CN102147290A - Infrared imaging temperature-monitoring method and system - Google Patents
Infrared imaging temperature-monitoring method and system Download PDFInfo
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- CN102147290A CN102147290A CN2011100085186A CN201110008518A CN102147290A CN 102147290 A CN102147290 A CN 102147290A CN 2011100085186 A CN2011100085186 A CN 2011100085186A CN 201110008518 A CN201110008518 A CN 201110008518A CN 102147290 A CN102147290 A CN 102147290A
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Abstract
The invention discloses an infrared imaging temperature-monitoring system. The system comprises a measuring unit, a transmitting unit and a centralized control unit, wherein the measuring unit comprises one or more infrared thermal imager probes and is used for capturing infrared imaging data of an object to be monitored, the positions and directions of the infrared thermal imager probes are fixed, and the object to be monitored is completely covered by the infrared thermal imager probes; the transmitting unit is used for transmitting the measured data captured by the measuring unit to the centralized control unit; and the centralized control unit comprises a data processing subunit and an integration application subunit, the data processing subunit generates and maintains temperature information of the object to be monitored according to the measured data transmitted by the transmitting unit, and the integration application subunit provides application for a user to use the temperature information for monitoring. The invention also relates to a monitoring method using the system. The invention can monitor the object in an all-around way, in real time and uninterruptedly and is suitable for on-line monitoring in the places such as transformer stations, power stations and the like.
Description
Technical field
The present invention relates to a kind of temperature monitoring method and system, belong to the infrared thermal imaging technique field based on infrared imaging.
Background technology
All objects all to around radiated electromagnetic wave, its electromagnetic wavelength has covered whole electromagnetic wave spectrum continuously, but emittance mainly concentrates near the centre wavelength.The temperature of centre wavelength and object has relation, and the absolute temperature of its value and object (thermodynamic temperature) is inversely proportional to.Celsius temperature is-50 ~ 100 ℃ a object, and the centre wavelength of radiation is positioned at the scope of 8 ~ 14 μ m, belongs to Infrared, so be commonly called infrared emanation, is called for short heat radiation.
Thermal infrared imager is to change the sightless infrared emanation of these human eyes into human eye visible thermographic equipment.Its principle of work is, the infrared emanation that absorbs is changed into heat, causes that the pixel of infrared focal plane array in the thermal imaging system heats up, and then the change in electric that temperature rise causes is outputed in the display device.Temperature rise difference, the change in electric that causes are also different.After the thermometric algorithm process, give different false colours at different numerical value, on the display screen of thermal imaging system, demonstrate the Temperature Distribution of target by the difference of color, also can directly demonstrate the concrete numerical value of temperature.The thermal infrared imager that can realize temp sensing function is called as infrared thermometer.
Be subjected to the influence of two aspect factors with the temperature of infrared thermometer Measuring Object, one is the radiance of target object, and one is the distance of target and temperature measurer.The height of emittance is not only relevant with the object surfaces temperature, and is also relevant with the radiant power of object.This radiant power indicates with a parameter radiance (also claiming emissivity or grey hierarchy number) ε usually.Radiance is the cardinar number of a no unit, and span is 0 ~ 1.Two objects that size shape is the same, also identical even temperature is identical apart from the distance of temperature measurer, if but the radiance difference, then the energy toward external radiation is also inequality in the unit interval.Be reflected on the temperature measurer, these two objects that actual temperature is identical, the temperature of measuring is different.On the other hand, same object, when temperature measurer is far away and in the time of near, the temperature of measuring is also not necessarily identical.Therefore, thermometric accurately be realized, the approximate distance of target and thermal imaging system and the radiance of body surface need be known in advance.Radiance and in fact limited the range of application of infrared thermometer apart from these two factors.
Along with the development of modern electric power industry towards voltage levels, vast capacity, electric system has proposed more and more higher requirement to safe and reliable operation, its developing direction is to adopt on-line monitoring and diagnostic techniques, obtain equipment running status in real time, to reach the purpose of the timely discovery potential faults and the symptom of a trend.Warm along with the development of artificial intelligence technology and novel sensor, computer technology, the information processing technology, the particularly development of High-Voltage Insulation on-line monitoring technique, infrared thermal imaging technique is carried out the automatic safe detection to transformer station and is become possibility under situation about not having a power failure.
On-line monitoring technique and infrared thermal imaging technique are organically combined, can provide desirable solution for the work such as repair based on condition of component, safe operation monitoring and unattended operation transformer station of high voltage installation, new " charging equipment infrared diagnostics using standard DL/T664-2008 " is also specially to having proposed specific requirement in line style infrared thermal imagery system.
Because infrared thermal imaging detects and mostly adopts portable thermal imaging system operation detection at present, heat picture to storage often needs off-line importing PC to carry out analyzing and diagnosing, therefore can only realize the monitoring analysis of discontinuity, can not realize that this tends to occasion a delay and causes greater loss to the real-time monitoring of heat distribution field with to the real-time diagnosis of thermal imagery nature of trouble.To some special occasions such as unattended operation transformer station,, tend to bring the lifting of hand labor intensity and diagnose defectives such as untimely in addition if adopt portable thermal imaging system.Therefore, though present thermal infrared imager has obtained the application of comparatively popularizing in power industry,, still can't realize work convenience and control real-time based on needing the manually-operated this point all the time.
Use The Cloud Terrace can by stepper motor change thermal infrared imager towards, realize covering large-scale purpose, but in the acquisition space advantage, sacrificed temporal continuity with a small amount of thermal infrared imager.Because the field angle of thermal imaging system has only 20 ~ 40 ° usually, the scope that needs to cover then often is the doubly a lot of of field angle, therefore uses the auxiliary thermal imaging system of The Cloud Terrace a certain zone in the covering space by phased manner, can not satisfy the requirement of real-time.
Under this background, strong in the industry hope has a kind of intelligentized infrared thermal imagery on-line monitoring system, can realize remote control operation.
The invention provides a kind of temperature monitoring system based on infrared imaging, under the help of this system, the staff can be in the monitoring chamber the real-time duty of each equipment in monitoring objective such as the transformer station.System carries out real-time analysis and storage to various information, reports to the police automatically during unusual circumstance, also can control the running status of converting equipment if necessary automatically.Superior unit also can enter the infrared thermal imagery temperature monitoring system by internet or LAN (Local Area Network), in time grasps the ruuning situation of transformer station easily.
Summary of the invention
The problem of real-time and integrality be can not take into account simultaneously in order to solve existing thermometry and equipment, a kind of new temp measuring method and system the present invention proposes.This system use one or more fixed positions and towards thermal infrared imager, cover measured target fully with various visual angles, utilize the infrared emanation of measured target to carry out contactless temperature-measuring, the temperature of being surveyed shows by the three-dimensional model of video image and measured target, is suitable for the monitor staff and monitors intuitively and analyze.
According to an aspect of the present invention, provide a kind of temperature monitoring system, having comprised based on infrared imaging:
Measuring unit comprises one or more infrared thermal imagery instrument probes, is used to catch monitored target infrared imaging data, the position of wherein said infrared thermal imagery instrument probe and towards fixing, and it arranges the described monitored target of all standing;
Transmission unit is used for being transferred to collection control unit by the measurement data that network is caught described measuring unit; And
Collection control unit, comprise data processing subelement and integrated application subelement, the measurement data that described data processing subelement transmits according to described transmission unit generates and safeguards the temperature information of described monitored target, and described integrated application subelement provides to be used so that the user is used for monitoring with described temperature information.
According to another aspect of the present invention, provide a kind of temperature monitoring method, comprised step based on infrared imaging:
Arrange one or more positions and towards fixing infrared thermal imagery instrument probe, to cover monitored target fully;
Catch described monitored target infrared imaging data;
By the described infrared imaging data of Network Transmission for subsequent treatment;
Generate and safeguard the temperature information of described monitored target according to described infrared imaging data; And
Provide application to monitor to utilize described temperature information.
With respect to prior art, advantage of the present invention is:
1. integrality.Thermal infrared imager by right quantity is set and visible light camera probe towards and the position, measured zone is covered fully.
2. continuous.Since thermal infrared imager and visible light camera probe towards fixing with the position, therefore can be to realization of goal continual monitoring in 24 hours or measurement.
3. real-time.After by network measurement data being real-time transmitted to collection control unit, show at once, realize on-line monitoring.
4. noncontact.Thermal infrared imager and visible light camera probe wide can not have influence on the working environment of target.
Description of drawings
Come in conjunction with the drawings can obtain better understanding to principle of the present invention, feature and advantage with reference to hereinafter to the description of specific embodiment.Identical or corresponding label is represented corresponding or identical part in the accompanying drawing:
Fig. 1 is the schematic diagram according to infrared imaging temperature monitoring system of the present invention.
Fig. 2 is according to an embodiment of the invention, is used for the principle of work synoptic diagram of the visible light-infrared binary channel probe of infrared imaging temperature monitoring system.
Fig. 3 is the schematic diagram according to the collection control unit of infrared imaging monitoring system of the present invention.
Fig. 4 is according to an embodiment of the invention, the synoptic diagram that utilizes visible light camera and thermal infrared imager binary channel probe that 110kV transformer station is monitored.
Fig. 5 is the indicative flowchart according to infrared imaging temperature monitoring method of the present invention.
Embodiment
With reference to figure 1, show schematic diagram according to infrared imaging temperature monitoring system of the present invention.As shown in the figure, this system comprises measuring unit 10, network 20 and collection control unit 30.
Fig. 2 shows the structural drawing according to a binary channel measuring sonde of the present invention.As shown in the figure, this measuring sonde 110 comprises two measurement paths, is respectively infrared thermal imagery instrument probe 110a and visible light camera probe 110b.For example, this measuring sonde 110 can adopt the all-in-one of visible light camera and thermal infrared imager, it comprises thermal infrared imager and the visible light camera consistent with its field angle, the optical axis of visible light camera is adjacent with the optical axis of thermal infrared imager and parallel, the signal output port of visible light camera links to each other with the signal output port of thermal infrared imager, all exports signal processing circuit 120 to.
Infrared thermal imagery instrument probe 110a is made up of optical system and scanning system, infrared eye etc.Monitored target infrared radiation is converged, filtering, is focused on the infrared eye through optical system, again by optics--mechanical scanning system (advanced at present focal plane technology has then been saved the optical mechaical scanning system) is arranged the infrared flux of each point on the object inspection surface in chronological order, change electric pulse into through infrared eye, transfer to signal processing circuit 120 via internal wiring.Visible light camera 110b for example is the part (signal processing is integrated in the signal processing circuit 120) of traditional ccd video camera, is made of ccd image sensor, clock driver circuit.Monitored target images on the photosurface of ccd image sensor through Liar, produces the image of charge packet intensity distributions.Clock driver circuit partly produces the vertical and horizontal clock in each required road of CCD, provides CCD to shift required large load current, to realize that ccd signal correctly extracts, produces synchronous signals such as the required composite sync of signal processing circuit 120 and composite blanking pulse.
The signal that signal processing circuit 120 can be respectively transmits infrared thermal imagery instrument probe 110a and visible light camera probe 110b is handled.On the one hand, it amplifies infrared original signal and processing such as conversion; On the other hand, its can amplify the CCD original signal, clamp, sampling and Combined Processing.At last, signal processing circuit 120 is controlled unit 30 by Network Transmission to collection with treated infrared signal and ccd signal.
In addition, as previously mentioned, can integrated ethernet controller and transceiving chip on the treatment circuit plate of measuring sonde inside, can realize the 100 m ethernet data transmission.The data of each road probe arrive gigabit ethernet switch by optical fiber, and the server of being controlled the unit by collection reads.
Be appreciated that measuring unit can use thermal infrared imager unipath probe in order to realize testing goal of the present invention.Infrared thermography is that the infrared emanation with passive receiving target self comes imaging, day and night no matter, all can be in running status in 24 hours and operate as normal is particularly descended also and can be monitored in harsh climate conditions such as rain, mists.Because wavelength of visible light is short, the ability that overcomes obstacles, thereby observation effect is poor.And be operated in the LONG WAVE INFRARED thermal imaging system of 8～14 mum wavelengths, and its ability that penetrates rain, mist is higher, thus observed object normally still.Therefore, thermal infrared imager is widely used in the place of the remote night vision monitoring of needs such as frontier defense, coast defence, military installations safety precaution, circumference invasion, critical facility, forest fire protection, oil field are antitheft, public security patrol, can realize continual monitoring in 24 hours.
But,,, can realize the synchronous shooting of visible light camera and thermal infrared imager by visible light camera and the structural cooperation of thermal infrared imager if use visible light camera and thermal infrared imager binary channel probe.The user can carry out the analysis of infrared image with reference to visible images, thereby on the basis of the face shaping of intuitively, clearly understanding subject, infrared image is carried out more accurate analysis.
Fig. 3 shows the synoptic diagram according to the collection control unit of infrared imaging monitoring system of the present invention.Collection control unit 30 comprises data processing subelement 310 and integrated application subelement 320.Wherein, data processing subelement 310 further comprises thermometric algoritic module 311 and database 312.310 pairs of infrared/digital of digital video data from probe of thermometric algoritic module carry out computing, the thermometric mode that provides according to integrated application subelement is provided with, finish functions such as a thermometric, 2 differential temperature surveys, line thermometric, regional thermometric, obtain the temperature information of measured target, call for integrated application subelement.Another major function of data processing subelement 310 is to utilize database 312 storage and the management data from thermometric algoritic module 311, and, realize such as the user's operation that increases real time data, enquiry of historical data, modification data with existing and backup significant data etc. in conjunction with each module of integrated application subelement 320.
When utilizing thermal infrared imager unipath probe, three-dimensional artificial module 321 presents the temperature information of each position on monitored Three-dimension Target model.When-visible light binary channel infrared when utilizing popped one's head in, three-dimensional artificial module 321 was except being integrated into temperature information on the three-dimensional model, and also the real-time video that the visible light camera probe is collected corresponds to each concrete surface location on the three-dimensional model.When concrete the demonstration, the location point temperature information and the video information that the measurement data of being obtained by measuring unit can be obtained are mapped on the equatorial projection relevant position of three-dimensional stereo model and mark.Can be directly on three-dimensional model, wait to indicate temperature, also can work as pointer such as cursor and hover in certain position or during scope, show the temperature and the real-time video of this position with the form that ejects the remarks frame with the false color of difference.In a preferred embodiment, can rotate as required and the convergent-divergent three-dimensional model, so that multi-angle, watch monitored target at many levels.At this moment, when being in certain visual angle and watching three-dimensional model, can switch between infrared view and video views, each view is spliced by the video image and the infrared image of a plurality of probes that real-time calling obtains.
Alarm module 322 is set up the normal temperature parameter area of each position of monitored target in advance, and produces warning message when any position Current Temperatures reaches predetermined threshold with respect to the temperature difference of its normal temperature range.For example, in the example of electrical substation monitoring, under the situation of the normal operation of transformer station, the normal temperature parameter of gathering each equipment is set up normal working temperature benchmark and alarm threshold value.Reach a certain amount of in case monitor the amount that the temperature of any equipment reaches alarm threshold value or depart from this normal working temperature benchmark, just generate warning message.Alarm module can be by sounding, eject dialog box, sending directly these abnormal conditions of interactive mode notice monitoring personnel such as short message and Email, and can when calling the demonstration of surveillance map picture, the monitoring personnel highlight position of failure point by forms such as specific markers, particular color, sound or flickers.Further, pointer such as cursor be can also work as when resting on position of failure point, current temperature value and the normal temperature value that is used to contrast shown.In a preferred embodiment, can also wait by different specific markers, shade, volume, flicker frequency and represent that Current Temperatures departs from the intensity grade of normal range.
Other modules 323 are for example on the basis of data integration and three-dimensional modeling, the monitoring video image is represented to the user, and carry out the demonstration of various data processed result according to user's operation, finish following major function: image demonstration, temperature analysis, generate and check report and system comissioning etc.According to user's different demands, these other modules can be expanded accordingly.
Fig. 4 shows according to an embodiment of the invention, the synoptic diagram that utilizes visible light camera and thermal infrared imager binary channel probe that 110kV transformer station is monitored or measures.
The scope of transformer station can roughly be considered as the zone of the high 10m of the wide 20m of long 30m.In this zone, need the target of monitoring that main transformer electricity cabinet, lightning arrester, insulator, wire clamp or the like are arranged.These targets that need monitoring are all apart from more than the 1.6m of ground.Do not need the object of monitoring 1.6m below be cement pedestal, electric pole etc.So the zone of actual needs monitoring is apart from ground 1.6m place, the zone of the high 8.4m of the wide 20m of long 30m.
The field angle of infrared probe is 40.5 ° * 31.3 °.According to these conditions, need 6 probes altogether, place camera as follows, can realize comprehensive covering:
1-2 number the probe: place the mid point on wide 20m limit, the height 5m, level towards.
3-6 number the probe: place the trisection point on long 30m limit, the height 5m, level towards.
Aforesaid laying method only is a simple design.During concrete enforcement, also need to consider monitored target occlusion effect each other, so the position of camera and adjusted towards all needing, make target stagger mutually.In addition, some target may need monitoring even overlapping monitoring separately, therefore can increase the quantity of camera.Therefore, this scheme needs the detailed information of monitoring objective in the area to be monitored, comprises position, size, radiance etc.
Fig. 5 shows the process flow diagram that is used to realize the method for infrared imaging monitoring according to of the present invention.At step 501 place, method begins.In step 502, arrange one or more positions and towards fixing infrared thermal imagery instrument probe, to cover monitored target fully.Can be according to the topological structure and the surface condition of monitored target, determine the concrete scheme that probe is provided with, comprise its position, quantity and towards.Unless be used for very regular surface monitoring, otherwise the distribution of these probes is not uniform usually.Setting principle is to make their field angle sum cover the total surface area of monitored target fully.Can arrange one or more visible light camera probes simultaneously, for example replace thermal infrared imager unipath probe by infrared/visible light binary channel probe, wherein visible light camera and thermal infrared imager are in same position, and towards unanimity.
In step 503, catch described monitored target infrared imaging data.By the operation of infrared thermal imagery instrument probe, obtain monitored target infrared imaging data passively.This is caught and is not relied on surround lighting, and is not subjected to Effect of Environmental such as wind, rain, mist.
In step 504, by the described infrared imaging data of Network Transmission for subsequent treatment.As previously mentioned, by wireless or wired mode the measurement data real-time Transmission is controlled the data processing module of unit to collection.
In step 505, generate and safeguard the temperature information of described monitored target according to described infrared imaging data.This mainly is the operation of finishing in the data processing subelement of collection control unit.The thermometric algoritic module of data processing subelement generates temperature information according to the infrared imaging data, and database storing is also managed these temperature datas.
At last, in step 506, provide application to monitor to utilize described temperature information.This mainly is the operation of finishing in the integrated application subelement of collection control unit.Each application module basis purpose of function is separately called data of database in the data processing subelement, data is handled necessarily, thereby finished application functions such as corresponding demonstration, warning, accent survey.Such as, it is typical application example of the present invention that three-dimensional artificial shows.Can utilize the three-dimensional artificial module, the temperature information that mark obtains from database on monitored Three-dimension Target model.And under the situation of utilizing infrared-visible light binary channel probe, the visible light video data that the visible light camera probe can also be gathered is integrated in three-dimensional model.Again for example, warning is another typical application example of the present invention.Can under the situation of the normal operation of transformer station, gather the normal temperature value scope of each equipment or position, set up the associated databases clauses and subclauses.Determine to reach which kind of degree when the temperature departure normal range, equipment can break down, with this bias as alarm threshold value.When actual monitoring, any position Current Temperatures departs from when reaching predetermined threshold with respect to the normal temperature range of its prior preservation, produces automatically and reports to the police.Can notify the monitoring personnel concrete warning message by ejecting modes such as dialog box, Email, short message, chimes of doom, also can call the surveillance map picture the monitoring personnel shows and to highlight position of failure point by forms such as specific markers, particular color, sound or flickers when showing as three-dimensional model.
More than the preferred embodiments of the present invention have been carried out nonrestrictive description.It will be appreciated by those skilled in the art that under the situation that does not break away from design of the present invention and scope, can make many other changes and remodeling the present invention.Should be appreciated that to the invention is not restricted to described specific implementations, scope of the present invention only is defined by the following claims.
Claims (15)
1. monitoring system based on infrared imaging comprises:
Measuring unit comprises one or more infrared thermal imagery instrument probes, is used to catch monitored target infrared imaging data, the position of wherein said infrared thermal imagery instrument probe and towards fixing, and it arranges the described monitored target of all standing;
Transmission unit is used for being transferred to collection control unit by the measurement data that network is caught described measuring unit; And
Collection control unit, comprise data processing subelement and integrated application subelement, the measurement data that described data processing subelement transmits according to described transmission unit generates and safeguards the temperature information of described monitored target, and described integrated application subelement provides to be used so that the user is used for monitoring with described temperature information.
2. system according to claim 1 is characterized in that described transmission unit transmits described measurement data based on wired or wireless mode.
3. system according to claim 1 is characterized in that, described data processing subelement further comprises the thermometric algoritic module, and described thermometric algoritic module is converted to described measurement data the temperature information of monitored target.
4. according to each described system among the claim 1-3, it is characterized in that described data processing subelement further comprises database, the temperature information of the monitored target that the described thermometric algoritic module of described database storing generates.
5. system according to claim 1 is characterized in that, described integrated application subelement further comprises the three-dimensional artificial module, is used for presenting described temperature information based on described monitored Three-dimension Target model.
6. according to each described system among the claim 1-5, it is characterized in that, described measuring unit also comprises one or more visible light camera probes, be used to catch the visual light imaging data of described monitored target, described one or more visible light camera probes are respectively with the position of described one or more infrared thermal imagery instrument probes with towards consistent.
7. according to each described system among the claim 1-6, it is characterized in that, described three-dimensional artificial module also with described visual light imaging data integration in described monitored Three-dimension Target model.
8. according to each described system among the claim 1-7, it is characterized in that, described integrated application subelement further comprises alarm module, described alarm module is set up the normal temperature parameter area of each position of monitored target in advance, and produces warning message when any position Current Temperatures reaches predetermined threshold with respect to the temperature difference of its normal temperature range.
9. system according to claim 8 is characterized in that, described alarm module identifies the temperature anomaly position with specific markers, particular color, sound or flicker.
10. monitoring method based on infrared imaging comprises step:
Arrange one or more positions and towards fixing infrared thermal imagery instrument probe, to cover monitored target fully;
Catch described monitored target infrared imaging data;
By the described infrared imaging data of Network Transmission for subsequent treatment;
Generate and safeguard the temperature information of described monitored target according to described infrared imaging data; And
Provide application to monitor to utilize described temperature information.
11. method according to claim 10 also comprises: present described temperature information based on described monitored Three-dimension Target model.
12. according to claim 10 or 11 described methods, also comprise: arrange one or more visible light camera probes, and catch the visual light imaging data of described monitored target, described one or more video camera can the probe respectively with the position of described one or more infrared thermal imagery instrument probes with towards consistent.
13. method according to claim 12 also comprises: with described visual light imaging data integration in described monitored Three-dimension Target model.
14. according to each described method among the claim 10-13, also comprise: set up the normal temperature parameter area of each position of monitored target in advance, and when any position Current Temperatures reaches predetermined threshold with respect to the temperature difference of its normal temperature range, produce warning message.
15. system according to claim 14 is characterized in that, identifies the temperature anomaly position with specific markers, particular color, sound or flicker.
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