CN104820110A - Wind velocity monitoring system based on wireless sensor network - Google Patents
Wind velocity monitoring system based on wireless sensor network Download PDFInfo
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- CN104820110A CN104820110A CN201510217629.6A CN201510217629A CN104820110A CN 104820110 A CN104820110 A CN 104820110A CN 201510217629 A CN201510217629 A CN 201510217629A CN 104820110 A CN104820110 A CN 104820110A
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- platinum resistance
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Abstract
The invention discloses a wind velocity monitoring system based on a wireless sensor network. The wind velocity monitoring system comprises a convergent center, a monitoring center, and a plurality of wireless sensor networks formed by a plurality of sensor nodes. The sensor nodes contain platinum-contained resistors; the platinum-contained resistors are provided with micro controller modules, current detection modules, display modules, and power supply modules, wherein the current detection modules, the display modules, and the power supply modules are connected with the micro controller modules; and the micro controller modules consist of calculation units, comparison units, and control units. According to the invention, Hall current sensors are used for detecting currents of the platinum-contained resistors in real time and calculating temperature differences between the surrounding environment temperatures and the temperatures of the resistors, thereby obtaining the air velocity precisely.
Description
Technical field
The present invention relates to a kind of air velocity pick-up unit, particularly relate to a kind of wind speed supervisory system based on wireless sensor network, belong to wind speed measurement control field.
Background technology
Wind speed measurement the numerous areas such as environmental protection meteorology, commercial unit, mining safety, health care all tool be of great significance.Along with the development of China's wind-power electricity generation cause, the progress of detection technique and people are to the raising of environmental requirement, people to the measuring accuracy of detecting instrument and the requirement of function more and more higher.Air velocity transducer is the sensor for measuring speed air flow.Air velocity transducer can be used as the air flow sensor of the Boiler pressure control sensor and automobile and so on of air-conditioning system.In addition, it also causes the concern of people as the indispensable sensor of wind tunnel experiment in fluid mechanics and aerodynamic scope.
At numerous areas such as environmental protection meteorology, household electrical appliance, commercial unit, health cares, air velocity is all an important detected parameters, and particularly at society, the household electrical appliance such as various fan, air-conditioning enter family, office and public place in a large number.Based on above reason, the present invention devises a kind of wind speed measuring circuit of measuring wind, and it has, and cost is low, easy to use, measuring accuracy comparatively high, and can with other integrated chips such as single-chip microcomputer with the use of and become the application circuit of other system.
Such as application number is a kind of wind speed measuring sensor of " 201210492818.0 ", comprise the base that hollow is arranged, the cover plate being arranged on described base top and the vane cover be sleeved on described base, described chassis interior is provided with the transmission shaft be fixedly connected with the geometric center position of described vane cover, described chassis interior is provided with head bearing for supporting described transmission shaft and lower bearing, the locating sleeve be sleeved on described transmission shaft is provided with between described head bearing and lower bearing, the bottom outer wall of described transmission shaft is provided with magnet piece, the inwall of described base is provided with magnetic sensor, described magnetic sensor and described magnet piece are positioned on same level line, the two ends of described vane cover are symmetrically arranged with two vanes.This invention structure is simple, reasonable in design, and processing and fabricating is convenient, and use simple operation, highly sensitive, realize cost low, long service life, practical, result of use is good, be convenient to promote the use of, but measuring technique needs to be further improved.
And for example application number is the hot grating wind speed wind direction sensor of platinum of " 201310108380.6 ", comprise platinum filament, heat insulation basalis, transition bed, coating layer and sheet metal lead-in wire, wherein heat insulation basalis connection bonding with transition bed, platinum filament is coiled into four independently grid silk structure a, b, c, d is also bonded on transition bed, four two grid silk structure a independently in grid silk structure, b is horizontal, two other grid silk structure c, d vertically arranges, and grid silk structure a, the line of b and grid silk structure c, the line of d is orthogonal, platinum filament lead-in wire goes between with sheet metal and is welded to connect, coating layer is bonded on transition bed, this invention sensor is used for the measurement of wind speed and direction, there is volume little, quality is light, precision is high, long-life, feature simple and reliable for structure.But measuring accuracy needs to be improved further.
Summary of the invention
Technical matters to be solved by this invention provides for the deficiency of background technology the wind speed supervisory system based on wireless sensor network that a kind of cost is low, easy to use, measuring accuracy is higher.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of wind speed supervisory system based on wireless sensor network, the multiple wireless sensor networks comprising convergence center, Surveillance center and be made up of multiple sensor node, described sensor node comprises platinum resistance, the current detection module, display module and the power module that described platinum resistance are provided with micro controller module and are connected with micro-control module, described micro controller module comprises computing unit, contrast unit and control module;
Wherein, current detection module, for detecting the electric current that platinum resistance circulates in real time;
Platinum resistance, for detecting platinum resistance ambient temperature and platinum resistance own temperature in real time;
Computing unit, the electric current circulated in the own temperature according to the platinum resistance detected, platinum resistance and platinum resistance ambient temperature calculate wind speed, are specifically calculated as follows:
Wherein, V is air velocity, I
hfor the electric current that resistance circulates, R
hfor the resistance of platinum resistance, T
hfor platinum resistance own temperature, T
jfor platinum resistance ambient temperature, C is convection transfer rate, A be platinum resistance to flow area;
Contrast unit, contrasts for the wind speed that calculated by computing unit and normality threshold, if exceed normality threshold, increases survey frequency by control module, if do not exceed normality threshold, reduce survey frequency by control module;
Display module, for showing the wind speed that computing unit calculates in real time.
