CN110207830A - A kind of the imaging sensor caliberating device and scaling method in nonblackbody radiation source - Google Patents
A kind of the imaging sensor caliberating device and scaling method in nonblackbody radiation source Download PDFInfo
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- 230000005855 radiation Effects 0.000 title claims abstract description 53
- 238000003384 imaging method Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000003595 spectral effect Effects 0.000 claims abstract description 52
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 22
- 239000011733 molybdenum Substances 0.000 claims abstract description 22
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 21
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 13
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000002196 Pyroceram Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 6
- 230000005457 Black-body radiation Effects 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000013307 optical fiber Substances 0.000 claims description 4
- 238000001228 spectrum Methods 0.000 claims description 3
- 238000010183 spectrum analysis Methods 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000012774 insulation material Substances 0.000 abstract description 3
- 238000012545 processing Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004861 thermometry Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910003978 SiClx Inorganic materials 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
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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
- G01J5/80—Calibration
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Abstract
The invention discloses a kind of imaging sensor caliberating device in nonblackbody radiation source and scaling method, the caliberating device includes entrance pipe, alundum tube and export pipeline, and the entrance pipe end is provided with gas mass flow controller；The thermocouple to measure reaction temperature is also inserted into the alundum tube, the thermocouple also passes through compensating line and is connected with PID controller, and the PID controller is communicated with laptop by Serial Port Line；The alundum tube surrounding is also surrounded with silicon carbide heater strip, is covered with thermal insulation material outside the silicon carbide heater strip, the geometric center of the length direction of the silicon carbide heater strip is provided with molybdenum target face；Described device further includes imaging sensor and spectrometer, is respectively used to the radiation information and Spectral Radiation Information of acquisition two, molybdenum target face end face figure like.Apparatus of the present invention can export the nonblackbody radiation strength information of known emissivity, and control the size of output radiation intensity, and operating process is simple, and cost is relatively low.
Description
Technical field
The present invention relates to technical field of image processing, demarcate more particularly to a kind of imaging sensor in nonblackbody radiation source
Device and scaling method.
Background technique
Thermometry based on Visual image processing is with noiseless to measurand, single detection information amount is big
And the advantages that advantage of lower cost, it can be applied to a variety of fields such as generating plant pulverized coal boiler, the small scale flame of Industrial Stoves and laboratory
The temperature online of conjunction detects.Before carrying out temperature measurement using the technology based on Visual image processing, first have to measuring device
Absolute radiation intensity calibration is carried out, the purpose of calibration is that the function established between relative image intensity and absolute radiation intensity closes
System, calibration process need to be completed by known temperature and the calibrated radiation source of emissivity, and in order to realize image intensity by it is weak to
The radiation intensity of strong calibration, calibrated radiation source must be controllable.Blackbody furnace emissivity in certain wave-length coverage is approximately 1,
And furnace temperature can be manually set, so that the absolute radiation intensity that grows from weak to strong, therefore image be calculated by Planck law
The absolute radiation intensity of thermometry is demarcated to carry out on blackbody furnace habitually in the past.
The blackness requirement of blackbody furnace is high, designs and manufactures requirement strictly, the blackbody furnace of domestic production at present usually can not
Realize high-precision, stable temperature and blackness output, therefore domestic universities' research institutes purchase the black of offshore company's production mostly
Body furnace, such as the M330 type of Mikron company, the U.S..M330 type blackbody furnace has wide temperature range, temperature resolution high and effectively black
The advantages that high is spent, but price is relatively expensive.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of imaging sensor marks in nonblackbody radiation source
Determine device and scaling method, the high-precision radiation calibration of imaging sensor can be carried out using the device and method.
