Showing papers on "Bend radius published in 2002"

Optical fiber enclosure system using integrated optical connector and coupler assembly

Abstract: An optical fiber enclosure system includes a plurality of integrated optical connector and coupler assemblies. The first optic coupler is integrated adjacent to the ferrule in the connector. In a preferred embodiment, the integrated optical connector coupler is constructed in a compact package such that when installed in the optical fiber enclosure no part of the coupler connector assembly protrudes beyond the footprint of the fiber enclosure and yet maintains an industry recommended minimum bend radius of 1.5 inches on the output cable ports thus allowing the fiber enclosure front panel to close without impinging on the cables of the assembly.

Method and waveguides for changing the direction of longitudinal vibrations

Abstract: A curved ultrasonic waveguide, as used in an ultrasonic surgical instrument, comprises two curved half-wave sections, having similar vibratory motion at their respective distal tips, which are integrally or compressively joined at the distal tips to create a single waveguide with a sharper bend radius than is conventionally possible. The resulting waveguide does not produce parasitic motion or generate excessive heat at the input or output portions of the waveguide.

Air trenches for sharp silica waveguide bends

Abstract: Air trench structures for reduced-size bends in low-index contrast waveguides are proposed. To minimize junction loss, the structures are designed to provide adiabatic mode shaping between low- and high-index contrast regions, which is achieved by the introduction of "cladding tapers." Drastic reduction in effective bend radius is predicted. We present two-dimensional (2-D) finite-difference time-domain/effective index method simulations of bends in representative silica index contrasts. We also argue that substrate loss, while present, can be controlled with such air trenches and reduced to arbitrarily low levels limited only by fabrication capabilities. The required trench depth, given an acceptable substrate loss, is calculated in three dimensions using an approximate equivalent current sheet method and also by a numerical solver for full-vector leaky modes. A simple, compact waveguide T-splitter using air trench bends is presented.

Cable clip with segregator and method

Abstract: A cable clip with cable segregator includes ends and a side defining an open space, a series of open ended slots for holding and organizing telecommunications cables defined in the open space and outer grooves for mounting the cable clip with segregator into a mounting opening. The slots can be deep enough to hold two cables and may have an interior profile with a narrow opening, a nominal width, and one or more widened portions for receiving cables of different sizes and shapes. The cable clip with cable segregator can also include trumpet flares around the edges of the ends and side to provide bend radius protection for cables passing through the clip. The present invention also relates to a cable riser with cable clips with segregators mounted in a wall of the riser to hold and organize telecommunications cables that pass into the riser. The present invention also relates to a cable riser with cable clips with segregators mounted in a wall of the riser to hold and organize telecommunications cables that pass into the riser, and cable routing clips mounted within the riser defining a plurality of vertical cable paths within the rises. The present invention also relates to a method of loading cable in the riser into a specific cable path based on the entry location through which the cable enters the riser.

Fabrication and characterization of U-shaped fiber-optic pH probes

Abstract: Fabrication and characterization of U-shaped fiber optic pH probes utilizing evanescent field absorption spectroscopy and dye doped sol–gel immobilization technology are presented. The U-shaped probe is used to increase the evanescent field in the film and hence its interaction with the dyes present in the film. The influences of bending radius of the probe and the numerical aperture of the fiber on the sensitivity of the sensor are studied. It has been shown that, for a given pH, as the bending radius of the U-shaped probe decreases the sensitivity of the sensor increases. Further, for a given bending radius and the fiber core diameter, increase in the numerical aperture of the fiber increases the sensitivity of the pH sensor. The response time of the sensor reported in the present study is approximately 15 s.

Optical fiber management system and method

Abstract: An optical fiber ramp management system provides a system, device and method for organizing, managing and storing optical fiber during and after the production of an opto-electronic assembly. Opto-electronic components are arranged on a substrate located at a first level so as to define a space between the components. The space defines an optical fiber pathway along the surface of the substrate through which optical fibers formed as fiber bundle travel. A ramp supports the fiber bundle as it extends from the substrate to a storage tray located at a second level. The optical fibers are retained on the storage tray as a plurality of unconstrained loops. The pathway, ramp and tray are formed to maintain the radius of curvature of the optical fiber at or above the minimum bend radius of the fiber.

