CN203396701U - Sensor node device for methane content WSN (wireless sensor network) - Google Patents
Sensor node device for methane content WSN (wireless sensor network) Download PDFInfo
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- CN203396701U CN203396701U CN201320399140.1U CN201320399140U CN203396701U CN 203396701 U CN203396701 U CN 203396701U CN 201320399140 U CN201320399140 U CN 201320399140U CN 203396701 U CN203396701 U CN 203396701U
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Abstract
The utility model provides a sensor node device for a methane content WSN (wireless sensor network). The sensor node device comprises an infrared gas sensor, a signal conditioning circuit, a light source drive circuit, a sound and light alarm and an alarm drive circuit of the infrared gas sensor, a wireless microcontroller and a temperature sensor, wherein the infrared gas sensor is connected with a light source in the infrared gas sensor; the light source drive circuit, the signal conditioning circuit and the alarm drive circuit are all respectively connected with an input/output (I/O) port of the wireless microcontroller; the temperature sensor is arranged in the infrared gas sensor; the temperature sensor is connected with the signal conditioning circuit through a differential amplifier. According to the device, the temperature sensor is arranged in an infrared detector for automatically compensating the ambient temperature in the infrared detector without personal correction; the device has the advantages of wide measurement range, high precision, high sensitivity, high reliability, high anti-interference capacity, low power consumption and the like, is convenient to use and low in maintenance cost; a software system can be updated in time, the requirement on technical development of internet of things is met; therefore, the device has a wide application prospect.
Description
Technical field
The utility model relates to a kind of WSN sensor node apparatus, especially methane content WSN sensor joint
Point apparatus.
Background technology
The principal ingredient of rock gas is methane, and methane is the blasting compound in industrial circle and town gas, and it is very necessary that the methane gas in surrounding environment is carried out to early stage safety detection.In household, people seldom pay attention to the content of gas, are also just unable to find out the content of rock gas in environment, so in order to guarantee household's the security of the lives and property, prevent that naked light is explosion caused, must be able to monitor the content of rock gas in room.
The method that methane content detects mainly contains two classes: a class is to utilize the relation of the refractive index of methane concentration and light to measure by interferometric method, and another kind of is to utilize the spectral absorption characteristics of methane gas to detect methane concentration.Interferometric sensor needs frequent adjustment, is subject to the interference of other gases, and its reliability and stability are all poor, and the current technology of spectral absorption method is relatively ripe.In recent years, development due to optical fiber and detecting technique, optical fiber can be realized the long Distance Transmission of signal, and Fibre Optical Sensor luminous power used is lower, comparatively safe, so the rugged surroundings such as that sensing head can be put into is poisonous, high temperature and flammable explosive gas are put, realize the real-time security remote measurement to scene.
At present, rock gas content namely for methane content detection sensor in most of air, is subject to rugged surroundings impact, and acquisition precision is poor, and zero point drift is serious, every a period of time, needs artificial correction, has both increased maintenance cost, has reduced again measuring accuracy.
Utility model content
The purpose of this utility model is to be subject to for overcoming current methane content detecting sensor the shortcoming that rugged surroundings affect, zero point drift is serious, measuring accuracy is low and maintenance cost is high.
For achieving the above object, the technical solution adopted in the utility model is as follows:
A kind of methane content WSN sensor node apparatus is provided, comprise infrared gas sensor and signal conditioning circuit thereof, light source driving circuit, audible-visual annunciator and warning driving circuit and wireless microcontroller, infrared gas sensor is connected with the light source in infrared gas sensor, light source driving circuit, signal conditioning circuit and warning driving circuit are connected to an I/O port of wireless microcontroller respectively, also comprise the temperature sensor being placed in described infrared gas sensor, temperature sensor is connected to signal conditioning circuit by differential amplifier.
Described infrared gas sensor comprises that sampling air chamber is positioned at the light source of sampling on air chamber one inwall with stretching in sampling air chamber, on sampling air chamber one sidewall, be respectively equipped with gas access and outlet, another is provided with measurement optical filter with the inwall of light source place inwall symmetry and with reference to optical filter sampling air chamber, light source is exported measuring-signal GAS after measuring optical filter, and light source is exported reference signal REF after by reference to optical filter.
