CN108712150B - Tower type solar heliostat minute surface emissivity and clean level detection method - Google Patents
Tower type solar heliostat minute surface emissivity and clean level detection method Download PDFInfo
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- CN108712150B CN108712150B CN201810339092.4A CN201810339092A CN108712150B CN 108712150 B CN108712150 B CN 108712150B CN 201810339092 A CN201810339092 A CN 201810339092A CN 108712150 B CN108712150 B CN 108712150B
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 10
- 238000005259 measurement Methods 0.000 description 9
- 238000004140 cleaning Methods 0.000 description 7
- 229910052697 platinum Inorganic materials 0.000 description 5
- 238000010248 power generation Methods 0.000 description 5
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
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- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/94—Investigating contamination, e.g. dust
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a kind of tower type solar heliostat minute surface emissivity and clean level detection method.Sunny night records heliostat minute surface temperature with temperature sensor, and thermal infrared imager shoots the infrared image of heliostat minute surface；Calculate radiation temperature, calculate heliostat minute surface emissivity；Heliostat temperature when night records thermal imaging system shooting with temperature sensor, thermal infrared imager shoot the infrared image of heliostat minute surface, calculate radiation temperature；It is laid with different types of dust collection in advance and obtains radiation temperature and environment temperature, and the Fitting Calculation obtains relational expression between emissivity and weight of dust；The weight of dust in heliostat minute surface to be measured is obtained according to relational expression.Emissivity detection method of the present invention can measure heliostat minute surface emissivity outdoors；It is high-efficient, it is suitable for a large amount of heliostats and measures；Mirror surface clean level can be detected at night, will not influence tower type solar power station generating efficiency, reduce the testing cost of heliostat minute surface clean level.
Description
Technical field
The present invention relates to solar light-heat power-generation fields, in particular to a kind of tower type solar heliostat mirror surface launching
Rate and clean level detection method.
Background technique
The features such as solar energy is huge, lasting and environmental-friendly with its energy as a kind of renewable energy of plot is got over
Come the application got over, it is divided into two kinds currently with solar energy mainstream electricity generation system: first is that solar energy power generating, second is that solar heat
Power generation.Solar energy thermal-power-generating specifically includes that tower, slot type and dish-style etc. based on light collecting.
Tower-type solar thermal power generating system is generally by four masters such as heat absorption tower, heliostat array, generating set and heat storage can
Mian part is grouped as.Heliostat array belongs to the light and heat collection subsystem in photo-thermal power station system.Heliostat is a kind of (anti-by mirror surface
Penetrate mirror), mirror holder (support construction), tracking control system, the compositions such as tracking drive mechanism beam condensing unit, received for tracking
Assemble sunlight reflection to the heat collector for receiving top of tower, is the essential core technology and dress at tower type solar energy thermal power generation station
It sets.Heat absorption tower belongs to the collection thermal sub-system in photo-thermal power station system, and the solar energy that heliostat is captured, reflected, focused by it is straight
Switch through and turn to available high temperature heat, provide power source for generating set, to realize hot power generation.
The clean level of heliostat minute surface is always to influence the primary factor of photo-thermal power station generating efficiency.Because mirror surface is clean
The decline of degree will to reduce from the light of mirror-reflection, and the reduction of light concentrating times declines Thermogenesis, eventually shadow
Ring the operational efficiency for arriving turbine LP rotors.Overwhelming majority photo-thermal power station is all using the method for periodically cleaning settled date mirror surface at present
Remove the dust accumulation of removing settled date mirror surface.But regular clean method can make photo-thermal electric departing from the actual clean level of settled date mirror surface
The generating efficiency stood cannot be guaranteed.So needing a kind of method for being able to detect settled date mirror surface clean level all to instruct to clean
Phase.
It is generally used in daytime in existing technology, with heliostat reflected sunlight to target surface, acquires the bright of target surface with CCD
Information is spent, the clean-up performance of heliostat minute surface is judged according to target surface brightness.It is this to be carried out during the operation of tower-type electricity generation station on daytime
The mode for detecting settled date mirror surface clean level there are problems that influencing generating efficiency.
