CN105352988A - System for evaluating thermal insulation performance of exterior wall of building and method thereof - Google Patents
System for evaluating thermal insulation performance of exterior wall of building and method thereof Download PDFInfo
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- CN105352988A CN105352988A CN201510701998.2A CN201510701998A CN105352988A CN 105352988 A CN105352988 A CN 105352988A CN 201510701998 A CN201510701998 A CN 201510701998A CN 105352988 A CN105352988 A CN 105352988A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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Abstract
The invention relates to a system for evaluating thermal insulation performance of an exterior wall of building based on an infrared temperature-test technology and a method thereof. The evaluation system comprises a planar array infrared image detector, a planar array visible light image detector, an infrared lens, a visible light lens, an image acquisition and processing module, and an image display and control module. According to the invention, characteristics of intelligibility of visible light image edge and sensitivity of temperature change by the infrared image are combined, and data fusion on two wave band images can be carried out. By using a set image segmentation algorithm, area partition on different material parts (such as window and door) in the visible light images of a building to-be-evaluated can be carried out; then, emissivity database of various common building materials stored in the system or on-site representative point can be used to calibrate a data, radiation temperature measurement on corresponding pixel points can be carried out, and quantitative evaluation on the thermal insulation performance for an exterior wall of the building can be realized.
Description
Technical field
The present invention relates to a kind of thermometric evaluating system and method, particularly a kind of contactless skin heat-insulating property evaluating system based on infrared temperature-test technology and method.
Background technology
The existing skin heat-insulating property evaluating system (hereinafter referred to as evaluating system) based on thermometry is divided into two classes substantially: a class adopts the temperature probes such as some thermopairs, carries out thermometric assessment to selected multiple sample points.Although this kind equipment can measure the surface temperature of Chosen Point accurately, can not present the thermal field distribution of whole skin, the indivedual heat bridge defects for system are often difficult to find and investigation.Another kind of evaluating system is then the overall thermal field of force assessment adopting temperature measuring type thermal infrared imager to carry out buildings, but this series products is towards common general object mostly, not strong to the specific aim of buildings thermometric, for want of to the statistics of all kinds of building materials infrared emittance and the discriminating measurement at the position such as forms, Men Ti, be often difficult to the accurate quantitative analysis realizing heat bridge defect.
Summary of the invention
The present invention will solve the technical matters that existing temperature measuring type building heat preserving performance evaluation system is difficult to investigate skin thermal field distribution accurate quantitative analysis and heat bridge defect, proposes a kind of thermometric evaluating system for skin heat-insulating property in conjunction with infrared temperature-test technology, visible images cutting techniques and representative point infrared emittance calibration technique and method.
In order to solve the problems of the technologies described above, technical scheme of the present invention is specific as follows:
Based on the skin heat-insulating property evaluating system of infrared temperature-test technology, it comprises:
With visible light lens and the visible images detector of optical axis alignment.Acted on, to buildings visible light wave range to be measured imaging on described visible images detector target surface by the picture that is filtered into of described visible light lens.
With infrared lens and the infrared image detection device of optical axis alignment.Acted on, to buildings infrared band to be measured imaging on described infrared image detection device target surface by the picture that is filtered into of described infrared lens.
Image acquisition and processing module, by the synchronizing signal exported, realize described visible ray, the synchronous triggering of infrared image detection device opto-electronic conversion frame frequency and image data acquiring.
Described image acquisition and processing module, pass through image segmentation algorithm, Region dividing is carried out at the different materials position (as forms, Men Ti etc.) of the buildings visible images collected, and the infrared emittance needed for the infrared temperature Inversion Calculation of different materials region is chosen and is provided positional information.
Described image acquisition and processing module, the Region dividing result obtained according to visible light wave range Iamge Segmentation and the Construction material characteristics of respective regions, to the material infrared emissivity of respective regions to table look-up or the mode of on-site proving sets, the infrared picture data collected for described infrared image detection device provides the infrared emittance parameter information of relevant position, realize the temperature computation of skin different parts to be measured, measured surface true temperature computing formula is:
Wherein, ε is body surface infrared emittance, τ
afor atmospheric optical spec transmissivity, T
rfor infrared emittance is the above-mentioned assigned address surface temperature utilizing described infrared image detection device to record in black body emissivity situation, T
ufor environment temperature, ε
afor atmosphere radiation rate, T
afor atmospheric temperature, n is relevant with selected infrared eye service band, obtains by lookup table mode.
