog to digital converter (9) then and give processor unit (2); Processor unit (2) is tested gas absorption spectrum according to the synchronizing signal from laser diode current and temperature controller (5) feedback with the measured number signal reconstruction, and calculates tested gas concentration according to the calibrating gas absorption spectra of demarcating, and the result of gas concentration is transmitted by wireless transmit/receive units (9).
6. gas detection wireless sensing device method of work according to claim 5; It is characterized in that: the data processing method of processor unit (2) comprises associated shift algorithm and the redundant linear equation of least square solution; At first calculate the related coefficient of tested gas absorption spectrum and calibrating gas absorption spectra; And the position of moving tested gas absorption spectrum is maximum up to related coefficient; Ask tested gas absorption spectrum and the linear coefficient between the calibrating gas absorption spectra after being moved with least square method then, this linear coefficient is exactly tested gas concentration.
7. gas detection wireless sensing device method of work according to claim 5 is characterized in that: tunable laser diode module (6) is through the output of the temperature control wavelength of modulation profile formula feedback laser.
8. gas detection wireless sensing device method of work according to claim 5; It is characterized in that: sensing unit (1), processor unit (2) and wireless transmit/receive units (3) are in holding state when idle; When receiving the wireless signal order entering duty that the time is activated, work is returned holding state after accomplishing.
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| CN2011103707434A CN102495009A (en) | 2011-11-21 | 2011-11-21 | Wireless sensing method for gas detection and device thereof |
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| CN2011103707434A CN102495009A (en) | 2011-11-21 | 2011-11-21 | Wireless sensing method for gas detection and device thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280157A (en) * | 2014-11-07 | 2015-01-14 | 上海艾络格电子技术有限公司 | Low-power-consumption transmitter |
| CN109444064A (en) * | 2018-12-25 | 2019-03-08 | 青岛海纳光电环保有限公司 | Calibrating gas detection device and system |
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| US20060044562A1 (en) * | 2004-08-25 | 2006-03-02 | Norsk Elektro Optikk As | Gas monitor |
| CN1849507A (en) * | 2003-09-12 | 2006-10-18 | Ir微系统股份有限公司 | Gas detection method and gas detector device |
| CN102128812A (en) * | 2010-12-29 | 2011-07-20 | 重庆大学 | Laser remote energy supply-based device and method for detecting trace gas |
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2011
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| CN1849507A (en) * | 2003-09-12 | 2006-10-18 | Ir微系统股份有限公司 | Gas detection method and gas detector device |
| US20060044562A1 (en) * | 2004-08-25 | 2006-03-02 | Norsk Elektro Optikk As | Gas monitor |
| CN102128812A (en) * | 2010-12-29 | 2011-07-20 | 重庆大学 | Laser remote energy supply-based device and method for detecting trace gas |
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| CLINTON J.SMITH ET AL: "Low-power Wireless Trace Gas Sensing Network", 《SPIE PROCEEDINGS》 * |
| J.M.GONG ET AL: "Enhancement of wavelength detection accuracy in fiber Bragg grating sensors by using a spectrum correlation technique", 《OPTICS COMMUNICATIONS》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280157A (en) * | 2014-11-07 | 2015-01-14 | 上海艾络格电子技术有限公司 | Low-power-consumption transmitter |
| CN109444064A (en) * | 2018-12-25 | 2019-03-08 | 青岛海纳光电环保有限公司 | Calibrating gas detection device and system |
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