The coherent gradient sensor for film curvature measurements at cryogenic temperature.
The coherent gradient sensor for film curvature measurements at cryogenic temperature.
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DOI：
10.1364/oe.21.026352
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发表时间：
2013-11
期刊：
影响因子：
3.8
通讯作者：
Cong Liu;Xingyi Zhang;Jùn Zhou;Youhe Zhou;Xue Feng
中科院分区：
文献类型：
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作者：
Cong Liu;Xingyi Zhang;Jùn Zhou;Youhe Zhou;Xue Feng
介绍了一种用于测量低温下薄膜-衬底系统曲率和非均匀曲率变化的相干梯度传感器（CGS）系统。成功地消除了制冷机与制冷机本身的界面对干涉图的影响。在此基础上，利用推广的Stoney公式，得到了YBCO超导薄膜在30 ~ 150 K加热过程中的热应力（包括径向应力、周向应力和剪切应力）。以YBCO超导薄膜为例，成功地计算了其热应力。
Coherent Gradient Sensor (CGS) system is presented for measurement of curvatures and nonuniform curvatures changes in film-substrate systems at cryogenic temperature. The influences of the interface of refrigerator and itself on the interferograms which are accounting for the temperature effect are successfully eliminated. Based on the measurement technique, the thermal stresses (including the radial stress, circumferential stress and shear stress) of superconducting YBCO thin-film are obtained by the extended Stoney's formula during the heating process from 30K to 150K. Take the superconducting YBCO thin film as an example, the thermal stresses of which are gained successfully.