Described signal conditioning circuit comprises in-phase amplifier one, in-phase amplifier two, divider, second order filter, in-phase adder and follower, described measuring-signal GAS is connected to the input end of in-phase amplifier one, described reference signal REF is connected to the input end of in-phase amplifier two, the output terminal of in-phase amplifier one and in-phase amplifier two is all connected to the input end of divider, the output terminal of divider is connected to the input end of second order filter, the output terminal of second order filter and the output terminal of described differential amplifier are connected respectively to two input ends of in-phase adder, the output terminal of in-phase adder is connected to the input end of follower, the output terminal of follower is connected to an I/O port of described wireless microcontroller.
Described temperature sensor is silicon diode.
The utility model adopts ZigBee technology and the wireless mixed signal microcontroller of JN5139, elementary cell from WSN (wireless sensor network), adopt infrared absorption type gas sensor image data, designed and there is the flexible and changeable of full-function device (FFD) based on JN5139 wireless microcontroller, rock gas content level sensor node in the air of superior performance, for setting up high performance WSN, done basic work, system configuration is flexible, there is route and node locating function, save energy consumption, without very large change, just can be applied in various network topologies.The utility model is built in infrared eye inside by temperature sensor environment temperature is carried out to auto-compensation, without artificial correction, have that measurement range is wide, precision and highly sensitive, fast response time, selectivity is good, reliability is high, antijamming capability is strong and the plurality of advantages such as low in energy consumption, easy to use, maintenance cost is low, software systems can upgrade in time, have adapted to the requirement of technology of Internet of things development, have broad application prospects.
Accompanying drawing explanation
Fig. 1 is the utility model theory diagram;
Fig. 2 is infrared absorption type gas sensor configuration figure;
Fig. 3 is signal conditioning circuit theory diagram;
Fig. 4 is temperature sensor and differential amplifier electrical schematic diagram thereof;
Fig. 5 is in-phase amplifier one electrical schematic diagram;
Fig. 6 is in-phase amplifier two electrical schematic diagrams;
Fig. 7 is divider electrical schematic diagram;
Fig. 8 is second order filter electrical schematic diagram;
Fig. 9 is in-phase adder electrical schematic diagram.
In figure: 1. JN5139 wireless microcontroller, 2. infrared gas sensor, 3. signal conditioning circuit, 4. temperature sensor, 5. differential amplifier, 6. light source driving circuit, 7. warning driving circuit, 8. audible-visual annunciator, 9. in-phase amplifier one, and 10. homophase amplifies two, 11. dividers, 12. second order filters, 13. in-phase adders, 14. followers, 15. sampling air chambers, 16. light source ，17. gas accesses, 18. gas vents, 19. measure optical filter, 20. with reference to optical filter, 21. measuring-signal GAS terminals, 22. reference signal REF terminals.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As shown in Figure 2, gas to be measured from gas access 17 enter sampling air chamber 15, from gas vent 18, flow out sampling air chamber 15, the infrared ray that gas sends light source 16 absorbs to some extent, light source through sampling air chamber 15, measure optical filter 19 and with reference to optical filter 20 after from measuring-signal GAS terminal 21 and reference signal REF terminal 22 output two ways of optical signals, i.e. measuring-signal GAS and reference signal REF, as shown in Figure 3, measuring-signal GAS inputs in-phase amplifier 1, reference signal REF inputs in-phase amplifier 2 10, the output signal of in-phase amplifier 1 and in-phase amplifier 2 10 is all input to divider 11, the output signal of divider 11 is input to second order filter 12, the output signal of the output signal of second order filter 12 and differential amplifier 5 is all input to in-phase adder 13, the output signal of in-phase adder 13 is input to follower 14, the output terminal of follower 14 is connected to high-performance, an I/O port of low-power dissipation SOC module J N5139 type wireless microcontroller 1, as shown in Figure 1, infrared gas sensor 2 adopts infrared absorption type gas sensor IR32BC, its signal input part is connected to an I/O port of wireless microcontroller 1 through light source driving circuit 6, the sampled signal of infrared gas sensor 2 outputs is connected to an I/O port of wireless microcontroller 1, that I/O port that in Fig. 3, follower 14 connects through signal conditioning circuit 3, as shown in Figure 4, temperature sensor 4 adopts silicon diode, and its sampled signal is connected to an input end of in-phase adder 13 in signal conditioning circuit 3 after differential amplifier 5, realizes ambient temperature compensation, audible-visual annunciator 8 is connected to an I/O port of wireless microcontroller 1 by warning driving circuit 7.