Described lookup table mode is by the infrared emittance data of different for common building materials physical state are set up into a database.In actual use procedure, carry out infrared emittance inquiry according to actual measurement material.
Described on-site proving mode utilizes surface-mount type temperature sensor by actual measurement assigned address surface temperature T
0, infrared emittance is the above-mentioned assigned address surface temperature T utilizing described infrared image detection device to record in black body emissivity situation
r, and environment temperature T
u, calculating is carried out to the infrared emittance of above-mentioned specified location material and demarcates.Infrared emittance computing formula is:
Image display and control module, can realize the image of whole system, interface display and all people's machine function of interaction control.
System of the present invention can also comprise some surface-mount type temperature sensors and temperature data receiver module, can according to actual measurement needs, temperature sensor is attached to assigned address surface, skin to be measured surface, and each point observed temperature data is transferred to temperature data receiver module in a wired or wireless fashion.Temperature data receiver module sends to image acquisition and processing module, to realize the accurate calculating of skin thermal field after being integrated by the temperature data received.
The present invention's beneficial effect is compared with prior art:
(1) skin heat-insulating property evaluating system provided by the invention is compared to other point type temp measuring systems, more comprehensive and accurately can carry out comprehensively exploration and analytic statistics intuitively to skin overall thermal force distribution and heat bridge defect.
(2) skin heat-insulating property evaluating system provided by the invention is compared to other general thermal infrared imager temp measuring systems, introduce buildings material infrared emissivity database especially, surface-mount type temperature sensor gathers, R-T unit, and visible ray segmentation positioning function.Therefore, there is stronger measurement specific aim and the qualitative assessment precision of Geng Gao.
Accompanying drawing explanation
Fig. 1 is skin heat-insulating property evaluating system schematic diagram of the present invention;
Fig. 2 is skin heat-insulating property evaluating system structured flowchart of the present invention;
Fig. 3 is the embodiment of the present invention 1 skin heat-insulating property evaluating system structured flowchart;
1-visible light lens, 2-infrared light camera lens, 3-visible images detector, 4-infrared image detection device, the display of 5-image and control module, 6-first surface-mount type temperature sensor, 7-second surface-mount type temperature sensor, 8-N surface-mount type temperature sensor (wherein, N value is for needing the surface-mount type temperature sensor quantity adopted according to in-site measurement), 9-image acquisition and processing module, 10-surface-mount type temperature sensor temperature data receiver module.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As depicted in figs. 1 and 2, skin heat-insulating property evaluating system based on infrared temperature-test technology provided by the invention, comprise same optical axis alignment visible light lens 1 and visible images detector 3, with optical axis alignment infrared lens 2 and infrared image detection device 4, image display and control module 5, image acquisition and processing module 9.Some surface-mount type temperature sensors (as: the first surface-mount type temperature sensor 6 can also be comprised, second surface-mount type temperature sensor 7,, N surface-mount type temperature sensor 8) and corresponding surface-mount type temperature sensor temperature data receiver module 10.
Visible images detector 3, by being filtered into after the buildings visible images that obtains of picture is converted to view data by visible light lens 1, is transferred to image acquisition and processing module 9.Image acquisition and the image segmentation algorithm of processing module 9 by specifying, carry out Region dividing (as forms, Men Ti etc.) to the different surfaces composition material of buildings in visible images, and stored by area information.
Display interface is controlled with control module 5 by image display, database lookup setting is carried out to inhomogeneity region infrared emittance, or utilize some surface-mount type temperature sensors (as: 1 first surface-mount type temperature sensor 6, second surface-mount type temperature sensor 7,, N surface-mount type temperature sensor 8) and corresponding surface-mount type temperature sensor temperature data receiver module 10 carry out on-site proving.Calibration formula is:
Wherein, ε is body surface infrared emittance T
rfor infrared emittance is the above-mentioned assigned address surface temperature utilizing described infrared image detection device to record in black body emissivity situation, T
ufor environment temperature, T0 is for utilizing surface-mount type temperature sensor by actual measurement assigned address surface temperature, and n is relevant with selected infrared eye service band, obtains by lookup table mode.
