15 February 1993 Biaxial testing of pericardium using electronic speckle-pattern interferometry (ESPI)
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An apparatus for measuring the mechanical properties of thin living biological membranes such as pericardium (the sac which encloses the heart) is presented. The apparatus, using 16 actuators to apply stresses in the plane of the membrane, measures in-plane displacements and strain by means of electronic speckle pattern interferometry (ESPI). As opposed to conventional speckle interferometers which use light reflected from the surface under test, the apparatus presented here collects the light transmitted through the membrane, as pericardium is translucent and reflects very little light. Furthermore, in order to be preserved in a healthy state, the biological membrane must be kept immersed in a bath of physiological solution during the measurement experiments. Results of mechanical stretch experiments are presented where the infinitesimal strain tensor components were measured over the entire surface of a 10 mm diameter circular specimen of pericardium.
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Paul G. Charette, Paul G. Charette, Ian Warwick Hunter, Ian Warwick Hunter, Peter J. Hunter, Peter J. Hunter, } "Biaxial testing of pericardium using electronic speckle-pattern interferometry (ESPI)", Proc. SPIE 1756, Interferometry: Applications, (15 February 1993); doi: 10.1117/12.140800; https://doi.org/10.1117/12.140800

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