The non-contact temperature measurement method has been widely used in the field of temperature measurement. Based on element energy spectrum excitation and Laser induced breakdown spectroscopy (LIBS) mechanism, through the analysis of the intrinsic physical properties of the object under test, the excitation characteristic spectrum of heated internal elements in high temperature field was explored, in order to select effective detection wavelength of non-contact detection module, and designed a narrow-band filter module to compress the detection band. The accuracy of optical detection model can be improved. By preparing and analyzing samples of various elements, K and Cu were selected as external doping elements, the characteristic wavelength of K and Cu can be used as an effective detection wavelength, the CMOS camera was used to detect the burner flame under the different wavelengths and obtained the flame image. The experimental results validate the feasibility of the method.
When analyzing high-luminance objects such as plasma and high-temperature fireballs, in order to enhance the image of highlight targets, a false-color-depth method, similar to the reduction of the color depth, is proposed. Multiple false-color-depth figures with low color depth were acquired by this method and then multiply these low-color-depth figures to get a final figure. The processed figures, as a result, show that the low-brightness background of the image can be effectively attenuated by this simple algorithm, and the preliminary gray-level image segmentation can be performed on the high-luminance target.
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