The technical scheme adopted by the invention is that: a kind of imaging sensor caliberating device in nonblackbody radiation source, including water
Flat workbench, the caliberating device include entrance pipe, alundum tube and export pipeline, and the entrance pipe end is provided with gas
Mass flow controller, the nitrogen are flowed out from gas mass flow controller, and alundum tube is entered after entrance pipe, and
It is flowed out by export pipeline；The thermocouple to measure reaction temperature is also inserted into the alundum tube, the thermocouple also passes through
Compensating line is connected with PID controller, and the PID controller is communicated with laptop by Serial Port Line；
The alundum tube surrounding is also surrounded with silicon carbide heater strip, is covered with thermal insulating material outside the silicon carbide heater strip
Material, the geometric center of the length direction of the silicon carbide heater strip are provided with molybdenum target face；
The both ends of the alundum tube are sealed by sealing flange, the intermediate installation pyroceram view of the sealing flange
The both ends of window, the pyroceram form are also respectively provided with imaging sensor and spectrometer, for acquiring two, molybdenum target face
The radiation information of end face.
Further, the PID controller is also controlled to a power supply.
Further, the spectrometer front end is connected with collimation lens by optical fiber, and the collimation lens receives front
Parallel radiation information.
Further, the spectrometer also passes through USB data line and is communicated with laptop.
Further, the imaging sensor scaling method in nonblackbody radiation source, comprising the following steps:
A, the spectral emissivity and temperature in visible light wave range are obtained by spectrum analysis；
B, the radiation intensity of uncalibrated image sensor.
Further, in above-mentioned steps a, the spectral radiance under the different electric currents that spectrometer measures can use formula (1)
It is indicated,
I(λi)=ε (λi)·Ib(λi) (1)
I (λ in formula (1)i) it is spectral radiance, i=1,2,4....n, n are the limited spectral number that spectrometer detects
Mesh；ε(λi) it is spectral emissivity；Ib(λi) it is blackbody radiation intensity；According to Planck law, blackbody radiation intensity Ib(λi) can table
It is shown as:
C in formula (2)1And c2Respectively first radiation constant and the second radiation constant；T is molybdenum target surface temperature；Then formula (1) can
Become:
It is known quantity, n+1 unknown quantity, therefore can not acquire optimal solution that n is shared in equation (3)；Due to the light of spectrometer
Spectral resolution is 0.1nm or so, relatively high, it can be assumed that the spectral emissivity under adjacent wavelength is equal, it may be assumed that
ε(λ1)=ε (λ2)
ε(λ3)=ε (λ4)
ε(λ5)=ε (λ6)
...
ε(λn-1)=ε (λn) (4)
It can be that spectral emissivity under odd number wavelength represents spectral emissivity ε in this spectral region with number
(λi), then formula (3) may be expressed as:
At this point, sharing n/2+1 unknown quantity in equation (5), the number of n known quantity, unknown quantity is less than known quantity, equation
(5) there are optimal solutions, are solved using PSO ant group algorithm to equation (5), and formula (6) obtains minimum:
So far, temperature T and spectral emissivity the ε (λ in spectrometer end molybdenum target face is calculatedi), the difference electricity being calculated
The temperature value T flowed down, the spectral emissivity ε (λ under the different electric currents being calculatedi)。
Further, in above-mentioned steps b, calibration process considers the spectral response characteristic of imaging sensor, setting mark
Wavelength is longer, the channel signal-to-noise ratio relatively good camera R, G；Shown in the actual emanations intensity such as formula (7) that camera R, G are received:
In formula (7)WithThe respectively start-stop wavelength of imaging sensor R response channel；WithRespectively image
The start-stop wavelength of sensor G response channel；ηR(λi) be imaging sensor R response channel spectral response curve, ηG(λi) it is figure
As the spectral response curve of sensor G response channel；ε (the λ that formula (6) is calculatedi) and T substitute into formula (7) I can be calculatedR
And IG。
Compared with prior art, the beneficial effects of the present invention are:
1, device proposed by the present invention can export the nonblackbody radiation strength information of known emissivity, and can pass through
The size of temperature control output radiation intensity is adjusted, operating process is simple；In addition, cost is relatively low compared with blackbody furnace.
2, caliberating device controls the temperature of silicon carbide heater strip by PID controller；Fiber spectrometer on device is used for
Measure the spectral radiance in the molybdenum target face in alundum tube；Spectral radiance, which is obtained, based on measurement utilizes PSO ant group algorithm pair
Temperature and emissivity are carried out while being solved；The functional relation between the image intensity of imaging sensor and radiation intensity is established, and
And the temperature and emissivity obtained after calculating is substituted into, utilize Polynomial curve-fit image intensity and radiation intensity.
