层析测量聚合物材料内部连续变化的离面变形场

摘要

Phase-contrast spectral optical coherence tomography ( PC-SOCT ) method based on temporal phase unwrapping is proposed , for continuous measuring the depth-resolved deformation fields .The inter-ference pattern between reference plane and the sample is recorded firstly , and then the deformation field is evaluated after restoring the phase difference maps by temporal phase unwrapping algorithm .The ad-vantages of the method are high measurement speed , high sensitivity , and strong anti-noise ability .An experiment system with depth range of 6mm and depth resolution of 15μm is built, and the method is val-idated respectively by measuring the deformation of curing process and thermal deformation inside a sili -cone rubber film .It is proved that this method is very suitable for studying nondestructively the dynamic mechanical properties of internal polymers .%结合时域相位解卷绕和相位对照谱域光学相干层析技术，提出了一种层析测量聚合物材料内部连续变化离面变形场的方法。该方法通过实时拍摄参考面与被测样件之间的干涉条纹，利用时域相位解卷绕方法复原出真实相位，解调出离面变形场的连续变化过程。该方法的特点在于测量速度快、灵敏度高、抗噪能力强，可以实现连续变化下的变形场层析测量。文中搭建了一套测量深度为6 mm，深度分辨率为15μm的实验系统，通过测量硅胶薄膜材料在固化过程和热变形过程的离面变形场，验证了该方法的可靠性。结果表明，这种高精度层析测量方法特别适用于聚合物材料变形场的动态力学特性研究。