When measuring object materials surface temperature using Radiation Temperature Measurement Instrument, emissivity is to characterize the physical quantity of its radiation characteristic,
It is important one of thermophysical parameter.The thermal imaging system being arranged using different emissivity measures same testee surface, can because
The difference of emissivity setting causes temperature-measuring results different；Different measured object body surfaces are measured using the thermal imaging system that same emissivity is arranged
Face, can be because the thermophysical property difference on different testee surfaces causes temperature-measuring results different.Therefore, clean mirror surface and attachment
The mirror surface of dust is compared, and the thermophysical property of surface both is different, i.e., emissivity is different, the measurement of thermal imaging system under identical conditions
As a result difference can be generated.Therefore a kind of measurement method of tower solar energy heliostat mirror surface emissivity in open air is needed, transmitting is established
Rate-amount of dust fitting formula, and in this, as the measurement method of tower type solar heliostat minute surface clean level.
Existing emissivity measurement method can be divided into stable state calorimetry, whole black matrix method, integral according to the difference of principle
Ball reflectometer method etc..
Steady state method: Worthing proposes filament heating method measurement material hemispherical emissivity, is that steady state method is more typical
Using.But the manufacture craft of this method sample is very complicated, and test speed is slower, but versatility is fine, and precision is not yet
Mistake has more universal in practical applications.
Whole black matrix method, test philosophy: as a whole by sample and reference blackbody, reference blackbody is sample surfaces
A hole, using the energy of hole bottom as the energy of reference blackbody, this requires sample to have certain thickness.From emissivity
Definition is set out, and the energy of sample surfaces can calculate the emissivity of material with the ratio of hole bottom energy.
Test sample: being placed on the center of integrating sphere, is radiated on sample with light beam by integrating sphere bounce technique, reflection
Light is evenly distributed on inside integrating sphere by the diffusing reflection of integrating sphere inner wall, and it is a certain to measure integrating sphere by photodetector
The energy of a angle.Then, it is placed on the same position with the on-gauge plate of known reflectivity replacement sample, uses identical measurement side
Method can measure the energy value of reflected light.By comparing the energy value of two diffused lights, the reflectivity of sample can be calculated.
During this method, a large amount of test and instrument error can be introduced, therefore precision is not very high, but can satisfy most of
The temperature range of Materials Measurement.
However above-mentioned test method is sufficiently complex, has specific requirement to experimental situation, and can not use outdoors.
Summary of the invention
In order to solve the problems, such as background technique, the object of the present invention is to provide a kind of tower type solars to use the settled date
Mirror mirror surface emissivity and clean level detection method.
Emissivity detection method is by the relative position of control thermal imaging system and heliostat minute surface, and combination temperature sensor
The temperature computation heliostat minute surface emissivity measured, is not the precise measurement of heliostat minute surface emissivity, and be in this hair
Bright set experiment condition goes down to measure heliostat minute surface emissivity, be further used for establishing the difference of emissivity from it is different
The relationship of the cleannes of heliostat minute surface.
It is clean that clean level detection method can be realized settled date mirror surface of the detection tower type solar heliostat in longtime running
Net degree solves the problem of existing periodic cleaning heliostat bring decrease in power generation efficiency, power station operating cost rises and shows
There is the problem of detection means will affect generating efficiency.
To solve the above problems, the technical solution adopted in the present invention the following steps are included:
One, a kind of tower type solar heliostat minute surface emissivity detection method:
1) at sunny night, heliostat minute surface temperature is recorded with temperature sensor, it is fixed to shoot using thermal infrared imager
The infrared image of solar eyepiece mirror surface, and by the storage of the two data into computer；
2) radiation temperature and heliostat minute surface temperature, are brought into the Boltzmann of rewriting by the radiation temperature for calculating infrared image
In formula, the emissivity of heliostat minute surface is calculated.
