CN109855739A - Power equipment infrared measurement of temperature method and device based on affine transformation - Google Patents
Power equipment infrared measurement of temperature method and device based on affine transformation Download PDFInfo
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- CN109855739A CN109855739A CN201910009409.2A CN201910009409A CN109855739A CN 109855739 A CN109855739 A CN 109855739A CN 201910009409 A CN201910009409 A CN 201910009409A CN 109855739 A CN109855739 A CN 109855739A
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Abstract
Power equipment infrared measurement of temperature method and device based on affine transformation selects power equipment optimum temperature map visual angle, shoots and store reference temperature map；Three pixel reference point coordinates are selected in map；Selection any angle and distance carry out temperature map to power equipment and shoot；The corresponding position coordinates of pixel reference point are found in actual photographed map；Affine transformation matrix is calculated；According to affine transformation matrix, by the hygrogram spectral transformation of actual photographed to reference temperature map；Power equipment Temperature Distribution under viewing transformation to reference temperature map, according to temperature map judge power equipment whether failure；When measuring next time, step is repeated, and power equipment can be judged with the presence or absence of failure by comparing the difference of multiple temperature map.The present invention adjusts the temperature map shot every time to same angle by affine transformation, improves temperature map mutually than property, and can reduce the technical requirements to staff.
Description
Technical field
The invention belongs to electric device maintenance, in particular to a kind of power equipment infrared measurement of temperature method based on affine transformation
And device, it is mainly used for the temperature measurement of various power equipments.
Background technique
The safety and benefit of the operating status quality of power equipment directly decision electric system, have in substation transformer,
The equipment such as bus, disconnecting switch, breaker, coupling capacitor, high-tension cable.No matter there is abnormal working position in which kind of equipment
If processing is likely to develop into failure not in time, or even cause equipment damage or personal injury, and cause it is immeasurable after
Fruit.Equipment is effectively monitored and detected, equipment maintenance cost can be made to reduce 25%~50%, equipment failure rate is reduced
75%, economic benefit is very significant.Since infrared detection technology can be with remote, non-contact, real-time, quick obtaining equipment
Running state information, and have high resolution, visual in image, unexcellent by electromagnetic interference, safe and reliable and benefit/output investment ratio height etc.
Point, and the diagnostic analysis of failure can be carried out under the situation for not having a power failure, not sampling, do not disintegrate, currently, infrared diagnosis technology exists
Electric system is used widely.However, staff acquires shooting angle, the distance of infared spectrum when due to practical operation
With randomness, the map temperature captured when causing repeatedly to measure is difficult unanimously to be unable to satisfy map mutually than the requirement of property.
Chinese patent " a kind of power equipment Radio infrared thermometric temperature correction method (105241553 B of CN) " discloses
A kind of power equipment Radio infrared thermometric temperature correction method of relay protection field includes the following steps: to obtain with wireless red
Measured by outer temperature measuring equipment, the curve that the temperature of equipment described in same day previous year changes over time, same day previous year ring
The curve that the electric current of equipment described in curve that border temperature changes over time, same day previous year changes over time, and calculate history
Current temperature rise value；It obtains measured by same day electric current, same day environment temperature and the Radio infrared temperature measuring equipment of the equipment
The equipment work as degree/day；And calculate same day current temperature rise value；Temperature correction value is obtained, described after correcting set is finally obtained
Standby real time temperature.However, the patent does not improve temperature map mutually ratio property.
Summary of the invention
For this purpose, the present invention proposes a kind of power equipment infrared measurement of temperature method and device based on affine transformation, by affine
Transformation adjusts the temperature map shot every time to same angle, improves temperature map mutually than property, and can reduce to staff
Technical requirements.
The technical scheme adopted by the invention is as follows:
Power equipment infrared measurement of temperature method based on affine transformation, comprising the following steps:
Step 1. selects power equipment optimum temperature map visual angle, shoots and stores reference temperature map；
Step 2. selects three pixel reference point coordinates in map, is denoted as A (x1, y1), B (x2, y2), C (x3, y3)；
When step 3. actual photographed, selects any angle and distance to carry out temperature map to power equipment and shoot；
Step 4. finds the corresponding position coordinates of pixel reference point in actual photographed map, is denoted as A ' (x1 ', y1 '), B '
(x2',y2'),C'(x3',y3')；
Step 5. passes through given reference point coordinate A (x1, y1), B (x2, y2), the position of C (x3, y3) and actual photographed
Coordinate A ' (x1 ', y1 '), B ' (x2 ', y2 '), and C ' (x3 ', y3 '), affine transformation matrix is calculated；
Step 6. is according to affine transformation matrix, by the hygrogram spectral transformation of actual photographed to reference temperature map；
Power equipment Temperature Distribution under step 7. viewing transformation to reference temperature map judges electric power according to temperature map
Equipment whether failure, and be saved into database；
Step 8. measures next time when, step 2- step 7 is repeated, and can sentence by comparing the difference of multiple temperature map
Disconnected power equipment whether there is failure.
