Geodesic
Fiber optic interferometric sensors of stress and acoustic pressure on twin-core waveguides
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 1 (1990), pp. 67-70

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Stress and acoustic pressure sensors in twin-core waveguides have been studied experimentally. By means of the phase shift of interference fringers realized in twin-core waveguides the sensitivities of stress and pressure sensors which are correspondingly $3~rad \cdot m\cdot H^{-1}$ and $6~rad\cdot m^{-1}\mu m^{-1}$ and their temperature properties have been defined. Some advantages of the twin-core sensor over the interferometric single-core sensors have been cleared up. 
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     author = {A. M. Galstian and V. M. Smbatian},
     title = {Fiber optic interferometric sensors of stress and acoustic pressure on twin-core waveguides},
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     pages = {67--70},
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A. M. Galstian; V. M. Smbatian. Fiber optic interferometric sensors of stress and acoustic pressure on twin-core waveguides. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 1 (1990), pp. 67-70. http://geodesic.mathdoc.fr/item/UZERU_1990_1_a10/