High-precision measuring device and method for two-dimensional thermal expansion coefficient of material surface

Abstract

The invention provides a high-precision measuring device and method for a two-dimensional thermal expansion coefficient of a material surface. The high-precision measuring device comprises a heating mechanism and a laser deformation measuring system, wherein the laser deformation measuring system comprises a laser, an optical splitter and a camera; the optical splitter splits laser emitted by the laser device to obtain multiple paths of split laser, and the multiple paths of split laser enter the camera through diffuse reflection of a to-be-tested piece; or the optical splitter splits the laser emitted by the laser device to obtain multiple paths of split laser, one part of the split laser directly enters the camera, and the other part of the split laser enters the camera through diffuse reflection of the test piece to be tested; the split laser entering the camera generates an interference image on the target surface of the camera. The device is advantaged in that measurement precision of the two-dimensional thermal expansion coefficient of the material surface is high, thermal deformation of all positions in the variable laser deformation measurement view field range can be measured, limitation of the number of measurement points is avoided, and accurate measurement performance and applicability of the thermal expansion coefficient of low-expansion-rate and anisotropic materials such as composite materials can be improved.

Description

technical field [0001] The invention relates to the technical field of measuring the coefficient of thermal expansion of materials, in particular to a high-precision measuring device and method for the two-dimensional thermal expansion coefficient of a material surface. Background technique [0002] Thermal expansion characteristics are one of the basic physical properties of materials. For structures subjected to alternating temperature loads, especially in the fields of aviation and aerospace, accurate thermal expansion coefficients are crucial to structural design. [0003] Common thermal expansion coefficient testing methods are mainly aimed at one-dimensional materials. The Chinese invention patent with publication number CN101140249A discloses a two-beam laser interferometry method for material thermal expansion coefficient, which involves two-beam laser interferometry for material thermal expansion coefficient. Place the sample to be tested in the high vacuum heating ...

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Problems solved by technology

[0006] In view of the above existing technologies, the inventor believes that the above technologies have insufficient measurement accuracy, limited number of measuring points, and can not realize the measurement of thermal expansion coefficient in any direction in the plane, low expansion rate of composite materials, anisotropic material thermal expansion coefficient less accurate measurement

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