CN108731837B - Measuring method of flame temperature measuring system with double-light-path optical structure - Google Patents

Measuring method of flame temperature measuring system with double-light-path optical structure Download PDF

Info

Publication number
CN108731837B
CN108731837B CN201810490194.6A CN201810490194A CN108731837B CN 108731837 B CN108731837 B CN 108731837B CN 201810490194 A CN201810490194 A CN 201810490194A CN 108731837 B CN108731837 B CN 108731837B
Authority
CN
China
Prior art keywords
red
green
filter
radiation
light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201810490194.6A
Other languages
Chinese (zh)
Other versions
CN108731837A (en
Inventor
单良
杨鹏
孔明
徐良
刘维
洪波
郭天太
赵军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Jiliang University
Original Assignee
China Jiliang University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Jiliang University filed Critical China Jiliang University
Priority to CN201810490194.6A priority Critical patent/CN108731837B/en
Publication of CN108731837A publication Critical patent/CN108731837A/en
Application granted granted Critical
Publication of CN108731837B publication Critical patent/CN108731837B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00

Abstract

The invention provides a measuring method of a flame temperature measuring system with a double-light-path optical structure, and relates to the technical field of measurement. A beam of radiation light emitted by the flame is divided into two beams of split light, the two beams of split light are combined after passing through a red filter and a green filter respectively, a CCD camera shoots a radiation picture and transmits the radiation picture to a computer, the computer carries out filtering treatment on the radiation picture and separates red and green primary colors, and a flame temperature field is obtained by calculation through a bicolor method temperature measurement principle formula. The invention solves the technical problem that the temperature measurement error of a single CCD camera in the prior art is larger by a two-color method. The invention has the beneficial effects that: the double-optical-path optical structure simultaneously obtains the transient combustion condition of flames in two narrow-band-pass ranges, combines two paths of light rays into one path, avoids errors caused by the fact that the two paths of radiation light rays are separately received and are matched with the positions of the radiation points of the later-stage pictures, and gives consideration to the transient combustion condition of the flames. The dual-optical-path optical structure can obtain a narrow-band-pass monochromatic radiation image and is more in line with the assumption of fixed wavelength in a two-color temperature measurement principle.

