CN107741276A - A kind of method for improving technics of temperature measurement precision with infrared thermal imager - Google Patents
A kind of method for improving technics of temperature measurement precision with infrared thermal imager Download PDFInfo
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- CN107741276A CN107741276A CN201710791946.8A CN201710791946A CN107741276A CN 107741276 A CN107741276 A CN 107741276A CN 201710791946 A CN201710791946 A CN 201710791946A CN 107741276 A CN107741276 A CN 107741276A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 14
- 230000005855 radiation Effects 0.000 claims abstract description 19
- 239000011159 matrix material Substances 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 13
- 238000012423 maintenance Methods 0.000 abstract description 3
- 239000003208 petroleum Substances 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000003745 diagnosis Methods 0.000 description 4
- 238000001931 thermography Methods 0.000 description 4
- 229910000661 Mercury cadmium telluride Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- WPYVAWXEWQSOGY-UHFFFAOYSA-N indium antimonide Chemical compound [Sb]#[In] WPYVAWXEWQSOGY-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/06—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/80—Calibration
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- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Radiation Pyrometers (AREA)
Abstract
The present invention relates to a kind of method for improving technics of temperature measurement precision with infrared thermal imager, it is demarcated using high-precision black matrix, the purpose of demarcation is that whole system is tested, and finds out the relation between blackbody temperature and image intensity value, and this relation is described with a look-up table.The radiation temperature of object is calculated using the gray value of image.Radiation temperature is scaled true temperature.Relative to traditional matched curve blackbody demarcation temp measuring method, blackbody demarcation is carried out using difference loop up table, increase thermometric pretreatment, increase the conversion to radiation temperature, obtain the true temperature value of target object, reduce the influence of target reflected radiation and background, atmospheric radiation to thermometric simultaneously, improve temperature measurement accuracy.The present invention is adapted to the application field that electric device maintenance, condition of a fire detection, petroleum pipeline detection etc. carry out thermometric detection using infrared detector.
Description
Technical field
The invention belongs to signal control process technology, is related to the side to the thermometric of radiation target using infrared detector
A kind of method, and in particular to method of substation equipment fault diagnosis infrared measurement of temperature.
Background technology
Converting station electric power equipment be chronically at open air high pressure, high temperature, high capacity working condition under, therefore be very easy to
Produce defect, deterioration, or even formed accident, therefore right place to electrical equipment carry out state-detection have with fault diagnosis
Important meaning.Power equipment is toward developing in non-oil ultra high vacuum system, miniaturization, closed, insulated type trend.Due to novel electric power apparatus knot
Structure closing, insulated with material, many traditional detection means are such as estimated, ear listens maintenance service to be no longer applicable.Electrical equipment is online
The detection means that detection technique turns into inevitable is monitored, and is developed rapidly.
It is a kind of important means of power equipment on-line checking using thermal defect detection of the infrared detector to electrical equipment.
Infrared hot detection technique is a kind of non-contact detecting technology, and electrical equipment can be found in time by not had a power failure according to electric heat distribution
Thermal defect, the safe operation to electrical equipment serve positive role.Infrared measurement of temperature is by many factors such as environment, temp measuring methods
Influence.Traditional matched curve blackbody demarcation temp measuring method is considers the influence of target background, atmospheric radiation, and the data spoke measured
Temperature is penetrated, non-genuine temperature, temperature measurement accuracy is low, and the application in the accurate field of temperature measurement such as electric power detection is greatly limited.
Infrared measurement of temperature precision is improved, finds power equipments defect in time, fault diagnosis false alarm rate is reduced, turns into hot research topic.
The content of the invention
Technical problems to be solved
In order to avoid the shortcomings of the prior art, the present invention proposes a kind of side for improving technics of temperature measurement precision with infrared thermal imager
Method, by traditional blackbody demarcation temp measuring method introduce difference table look-up demarcation, thermometric pretreatment and true temperature conversion etc.
Link, improve the temperature measurement accuracy of thermal imaging system.
