Optical system for microscopic observation and strain measurement at high temperature
Optical system for microscopic observation and strain measurement at high temperature
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DOI：
10.1088/0957-0233/25/2/025002
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发表时间：
2014-02
影响因子：
2.4
通讯作者：
Yali Dong;H. Kakisawa;Y. Kagawa
中科院分区：
文献类型：
--
作者：
Yali Dong;H. Kakisawa;Y. Kagawa
研制了一种用于高温直接观察和应变测量的光学显微镜系统。在高温下的观测是使用紫外线CCD相机和紫外线照明，而热辐射是由紫外线透射滤光片切断。对多晶α-Al 2 O3的维氏压痕观察表明，在高达1400 °C的温度下仍能保持足够的图像对比度。通过测量多晶α-Al 2 O3的热应变，评价了该系统在数字图像相关应变测量中的应用潜力，得到的热膨胀系数与文献报道值吻合较好。
A system of optical microscopy has been developed for high-temperature direct observation and strain measurement. Observations at high temperatures are carried out using a UV CCD camera and UV illumination while thermal radiation is cut off by a UV light transmission filter. Observation of a Vickers indentation on polycrystalline α-Al2O3 revealed that sufficient image contrast was maintained up to 1400 °C. The potential of the proposed system for strain measurement via digital image correlation was evaluated through measuring the thermal strain of polycrystalline α-Al2O3; the obtained coefficient of thermal expansion agreed well with the reported values.