Infrared light image detector 4, by being filtered into after the buildings infrared image that obtains of picture is converted to view data by infrared lens 2, is transferred to image acquisition and processing module 9.The infrared picture data that image acquisition and processing module 9 will collect, according to the surperficial infrared emission rate coefficient that region residing for measured surface true temperature computing formula and each pixel is corresponding, calculates the surface temperature of the corresponding each point of infrared image.Calculating formula is as follows:
Wherein, ε is body surface infrared emittance, τ
afor atmospheric optical spec transmissivity, T
rfor infrared emittance is the above-mentioned assigned address surface temperature (this temperature is obtained by blackbody demarcation) utilizing described infrared image detection device to record in black body emissivity situation, T
ufor environment temperature, ε
afor atmosphere radiation rate, T
afor atmospheric temperature, n is relevant with selected infrared eye service band, obtains by lookup table mode.
Image display and control module 5 by system acquisition to visible ray, infrared image carry out corresponding display, and the thermal field temperature data calculated carried out storages and partly show.According to result of calculation, realize the total evaluation of skin heat-insulating property.Total evaluation process is: by the thermal field distribution obtained the infrared imaging of buildings, the obvious too high or too low region of skin temperature can be shown intuitively, and by infrared measurement of temperature algorithm, the temperature difference in skin region too high or too low for temperature and surrounding buildings region is quantitatively shown, and then provides quantitative basis for the assessment of the heat-insulating property of skin.
Embodiment 1
By reference to the accompanying drawings shown in 3, skin heat-insulating property evaluating system based on infrared temperature-test technology provided by the invention comprises: with optical axis alignment visible light lens and visible images detector, with optical axis alignment infrared lens and infrared image detection device, image acquisition and transaction card, for image display and the industrial computer controlled, some surface-mount type temperature sensors, and corresponding surface-mount type temperature sensor temperature data receiver module.
Visible light lens is the iris setting tight shot that can pass through wavelength coverage 400nm-700nm, and focal length is 30mm, F/#=1.Its rear end is 1280 × 960 with the effective pixel resolution of visible images detector of optical axis, carries out data communication by CameraLink data-interface and image acquisition and transaction card.
Infrared lens is the iris setting tight shot that can pass through wavelength coverage 8 μm-13 μm, and focal length is 30mm, F/#=1.Its rear end is 320 × 240 with the effective pixel resolution of infrared image detection device of optical axis, carries out data communication by CameraLink data-interface and image acquisition and transaction card.
Image acquisition and transaction card, primarily of 1 FPGA, 2 DSP and some attached chips and peripheral circuit composition.FPGA for providing the synchronized signal of Visible Light Camera and infrared camera, image acquisition data transmits and the function such as command communication.2 dsp chips are respectively used to the function such as image procossing, temperature computation of visible ray and infrared image.View data after process by FPGA packing transmission, is transferred to industrial computer by standard network interface according to ICP/IP protocol, realizes view data, the display of temperature data and storage again.
Surface-mount type temperature sensor, by PT100 temperature sensor, temperature acquisition treatment circuit, forms based on the wireless transmission circuit of Zigbee wireless transmission protocol and outside adsorption structure.PT100 temperature sensor is surperficial foremost as surface-mount type temperature sensor, directly itself and skin outside surface to be measured can be fitted by adsorption structure, after thermal equilibrium, the temperature value utilizing temperature acquisition treatment circuit to collect sends temperature-measuring results according to based on Zigbee wireless transmission protocol to temperature sensor temperature data receiver module by wireless transmission circuit.Temperature sensor temperature data receiver module by after each temperature sensor measured temperature Data Integration, sends to image acquisition and transaction card by serial ports again, participates in follow-up infrared emittance and demarcates.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain of the invention.
Claims (8)
1. a skin heat-insulating property evaluating system, is characterized in that comprising:
With visible light lens and the visible images detector of optical axis alignment, acted on by the picture that is filtered into of described visible light lens, described visible images detector target surface is filtered into picture to skin visible light wave range to be measured, the skin visible images to be measured obtained, is converted to view data;
With infrared lens and the infrared image detection device of optical axis alignment, acted on by the picture that is filtered into of described infrared lens, described infrared image detection device target surface is filtered into picture to skin infrared band to be measured, obtains skin infrared image, be converted to view data;
Image acquisition and processing module, export synchronous control signal, the skin visible images to be measured that synchronous acquisition visible-light detector obtains and the skin infrared image to be measured that infrared eye obtains; Pass through image segmentation algorithm again, different surfaces composition material in skin visible images to be measured is carried out Region dividing, and according to surperficial infrared emittance corresponding to region residing for skin surface true temperature computing formula to be measured and each pixel of infrared image, calculate the surface temperature of skin infrared image to be measured each pixel corresponding, calculating formula is as follows:
Wherein, ε is the surperficial infrared emittance of skin, to table look-up or the mode of on-site proving sets; τ
afor atmospheric optical spec transmissivity, T
rfor emissivity is the assigned address surface temperature utilizing described infrared image detection device to record in black body emissivity situation, this temperature is obtained by blackbody demarcation, T
ufor environment temperature, ε
afor atmosphere radiation rate, T
afor atmospheric temperature, n is relevant with selected infrared eye service band, is obtained by lookup table mode;
Image display and control module, the skin visible images to be measured image acquisition and processing module collected and infrared image carry out corresponding display, and surface temperature data image acquisition and processing module calculated carries out storage and part shows, according to result of calculation, realize the total evaluation of skin heat-insulating property to be measured.
2. a kind of skin heat-insulating property evaluating system according to claim 1, it is characterized in that: described ε, carrying out setting with lookup table mode is: by the infrared emittance data of different for common building materials physical state are set up into a database, in actual use procedure, carry out infrared emittance inquiry according to actual measurement material.
3. a kind of skin heat-insulating property evaluating system according to claim 1, it is characterized in that: described ε, with the computing formula of on-site proving mode be: utilize some surface-mount type temperature sensors by actual measurement skin assigned address surface true temperature T to be measured
0, emissivity is the assigned address surface temperature T utilizing described infrared image detection device to record in black body emissivity situation
r, and environment temperature T
u, carry out calculating to the ε of specified location material and demarcate, ε calibrated and calculated formula is:
4. a kind of skin heat-insulating property evaluating system according to claim 3, it is characterized in that: described system also comprises temperature data receiver module, according to actual measurement needs, some surface-mount type temperature sensors are attached to buildings assigned address to be measured surface, and the observed temperature data on assigned address surface is transferred to temperature data receiver module in a wired or wireless fashion; Temperature data receiver module sends to image acquisition and processing module, to realize the accurate calculating of skin thermal field after being integrated by the temperature data received.
5. a kind of skin heat-insulating property evaluating system according to claim 1, it is characterized in that: described image display and control module are according to result of calculation, the process realizing the total evaluation of skin heat-insulating property to be measured is: by the thermal field distribution obtained the infrared imaging of buildings, show the obvious too high or too low region of skin temperature intuitively, and by infrared measurement of temperature algorithm, the temperature difference in skin region too high or too low for temperature and surrounding buildings region is quantitatively shown, and then provide quantitative basis for the assessment of the heat-insulating property of skin.
6. a kind of skin heat-insulating property evaluating system according to claim 1, it is characterized in that: described surface-mount type temperature sensor, by temperature sensor, temperature acquisition treatment circuit, form based on the wireless transmission circuit of wireless transmission protocol and outside adsorption structure; Temperature sensor is surperficial foremost as surface-mount type temperature sensor, directly itself and external surface of buildings to be measured can be fitted by adsorption structure, after thermal equilibrium, the temperature value utilizing temperature acquisition treatment circuit to collect sends temperature-measuring results according to the wireless transmission protocol of setting to temperature sensor temperature data receiver module by wireless transmission circuit; Temperature sensor temperature data receiver module, again by after each temperature sensor measured temperature Data Integration, sends to image acquisition and process mould guide block by serial ports, participates in follow-up infrared emittance and demarcate.
7. a skin heat-insulating property appraisal procedure, is characterized in that performing step is as follows:
(1) image acquisition and processing module export synchronizing signal, control visible images detector and infrared eye synchronous working;
(2) visible-light detector is filtered into the skin visible images that obtains of picture by visible light lens, after being converted to view data, is transferred to image acquisition and processing module;
(3) infrared light image detector is by being filtered into after the skin infrared image that obtains of picture is converted to view data by infrared lens, is transferred to image acquisition and processing module;
(4) image acquisition and processing module are by image segmentation algorithm, carry out Region dividing, and stored by area information the different surfaces composition material of buildings in visible images; By the infrared picture data collected, according to the surperficial infrared emittance that region residing for skin measured surface true temperature computing formula to be measured and each pixel of infrared image is corresponding, calculate the surface temperature of the corresponding each point of infrared image, calculating formula is as follows:
Wherein, ε is skin to be measured surface infrared emittance, τ
afor atmospheric optical spec transmissivity, T
rfor emissivity is the above-mentioned assigned address surface temperature utilizing described infrared image detection device to record in black body emissivity situation, this temperature is obtained by blackbody demarcation, T
ufor environment temperature, ε
afor atmosphere radiation rate, T
afor atmospheric temperature, n is relevant with selected infrared eye service band, is obtained by lookup table mode;
(5) visible images data and infrared picture data are carried out corresponding display to control module by image display, and the thermal field temperature data calculated is carried out storage and part display, according to result of calculation, realize the total evaluation of skin heat-insulating property.
8. skin heat-insulating property appraisal procedure according to claim 7, it is characterized in that: control display interface by image display with control module, database lookup setting is carried out to inhomogeneity region infrared emittance, or utilize some surface-mount type temperature sensors and corresponding surface-mount type temperature sensor temperature data receiver module to carry out on-site proving, calibration formula is:
Wherein, T
0the assigned address surface temperature recorded for utilizing surface-mount type temperature sensor.
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| CN106568801A (en) * | 2016-10-25 | 2017-04-19 | 沈阳建筑大学 | Nondestructive testing method for defects of insulation boards for exterior insulation walls |
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| CN107830933A (en) * | 2017-10-30 | 2018-03-23 | 上海理工大学 | High voltage direct current converter valve panorama cruising inspection system based on FPGA |
| CN108871583A (en) * | 2018-07-03 | 2018-11-23 | 中铝瑞闽股份有限公司 | A kind of accurate measurement method of the aluminium volume temperature based on thermal infrared imaging technology |
| CN109685362A (en) * | 2018-12-21 | 2019-04-26 | 吉林建筑大学 | Architectural Heritage and Conservation assessment system and appraisal procedure are constructed based on intelligent network |
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| CN114113192A (en) * | 2021-09-23 | 2022-03-01 | 中国人民解放军空军工程大学 | Device and method for measuring emissivity of damaged part of test piece at normal temperature |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106568801A (en) * | 2016-10-25 | 2017-04-19 | 沈阳建筑大学 | Nondestructive testing method for defects of insulation boards for exterior insulation walls |
| CN106568801B (en) * | 2016-10-25 | 2019-03-12 | 沈阳建筑大学 | The lossless detection method of external heat insulating wall heat preservation board defect |
| CN107631803A (en) * | 2017-09-13 | 2018-01-26 | 长江勘测规划设计研究有限责任公司 | Surface temperature of concrete accurate measurement method based on thermal sensation imaging |
| CN107830933A (en) * | 2017-10-30 | 2018-03-23 | 上海理工大学 | High voltage direct current converter valve panorama cruising inspection system based on FPGA |
| CN108871583A (en) * | 2018-07-03 | 2018-11-23 | 中铝瑞闽股份有限公司 | A kind of accurate measurement method of the aluminium volume temperature based on thermal infrared imaging technology |
| CN109685362A (en) * | 2018-12-21 | 2019-04-26 | 吉林建筑大学 | Architectural Heritage and Conservation assessment system and appraisal procedure are constructed based on intelligent network |
| CN109685362B (en) * | 2018-12-21 | 2021-04-23 | 吉林建筑大学 | Building legacy protection evaluation system and method based on intelligent network |
| CN112181024A (en) * | 2020-10-23 | 2021-01-05 | 舒城诚鑫建材有限公司 | Rock wool fiber energy-saving heat-preservation system |
| CN112181024B (en) * | 2020-10-23 | 2021-09-14 | 舒城诚鑫建材有限公司 | Rock wool fiber energy-saving heat-preservation system |
| CN113252724A (en) * | 2021-05-21 | 2021-08-13 | 山东中坚工程质量检测有限公司 | Method for detecting heat preservation performance of external wall |
| CN113252724B (en) * | 2021-05-21 | 2022-05-31 | 山东中坚工程质量检测有限公司 | Method for detecting heat preservation performance of external wall |
| CN114113192A (en) * | 2021-09-23 | 2022-03-01 | 中国人民解放军空军工程大学 | Device and method for measuring emissivity of damaged part of test piece at normal temperature |
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