There's more to reflectance spectroscopy than lux
There's more to reflectance spectroscopy than lux
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反射光谱不仅仅是勒克斯
DOI：
10.1080/19455224.2018.1463920
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发表时间：
2018
影响因子：
0.8
通讯作者：
Beeby A
中科院分区：
文献类型：
--
作者：
Beeby A
光纤反射光谱法被广泛用作分析颜料和油漆等有色材料的工具。我们描述了一种新的设计为一个FORS探头，这是举行一些5厘米远离样品表面和询问一个点的直径为2毫米，提供了一个显着的优势，现有的方法。光谱仪采用1250勒克斯的照度，相当于整个可见光谱的平均值为0.5mWcm− 2。光谱测量需要不到一秒的时间，确保样品光降解的风险最小。在这些条件下，照明区域没有可检测到的温升。将照度提高到25mWcm−2以上，这比我们的测量所需的照度高得多，导致模型手稿中的局部温度显著升高。这表明在使用这种技术分析珍贵遗产项目时需要谨慎。
Fibre-optic reflectance spectroscopy is widely used as a tool for the analysis of coloured materials such as pigments and paints. We describe a new design for a FORS probe which is held some 5cm away from the sample surface and interrogates a spot of 2mm diameter, offering a significant advantage over existing methods. The spectrometer employs an illuminance of 1250lux, equivalent to 0.5mWcm−2averaged across the visible spectrum. The spectral measurements take less than a second ensuring that the risk of sample photodegradation is minimal. Under these conditions there is no detectable temperature rise of the illuminated area. Increasing the illuminance above 25mWcm−2, a light level significantly higher than that required for our measurements, gave rise to significant localised temperature rises in model manuscripts. This demonstrates the need for caution when using this technique for the analysis of precious heritage items.