Wu Hanzhong, Zhang Fumin, Liu Tingyang, Li Jianshuang, Qu Xinghua
Opt Express. 2016 Oct 17;24(21):24361-24376. doi: 10.1364/OE.24.024361.
Two-color interferometry is powerful for the correction of the air refractive index especially in the turbulent air over long distance, since the empirical equations could introduce considerable measurement uncertainty if the environmental parameters cannot be measured with sufficient precision. In this paper, we demonstrate a method for absolute distance measurement with high-accuracy correction of air refractive index using two-color dispersive interferometry. The distances corresponding to the two wavelengths can be measured via the spectrograms captured by a CCD camera pair in real time. In the long-term experiment of the correction of air refractive index, the experimental results show a standard deviation of 3.3 × 10 for 12-h continuous measurement without the precise knowledge of the environmental conditions, while the variation of the air refractive index is about 2 × 10. In the case of absolute distance measurement, the comparison with the fringe counting interferometer shows an agreement within 2.5 μm in 12 m range.
双色干涉测量法对于校正空气折射率非常有效，特别是在长距离湍流空气中。因为如果环境参数无法以足够的精度测量，经验公式可能会引入相当大的测量不确定性。在本文中，我们展示了一种使用双色色散干涉测量法进行高精度空气折射率校正的绝对距离测量方法。对应于两个波长的距离可以通过一对CCD相机实时捕获的光谱图来测量。在空气折射率校正的长期实验中，实验结果表明，在没有精确环境条件知识的情况下，12小时连续测量的标准偏差为3.3×10 ，而空气折射率的变化约为2×10 。在绝对距离测量的情况下，与条纹计数干涉仪的比较表明，在12米范围内的一致性在2.5微米以内。