Description

Measuring method of flame temperature measuring system with double-light-path optical structure
Technical Field
The invention relates to the technical field of measurement, in particular to a method for measuring a flame temperature field of a flame temperature measurement system with a double-optical-path optical structure.
Background
The measurement of the flame temperature field has important significance for judging and predicting the combustion state of the flame, and is a key problem in the field of combustion. With the development of the electronic industry, the non-contact colorimetric thermometry based on the color CCD image sensor has the advantages of high temperature resistance, long service life, high definition, sensitive reaction, stable operation, etc., and is widely used. In traditional two-color method temperature measurement, because of the high radiation in the high temperature region of flame has very easily to lead to the picture that CCD camera shot to appear saturated pixel. In the theory of temperature measurement by the bicolor method, the used bicolor wavelength is a fixed value, and the light received by the CCD image sensor is light in a wide wavelength range, so that the traditional temperature measurement method directly using a CCD camera causes large temperature measurement error. Based on the above problems, a temperature measurement experiment for forming a dual optical path structure by using devices such as a monochromatic filter and a spectroscope has been studied. Common systems using dual-path spectroscopic structures can be divided into two cases, receiving radiation using two cameras and receiving radiation using one camera. The two cameras are used for receiving the light rays, and one camera is respectively arranged on each of the two paths of light rays formed after the light rays pass through the optical structure to receive the radiation light rays. The method has great operation difficulty when pictures are controlled to be shot and put in simultaneously, and is difficult to realize matching of the positions of the corresponding radiation points in the received pictures. The situation that one camera is used for receiving the radiation light is divided into two paths of radiation light which are simultaneously received by one camera and two types of filtered light which are received in a time-sharing mode through a mechanical structure. The invention discloses a detection method for simultaneously receiving two paths of radiation rays by one camera, and relates to a Chinese patent application publication No. CN101358881A, application publication No. 2009, 2, 4, and an invention patent application file named as a two-band colorimetric temperature measurement method based on a single color CCD camera. By utilizing the narrow-band filtering effect of the interference filter, two interference filters with different central wavelengths are spliced into a whole circle or directly utilizing the two-waveband interference filter, the full-waveband light is filtered into narrow-band light in two wavebands and then irradiated on a photosensitive unit of the color CCD camera, the voltage value output by a pixel sensing red and blue in the CCD corresponds to the radiation intensity value of the red and blue narrow-band waves, and after being corrected by a standard radiation source, the temperature value can be obtained according to the formula calculated by the colorimetry temperature. The invention discloses a single-camera dual-band molten pool colorimetric temperature measurement method and system, which is an invention patent application document named as a single-camera dual-band molten pool colorimetric temperature measurement method and system and is published in China patent application No. CN107167249A on 2017, 9 and 15, and discloses a time-sharing receiving system and a temperature measurement method for two kinds of filtered light rays through a mechanical structure. The method comprises the following steps: the method comprises the steps of light processing, image acquisition and colorimetric temperature calculation; dividing a beam of radiation light of a molten pool to be measured into a first light beam and a second light beam which have the same wavelength and intensity completely by using a spectroscope, obtaining a first filtering light beam and a second filtering light beam through a filter plate group, carrying out equal-time magnification on the first filtering light beam and the second filtering light beam by using a long working distance microscope head, and obtaining a real-time image by using a camera, wherein the real-time image comprises a first molten pool image and a second molten pool image which have different gray values and are completely the same in shape; and then, calculating by using the colorimetric temperature to obtain the real-time temperature of each point on the surface of the molten pool to be measured. The biggest problem of using one camera to receive radiation rays simultaneously is that the receiving positions of two images are different due to an optical structure, and the difficulty in realizing the coincidence matching of the radiation point pixels in the two images is large. The biggest problem is how to realize the image matching of the image formed by two paths of radiation rays corresponding to the radiation points, no matter one camera or two cameras are used for receiving. Flame temperature measurement has high requirements on transient measurement, and a common double-light-path structure causes a large error in measurement of the transient flame temperature.
Disclosure of Invention
In order to solve the technical problem that the temperature measurement error of a single CCD camera in the prior art is large by a double-color method, the invention provides a measurement method of a flame temperature measurement system with a double-light-path optical structure, and the purpose of improving the temperature measurement precision of the double-color method and considering the instantaneity of flame combustion is achieved.
The technical scheme of the invention is as follows: a measurement method of a flame temperature measurement system with a double-light-path optical structure comprises the following steps: a beam of radiation light emitted by the flame is divided into two beams of split light, the two beams of split light respectively pass through a red filter and a green filter and then are combined and emitted into a CCD camera, the CCD camera shoots a radiation picture and transmits the radiation picture to a computer, the computer performs filtering processing on the radiation picture and separates red and green primary colors, and a flame temperature field is calculated by utilizing a two-color method temperature measurement principle formula.
Preferably, the ratio of the green basic quantity gray-scale value R _ G under the red filter separated by the light splitting of the red filter to the red basic quantity gray-scale value R _ R under the red filter is approximately a fixed value, which is a compensation coefficient when the red filter is used.
Preferably, the ratio of the green filter lower red basic quantity gray-scale value G _ R to the green filter lower green basic quantity gray-scale value G _ G separated by the light splitting of the green filter is approximately a fixed value, which is a compensation coefficient when the green filter is used.