Detailed description of the invention
Fig. 1 is the imaging sensor caliberating device structural schematic diagram in nonblackbody radiation source of the present invention；
Fig. 2 is collimation lens light incidence figure of the present invention；
Fig. 3 is the spectral response curve of a COMS camera sensor；
Fig. 4 is that spectrometer measures the absolute spectral radiance under different electric currents；
Fig. 5 is 10 molybdenum target surface temperatures under the different electric currents being calculated；
10 molybdenum target surface launching rate under the different electric currents that Fig. 6 is calculated；
Polynomial fit function between Fig. 7 image intensity R and radiation intensity IR；
Polynomial fit function between Fig. 8 image intensity G and radiation intensity IG.
Wherein: 1- horizontal table, 2- spectrometer, 3- optical fiber, 4- collimation lens, 5- pyroceram form, 6- sealing
Flange, 7- laptop, 8-PID controller, 9- silicon carbide heater strip, 10- molybdenum target face, 11- thermocouple, 12- inlet tube
Road, 13- imaging sensor, 14- alundum tube, 15- compensating line, 16- power supply, 17- export pipeline, the control of 18- gas mass flow
Device, 19-USB data line, 20- Serial Port Line, 21- thermal insulation material.
Specific embodiment
In order to deepen the understanding of the present invention, present invention will be further explained below with reference to the attached drawings and examples, the implementation
Example for explaining only the invention, does not constitute protection scope of the present invention and limits.
As shown in Figure 1, need to be placed on horizontal table 1 when use device is demarcated；Experimentation is first by gas
The flow set of mass flow controller 18 is 100mL/min, and the nitrogen flowed out from gas mass flow controller 18 is by entering
Enter alundum tube 14 after mouth pipeline 12, and is flowed out by export pipeline 17；The purpose for being passed through nitrogen is to prevent molybdenum target face 10 from existing
It is aoxidized under high temperature；The power supply 16 that PID controller 8 can be started is passed through after nitrogen, and PID controller 8 passes through with laptop 7
Serial Port Line 20 is communicated, and target temperature can be set on laptop 7, feedback temperature is by the thermocouple in insertion alundum tube
11 measure；It is attached between thermocouple 11 and PID controller by 15 compensating lines；Hereafter it is looped around the carbon of 14 surrounding of alundum tube
SiClx heater strip 9 will heat alundum tube 14；
In the above-described embodiments, covering insulation material 21 except silicon carbide heater strip 9, prevents heat to scatter and disappear outward, so as to
Stable temperature field is formed in alundum tube 14；Molybdenum target face 10 is placed in the geometric center of the length direction of silicon carbide heater strip 9, with
Just identical temperature field is generated in two end faces in molybdenum target face 10；The both ends of alundum tube 14 are sealed by sealing flange 6, close
It seals the intermediate of flange 6 and pyroceram form 5 is installed, imaging sensor 13 and spectrometer 2 are respectively placed in pyroceram view
The both ends of window 5, for acquiring the radiation information of 10 two end faces in molybdenum target face；As shown in Fig. 2, spectrometer 2 passes through collimation lens 4
It is acquired radiation information, collimation lens 4 can only receive the parallel radiation intensity in front, to be accurately aimed at molybdenum target face 10；
The radiation information that collimation lens 4 receives is transferred in spectrometer 2 by optical fiber 3；Spectrometer 2 passes through USB data line 19 and notes
This computer 7 is communicated, and laptop 7 will analyze the spectroscopic data of acquisition, and the temperature in molybdenum target face 10 is calculated
And emissivity.
In the above-described embodiments, after the completion of spectrum data gathering, the plug-in on laptop 7 will pass through following calculation
Method carries out data processing, comprising the following steps: the spectral emissivity and temperature in visible light wave range a, are obtained by spectrum analysis；
B, the radiation of uncalibrated image sensor.
