反射率测量中的热辐射影响及其消除方法
Effects and elimination method of thermal radiation interference on reflectivity measurement
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摘要: 反射率测量过程中，被激光加热的材料发出热辐射光，对探测器测量存在明显干扰，给测量结果带来了较大误差，该现象普遍存在于以往的测试工作中。通过深入分析热辐射特性，在反射率测量装置中加入透过波长不同于加载激光波长的探测器，探测热辐射在该透过波长下的光强信号，并利用比对法消除了反射率测量过程中的热辐射干扰，使高温段的反射率测量精度得到较大提高。Abstract: In the process of measuring the reflectivity from material surface, the thermal radiation of the material irradiated by laser usually brings obvious interference on the measurement, thus introducing a large measurement error. The measurement accuracy of the reflectivity of the high temperature section can be greatly improved by following procedure: a detector whose transmitting wavelength is different from the loading laser’s wavelength is added first, thus the light strength signal of the thermal radiation at the laser loading section and the temperature dropping section after the laser stops is detected, and at last a comparison method is adopted to eliminate the thermal radiation interference in the process of reflectivity measurement．
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Key words:
- high-power laser /
- reflectivity /
- thermal radiation /
- integrating sphere
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