Preferably, the pure primary monochromatic components corresponding to the monochromatic filters are separated by using the compensation coefficients when the red filter is used and the compensation coefficients when the green filter is used.
Preferably, the red filter and the green filter are a red narrow band-pass filter and a green narrow band-pass filter respectively.
Compared with the prior art, the invention has the beneficial effects that: the double-optical-path optical structure simultaneously obtains the flame transient combustion condition in two narrow-band-pass ranges, combines two paths of light rays into one path, and avoids errors caused by the fact that the two paths of radiation light rays separately receive the processing of the position matching of the later-stage picture radiation points. The accuracy of the temperature measurement by the two-color method is improved, and the instantaneity of flame combustion is considered. The dual-optical-path optical structure can obtain a narrow-band-pass monochromatic radiation image and is more in line with the assumption of fixed wavelength in a two-color temperature measurement principle. The narrow band-pass filter can weaken the radiation light intensity of the measured object, widen the unsaturated range of the CCD image sensor and increase the temperature measuring range.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments.
Example 1:
a measurement method of a flame temperature measurement system with a double-light-path optical structure comprises the following steps: obtained by a large number of experiments: at different temperatures, the ratio of the green basic quantity gray value R _ G to the red basic quantity gray value R _ R of the radiation picture using the red filter is approximately a fixed value, and is set as KR_GR. Will KR_GRDefined as the compensation factor when using the red filter. A portion of the experimental data was intercepted as follows:
Figure BDA0001667478190000031
description of the drawings: the set temperature is the set temperature of the blackbody furnace; the exposure time is the exposure time set by the CCD camera. The experimental results show that: under the same temperature and different exposure time, the value of R _ G/R _ R is approximately unchanged. In actual calculation, in order to improve the accuracy, different values of R _ G/R _ R are used for calculation in different temperature ranges, and finally, the average value of R _ G/R _ R in different exposure times can be taken as the value of R _ G/R _ R, which is approximately a fixed value.
Similarly, at different temperatures, the ratio of the red basic quantity gray-scale value G _ R to the green basic quantity gray-scale value G _ G of the radiation picture using the green filter is approximately a fixed value, and is set as KG_RG. Will KG_RGDefined as the compensation factor when using the green filter. A portion of the experimental data was intercepted as follows:
Figure BDA0001667478190000032
Figure BDA0001667478190000041
a beam of radiation emitted by the flame is split into two beams of split light after being split. The information contained in the two beams is the same. The first beam of light in the two beams of light passes through a red filter, the red filter is a red narrow band-pass filter, and a green basic quantity gray value R _ G under a red filter and a red basic quantity gray value R _ R under the red filter are separated. The ratio of the two is:
Figure BDA0001667478190000042
the second beam of light in the two beams of light passes through the green filter, and the green filter is a green narrow band-pass filter, and the red basic quantity gray value G _ R under the green filter and the green basic quantity gray value G _ G under the green filter are separated. The ratio of the two is:
Figure BDA0001667478190000043
the two beams of light respectively pass through the red filter and the green filter and then are combined to enter the CCD camera. The CCD camera takes a radiation picture and transmits the radiation picture to the computer. The computer firstly uses median filtering to the radiation picture to reduce the noise interference of impurity particles on the light path and the radiation picture. The red and green primary colors are then separated.
And separating the red and green primary colors of the radiation picture by the computer, namely removing the red basic quantity gray value G _ R under the green filter and the green basic quantity gray value R _ G under the red filter in the radiation picture. Although the red and green filters are narrow band-pass filters, the radiation picture taken by the CCD camera can still detect the presence of a small number of green gray values when only the red filter is used due to the presence of the bandwidth; similarly, the radiation picture taken by the CCD camera can still detect the presence of a small number of red gray values when only the green filter is used. After the two paths of light are combined, the monochromatic components corresponding to the monochromatic filters separated from the radiation picture shot by the CCD camera are impure, so that the monochromatic components of the radiation picture need to be purified.
The gray value of the red basic quantity in the radiation picture is Ired. Red basis weight gray value IredThis can be actually measured by separating the R layer images of the RGB pictures using MATLAB software. Red basis weight gray value IredThe method comprises the following steps: a red base quantity gray value R _ R under a red filter and a red base quantity gray value G _ R under a green filter. The relationship among the three is as follows: i isredR _ R + G _ R. Substitution of the compensation factor K for use with a green filterG_RGThen, formula (1) is obtained: i isred＝R_R+KG_RG× G _ g. representing the gray level of the red component under the red filter in the radiation picture as R, we get formula (2) where R _ Ired-KG_RG×G_G。
The grey value of the green basic quantity in the radiation picture is Igreen. Green-red basis weight gray value IgreenIt can be actually measured by separating G-layer images of RGB pictures using MATLAB software. Green base quantity gray value IgreenThe method comprises the following steps: a green base quantity gray value G _ G under the green filter and a green base quantity gray value R _ G under the red filter. The relationship among the three is as follows: i isgreenG _ G + R _ G. Substitution of the compensation factor K for the use of a red filterR_GRThen, it is: i isgreen＝G_G+KR_GR× R _ R. the grey value of the green component under the green filter in the radiation picture is denoted as G, and formula (1) is substituted to obtain formula (3):
Figure BDA0001667478190000051
substituting the formula (2) and the formula (3) into a two-color method temperature measurement principle formula:
Figure BDA0001667478190000052
in the formula: c. CgThe calibration coefficient of the CCD camera can be obtained by calibration of a black body furnace; c2Is the Planck constant; lambda [ alpha ]r、λgThe central wavelength of the narrow band-pass filter of the red filter and the green filter. And calculating to obtain a flame temperature field T.