In Fig. 4-Fig. 9, amplifier model is OP07, and divider 11 is realized ratio computing, and according to Lambert-Beer's law, two paths of signals is all directly proportional to current light intensity, supposes that the scale factor of two paths of signals passage is respectively k
1and k
2, for gasmetry signal: GAS ∝ k
1i
0e
-aCL, for reference signal: REF ∝ k
2i
0, wherein, I
0represent the transmitted light intensity after gas absorption, a represents absorption coefficient, and C represents gas concentration to be measured, and L represents optical path length, the active path length that light passes in gas to be measured.Because light intensity is difficult to Measurement accuracy, in order to eliminate the impact of the light intensity factor, measuring-signal GAS and reference signal REF are asked to ratio, thereby eliminated the impact of light source, improved the accuracy of measuring.The output signal input second-order low-pass filter 12 of divider 11, the output signal input in-phase adder 13 of second-order low-pass filter 12, and realizes additive operation from the signal of temperature sensor differential amplifier 5, the error that compensation temperature is brought.
Claims (4)
1. a methane content WSN sensor node apparatus, comprise infrared gas sensor and signal conditioning circuit thereof, light source driving circuit, audible-visual annunciator and warning driving circuit and wireless microcontroller, infrared gas sensor is connected with the light source in infrared gas sensor, light source driving circuit, signal conditioning circuit and warning driving circuit are connected to an I/O port of wireless microcontroller respectively, it is characterized in that:
Also comprise the temperature sensor being placed in described infrared gas sensor, temperature sensor is connected to signal conditioning circuit by differential amplifier.
2. methane content WSN sensor node apparatus according to claim 1, is characterized in that:
Described infrared gas sensor comprises that sampling air chamber is positioned at the light source of sampling on air chamber one inwall with stretching in sampling air chamber, on sampling air chamber one sidewall, be respectively equipped with gas access and outlet, another is provided with measurement optical filter with the inwall of light source place inwall symmetry and with reference to optical filter sampling air chamber, light source is exported measuring-signal GAS after measuring optical filter, and light source is exported reference signal REF after by reference to optical filter.
3. methane content WSN sensor node apparatus according to claim 2, is characterized in that:
Described signal conditioning circuit comprises in-phase amplifier one, in-phase amplifier two, divider, second order filter, in-phase adder and follower, described measuring-signal GAS is connected to the input end of in-phase amplifier one, described reference signal REF is connected to the input end of in-phase amplifier two, the output terminal of in-phase amplifier one and in-phase amplifier two is all connected to the input end of divider, the output terminal of divider is connected to the input end of second order filter, the output terminal of second order filter and the output terminal of described differential amplifier are connected respectively to two input ends of in-phase adder, the output terminal of in-phase adder is connected to the input end of follower, the output terminal of follower is connected to an I/O port of described wireless microcontroller.
4. methane content WSN sensor node apparatus according to claim 1, is characterized in that:
Described temperature sensor is silicon diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320399140.1U CN203396701U (en) | 2013-07-05 | 2013-07-05 | Sensor node device for methane content WSN (wireless sensor network) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320399140.1U CN203396701U (en) | 2013-07-05 | 2013-07-05 | Sensor node device for methane content WSN (wireless sensor network) |
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| Publication Number | Publication Date |
|---|---|
| CN203396701U true CN203396701U (en) | 2014-01-15 |
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ID=49908225
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320399140.1U Expired - Fee Related CN203396701U (en) | 2013-07-05 | 2013-07-05 | Sensor node device for methane content WSN (wireless sensor network) |
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| Country | Link |
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| CN (1) | CN203396701U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135264A (en) * | 2014-07-08 | 2014-11-05 | 郑州创威煤安科技有限公司 | Positive feedback processing circuit for processing of methane gas sensor signals |
| CN111398203A (en) * | 2020-03-24 | 2020-07-10 | 中煤科工集团重庆研究院有限公司 | Low-power consumption methane detection device and method |
-
2013
- 2013-07-05 CN CN201320399140.1U patent/CN203396701U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135264A (en) * | 2014-07-08 | 2014-11-05 | 郑州创威煤安科技有限公司 | Positive feedback processing circuit for processing of methane gas sensor signals |
| CN111398203A (en) * | 2020-03-24 | 2020-07-10 | 中煤科工集团重庆研究院有限公司 | Low-power consumption methane detection device and method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140115 Termination date: 20160705 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |