Topic
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.
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TL;DR: In this article, a flexible bending machine was made on the basis of a new method, idea which proposes to penetrate the tube into the die, since the area of bending is limited and the cross section of the tube is restrained by the die.
Abstract: A prototype flexible bending machine was made on the basis of a new method, idea which proposes to penetrate the tube into the die. Since the area of bending is limited and the cross section of the tube is restrained by the die, flattening, buckling and wrinkling at the inner wall of the tube can be prevented. The tube can be bent to any radius by using ths system. The effects of penetrated load flattening factor, variation factor of thickness, and bending radius are examined under various bending conditions. The results are concluded as follows: (1) In the beginning of bending, the penetrated load reaches the, maximum, and thereafter, the load decreases and remains constant as the bending continues smoothly. As the bending radius decreases the load increases. (2) The flattening factor increases as the bending radius decreases. The flattening nearly be prevented by the choice of bending conditions. (3) The reduce thickness of the inner wall of the tube is nearly prevented.
23 citations
Patent•
25 Jul 1996
TL;DR: In this article, an optical sensor comprising a light source, light detector and signal generator, and an optical fiber extending between the light source and detector is described, where the optical fiber includes a sensing length comprising a return bend in the fiber.
Abstract: There is disclosed an optical sensor comprising a light source, light detector and signal generator, and an optical fiber extending between the light source and detector. The optical fiber includes a sensing length comprising a return bend in the fiber, where the return bend has a bend radius less than or equal to 2.5 times the radius of the optical fiber. In one embodiment, the sensing length further includes a planar sensing surface. A method for detecting the presence of a medium in an environment using the optical sensor of the invention is also disclosed.
23 citations
TL;DR: In this paper , a wood-based e-skin with instrument-and naked eye-readable characteristics was sandwich assembled using silver nanowires and a super-flexible transparent wood (STW) film as an electrode and a pyramidal microstructure polydimethlysiloxane film as a stimuli-responsive layer.
23 citations
TL;DR: In this paper, a small SU-8 polymer strip waveguide with a small bending radius (150 mum) was designed and fabricated for a microracetrack resonator with a high index-contrast optical waveguide.
Abstract: Compact microracetrack resonator (MRR) devices are presented with small SU-8 polymer strip waveguides. The SU-8 strip waveguide has an SU-8 polymer core (n~1.573) , a SiO2 buffer (n~1.445), and an air cladding. The fabricated straight waveguide has a low propagation loss of about 0.1 dB/mm. With such a high index-contrast optical waveguide, a compact MRR with a small bending radius (~150 mum) are designed and fabricated. The measured spectral responses of the through/drop ports show a Q-factor of 8000.
23 citations
TL;DR: A novel optical fiber displacement sensor based on composite interference established within a balloon-shaped bent multimode (BSBM) fiber structure is described and experimentally demonstrated and could be a realistic candidate in the high-accuracy displacement measurement field.
Abstract: A novel optical fiber displacement sensor based on composite interference established within a balloon-shaped bent multimode (BSBM) fiber structure is described and experimentally demonstrated. The BSBM fiber structure is realized by bending a straight single-mode–multimode–single-mode (SMS) fiber structure into a balloon shape using a length of capillary tube to fix the shape of the structure. Owing to the bend in the multimode waveguide, the original undistorted multimode interference pattern is changed, and an extra Mach–Zehnder interferometer is effectively introduced within the multimode fiber (MMF) section at a suitable bending radius. This established composite interference greatly improves the displacement sensing performance of the SMS fiber structure. A maximum displacement sensitivity of 0.51 dB/μm over the displacement range of 0–100 μm at the operating wavelength of 1564.7 nm is achieved experimentally. Based on its easy fabrication process, low cost, and high measurement sensitivity, the sensor of this investigation could be a realistic candidate in the high-accuracy displacement measurement field.
23 citations