In the above-described embodiments, in above-mentioned steps a, the spectral radiance under the different electric currents that spectrometer measures is available
Formula (1) is indicated,
I(λi)=ε (λi)·Ib(λi) (1)
I (λ in formula (1)i) it is spectral radiance, i=1,2,4....n, n are the limited spectral number that spectrometer detects
Mesh, the spectral radiance under the different electric currents measured are as shown in Figure 4；ε(λi) it is spectral emissivity； Ib(λi) it is black matrix
Radiation intensity；According to Planck law, blackbody radiation intensity Ib(λi) may be expressed as:
C in formula (2)1And c2Respectively first radiation constant and the second radiation constant；T is molybdenum target surface temperature；Then formula (1) can
Become:
It is known quantity, n+1 unknown quantity, therefore can not acquire optimal solution that n is shared in equation (3)；Due to the light of spectrometer
Spectral resolution is 0.1nm or so, relatively high, it can be assumed that the spectral emissivity under adjacent wavelength is equal, it may be assumed that
ε(λ1)=ε (λ2)
ε(λ3)=ε (λ4)
ε(λ5)=ε (λ6)
...
ε(λn-1)=ε (λn) (4)
It can be that spectral emissivity under odd number wavelength represents spectral emissivity ε in this spectral region with number
(λi), then formula (3) may be expressed as:
At this point, sharing n/2+1 unknown quantity in equation (5), the number of n known quantity, unknown quantity is less than known quantity, equation
(5) there are optimal solutions, are solved using PSO ant group algorithm to equation (5), and formula (6) obtains minimum:
So far, temperature T and spectral emissivity the ε (λ in spectrometer end molybdenum target face is calculatedi), the difference electricity being calculated
The temperature value T that flows down is as shown in figure 5, spectral emissivity ε (λ under the different electric currents being calculatedi) as shown in Fig. 6.
In the above-described embodiments, in above-mentioned steps b, the spectral response characteristic of calibration process consideration imaging sensor, one
The spectral response curve of platform COMS camera sensor, as shown in figure 3, since the wavelength where camera channel B is shorter, signal-to-noise ratio phase
To poor, therefore the only channel R, G of calibration for cameras, shown in the actual emanations intensity such as formula (7) that camera R, G are received
In formula (7)WithThe respectively start-stop wavelength of imaging sensor R response channel；WithRespectively image passes
The start-stop wavelength of sensor G response channel；ηR(λi) be imaging sensor R response channel spectral response curve, ηG(λi) it is image
The spectral response curve of sensor G response channel；ε (the λ that formula (6) is calculatedi) and T substitute into formula (7) I can be calculatedRWith
IG；It is fitted R and I respectively using multinomialR, G and IGIt can obtain the functional relation between image intensity and radiation intensity, such as Fig. 7
With shown in Fig. 8.
What the embodiment of the present invention was announced is preferred embodiment, and however, it is not limited to this, the ordinary skill people of this field
Member, easily according to above-described embodiment, understands spirit of the invention, and make different amplification and variation, but as long as not departing from this
The spirit of invention, all within the scope of the present invention.
Claims (7)
1. a kind of imaging sensor caliberating device in nonblackbody radiation source, including horizontal table, it is characterised in that: the calibration
Device includes entrance pipe, alundum tube and export pipeline, and the entrance pipe end is provided with gas mass flow controller, institute
It states nitrogen to flow out from gas mass flow controller, alundum tube is entered after entrance pipe, and flow out by export pipeline；
The thermocouple to measure in-furnace temperature is also inserted into the alundum tube, the thermocouple also passes through compensating line and PID controller
It is connected, the PID controller is communicated with laptop by Serial Port Line；
The alundum tube surrounding is also surrounded with silicon carbide heater strip, and the silicon carbide heater strip outer face surface is covered with thermal insulating material
Material, the geometric center of the length direction of the silicon carbide heater strip are provided with molybdenum target face；
The both ends of the alundum tube are sealed by sealing flange, and the intermediate of the sealing flange installs pyroceram form,
The both ends of the pyroceram form are also respectively provided with imaging sensor and spectrometer, for acquiring two, molybdenum target face respectively
The image radiation information and Spectral Radiation Information of end face.
2. the imaging sensor caliberating device in nonblackbody radiation source according to claim 1, it is characterised in that: the PID
Controller is also controlled to a power supply.
3. the imaging sensor caliberating device in nonblackbody radiation source according to claim 1, it is characterised in that: the spectrum
Instrument front end is connected with collimation lens by optical fiber, and the collimation lens receives the parallel radiation information in front.
4. the imaging sensor caliberating device in nonblackbody radiation source according to claim 1 or 3, it is characterised in that: described
Spectrometer also passes through USB data line and is communicated with laptop.
5. the imaging sensor scaling method in nonblackbody radiation source according to claim 1, which is characterized in that including following
Step:
A, the spectral emissivity and temperature in visible light wave range are obtained by spectrum analysis；
B, the radiation intensity of uncalibrated image sensor.
6. the imaging sensor scaling method in nonblackbody radiation source according to claim 5, it is characterised in that: in above-mentioned step
In rapid a, the spectral radiance under the different electric currents that spectrometer measures can be indicated with formula (1),
I(λi)=ε (λi)·Ib(λi) (1)
I (λ in formula (1)i) it is spectral radiance, i=1,2,4....n, n are the limited spectral number that spectrometer detects；ε
(λi) it is spectral emissivity；Ib(λi) it is blackbody radiation intensity；According to Planck law, blackbody radiation intensity Ib(λi) can indicate
Are as follows:
C in formula (2)1And c2Respectively first radiation constant and the second radiation constant；T is molybdenum target surface temperature；Then formula (1) is variable are as follows:
It is known quantity, n+1 unknown quantity, therefore can not acquire optimal solution that n is shared in equation (3)；Due to the spectrum point of spectrometer
Resolution is 0.1nm or so, relatively high, it can be assumed that the spectral emissivity under adjacent wavelength is equal, it may be assumed that
ε(λ1)=ε (λ2)
ε(λ3)=ε (λ4)
ε(λ5)=ε (λ6)
...
ε(λn-1)=ε (λn) (4)
It can be that spectral emissivity under odd number wavelength represents spectral emissivity ε (λ in this spectral region with numberi), then formula
(3) it may be expressed as:
At this point, sharing n/2+1 unknown quantity in equation (5), the number of n known quantity, unknown quantity is less than known quantity, equation (5)
There are optimal solutions, are solved using PSO ant group algorithm to equation (5), and formula (6) obtains minimum:
So far, temperature T and spectral emissivity the ε (λ in spectrometer end molybdenum target face is calculatedi), under the different electric currents being calculated
Temperature value T, the spectral emissivity ε (λ under the different electric currents being calculatedi)。
7. the imaging sensor scaling method in nonblackbody radiation source according to claim 5, it is characterised in that: in above-mentioned step
In rapid b, calibration process considers the spectral response characteristic of imaging sensor, and setting mark wavelength is longer, and signal-to-noise ratio is relatively good
The channel camera R, G；Shown in the actual emanations intensity such as formula (7) that camera R, G are received:
In formula (7)WithThe respectively start-stop wavelength of imaging sensor R response channel；WithRespectively image sensing
The start-stop wavelength of device G response channel；ηR(λi) be imaging sensor R response channel spectral response curve, ηG(λi) it is that image passes
The spectral response curve of sensor G response channel；ε (the λ that formula (6) is calculatedi) and T substitute into formula (7) I can be calculatedRAnd IG。
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| CN112710400A (en) * | 2020-12-23 | 2021-04-27 | Oppo（重庆）智能科技有限公司 | Temperature measuring method and device, storage medium and electronic equipment |
| CN114047154A (en) * | 2021-06-02 | 2022-02-15 | 中国矿业大学 | Device and method for on-line measurement of burnout degree of pulverized coal boiler based on spectral analysis |
| CN114076638A (en) * | 2020-08-20 | 2022-02-22 | 北京振兴计量测试研究所 | High-temperature calibration method and device for threshold material |
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