The temperature sensor is attached to the back side of heliostat minute surface, and detected temperature is as heliostat minute surface temperature
Degree.The temperature sensor uses four-wire system patch platinum resistance.
Angle between the optical axis and heliostat minute surface normal direction of the described thermal infrared imager probe between ± 10 °~20 °,
Spacing between probe and heliostat minute surface is at least 40cm, so that visual field captured by thermal infrared imager accounts for the total face of heliostat minute surface
Long-pending 80%, and avoid thermal imaging system itself from being imaged in infrared image always, atmospheric transmission and atmospheric emission can be ignored in this way
Generated influence.
The thermal infrared imager is 7~14 μm of far infrared bands, the hair of thermal infrared imager when shooting heliostat minute surface
The rate parameter of penetrating is set as 1, so that the radiant power that heliostat minute surface issues to be considered as to the radiant power of black matrix sending, the temperature measured
It spends and then calculates radiation temperature.
The radiation temperature of the calculating infrared image is specifically: at sunny calm night, by the emissivity of thermal imaging system
Be set as 1, after the infrared image of acquisition is carried out image procossing, extract the image-region where heliostat splicing boundary and from
Mirror surface infrared image is obtained after removing in infrared image, average computation is carried out to the infrared temperature angle value of mirror surface infrared image and obtains spoke
Penetrate temperature.
In the step 1), by radiation temperature TrWith mirror temperature T0Bring the Boltzmann of the rewriting of following formula expression into
In formula, the emissivity ε of heliostat minute surface is calculated0:
Wherein, T0Indicate heliostat mirror temperature to be measured, TrIndicate the radiation temperature of infrared image.
The present invention can accurately measure heliostat minute surface emissivity using the relationship of above-mentioned formula.
The present invention using infrared heat image instrument measuring heliostat minute surface emissivity it was found that, thermal imaging system receive it is infrared
Radiation includes three parts: the radiation of radiation, testee reflection environment that testee itself issues and atmospheric radiation.It is tested
The radiation and atmospheric radiation that object itself issues are very small, ignore in present invention calculating.
Two, a kind of tower type solar heliostat minute surface clean level detection method:
1) at sunny calm night, environment temperature when thermal imaging system is shot near heliostat is recorded with temperature sensor,
Using the infrared image of thermal infrared imager shooting heliostat minute surface, and by the storage of the two data into computer, then calculate infrared
The radiation temperature of image；
2) dust for weighing up weight in advance is uniformly laid in complete clean heliostat minute surface in advance, using step 1)
Mode, which acquires, obtains mean temperature and environment temperature；
3) it repeats step 2) to carry out repeatedly, is uniformly laid with the dust of different weight every time, acquisition obtains the spoke of multiple repairing weld
Penetrate temperature, environment temperature and weight of dust；The hair of tested heliostat minute surface is calculated then in conjunction with radiation temperature and environment temperature
The rate of penetrating is fitted calculating and obtains relationship between emissivity and weight of dust；
4) it is directed to heliostat to be measured, is acquired using step 1) mode and obtains mean temperature and environment temperature, then substitutes into step
The weight of dust obtained in heliostat minute surface to be measured is calculated in relationship between the rapid emissivity and weight of dust 3) obtained, with this table
Levy settled date mirror surface clean level.
The thermal infrared imager and temperature sensor are equipped on unmanned plane or trolley, are moved to by unmanned plane or trolley
Heliostat is nearby shot and is measured.
The optical axis of the thermal infrared imager probe and the angle of heliostat minute surface normal vector are kept away between ± 10 °~20 °
Exempt from thermal imaging system itself to be imaged in infrared image.
The radiation temperature of the calculating infrared image is specifically: at sunny calm night, by the emissivity of thermal imaging system
Be set as 1, after the infrared image of acquisition is carried out image procossing, extract the image-region where heliostat splicing boundary and from
Mirror surface infrared image is obtained after removing in infrared image, average computation is carried out to the infrared temperature angle value of mirror surface infrared image and obtains spoke
Penetrate temperature.
