The coherent gradient sensor for film curvature measurements at cryogenic temperature | Zendy

Cong Liu | Zendy; Xingyi Zhang | Zendy; Jùn Zhou | Zendy; Youhe Zhou | Zendy; Xue Feng | Zendy

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The coherent gradient sensor for film curvature measurements at cryogenic temperature

Author(s) -

Cong Liu,

Xingyi Zhang,

Jùn Zhou,

Youhe Zhou,

Xue Feng

Publication year - 2013

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.21.026352

Subject(s) - materials science , curvature , temperature gradient , optics , thin film , stress (linguistics) , substrate (aquarium) , refrigerator car , cryogenics , temperature measurement , cryogenic temperature , thermal , shear stress , composite material , physics , thermodynamics , nanotechnology , linguistics , philosophy , geometry , mathematics , oceanography , quantum mechanics , geology

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.

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