Interferometric Smart Material for Measuring Permanent Deformations

摘要

This paper has presented a novel inter-ferometric smart material using closely spaced micro-indentations as sensors for recording permanent deformations. The information can be retrieved from the interference fringe patterns of laser light reflected and diffracted from the ISM indentations. Practically, the interference fringes are monitored with linear photodiode arrays in conjunction with a microcomputer based digital data acquisition system. The measurement can be conducted at any convenient time and needs not conflict with in-situ operations. Validity and accuracy of the method have been confirmed by the comparison with standard measurements.