It is specifically to be intended in the step 3) using the mean temperature and environment temperature of following formula combination infrared image
Total calculate obtains coefficient a, b, c:
Y=a ε0 2+bε0+c
Wherein, T0Indicate heliostat mirror temperature to be measured, and as environment temperature, TrIndicate the radiation temperature of infrared image,
A, b, c respectively indicate two-term coefficient, Monomial coefficient, constant term coefficient, and y indicates the weight of dust in heliostat minute surface, ε0
Emissivity is indicated, using the ratio between infrared radiation temperature and clean mirror temperature as emissivity.
The present invention carries out the clean level that processing obtains settled date mirror surface using infrared temperature data.And it was found that emissivity and
There is the non-linear relation of rule between the clean level of settled date mirror surface, and obtains non-linear relation, benefit using data fitting
Solar eyepiece to be determined is detected with non-linear relation.
The present invention has found that for thermal imaging system when shooting heliostat to be measured, heliostat reflection is sky during experiment,
Since the spectral energy of the sky far infrared band at sunny calm night is very small, so setting 1 for the emissivity of thermal imaging system.
Above-mentioned fitting formula indicates that clean mirror and the mirror of adhesive dust in the identical situation of the two true temperature, utilize cleaning
The otherness of the emissivity of mirror surface itself and the mirror surface emissivity adhered to after upper dust carries out the survey of heliostat minute surface clean level
Amount.Therefore present invention applicant carries out detection processing to heliostat minute surface clean level using the relationship of above-mentioned formula.
The beneficial effects of the present invention are:
Compared to traditional emissivity measurement method, emissivity detection method of the present invention can be in night outdoor accurate measurement
Heliostat minute surface emissivity；The heliostat minute surface emissivity of different cleaning degree is different, can be used for establishing emissivity and heliostat
The relationship of mirror surface clean level；It is fairly simple to detect operating process, it is high-efficient, it is suitable for a large amount of heliostats and measures.
Compared with prior art, clean level detection method of the present invention can be in night outdoor accurate detection mirror surface cleaning journey
Degree, will not influence tower type solar power station generating efficiency.
Clean level detection method of the present invention is not needed additionally using thermal infrared imager detection heliostat minute surface clean level
Light source and target surface carry thermal imaging system using unmanned plane or trolley and shoot heliostat, reduce heliostat minute surface clean level
Testing cost, can be as the guidance foundation of mirror surface cleaning frequency on settled date.
Detailed description of the invention
Fig. 1 is the detection system structure using emissivity detection method of the present invention.
Fig. 2 is the detection system structure using clean level detection method of the present invention.
Fig. 3 is the implementation fit correlation figure of embodiment 2.
In figure: industrial personal computer (1), trolley (5), unmanned plane (3), thermal infrared imager (4), computer (6), is determined heliostat (2)
Day mirror support (7), temperature polling instrument (8), temperature sensor (9), translation sliding rail (10), spherical pan head (11).
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
The embodiment 1 of emissivity detection:
As shown in Figure 1, present invention specific implementation includes heliostat support 7, heliostat 2, translation sliding rail 10, thermal imaging system 4, ball
Type holder 11, four-wire system patch platinum resistance 6, temperature polling instrument 8 and computer 6,
Computer 6 connects thermal infrared imager 4 and temperature polling instrument 8；Thermal infrared imager 4, which is mounted on, is fixed on translation sliding rail 10
On spherical pan head 11, spherical pan head 11 is connected on translating rails 10；2 mirror surface of heliostat is fixed on heliostat minute surface bracket
On 7,2 mirror surface of heliostat and ground-angle are adjustable.
Temperature sensor 9 uses four-wire system patch platinum resistance, and four conducting wires of extraction are connected to temperature polling instrument, four-wire system
Patch platinum resistance affixes to 2 mirror surface of heliostat behind, and the conducting wire of extraction is connected to temperature polling instrument 8.
Temperature polling instrument 8, thermal imaging system 4 and translating rails 10 are connect with computer 6, and pass through 6 storage temperature number of computer
According to, infrared image and control the moving distances of translating rails.
The specific implementation process of embodiment 1 is as follows:
Selecting sunny night to carry out emissivity measurement is to avoid having an impact to measurement for solar radiation and aerial cloud layer,
It please refers to shown in 2, the heliostat mirror face interval 2cm of 6 20cm*20cm square different cleaning degree is used in this implementation process
It is placed side by side, four-wire system patch platinum resistance is pasted behind in each heliostat minute surface；The heliostat minute surface and ground angle of setting
It is 60 °, thermal imaging system optical axis and mirror surface normal vector angle are 20 °, and distance is 40cm；Thermal imaging system is directed at first heliostat mirror
The step distance in face, setting translation sliding rail is 22cm；The emissivity parameter that thermal imaging system is arranged is 1, atmospheric transmissivity 1.
Start to carry out heliostat minute surface emissivity measurement.The weight of dust of mirror 1 to mirror 6 be respectively as follows: 0.003g, 0.036g,
0.098g, 0.126g, 0.207g, 0.283g, stand 30 minutes after, using thermal imaging system shoot each heliostat minute surface obtain it is red
Outer image calculates its mean radiant temperature Tr1=-3.50, Tr2=-3.22, Tr3=-2.67, Tr4=-2.66, Tr5=-2.28,
Tr6=-1.67,
It is recorded to the true temperature T of each heliostat minute surface to be measured with temperature sensor01、T02…T06It is all 6.47 DEG C,
It carries it into the Boltzmann formula of rewriting, the emissivity ε of each heliostat minute surface is calculated01=0.922543, ε02=
0.926381、ε03=0.933954, ε04=0.934093, ε05=0.939353, ε06=0.947843.
The embodiment 2 of clean level detection
As shown in Fig. 2, specific implementation includes industrial personal computer 1, heliostat 2, trolley 5, unmanned plane 3 and thermal infrared imager 4, calculates
Machine 6, industrial personal computer 1 connect heliostat 2, and heliostat 2 is connect with industrial personal computer 1, and industrial personal computer 1 controls heliostat 2 and works, trolley 5 and nothing
Be respectively arranged with thermal infrared imager 4 on man-machine 3, unmanned plane 3 flies trolley 5 above, trolley 5 and unmanned plane 3 in front of heliostat 2 simultaneously
And the probe of thermal infrared imager 4 is made to pass through wireless computer 6 and communication connection towards heliostat 2, trolley 5 and unmanned plane 3.
It is also moved near heliostat 2 equipped with temperature sensor by unmanned plane or trolley on unmanned plane 3 and trolley 5
It is shot and is measured by temperature sensor and thermal infrared imager 4.
The angle for the 2 mirror surface normal vector of optical axis and heliostat that thermal infrared imager 4 is popped one's head in avoids heat between ± 10 °~20 °
As instrument itself is imaged in infrared image.
Without the influence of solar radiation when sunny calm night, the emissivity of setting thermal imaging system 4 is 1, and industrial personal computer 1 is controlled
Heliostat 2 to be measured is made to suitable shooting angle, acquiring trolley 5 or the carrying thermal infrared imager 4 of unmanned plane 3 at a certain angle should
The infrared image of heliostat, this angle make mirror surface normal vector and thermal imaging system camera lens optical axis angle between ± 10 °~20 °, thermal imagery
The area that instrument should be maintained at the heliostat of thermal imaging system shooting at a distance from heliostat is settled date mirror area 80% or so, utilizes trolley
Or unmanned plane carry temperature sensor record image taking when environment temperature, the two is sent to computer 6.
The image-region where heliostat splicing boundary is extracted in computer 6 and obtains mirror after removing in infrared image
Face infrared image carries out average computation to the infrared temperature angle value of mirror surface infrared image and obtains mean temperature.Night is considered in the present invention
Between heliostat heat is not generated in the case where not running, it is believed that the temperature of clean mirror surface is approximately equal with environment temperature.
