A measuring method of a flame temperature measuring system with a dual optical path optical structure
A technology of optical structure and measurement method, which is applied in the field of measurement, can solve high-demand problems, achieve the effects of improving accuracy, reducing the intensity of radiation light, and widening the unsaturated range
Inactive Publication Date: 2020-08-28
CHINA JILIANG UNIV
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Problems solved by technology
Flame temperature measurement has high requirements for transient measurement, and the use of a common dual optical path structure leads to large errors in measuring transient flame temperature
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Embodiment 1
[0012] A measurement method of a flame temperature measurement system with a dual optical path optical structure: obtained through a large number of experiments: at different temperatures, the ratio of the green base gray value R_G to the red base gray value R_R of the radiation picture using a red filter is approximately is a fixed value, set to K R_GR . Will K R_GR Defined as the compensation factor when using the red filter. The intercepted part of the experimental data is as follows:
[0013]
[0014] Note: The set temperature is the set temperature of the black body 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 R_G / R_R values are used for calculation in different temperature ranges, and finally the average value of R_G / R_R under differ...
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The invention provides a method for measuring a flame temperature measurement system of a double-optical-path optical structure, which relates to the technical field of measurement. One beam of radiation light emitted by the flame is divided into two beams of light splitting, and the two beams of splitting light are combined respectively through a red filtering piece and a green filtering piece.A CCD camera is used for shooting a radiation picture and transmitting the radiation picture to a computer, and the computer carries out filtering processing on the radiation picture, the green and red primary colors are separated. A flame temperature field is obtained through calculation by utilizing a double-color method temperature measurement principle formula. According to the invention, thetechnical problem that a single CCD camera double-color method is large in temperature measurement error in the prior art is solved. The invention is advantageous in that the double-optical-path optical structure simultaneously obtains the combustion conditions of the flame transient state in the two narrow band-pass ranges, the two paths of light rays are combined into one path, and the error caused by the fact that the two paths of radiation light rays are separated and received at the later stage of image radiation point position matching is avoided; the transient performance of flame burning is considered; the dual-optical-path optical structure can obtain a narrow-band-pass monochromatic radiation image, and conforms to the assumption of wavelength fixation in the double-color-methodtemperature measurement principle.
Description
technical field [0001] The invention relates to the field of measurement technology, in particular to a method for measuring the flame temperature field of a flame temperature measuring system with a dual optical path optical structure. Background technique [0002] The measurement of the flame temperature field is of great significance to judging and predicting the combustion state of the flame, and is a key issue in the field of combustion. With the development of the electronic industry, the non-contact colorimetric temperature measurement method based on the color CCD image sensor has been widely used due to its advantages of high temperature resistance, long life, high definition, sensitive response and stable operation. In the traditional two-color temperature measurement, because the high-temperature area of the flame has high radiation, it is easy to cause saturated pixels in the pictures taken by the CCD camera. In the two-color temperature measurement theory, th...
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IPC IPC(8): G01K11/00
CPCG01K11/00
Inventor 单良杨鹏孔明徐良刘维洪波郭天太赵军
Owner CHINA JILIANG UNIV