However, the existing thermal expansion measurement CTE technologies are sensitive to the micro-displacement between the measurement sensor and the test sample. Hence, developing a robust measurement method for testing the CTEs of dual-material lattices is meaningful to enhance measurement accuracy. The micro-displacement will generate unacceptable measurement error for high-precision measurement. During this long process, vibrations from the environment and the thermal deformation of the measuring device will cause micro-displacement between the measurement sensor and the test sample. Usually, the CTE measuring process takes a long time due to the slow heating. In order to guide their design and machining, the equivalent CTEs of the dual-material lattices must be accurately measured ahead. Various dual-material lattices have been proposed to obtain tailorable CTEs. It is especially useful for high-precision thermal expansion measurement of dual-material lattices.ĭual-material lattices with tailorable coefficients of thermal expansion (CTE) have been widely used in many applications. This method can improve the anti-interference ability and accuracy by eliminating the measurement error. The experiment results indicated that the method can avoid the measurement error induced by translation and has the potential to eliminate the measurement error induced by rotation using the rotational angle. A robust interferometric testing setup was established using a distance measuring set and two plane lenses. In the presented method, two parallel plane lenses are utilized to avoid the measurement error caused by translation, and the right lens is utilized as an angle detector to eliminate the measurement error caused by rotation. In this paper, we report a robust interferometric test method which can eliminate the measurement error caused by micro-displacement between the measurement sensor and the test sample. They ignore the measuring error caused by micro-displacement between the measurement sensor and the test sample. As supporting techniques for fabricating dual-material lattices with given coefficients of thermal expansion, the current existing methods for measuring the coefficient of thermal expansion have limited anti-interference ability. Dual-material lattices with tailorable coefficients of thermal expansion have been applied to a wide range of modern engineering systems.
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