RESUMEN
In this paper, a highly-sensitive distributed shape sensor based on a multicore fiber (MCF) and phase-sensitive optical time-domain reflectometry (φ-OTDR) is proposed and experimentally demonstrated. The implemented system features a high strain sensitivity (down to â¼0.3 µÉ) over a 24â m-long MCF with a spatial resolution of 10â cm. The results demonstrate good repeatability of the relative fiber curvature and bend orientation measurements. Changes in the fiber shape are successfully retrieved, showing detectable displacements of the free moving fiber end as small as 50â µm over a 60â cm-long fiber. In addition, the proposed technique overcomes cross-sensitivity issues between strain and temperature. To the best of our knowledge, the results presented in this work provide the first demonstration of distributed shape sensing based on φ-OTDR using MCFs. This high-sensitivity technique proves to be a promising approach for a wide range of new applications such as dynamic, long distance and three-dimensional distributed shape sensing.
RESUMEN
We present the surgical implantation of the Edwards Inspiris Resilia® aortic valve in mitral position for mechanical mitral valve failure in a severely ill infant after valve replacement because of anomalous origin of the left coronary artery from the pulmonary artery. The biological valve was chosen because the child could not receive oral anticoagulation and was for several months on heparin infusion. The procedure was safely performed with good haemodynamic result.
Asunto(s)
Anomalías Múltiples , Válvula Aórtica/cirugía , Procedimientos Quirúrgicos Cardíacos/métodos , Anomalías de los Vasos Coronarios/cirugía , Prótesis Valvulares Cardíacas/efectos adversos , Insuficiencia de la Válvula Mitral/cirugía , Válvula Mitral/cirugía , Válvula Aórtica/diagnóstico por imagen , Angiografía Coronaria , Anomalías de los Vasos Coronarios/diagnóstico , Ecocardiografía , Femenino , Estudios de Seguimiento , Humanos , Lactante , Válvula Mitral/diagnóstico por imagen , Insuficiencia de la Válvula Mitral/diagnóstico , Diseño de Prótesis , Falla de Prótesis , ReoperaciónRESUMEN
We discuss the theoretical aspects of core-to-core power transfer in multicore fibers relying on supermode theory. Based on a dual core fiber model, we investigate the consequences of this approach, such as the influence of initial excitation conditions on cross talk. Supermode interpretation of power coupling proves to be intuitive and thus may lead to new concepts of multicore fiber-based devices. As a conclusion, we propose a definition of a uniform cross talk parameter that describes multicore fiber design.