Limit-Load Analysis of Pipe Bends Under Out-of-Plane Moment Loading and Internal Pressure

Abstract: The purpose of this work is to study the load-carrying capacity of pipe bends, with different pipe bend factor (h) values, under out-of-plane moment loading; and to investigate the effect of internal pressure on the limit moments in this loading mode. The finite element method is used to model and analyze a standalone, long-radius pipe bend with a 16-in, nominal diameter; and a 24-in, bend radius. A parametric study is performed in which the bend factor takes ten different values between 0.0632 and 0.4417 Internal pressure is incremented by 100 psi for each model, until the limit pressure of the model is reached. The limit moments were found to increase when the internal pressure is incremented. However, beyond a certain value of pressure, the effect of pressure is reversed due to the additional stresses it engenders. Expectedly, increasing the bend factor leads to an increase in the value of the limit loads. The results are compared to those, available in the literature, of a similar analysis that treats the in-plane loading mode. Pipe bends are found to have the lowest load-carrying capacity when loaded in their own plane, in the closing direction. They can sustain slightly higher loads when loaded in the out-of-plane direction, and considerably higher loads under in-plane bending in the opening direction.

Fiber optic cable outlet box

Abstract: A cable outlet box for in-wall installation is disclosed that is particularly well suited for optical fiber cable network applications. The outlet box is larger than conventional outlet boxes in the transverse direction, to allow optical fibers to be maintained with a bending radius that is greater than the optical fiber's minimum bending radius, the minimum radius beyond which damage to the optical fibers can result. The depth of the outlet box is selected to allow installation within walls without protruding from a wall. Cable retainers, about which an excess length of cable may be coiled, extend inwardly from the rear panel into the outlet box. An extension ring, similar to conventional extensions rings, but adapted to attach to the larger outlet box, extends through the wall panel thickness for receipt of fixtures such as fiber optic connector strips, low voltage copper communications strips, audio, video, security or other such cabling. The cable outlet box is also suited to mixed applications, allowing fiber optic cables and low voltage cables to share a single outlet box.

Cable management bracket for a telecommunications rack

Abstract: A cable management bracket for a telecommunications rack. The bracket includes an elongated member having a length sized to extend across a width of the rack. A plurality of fingers project outwardly from the elongated member. The fingers are spaced apart along the length of the elongated member. Gaps sized to receive telecommunications cables are positioned between the fingers. Bend radius limiters are preferably connected to the fingers to prevent cables passing through the gaps from being bent beyond predetermined bend radius requirements.

Bending strain investigations on BSCCO(2223) tapes at 77 K applying a new bending technique

Abstract: A new bending device was developed which allows continuous change of the bending radius of the BSCCO tape sample at 77 K and a simultaneous measurement of the critical currents. The samples are mounted free between two clamps. The special geometry of the arrangement insures over the whole range a sample shape with homogeneous curvature on a circle line without the help of mechanical parts. This bending strain rig avoids effects from additional thermal stresses due to the cooling from room temperature (bending) to 77 K (critical current measurement). We mainly present measurements on different Ag/AgMg sheathed standard conductors. The results obtained with the new method will be compared for some selected samples with the bending strain behavior measured in the conventional way, applying the bent at RT. The potential of the method being suitable for standardized bending experiments will be discussed.

Fiber optic cable management enclosure with integral bend radius control

Abstract: An enclosure for use in a cable management system includes an outer shell having a generally rectangular shape and defining an interior space. The outer shell includes a bottom wall and a sidewall, with the sidewall defining a sidewall opening for access to the interior space. The bottom wall includes a curved portion adjacent to a first edge. A tray positioned within the interior of the enclosure includes a curved portion positioned adjacent to a first edge of the tray. The first edge of the bottom wall and the first edge of the tray are positioned adjacent to each other such that the curved portion of the bottom wall and the curved portion of the tray together form a first radius control structure positioned adjacent to the sidewall opening.

High-strength titanium-copper alloy, its manufacturing method, and terminal and connector using it

Abstract: PROBLEM TO BE SOLVED: To provide a titanium-copper alloy in which strength is improved without reducing flexibility. SOLUTION: The titanium-copper alloy has a composition consisting of ≥2.0 and ≤3.0 mass% Ti and the balance copper with inevitable impurities. Average grain size is ≤20 μm, 0.2% proof stress represented by (b) is ≥800 N/mm 2 . When W-bend tests are carried out in a direction perpendicular to the rolling direction, the bend radius ratio (bend radius/sheet thickness) which is represented by (a) and at which no cracking is brought about, satisfies the relation of a ≤0.05×b-40. COPYRIGHT: (C)2003,JPO

Fiber optic cable guide and method of application

Abstract: A fiber optic cable guide is disclosed for holding fiber optic cable in a bend without violating the minimum bend radius. The guide is a removably attachable to the fiber optic cable. Duplex embodiments and related methods of use are also disclosed.

Light Propagation in Multimode GRIN(graded-index) Fibers with Intrusion Sensing Capability

Abstract: An intrusion-sensitive capability of multimode graded-index (GRIN) optical fibers under bending has been investigated. In this system, the data light is transmitted in the fundamental mode while alarm monitor light is launched in a high-order mode at the same time. An attempted intrusion to drain data by bending the fiber results in greater attenuation of a monitor signal in higher order modes, thereby setting off an alarm at the receiver. Light propagation in a multimode graded-index fiber is also analyzed theoretically when the fundamental mode is selectively excited and the fiber is bent around a constant radius mandrel. The bending generates coupling between the various modes of the fiber. Power transitions of the fundamental mode by changing the bending radius were also analyzed numerically using program simulation. It is shown that Asawa-Taylor model[4] is valid up to 1cm of the radius of curvature of the fiber bend.

Fluid flow meter having an improved sampling channel

Abstract: A mass fluid flow sensor for determining the amount of fluid inducted into an internal combustion engine, for example, is disclosed. The mass fluid flow sensor includes an external intake fluid temperature element which improves the accuracy of the mass fluid reading. An external cold wire element is further provided which improves response time. The mass fluid flow sensor has an improved aerodynamic design which provides a lower system pressure drop. Moreover, the sensor is smaller and lighter and has fewer parts, thus providing better manufacturability. A molded one-piece isolated jet nozzle having a hot element disposed therein is included in the fluid sampling portion. The fluid sampling portion has a tubular sampling channel, wherein the sampling channel has one bend having a constant bend radius. Consequently, an improved lower internal flow passage pressure drop is achieved. Additionally, an improved signal to noise ratio, as well as a larger dynamic range is an advantageous consequence of the present invention. The present invention further provides improved electromagnetic interference performance.

Method and bend structure for reducing transmission line bend loss

Abstract: A dielectric transmission line bend structure includes an electrically conductive strip that forms a bend (e.g., a right angle bend). The inner edge of the bend includes a plurality of curved and/or straight line segments that result in the inner edge extending along a circuitous path in order to thereby reduce transmission line loss. A T-type junction includes a first or left side inner edge bending to the left and a second or right side inner edge bending to the right, with both inner edges including segments that result in greater inner edge lengths in order to increase current path lengths along the inner edges and thereby help reduce transmission line loss. A method of designing a transmission line bend structure includes the step of providing a preliminary bend structure design having an electrically conductive strip with at least one inner edge extending along a circuitous path between first and second inner edge end points on the strip. The method proceeds by producing simulation information indicative of transmission line loss characteristics of the preliminary bend structure design, and adjusting the length of the circuitous path according to the simulation information in order to produce an final design having improved transmission line loss characteristics.

Supercritical flow in manholes with a bend extension

Abstract: Bend manholes of sewers with 45° deflection angles are considered. Previous results are reconsidered by introducing the so-called bend extension. It is demonstrated that the discharge capacity of the 45°- and the 90°-bend manholes is identical if the bend extension, a U-shaped straight downstream portion, is added to the 45° manhole. In addition, the effect of the bend cover is analyzed as a general means to suppress shock waves. Both bend extensions and bend covers may be added to existing structures that convey discharge close to or over the design discharge. The hydraulics of bend manholes are analyzed in detail, including the wave profiles along the inner and the outer bend walls, the complete free surface, the recirculation zone, the pressure distributions on the walls and flow in the downstream sewer.

High strength titanium copper alloy, manufacturing method therefor, and terminal connector using the same

Abstract: A high strength titanium copper alloy consists of Ti at 2.0% by mass or more to 3.5% by mass or less; the balance of copper and inevitable impurities; an average grain size of 20 μm or less; and a 0.2% proof stress expressed by “b” of 800 N/mm 2 or more. The alloy further comprises a bending radius ratio (bending radius/sheet thickness) not causing cracking as expressed by “a” by a W-bending test in a transverse direction to a rolling direction, wherein “a” and “b” satisfy a≦0.05×b−40

Mass fluid flow sensor having an improved housing design

Abstract: A mass fluid flow sensor for determining the amount of fluid inducted into an internal combustion engine, for example, is disclosed. The mass fluid flow sensor includes an external intake fluid temperature element which improves the accuracy of the mass fluid reading. An external cold wire element is further provided which improves response time. The mass fluid flow sensor has an improved aerodynamic design which provides a lower system pressure drop. A molded one-piece isolated jet nozzle having a hot element disposed therein is included in a fluid sampling portion. The fluid sampling portion has a tubular sampling channel, wherein the sampling channel has one bend having a constant bend radius. Consequently, an improved lower internal flow passage pressure drop is achieved. Additionally, an improved signal to noise ratio, as well as a larger dynamic range is an advantageous consequence of the present invention. A three surface contact seal is provided between the sensor housing and an intake duct to further enhance the vibrational characteristics of the sensor.

Integrated bend limiter for fiber optic connectors

Abstract: A connector ( 10 ) comprising: a housing 11 having a front and rear orientation; a ferrule ( 12 ) disposed in the front of the housing and containing at least one fiber, a resilient member ( 13 ) disposed in the housing rearward of the ferrule ( 12 ); and a bendlimiter ( 14 ) disposed in the housing rearward of the resilient member, the bend limiter comprising a crimp portion ( 21 ) for interengaging the housing such that the bend limiter position with respect to the housing ( 11 ) is fixed, the crimp portion providing a backstop for compressing the resilient means ( 13 ) against the ferrule to urge the ferrule forward, the bend limiter also comprising an arcuate portion for dressing the fiber, the arcuate portion having a radius no less than the minimum bend radius of the fiber.

Semiconductor ring laser

Abstract: PROBLEM TO BE SOLVED: To enable an operation of a semiconductor ring laser by reducing the radius of a ring and to enable an easy control of the laser in a single lateral mode SOLUTION: The semiconductor ring laser comprises an active region formed as the embedding active region 1 of a linear embedding hetero structure or a ridge waveguide structure Reliability of the laser can be assured The waveguides 4 and 5 for forming the ring have a semiconductor high mesa waveguides having very strong light confinement of a lateral direction Accordingly, even when a bending radius is reduced, a radiating loss does not almost occur Thus, even when the radius of the ring is reduced, the ring laser can be operated

Bend radius control

Abstract: A bend radius control device for routing and maintaining at least a minimum bend radius of a cable. The bend radius control device includes an arcuate member having a channel and at least one holding portion. The holding portion is configured to hold the bend radius device to one or more cables inserted therein, while the channel is configured to support the one or more cables. A grommet may be used to with the holding portions to aid the holding portion in holding one or more cables inserted in the bend radius control device. The arcuate member has a bend radius that is greater than or equal to the minimum bend radius of one or more cables inserted therein. The bend radius control device is similar in size to a number of cables inserted therein and may be used in a space saving environment.

Construction and process of all-plastic cables for power and manual driving applications

Abstract: A plastic driving cable for attachment and use in driving systems. The plastic driving cable is comprised of an all-plastic inner core, with or without an outer jacket, and all-plastic molded end fittings. The inner core has a configuration of interwoven or bundled fibers of high performance polymer providing a cable of increased strength and flexibility that fits a smaller bending radius and has high performance at low temperatures. The outer jacket comprises a non-metallic material that surrounds the inner core providing improved performance at low temperatures.

System and method for using bent pipes in high-purity fluid handling systems

Abstract: A novel method for bending tubes suitable for use in high-purity fluid handling systems includes selecting a tube made from a material having a grain-size number of at least 5, and forming a bend in the tube with a bend radius of greater than 1.5 times the diameter of the tube. Tubes bent according to the present invention are incorporated into high-purity systems as supply lines, product lines, and vacuum forelines, without the need for post-bend heat treatment or polishing.

High-strength TiCu alloy, its making process and connector with the alloy

Abstract: A high strength titanium copper alloy consists of Ti at 2.0% by mass or more to 3.5% by mass or less; the balance of copper and inevitable impurities; an average grain size of 20 μm or less; and a 0.2% proof stress expressed by “b” of 800 N/mm2 or more. The alloy further comprises a bending radius ratio (bending radius/sheet thickness) not causing cracking as expressed by “a” by a W-bending test in a transverse direction to a rolling direction, wherein “a” and “b” satisfy a≰0.05×b−40

Fluid passage having bend part

Abstract: PROBLEM TO BE SOLVED: To provide a fluid passage having a bend part where an increase of pressure loss caused by providing the bend part is effectively suppressed, while avoiding deteriorations of installation performance and mounting performance. SOLUTION: In a bend pipe, its linear part 2 is formed with a circular cross section and the bend part 3 with a bent pipe axis is formed in a midway part of the linear part. A cross section perpendicular to the pipe axis of the bend part 3 is formed so that a curvature of an inner wall 3a of a bending inner side is smaller in comparison with a curvature of an inner wall 3b of a bending outer side. A passage cross section of such a bend part 3 is deflected toward the bending inner side, it has a large passage area, and a flow velocity of exhaust gas flowing in the bending inner side of the bend part 3 is locally reduced. COPYRIGHT: (C)2003,JPO