The specific implementation process of embodiment 2 is as follows:
1) at sunny calm night, environment temperature when thermal imaging system is shot near heliostat is recorded with temperature sensor,
The infrared image of heliostat minute surface is shot using thermal infrared imager 4, and by the storage of the two data into computer 6, then calculate red
The radiation temperature of outer image；
2) dust for weighing up weight in advance is uniformly laid in complete clean heliostat minute surface in advance, dust is uniform
Ground is routed on clean experiment mirror surface, and standing makes itself and environment equality of temperature in 15 minutes, and the angle of regulation experiment mirror surface makes mirror surface
Normal vector and thermal imaging system camera lens optical axis angle are between ± 10 °~20 °, and the area of the heliostat of thermal imaging system shooting is heliostat
The 80% of the mirror surface gross area is acquired using step 1) mode and obtains mean temperature and environment temperature, is saved in computer, then clearly
Clean mirror surface.
3) dust that step 2) is laid with 50 groups of difference known weights is repeated, 50 groups of infrared mean temperatures, environment temperatures are obtained
With the data of weight of dust.
Calculating is fitted then in conjunction with the emissivity that radiation temperature and environment temperature calculate tested heliostat minute surface to obtain
The relationship between emissivity and weight of dust of obtaining, two-dimentional relation figure is as shown in figure 3, a=48.96, b=-80.07, c that fitting obtains
=32.2 value, i.e. relation formula are as follows:
Y=48.96 ε0 2-80.07ε0+32.2
4) it is directed to heliostat to be measured, the dust of 5 groups of different weights is weighed, according to step 1)~3) obtain infrared mean temperature
And environment temperature, it then substitutes into and calculates acquisition heliostat mirror to be measured between the emissivity and weight of dust that step 3) obtains in relationship
Weight of dust on face.And the weight of dust that calculates of analysis relation formula and true known dust weight difference, such as the following table 1:
Table 1
| Mirror number | Dust calculated value m | Dust actual value m0 | Error m0-m |
| #1 | 0.041 | 0.036 | 0.002 |
| #2 | 0.125 | 0.098 | -0.005 |
| #3 | 0.126 | 0.126 | -0.027 |
| #4 | 0.188 | 0.207 | 0.019 |
| #5 | 0.292 | 0.283 | -0.009 |
Non- splicing heliostat used in the present embodiment, so there is no detect mirror splicing boundary and remove.
The unit that the present embodiment obtains weight of dust is g/m2。
Claims (6)
1. a kind of tower type solar heliostat minute surface emissivity detection method, it is characterised in that method are as follows:
1) at sunny night, heliostat (2) mirror temperature is recorded with temperature sensor (9), is clapped using thermal infrared imager (4)
Take the photograph the infrared image of heliostat (2) mirror surface；
2) radiation temperature and heliostat (2) mirror temperature, are brought into the Boltzmann of rewriting by the radiation temperature for calculating infrared image
In formula, the emissivity of heliostat (2) mirror surface is calculated；
The radiation temperature of the calculating infrared image is specifically: at sunny calm night, the emissivity of thermal imaging system being arranged
It is 1, after the infrared image of acquisition is carried out image procossing, extracts the image-region where heliostat splicing boundary and from infrared
Mirror surface infrared image is obtained after removing in image, average computation is carried out to the infrared temperature angle value of mirror surface infrared image and obtains radiation temperature
Degree；
In the step 1), by radiation temperature TrWith mirror temperature T0Bring the Boltzmann formula of the rewriting of following formula expression into
In, the emissivity ε of heliostat minute surface is calculated0:
Wherein, T0Indicate heliostat mirror temperature to be measured, TrIndicate the radiation temperature of infrared image.
2. a kind of tower type solar according to claim 1 heliostat minute surface emissivity detection method, it is characterised in that:
The temperature sensor (9) is attached to the back side of heliostat (2) mirror surface, and detected temperature is as heliostat (2) mirror surface temperature
Degree.