Three pixel reference points are located at the outer boundary of reference temperature map, and on same circumference, the center of circle of the circumference
It is the geometric center of gravity of reference temperature map.
Affine transformation matrix is
(x, y) is the temperature map coordinates of actual photographed, and (u, v) is reference temperature map coordinates, by substituting into reference point
The position coordinates A ' (x1 ', y1 ') of coordinate A (x1, y1), B (x2, y2), C (x3, y3) and actual photographed, B ' (x2 ', y2 '), C '
(x3 ', y3 ') transformation matrix variable a1, b1, c1, a2, b2, c2 is calculated.
Power equipment infrared temperature measurement apparatus based on affine transformation, characterized by comprising:
Optical system, for obtaining power equipment image information；
Infrared detector, for obtaining the temperature map of actual photographed；
Central processing unit carries out affine transformation for the temperature map to actual photographed and obtains under reference temperature map visual angle
Temperature Distribution,
Display record system, for being shown to Temperature Distribution.
A kind of power equipment infrared measurement of temperature method and device based on affine transformation of the present invention, is made every time by affine transformation
The temperature map of shooting is adjusted to same angle, effectively improves temperature map mutually than property, and can be reduced and be shot skill to staff
The requirement of art.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples:
Power equipment infrared measurement of temperature method flow schematic diagram of the Fig. 1 based on affine transformation.
Fig. 2 realizes process schematic based on the power equipment infrared measurement of temperature method of affine transformation.
Fig. 2 (a) power equipment optimum temperature map visual angle schematic diagram；
The power equipment optimum temperature map visual angle schematic diagram of three pixel reference point coordinates of Fig. 2 (b) band；
Power equipment temperature map schematic diagram when Fig. 2 (c) actual photographed；
Power equipment temperature map schematic diagram when actual photographed of the Fig. 2 (d) with the corresponding position coordinates of pixel reference point；
Fig. 2 (e) uses affine transformation matrix by the hygrogram spectral transformation of actual photographed to reference temperature map schematic diagram；
Power equipment infrared temperature measurement apparatus schematic diagram of the Fig. 3 based on affine transformation.
1, power equipment optimum temperature map visual angle；2, power equipment temperature map when actual photographed；3, using affine
Transformation matrix is by the hygrogram spectral transformation of actual photographed to the temperature map at optimum temperature map visual angle；4, optical system.
Specific embodiment
Power equipment infrared measurement of temperature method based on affine transformation, comprising the following steps:
Step 1. selects power equipment optimum temperature map visual angle, shoots and store reference temperature map, as schemed (a) institute
Show.
Step 2. selects three pixel reference point coordinates in map, is denoted as A (x1, y1), B (x2, y2), C (x3, y3)；
As shown in Fig. 2 (b).
When step 3. actual photographed, selects any angle and distance to carry out temperature map to power equipment and shoot；Such as
Shown in Fig. 2 (c).
Step 4. finds the corresponding position coordinates of pixel reference point in actual photographed map, is denoted as A ' (x1 ', y1 '), B '
(x2 ', y2 '), and C ' (x3 ', y3 '), as shown in Fig. 2 (d).
Step 5. passes through given reference point coordinate A (x1, y1), B (x2, y2), the position of C (x3, y3) and actual photographed
Coordinate A ' (x1 ', y1 '), B ' (x2 ', y2 '), and C ' (x3 ', y3 '), affine transformation matrix is calculated.
Step 6. is according to affine transformation matrix, by the hygrogram spectral transformation of actual photographed to reference temperature map, such as Fig. 2
(e) shown in.
Power equipment Temperature Distribution under step 7. viewing transformation to reference temperature map judges electric power according to temperature map
Equipment whether failure, and be saved into database,
Step 8. measures next time when, step 2- step 7 is repeated, and can sentence by comparing the difference of multiple temperature map
Disconnected power equipment whether there is failure.
