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空间偏移拉曼光谱技术是近年来出现的一种光谱测量新技术,其光谱收集系统中收集透镜的焦点与入射激光的焦点在空间上偏移一定的距离。当激光入射到被测物质表面时,会在其表层成分中被散射或激发出宽带荧光,其中有一部分散射光将到达物质的深层成分,经多次散射后返回物质表面;到达物质内部不同深度的散射光返回后的位置与激发光入射点在物质表面上偏移不同的距离。
Spatial-offset Raman spectroscopy is a new spectroscopic measurement technique emerging in recent years. The focal point of the collecting lens in the spectral collection system is spatially offset from the focal point of the incident laser by a certain distance. When the laser incident on the surface of the measured material, it will be scattered in the surface composition or excited by a wideband fluorescence, some of which will reach the deep part of the light scattering material, after repeated scattering back to the material surface; to reach different depths within the material Of the scattered light returns after the position of the excitation light incident point on the surface of the material offset by a different distance.