研究目的
Remote determination of the chemical homogeneity of surfaces.
研究成果
The method of laser thermal-image spectroscopy allows areas of different chemical composition (defects) to be studied on the surface by measuring the thermal radiation of the surface excited by laser radiation at the wavelength of the characteristic absorption band of the studied substance. Such areas of different chemical composition can be revealed on remote surfaces, regardless of their shape and size, which is important for solving problems in the field of medicine, surface restoration, forensic medical examination and others.
研究不足
The thermal-imaging method is unable to detect a defect on the surface when its temperature is close to the temperature of the surface itself. The development of a mathematical model of the temperature field on a surface with a defect has an uncertainty in the choice of arguments.
1：Experimental Design and Method Selection:
The method involves measuring the thermal radiation of a surface excited by laser radiation at the wavelength of the characteristic absorption band of the studied substance.
2：Sample Selection and Data Sources:
A set of samples with different absorption coefficients at the wavelength λ =
3：634 μm was prepared. The defect was represented by paint (gouache) with an effective layer thickness of 1 mm and a diameter of 25 mm. List of Experimental Equipment and Materials:
FLIR E8 thermal imager, LG155 laser (wavelength
4：634 μm). Experimental Procedures and Operational Workflow:
The suspected defect on the sample surface is irradiated with a laser. The radiation wavelength is selected in the region of the characteristic absorption band of the defect substance. The output radiation power P0 of the laser is selected based on calculations to ensure stability of the physical and chemical state of the sample.
5：Data Analysis Methods:
The defect heating time to a given temperature is measured and compared with the calculated value obtained under the condition that radiation is absorbed in the region of the characteristic absorption band of the defect substance.
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