3. a kind of tower type solar according to claim 1 heliostat minute surface emissivity detection method, it is characterised in that:
Angle between the optical axis and heliostat (2) mirror surface normal direction of thermal infrared imager (4) probe is visited between ± 10 °~20 °
Spacing between head and heliostat (2) mirror surface is at least 40cm, so that visual field captured by thermal infrared imager (4) accounts for heliostat (2)
The 80% of the mirror surface gross area.
4. a kind of tower type solar heliostat minute surface clean level detection method, it is characterised in that method the following steps are included:
1) it is utilized at sunny calm night with the environment temperature near heliostat when temperature sensor record thermal imaging system shooting
The infrared image of thermal infrared imager (4) shooting heliostat minute surface calculates the radiation temperature of infrared image again；
2) dust for weighing up weight in advance is uniformly laid in complete clean heliostat minute surface in advance, using step 1) mode
Acquisition obtains mean temperature and environment temperature；
3) it repeats step 2) to carry out repeatedly, is uniformly laid with the dust of different weight every time, acquisition obtains the radiation temperature of multiple repairing weld
Degree, environment temperature and weight of dust；The emissivity of tested heliostat minute surface is calculated then in conjunction with radiation temperature and environment temperature,
Emissivity combination weight of dust is fitted calculating again and obtains relationship between emissivity and weight of dust；
4) it is directed to heliostat to be measured, is acquired using step 1) mode and obtains mean temperature and environment temperature, then substitutes into step 3)
The weight of dust obtained in heliostat minute surface to be measured is calculated between the emissivity and weight of dust of acquisition in relationship；
The radiation temperature of the calculating infrared image is specifically: at sunny calm night, the emissivity of thermal imaging system being arranged
It is 1, after the infrared image of acquisition is carried out image procossing, extracts the image-region where heliostat splicing boundary and from infrared
Mirror surface infrared image is obtained after removing in image, average computation is carried out to the infrared temperature angle value of mirror surface infrared image and obtains radiation temperature
Degree；
It is specifically that meter is fitted using the mean temperature and environment temperature of following formula combination infrared image in the step 3)
It calculates and obtains coefficient a, b, c:
Y=a ε0 2+bε0+c
Wherein, T0Indicate heliostat mirror temperature to be measured, and as environment temperature, TrThe radiation temperature of expression infrared image, a, b,
C respectively indicates two-term coefficient, Monomial coefficient, constant term coefficient, and y indicates the weight of dust in heliostat minute surface, ε0It indicates
Emissivity.
5. a kind of tower type solar according to claim 4 heliostat minute surface clean level detection method, feature exist
In: the thermal infrared imager (4) and temperature sensor are equipped on unmanned plane (3) or trolley (5), are moved by unmanned plane or trolley
Heliostat is moved nearby to be shot and measured.
6. a kind of tower type solar according to claim 4 heliostat minute surface clean level detection method, feature exist
In: the optical axis of thermal infrared imager (4) probe and the angle of heliostat minute surface normal vector avoid between ± 10 °~20 °
Thermal imaging system itself is imaged in infrared image.
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| CN110108536B (en) * | 2019-06-18 | 2021-10-01 | 中国计量大学 | Standard plate manufacturing method for heliostat area gray level detection and comparison |
| CN110716576A (en) * | 2019-11-07 | 2020-01-21 | 浙江中光新能源科技有限公司 | Heliostat field inspection system and method based on unmanned aerial vehicle |
| CN113859574B (en) * | 2020-06-30 | 2024-01-05 | 北京振兴计量测试研究所 | Unmanned aerial vehicle optical load performance detection device and method in flight state |
| CN112903629B (en) * | 2021-01-15 | 2022-09-09 | 中国计量大学 | Heliostat reflectivity detection method |
| CN113363855A (en) * | 2021-07-19 | 2021-09-07 | 河南省新思源电力科学研究院有限公司 | Photovoltaic power station monitoring and management system |
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| CN106248214A (en) * | 2015-06-05 | 2016-12-21 | 桂林市新业机械制造有限责任公司 | A kind of method of infrared heat image instrument measuring surface emissivity |
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