We give a measuring example and the error analysis. It is found that the measuring precision of thickness is mainly determined by the spectral resolution of spectrometer.
文中给出了测量实例及详细的误差分析，发现厚度的测量精度主要由光谱仪的分辨率决定。
The result of error analysis shows that the relative error can be reduced efficiently by use of spectrometers with higher spectral resolution and longer spectral band to measure and calculate.
误差分析结果表明，通过提高光谱的最小分辨力及选择较长的光谱波段进行测量计算；
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