Bend radius

About: Bend radius is a research topic. Over the lifetime, 3303 publications have been published within this topic receiving 35415 citations. The topic is also known as: minimum bend radius.

Submarine electric cables

Abstract: The invention regards a submarine electric cable provided with a tubular stiffening-means in correspondence of the uneven stretches found at the depth of the body of water where the cable is laid. The invention also concerns a method for disposing said tubular stiffening-means around said cable, during the laying operation, on that tract of cable that is comprised between the capstan on the cable-ship and the surface of the water itself. According to this invention, said tubular stiffening-means is endowed with a rigidity that is greater than that of the cable itself - in such a way that the cable is not subject to any bend-ing surpassing the minimum bending radius admissible - i.e.beyond the value which gives origin to impairments in the cable itself. According to a preferred form of realization, said tubular stiffening-means is formed out of a plurality of tubular elements, each one of which is comprised by two shells having C-shaped cross-sections and annular corrugations. Said shells are connected to one another and joined also to the contiguous shells of the plurality, by means of 'collars' - each one of which is constituted by two semi-collars that are fixable to one another, having C-shaped cross-sections and annular corrugations that can be disposed in the annular corrugations of said shells.

Fiber optic load sensor

Abstract: The invention concerns a faseroptic load sensor with a support structure and at least one interference structure shaped like a wire, on which at least one optical fiber is displayed. The optical fiber is cleared through a wireshaped interference structure at intervals from the support structure so that a large number of bent spots occur. An additional pressure load on the optical fiber vertical to the support structure then causes changes in the bending radius of each bend spot.

Tunable Single-Polarization Single-Mode Negative-Curvature Fiber With an Asymmetrical Refractive Index Cladding for Mid-Infrared Region

Abstract: We propose a hollow-core negative-curvature fiber implementing tunable single-polarization single-mode operation at mid-infrared region. This fiber owns a symmetrical geometry structure and asymmetrical refractive index cladding composed by two kinds of mid-infrared glass with different refractive indexes. Single-polarization single-mode can be achieved for any wavelength within the wavelength range from 2.0 to 4.0 μm by linear stretching fiber structure in the scale to wavelength, which means that this fiber structure possesses an excellent tunability. We mainly focus on analyzing the properties of the negative-curvature fibers for the wavelength of 2.0, 3.0, and 4.0 μm. Numerical results show that the main single-polarization single-mode regions for these three fibers are 2.020–2.033 μm, 2.998–3.016 μm and 3.998–4.018 μm, respectively. The widest bandwidth reaches 20 nm. The polarization extinction ratios at the wavelength of 2.0, 3.0, and 4.0 μm are 3180, 5085, and 2870, respectively. In addition, these fibers can maintain good single-polarization single-mode performance under bending state. The critical bend radius of the fiber for 3.0 μm is as low as 6 cm.