Claims (2)

1. A measurement method of a flame temperature measurement system with a double-light-path optical structure comprises the following steps: the method is characterized in that: the method is that a beam of radiation light emitted by the flame is divided into two beams of light beams, the two beams of light beams respectively pass through a red filter and a green filter and then are combined and emitted into a CCD camera, the CCD camera shoots a radiation picture and transmits the radiation picture to a computer, the computer carries out filtering processing on the radiation picture and red and green primary colors are separated, and a flame temperature field is obtained by calculation through a double-color temperature measurement principle formula; the ratio of the green basic quantity gray value R _ G under the red filter and the red basic quantity gray value R _ R under the red filter is separated through light splitting of the red filter is approximately a fixed value and is a compensation coefficient when the red filter is used; the ratio of the red basic quantity gray value G _ R under the green filter and the green basic quantity gray value G _ G under the green filter separated by the light splitting of the green filter is approximately a fixed value and is a compensation coefficient when the green filter is used;
the first beam of split in two bundles of splits passes through red filter plate, and red filter plate is red narrow band-pass filter plate, separates out under the red filter green basis volume grey scale value R _ G and the red filter under red basis volume grey scale value R _ R, then the ratio of the two is: r _ G/R _ R = KR_GR(ii) a The second beam splitting in the two bundles of beam splitting passes through green filter plate, and green filter plate is green narrow band-pass filter plate, separates out under the green filter red basis volume grey level G _ R and the green filter green basis volume grey level G _ G, then the ratio of the two is: g _ R/G _ G = KG_RG(ii) a Red basis weight gray value IredThe method comprises the following steps: the relationship between the red background gray value R _ R under the red filter and the red background gray value G _ R under the green filter is as follows: i isred= R _ R + G _ R, substituting the compensation coefficient K when using the green filterG_ RGThen obtainTo formula (1): i isred= R_R+KG_ RG* G_G；
And expressing the gray value of a red component under a red filter in the radiation picture as R to obtain a formula (2):
R= R_R = Ired-KG_ RG* G_G；
green base quantity gray value IgreenThe method comprises the following steps: the green basic quantity gray value G _ G under the green filter and the green basic quantity gray value R _ G under the red filter have the following relationship: i isgreen= G _ G + R _ G, substituting the compensation coefficient K when the red filter is usedR _ GRThen, it is: i isgreen= G_G+KR _ GRR _ R, representing the gray value of the green component under the green filter in the radiation picture as G, and substituting formula (1) to obtain formula (3):
G= G_G=（Igreen-KR _ GR* Ired）/（1- KR _ GR*KG _ RG）。
2. the method for measuring the flame temperature measuring system of the double-light-path optical structure as claimed in claim 1: the method is characterized in that: and separating pure basic monochromatic components corresponding to the monochromatic filter by using the compensation coefficient when the red filter is used and the compensation coefficient when the green filter is used.
CN201810490194.6A 2018-05-21 2018-05-21 Measuring method of flame temperature measuring system with double-light-path optical structure Expired - Fee Related CN108731837B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810490194.6A CN108731837B (en) 2018-05-21 2018-05-21 Measuring method of flame temperature measuring system with double-light-path optical structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810490194.6A CN108731837B (en) 2018-05-21 2018-05-21 Measuring method of flame temperature measuring system with double-light-path optical structure