Technical scheme
A kind of method of substation equipment fault diagnosis infrared measurement of temperature, it is characterised in that step is as follows：
Step 1, black matrix is demarcated：In each temperature value of the temperature value Tn=T0+ △ Tn of black matrix, the temperature is recorded
Thermal infrared imager gray value Gn corresponding to value, establishes temperature difference △ T0 and corresponding thermal infrared imager gray scale difference value △ Gn 1 a pair
The relation table answered：
| G0 | △G1 | △G2 | △G3 | …… |
| T0 | △T1 | △T2 | △T3 | …… |
Step 2, infrared signal pretreatment：The infrared image gray scale shot using median filtering algorithm to thermal infrared imager is believed
Breath is pre-processed, and eliminates the noise in infrared image；
Step 3, using image gray value calculate object radiation temperature：The image intensity value of target object is chosen first
G and by itself and benchmark gray value G.Compare, obtain gray scale difference value △ G=G-G.；
Then △ G are substituted into look-up table, obtain corresponding to temperature difference △ T, then on the basis of the radiation temperature of object temperature with
Temperature difference sum, i.e. Tr=T0+△T；
Step 4, true temperature conversion：Target is calculated by formula T={ 1/ ε [1/ τ * Trn- (1/ τ-ε) * Tqn] } 1/n
The true temperature of object.
Beneficial effect
A kind of method for improving technics of temperature measurement precision with infrared thermal imager proposed by the present invention, enters rower using high-precision black matrix to it
Fixed, the purpose of demarcation is that whole system is tested, and finds out the relation between blackbody temperature and image intensity value, and by this
Relation is described with a look-up table.The radiation temperature of object is calculated using the gray value of image.Radiation temperature is scaled very
Real temperature.
Relative to traditional matched curve blackbody demarcation temp measuring method, blackbody demarcation, increase are carried out using difference loop up table
Thermometric pre-processes, and increases the conversion to radiation temperature, obtains the true temperature value of target object, while reduce target reflected radiation
With the influence of background, atmospheric radiation to thermometric, temperature measurement accuracy is improved.
The present invention is adapted to electric device maintenance, condition of a fire detection, petroleum pipeline detection etc. and surveyed using infrared detector
The application field that temperature detector is surveyed.This temp measuring method adds the conversion of true temperature, measured value is really reflected target object
Temperature, improve temperature measurement accuracy.
Brief description of the drawings
Fig. 1 is infrared measurement of temperature FB(flow block) of the present invention
Fig. 2 is the infrared temperature measurement system theory diagram of the embodiment of the present invention
Embodiment
In conjunction with embodiment, accompanying drawing, the invention will be further described：
The infrared temperature measurement system theory diagram of the embodiment of the present invention is shown in accompanying drawing 2, including optical system, infrared detector and letter
Number processing module；Infrared detector obtains the infrared image of target by optical system, and infrared image passes through signal processing module
Data handling procedure obtain the true temperature of target object.Comprise the following steps that：
Step 1：Blackbody demarcation is carried out, blackbody demarcation is carried out from difference loop up table：
Before thermal imaging system dispatches from the factory, it is demarcated using high-precision black matrix, demarcating steps are as follows：
(l) by temperature T0 on the basis of the temperature setting in blackbody temperature source, and benchmark gray value G now is recorded.；
(2) temperature of black matrix is adjusted to Tn=T0+ △ Tn (n=1,2,3 ...), and recorded grey corresponding to the temperature value
Angle value Gn, temperature difference △ T0 are then inserted into look-up table with corresponding gray scale difference value △ Gn；
(3) repeat step 2, untill look-up table fills up；
Table 1 is incorporated after blackbody demarcation, in thermal imaging system：
| G0 | △G1 | △G2 | △G3 | …… |
| T0 | △T1 | △T2 | △T3 | …… |
Step 2, infrared signal pretreatment：Infrared image half-tone information is pre-processed using median filtering algorithm, disappeared
Except the noise in infrared image.
Step 3, radiation temperature calculate：The radiation temperature of object is calculated using the gray value of image, chooses object first
The image intensity value G of body and by itself and benchmark gray value G.Compare, obtain gray scale difference value △ G=G-G., then △ G are substituted into
Look-up table, corresponding temperature difference △ T are obtained, then temperature and temperature difference sum, i.e. T on the basis of the radiation temperature of objectr=T0+△
T；
Step 4, true temperature conversion：Target is calculated by formula T={ 1/ ε [1/ τ * Trn- (1/ τ-ε) * Tqn] } 1/n
The true temperature of object.When using the thermal imaging system of different-waveband, n value is different, for (8-13 μm) detections of HgCdTe
Device, n values are 4.09；For HgCdTe (6-9 μm) detector, n values are 5.33；For InSb (2-5 μm) detector, n values are
8.68。
Claims (1)
- A kind of 1. method for improving technics of temperature measurement precision with infrared thermal imager, it is characterised in that step is as follows：Step 1, black matrix is demarcated：In each temperature value of the temperature value Tn=T0+ △ Tn of black matrix, the temperature value pair is recorded The thermal infrared imager gray value Gn answered, establishes temperature difference △ T0 and corresponding thermal infrared imager gray scale difference value △ Gn are one-to-one Relation table：
G0 △G1 △G2 △G3 …… T0 △T1 △T2 △T3 …… Step 2, infrared signal pretreatment：The infrared image half-tone information that thermal infrared imager is shot is entered using median filtering algorithm Row pretreatment, eliminates the noise in infrared image；Step 3, using image gray value calculate object radiation temperature：Choose the image intensity value G of target object simultaneously first By itself and benchmark gray value G.Compare, obtain gray scale difference value △ G=G-G.；Then △ G are substituted into look-up table, obtains corresponding temperature difference △ T, then temperature and temperature on the basis of the radiation temperature of object Poor sum, i.e. Tr=T0+△T；Step 4, true temperature conversion：Target object is calculated by formula T={ 1/ ε [1/ τ * Trn- (1/ τ-ε) * Tqn] } 1/n True temperature.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562363A (en) * | 2018-05-04 | 2018-09-21 | 中国传媒大学 | Method for accurately measuring infrared radiation characteristic transient temperature field |
| CN110726475A (en) * | 2019-10-12 | 2020-01-24 | 浙江大华技术股份有限公司 | Infrared temperature measurement calibration method and device, infrared thermal imaging equipment and storage device |
| CN111024238A (en) * | 2019-11-28 | 2020-04-17 | 天津津航技术物理研究所 | Radiation calibration and temperature measurement method for uncooled temperature measurement thermal imager |
| CN111537074A (en) * | 2020-03-31 | 2020-08-14 | 深圳奥比中光科技有限公司 | Temperature measuring method and system |
| CN111595456A (en) * | 2020-05-31 | 2020-08-28 | 广西电网有限责任公司南宁供电局 | Method for improving temperature measurement precision of robot by adopting black body correction |
| CN113049109A (en) * | 2021-03-12 | 2021-06-29 | 红相股份有限公司 | Infrared temperature measurement method based on reference blackbody and computer readable storage medium |
| CN113340463A (en) * | 2021-06-29 | 2021-09-03 | 山东浪潮科学研究院有限公司 | Accurate human body temperature measurement system and method based on infrared camera |
| CN113375815A (en) * | 2021-03-31 | 2021-09-10 | 燕山大学 | Object surface temperature measuring method and system combining CCD and thermal infrared imager |
| CN113447131A (en) * | 2020-03-25 | 2021-09-28 | 山东大学 | Infrared thermal imaging field temperature measurement calibration device and method |
| CN113551786A (en) * | 2021-07-21 | 2021-10-26 | 昆明北方红外技术股份有限公司 | Infrared human body temperature measurement method and device based on double blackbodies |