As the further preferred version of a kind of wind speed supervisory system based on wireless sensor network of the present invention, described micro controller module adopts AVR series monolithic.
As the further preferred version of a kind of wind speed supervisory system based on wireless sensor network of the present invention, described display module is LCD display.
As the further preferred version of a kind of wind speed supervisory system based on wireless sensor network of the present invention, the model of described platinum resistance is Ptl00.
As the further preferred version of a kind of wind speed supervisory system based on wireless sensor network of the present invention, described current detection module adopts Hall current sensor.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1, cost of the present invention is low, easy to use and measuring accuracy is higher;
2, sensor node of the present invention forms the wireless sensor network of multi-hop, self-organization by communication, and this ad hoc capability is strong, can real-time synchronization to parameters Real-Time Monitoring in tunnel
3, the present invention detects the electric current of platinum resistance in real time by adopting Hall current sensor and calculates the temperature difference of platinum resistance ambient temperature and own temperature, and then obtains air velocity and wind speed accurately;
4, the present invention reasonably can utilize sensor node, can effective saves energy.
Accompanying drawing explanation
Fig. 1 is sensor node structure principle chart of the present invention;
Fig. 2 is system architecture schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
As shown in Figure 2, a kind of wind speed supervisory system based on wireless sensor network, the multiple wireless sensor networks comprising convergence center, Surveillance center and be made up of multiple sensor node, as shown in Figure 1, described sensor node comprises platinum resistance, the current detection module, display module and the power module that described platinum resistance are provided with micro controller module and are connected with micro-control module, described micro controller module comprises computing unit, contrast unit and control module;
Wherein, current detection module, for detecting the electric current that platinum resistance circulates in real time;
Platinum resistance, for detecting platinum resistance ambient temperature and platinum resistance own temperature in real time;
Computing unit, the electric current circulated in the own temperature according to the platinum resistance detected, platinum resistance and platinum resistance ambient temperature calculate wind speed, are specifically calculated as follows:
Wherein, V is air velocity, I
hfor the electric current that resistance circulates, R
hfor the resistance of platinum resistance, T
hfor platinum resistance own temperature, T
jfor platinum resistance ambient temperature, C is convection transfer rate, A be platinum resistance to flow area;
Contrast unit, contrasts for the wind speed that calculated by computing unit and normality threshold, if exceed normality threshold, increases survey frequency by control module, if do not exceed normality threshold, reduce survey frequency by control module;
Display module, for showing the wind speed that computing unit calculates in real time.
Wherein, described micro controller module adopts AVR series monolithic, and described display module is LCD display, and the model of described platinum resistance is Ptl00, and described current detection module adopts Hall current sensor.
Wind speed measurement the numerous areas such as environmental protection meteorology, commercial unit, mining safety, health care all tool be of great significance.Along with the development of China's wind-power electricity generation cause, the progress of detection technique and people are to the raising of environmental requirement, people to the measuring accuracy of detecting instrument and the requirement of function more and more higher.Air velocity transducer is the sensor for measuring speed air flow.Air velocity transducer can be used as the air flow sensor of the Boiler pressure control sensor and automobile and so on of air-conditioning system.In addition, it also causes the concern of people as the indispensable sensor of wind tunnel experiment in fluid mechanics and aerodynamic scope.
At numerous areas such as environmental protection meteorology, household electrical appliance, commercial unit, health cares, air velocity is all an important detected parameters, and particularly at society, the household electrical appliance such as various fan, air-conditioning enter family, office and public place in a large number.Based on above reason, the present invention devises a kind of wind speed measuring circuit of measuring wind, and it has, and cost is low, easy to use, measuring accuracy comparatively high, and can with other integrated chips such as single-chip microcomputer with the use of and become the application circuit of other system.
Fluid is placed in by the object heated, thermal loss mainly heat radiation and the thermal convection of this object when one.Lower in temperature, in the negligible situation of heat loss through radiation, the heat of object transmits mainly thermal convection.When the speed of fluid increases, the thermal loss of object also increases.If to electrically to platinum resistance thermometer sensor, heating, so platinum resistance thermometer sensor, will reach one by the determined equilibrium temperature of rate of flow of fluid.
We adopt platinum resistance thermometer sensor, as heating target.Change due to temperature causes the change of the resistance of platinum resistance thermometer sensor, own, thus can be set up the mathematical model of fluid velocity and bridge circuit output voltage by bridge circuit.Utilize this principle to carry out the measurement of wind speed.