Publications (2)

Publication Number Publication Date
CN108731837A CN108731837A (en) 2018-11-02
CN108731837B true CN108731837B (en) 2020-08-28

Family

ID=63937808

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810490194.6A Expired - Fee Related CN108731837B (en) 2018-05-21 2018-05-21 Measuring method of flame temperature measuring system with double-light-path optical structure

Country Status (1)

Country Link
CN (1) CN108731837B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109506810B (en) * 2018-11-29 2021-01-29 哈尔滨工业大学 Multicolor temperature measuring device and method for flame two-dimensional temperature field
CN109974893B (en) * 2019-03-27 2020-11-03 东南大学 Gradient refractive index flame three-dimensional temperature field measuring method
CN113804305B (en) * 2021-09-14 2024-04-09 新疆有色金属工业（集团）有限责任公司 Arc furnace flame temperature measurement method and system based on visual perception

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2880655B2 (en) * 1994-09-22 1999-04-12 アニマ電子株式会社 Automatic detection device for heat and the like and method of using the same
JP3115786B2 (en) * 1995-03-09 2000-12-11 ニッタン株式会社 Flame detection device and flame detection method
CN101358881A (en) * 2008-06-16 2009-02-04 北京航空航天大学 Two band color comparison temperature measurement method based on single colourful CCD video camera
CN101476939B (en) * 2009-02-12 2010-09-01 清华大学 Double-CCD temperature field measuring apparatus and method
CN102634632B (en) * 2012-05-09 2014-05-28 湖南镭目科技有限公司 System and method for detecting temperature of converter flame

Also Published As

Publication number Publication date
CN108731837A (en) 2018-11-02

Similar Documents

Publication Publication Date Title
EP3054273B1 (en) Colorimetry system for display testing
CN108731837B (en) Measuring method of flame temperature measuring system with double-light-path optical structure
CN101943604B (en) Temperature-measurement imaging system and measuring method thereof
US9188841B2 (en) Imaging device
CN110017904B (en) Multispectral radiation temperature measurement method based on CCD camera
CN111351578B (en) Temperature measurement system and method based on pixelized dual-waveband narrow-band optical filter array
US10323985B2 (en) Signal processing for tunable Fabry-Perot interferometer based hyperspectral imaging
US20180080825A1 (en) Calibration for fabry perot spectral measurements
JP2015132594A (en) Measuring apparatus, measuring system, and measuring method
TWI512274B (en) Method and apparatus for color calibration of imaging colorimeter
CN105049841B (en) The method for improving color camera coloration ability using the pre- optical filter of single channel
JP2002303553A (en) Method and device for measuring temperature distribution
RU93977U1 (en) MULTI-COLOR COLORIMETER
JP2002214047A (en) Measuring method and device for temperature distribution
JP2006071316A (en) Film thickness acquiring method
JP5297821B2 (en) Color measuring method and color measuring device
JP2007147507A (en) Spectrometry and optical spectrometer
KR102571243B1 (en) Colorimetry device and method
JP3811728B2 (en) Film thickness acquisition method
Gebejes et al. Color and image characterization of a three CCD seven band spectral camera
RU2366907C1 (en) Method for digital photoelectric colorimetry
WO2017188956A1 (en) Image-capture devices having a diffractive grating array
JP6815628B2 (en) Multispectral imager
JP2003166880A (en) Imaging device having temperature measuring means
WO2015071786A1 (en) Method for imaging of spectral reflectance at several wavelengths

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20200828