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针对海水折射率变化引起差分激光三角法溢油油膜厚度测量系统结果误差增大的问题,理论分析了海水折射率变化对厚度测量值的影响机理,研究了折射率变化与测量结果误差大小的关系。提出了基于二维曲面拟合的误差补偿方法。该方法通过采集不同厚度、不同折射率下的厚度测量值,利用二次多项式曲面拟合建立测量误差、厚度测量值和折射率之间的函数关系,根据测量值和折射率值,就可得到误差补偿值,进而实现对测量结果的补偿。通过对不同折射率、不同厚度陶瓷量块的补偿实验,结果表明补偿后的厚度测量值更接近真值,测量结果的误差显著降低。
Aiming at the problem that the variation of refractive index of seawater caused the error of measurement result of differential laser triangulation method, the influence mechanism of seawater refractive index change on thickness measurement was analyzed theoretically. The relationship between refractive index change and measurement error . An error compensation method based on two-dimensional surface fitting is proposed. In the method, the thickness measurement values at different thicknesses and different refractive indexes are collected, and the functional relationship between measurement error, thickness measurement and refractive index is established by quadratic polynomial surface fitting. Based on the measured values and the refractive index values, Error compensation value, and then to achieve the compensation of measurement results. Through the experiment of compensation for ceramic block with different refractive index and different thickness, the results show that the compensated thickness measurement is closer to true value and the error of measurement result is significantly reduced.