AVR single chip has prefetched instruction function, namely when an execution instruction, in advance next instruction is got into, and call instruction can be performed within a clock period; Multiple accumulator type, data processing speed is fast; AVR single chip has 32 general purpose working registers, and being equivalent to has 32 viaducts, can fast passing; Response time is fast.AVR single chip has multiple fixing interrupt vector entry address, can respond interruption fast; AVR single chip power consumption is low.For typical power consumption situation, be 100nA when WDT closes, be more suitable for battery powered application apparatus; The minimum 1.8V of some devices gets final product work; AVR single chip security performance is good.
Micro controller module of the present invention, the electric current circulated in the own temperature according to the platinum resistance detected, platinum resistance and platinum resistance ambient temperature calculate air velocity, are specifically calculated as follows:
as can be seen from formula, when platinum resistance ambient temperature and own temperature do not exist temperature difference, can show that 1/4 power of electric current and wind speed is directly proportional when thermal resistance temperature and environment temperature one timing easily.
Cost of the present invention is low, easy to use and measuring accuracy is higher; Sensor node of the present invention forms the wireless sensor network of multi-hop, self-organization by communication, this ad hoc capability is strong, can real-time synchronization to parameters Real-Time Monitoring in tunnel, the present invention detects the electric current of platinum resistance in real time by adopting Hall current sensor and calculates the temperature difference of platinum resistance ambient temperature and own temperature, and then obtains air velocity and wind speed accurately; The present invention reasonably can utilize sensor node, can effective saves energy.
Those skilled in the art of the present technique are understandable that, unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the present invention.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.By reference to the accompanying drawings embodiments of the present invention are explained in detail above, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, makes a variety of changes under can also or else departing from the prerequisite of present inventive concept.
Claims (5)
1. the wind speed supervisory system based on wireless sensor network, it is characterized in that: the multiple wireless sensor networks comprising convergence center, Surveillance center and be made up of multiple sensor node, described sensor node comprises platinum resistance, the current detection module, display module and the power module that described platinum resistance are provided with micro controller module and are connected with micro-control module, described micro controller module comprises computing unit, contrast unit and control module;
Wherein, current detection module, for detecting the electric current that platinum resistance circulates in real time;
Platinum resistance, for detecting platinum resistance ambient temperature and platinum resistance own temperature in real time;
Computing unit, the electric current circulated in the own temperature according to the platinum resistance detected, platinum resistance and platinum resistance ambient temperature calculate wind speed, are specifically calculated as follows:
Wherein, V is air velocity, I
hfor the electric current that resistance circulates, R
hfor the resistance of platinum resistance, T
hfor platinum resistance own temperature, T
jfor platinum resistance ambient temperature, C is convection transfer rate, A be platinum resistance to flow area;
Contrast unit, contrasts for the wind speed that calculated by computing unit and normality threshold, if exceed normality threshold, increases survey frequency by control module, if do not exceed normality threshold, reduce survey frequency by control module;
Display module, for showing the wind speed that computing unit calculates in real time.
2. a kind of wind speed supervisory system based on wireless sensor network according to claim 1, is characterized in that: described micro controller module adopts AVR series monolithic.
3. a kind of wind speed supervisory system based on wireless sensor network according to claim 1, is characterized in that: described display module is LCD display.
4. a kind of wind speed supervisory system based on wireless sensor network according to claim 1, is characterized in that: the model of described platinum resistance is Ptl00.
5. a kind of wind speed supervisory system based on wireless sensor network according to claim 1, is characterized in that: described current detection module adopts Hall current sensor.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105628961A (en) * | 2015-12-29 | 2016-06-01 | 河海大学 | Flow velocity measurement system based on sensor network |
| CN106018875A (en) * | 2016-07-22 | 2016-10-12 | 无锡信大气象传感网科技有限公司 | Atmospheric environment wind speed monitoring system |
| CN106018874A (en) * | 2016-07-22 | 2016-10-12 | 无锡信大气象传感网科技有限公司 | Environmental wind speed monitoring system based on filter circuit and power supply controller |
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| US20030219062A1 (en) * | 2002-05-21 | 2003-11-27 | Egidio Paul B. | System and method for temperature sensing and monitoring |
| CN101526412A (en) * | 2009-03-26 | 2009-09-09 | 浙江大学 | Wind speed and pressure wireless detecting system of space structure building powered by solar energy |
| CN103874117A (en) * | 2014-04-01 | 2014-06-18 | 国家电网公司 | Method and system for detecting equipment cabinet environment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105628961A (en) * | 2015-12-29 | 2016-06-01 | 河海大学 | Flow velocity measurement system based on sensor network |
| CN106018875A (en) * | 2016-07-22 | 2016-10-12 | 无锡信大气象传感网科技有限公司 | Atmospheric environment wind speed monitoring system |
| CN106018874A (en) * | 2016-07-22 | 2016-10-12 | 无锡信大气象传感网科技有限公司 | Environmental wind speed monitoring system based on filter circuit and power supply controller |
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Application publication date: 20150805 |
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