Three pixel reference points are located at the outer boundary of reference temperature map, and on same circumference, the center of circle of the circumference
It is the geometric center of gravity of reference temperature map.It is to be put to guarantee that three points are not collinear just can guarantee in this way on same circumference
Penetrate the calculating of transformation matrix.The center of circle is that geometric center of gravity is then to allow the dispersed distribution of three points as far as possible.
Affine transformation matrix are as follows:
(x, y) is the temperature map coordinates of actual photographed, and (u, v) is reference temperature map coordinates, by substituting into reference point
The position coordinates A ' (x1 ', y1 ') of coordinate A (x1, y1), B (x2, y2), C (x3, y3) and actual photographed, B ' (x2 ', y2 '), C '
(x3 ', y3 ') transformation matrix variable a1, b1, c1, a2, b2, c2 is calculated.
Affine transformation matrix is for realizing different perspectives to the transformation of same reference viewing angle.
Power equipment infrared temperature measurement apparatus based on affine transformation, comprising:
Optical system, for obtaining power equipment image information；Optical system model uses transmission-type infrared optical system,
Mainly it is made of each lens.
Infrared detector, for obtaining the temperature map of actual photographed；Infrared detector uses PIR-910 intelligent wireless quilt
The dynamic double infrared detectors of wide-angle.
Central processing unit carries out affine transformation for the temperature map to actual photographed, obtains reference temperature map visual angle
Under Temperature Distribution, central processing unit use Siemens S7-300 6ES7 312-1AE14-0AB0 CPU312 central processing unit.
Display record system, for being shown to Temperature Distribution.Display record system uses LED electronic display screen.
Power equipment image information is obtained by optical system, obtains the temperature map of actual photographed through infrared detector,
Then affine transformation is carried out by temperature map of the central processing unit to actual photographed, obtains the temperature under reference temperature map visual angle
Degree distribution, shows it finally by display record system, as shown in Figure 3.
Claims (3)
1. the power equipment infrared measurement of temperature method based on affine transformation, it is characterised in that the following steps are included:
Step 1. selects power equipment optimum temperature map visual angle, shoots and stores reference temperature map；
Step 2. selects three pixel reference point coordinates in map, is denoted as A (x1, y1), B (x2, y2), C (x3, y3)；
When step 3. actual photographed, selects any angle and distance to carry out temperature map to power equipment and shoot；
Step 4. finds the corresponding position coordinates of pixel reference point in actual photographed map, is denoted as A ' (x1 ', y1 '), B '
(x2',y2'),C'(x3',y3')；
Step 5. passes through given reference point coordinate A (x1, y1), B (x2, y2), the position coordinates of C (x3, y3) and actual photographed
A ' (x1 ', y1 '), B ' (x2 ', y2 '), and C ' (x3 ', y3 '), affine transformation matrix is calculated；
Step 6. is according to affine transformation matrix, by the hygrogram spectral transformation of actual photographed to reference temperature map；
Power equipment Temperature Distribution under step 7. viewing transformation to reference temperature map judges power equipment according to temperature map
Whether failure, and be saved into database；
Step 8. measures next time when, step 2- step 7 is repeated, and can judge electricity by comparing the difference of multiple temperature map
Power equipment whether there is failure.
2. the power equipment infrared measurement of temperature method based on affine transformation according to claim 1, it is characterised in that: three pixels
Reference point is located at the outer boundary of reference temperature map, and on same circumference, the center of circle of the circumference is reference temperature map
Geometric center of gravity；
Affine transformation matrix is
(x, y) is the temperature map coordinates of actual photographed, and (u, v) is reference temperature map coordinates, by substituting into reference point coordinate A
The position coordinates A ' (x1 ', y1 ') of (x1, y1), B (x2, y2), C (x3, y3) and actual photographed, B ' (x2 ', y2 '), C ' (x3 ',
Y3 ') transformation matrix variable a1, b1, c1, a2, b2, c2 is calculated.
3. the power equipment infrared temperature measurement apparatus based on affine transformation, characterized by comprising:
Optical system, for obtaining power equipment image information；
Infrared detector, for obtaining the temperature map of actual photographed；
Central processing unit carries out affine transformation for the temperature map to actual photographed and obtains the temperature under reference temperature map visual angle
Degree distribution,
Display record system, for being shown to Temperature Distribution.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112649095A (en) * | 2020-11-26 | 2021-04-13 | 江苏集萃未来城市应用技术研究所有限公司 | Large-range accurate temperature measurement system based on affine transformation and optical/infrared double lenses |
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