| CN114441045A (en) * | 2022-01-28 | 2022-05-06 | 电子科技大学 | Method for accurately measuring radiation temperature |
| CN117232661A (en) * | 2023-11-16 | 2023-12-15 | 中国人民解放军63921部队 | Multichannel infrared radiation measurement system and multi-wavelength real-time temperature measurement method |
| EP4189342A4 (en) * | 2020-12-09 | 2024-01-03 | Zhejiang Pixfra Technology Co., Ltd. | Devices and methods for temperature measurment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103968958A (en) * | 2014-04-24 | 2014-08-06 | 清华大学 | Method for measuring dual-jet direct-current arc plasma space temperature field in real time |
-
2017
- 2017-09-05 CN CN201710791946.8A patent/CN107741276A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103968958A (en) * | 2014-04-24 | 2014-08-06 | 清华大学 | Method for measuring dual-jet direct-current arc plasma space temperature field in real time |
Non-Patent Citations (1)
| Title |
|---|
| 朱雁程等: ""红外热像仪中温度测试研究"", 《电子质量》 * |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562363B (en) * | 2018-05-04 | 2019-12-31 | 中国传媒大学 | Method for accurately measuring infrared radiation characteristic transient temperature field |
| CN108562363A (en) * | 2018-05-04 | 2018-09-21 | 中国传媒大学 | Method for accurately measuring infrared radiation characteristic transient temperature field |
| CN110726475A (en) * | 2019-10-12 | 2020-01-24 | 浙江大华技术股份有限公司 | Infrared temperature measurement calibration method and device, infrared thermal imaging equipment and storage device |
| CN110726475B (en) * | 2019-10-12 | 2020-12-04 | 浙江大华技术股份有限公司 | Infrared temperature measurement calibration method and device, infrared thermal imaging equipment and storage device |
| CN111024238A (en) * | 2019-11-28 | 2020-04-17 | 天津津航技术物理研究所 | Radiation calibration and temperature measurement method for uncooled temperature measurement thermal imager |
| CN113447131A (en) * | 2020-03-25 | 2021-09-28 | 山东大学 | Infrared thermal imaging field temperature measurement calibration device and method |
| CN111537074A (en) * | 2020-03-31 | 2020-08-14 | 深圳奥比中光科技有限公司 | Temperature measuring method and system |
| CN111595456A (en) * | 2020-05-31 | 2020-08-28 | 广西电网有限责任公司南宁供电局 | Method for improving temperature measurement precision of robot by adopting black body correction |
| EP4189342A4 (en) * | 2020-12-09 | 2024-01-03 | Zhejiang Pixfra Technology Co., Ltd. | Devices and methods for temperature measurment |
| CN113049109A (en) * | 2021-03-12 | 2021-06-29 | 红相股份有限公司 | Infrared temperature measurement method based on reference blackbody and computer readable storage medium |
| CN113375815B (en) * | 2021-03-31 | 2022-07-08 | 燕山大学 | Object surface temperature measuring method and system combining CCD and thermal infrared imager |
| CN113375815A (en) * | 2021-03-31 | 2021-09-10 | 燕山大学 | Object surface temperature measuring method and system combining CCD and thermal infrared imager |
| CN113340463A (en) * | 2021-06-29 | 2021-09-03 | 山东浪潮科学研究院有限公司 | Accurate human body temperature measurement system and method based on infrared camera |
| CN113551786A (en) * | 2021-07-21 | 2021-10-26 | 昆明北方红外技术股份有限公司 | Infrared human body temperature measurement method and device based on double blackbodies |
| CN114441045A (en) * | 2022-01-28 | 2022-05-06 | 电子科技大学 | Method for accurately measuring radiation temperature |
| CN114441045B (en) * | 2022-01-28 | 2023-07-04 | 电子科技大学 | Method for accurately measuring radiation temperature |
| CN117232661A (en) * | 2023-11-16 | 2023-12-15 | 中国人民解放军63921部队 | Multichannel infrared radiation measurement system and multi-wavelength real-time temperature measurement method |
| CN117232661B (en) * | 2023-11-16 | 2024-02-23 | 中国人民解放军63921部队 | Multichannel infrared radiation measurement system and multi-wavelength real-time temperature measurement method |
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Application publication date: 20180227 |