259 results about "Fiber coil" patented technology

A fiber drop terminal may include a housing having an outer surface containing a plurality of receptacles. The housing may include a lower surface and an inner cavity. The fiber drop terminal may include a fiber storage cavity occupying a portion of the inner cavity. The storage cavity may store a plurality of fiber coils at an angle.

Methods and apparatus are provided for attenuating rotation rate errors in a resonator gyro. The gyro includes a ring resonator having a hollow core optical fiber coil and optical elements that are selected and/or oriented to reduce stray light that may be present in input light beams introduced to the ring resonator. The resonator has a predetermined mode. One of the optical elements partially transmits a portion of the input light beam to a first end of the fiber coil while partially transmitting a portion of the input light beam to a filter. Light having the predetermined mode is accepted into the first end of the fiber coil, and the filter accepts light of the input light beam having a corresponding mode. Transmission components of the circulating light beams indicates resonance peaks of the counter-propagating directions of the ring resonator.

The invention relates to a continuous type colored loose fiber machining device, and belongs to the technical field of loose fiber dyeing. The continuous type colored loose fiber machining device comprises a spray-rolling type drying machine, a coiling roller, a cold-batch fixation device, cotton conveying rollers, a spray-rolling type washing machine, a conveyor belt and a squeezing device in sequence. Loose fibers are subjected to spraying dyeing by being horizontally clamped by a transmission component of the spray-rolling type drying machine, the coiling roller is arranged on the rear portion of a lower guide belt of the spray-rolling type drying machine and coils the dyed loose fibers to be loose fiber coils, the loose fiber coils are transferred to the cold-batch fixation device for cold-batch fixation, the loose fiber coils are conveyed to the spray-rolling type washing machine through the cotton conveying rollers, spray washing is carried out on the cotton conveying rollers when the cotton conveying rollers are conveyed by being horizontally clamped through the transmission component of the spray-rolling type washing machine, the washed loose fibers fall down on the conveyor belt behind the spray-rolling type washing machine under the gravity of the loose fibers themselves, and the loose fibers are conveyed to the squeezing device for dewatering. The continuous type colored loose fiber machining device can continuously produce colored loose fibers, and greatly lower processing cost.

A fiber amplifier having two erbium doped fiber coils and a pump laser diode optically coupled, through a fiber array, to a planar lightwave circuit, is described. A photodetector array, a multiport free-space optical isolator, and a strip of thin-film gain flattening filter are attached to a side surface of the planar lightwave circuit, which has a tunable optical power splitter for variably splitting the optical pump power for the laser diode between the two erbium doped fiber coils, and variable tilters for correcting the gain tilt of the amplifier. The variable splitter and the tilters are thermally tunable Mach-Zehnder interferometers.

The invention discloses a fiber-optic loop structure wound in a vertically symmetrical cross manner for a fiber-optic gyroscope. The fiber-optic loop structure comprises a fiber-optic loop skeleton which comprises a wrapping post and a middle flange, wherein the middle flange is arranged at the periphery of the wrapping post, the middle flange is provided with a fiber passing notch, horizontally run-though bellmouth orifices are arranged on the wrapping post and the middle flange and are located at the symmetrical positions of the fiber passing notch, and a fiber outlet is formed on the middle flange. A vertically symmetrical crosswise winding method for the fiber-optic gyroscope comprises the following steps: 1, setting the midpoint of an optical fiber at the position of the fiber passing notch of a fiber-optic loop; 2, winding the optical fiber; and 3, leading the optical fiber into the fiber outlet. According to the invention, a fiber-optic coil is divided into an upper part and a lower part, and each of the two parts has one side which is free of structural restriction and is not compressed in conditions of vibration and temperature variation; and through cross winding, the coils at two sides both have forward and reverse optical fibers which are the same in length, so that temperature gradients in axial and radial directions have the same temperature modulation effect on the optical fibers.

A fiber optic ring interferometer, such as an interferometric fiber optic gyro (IFOG), with a sensing loop doubler. The IFOG device includes a light source, a circulator in optical communication with the light source and a photo diode, an integrated optical chip (IOC) capable of splitting light emitted from the circulator into two paths each of which is capable of being modulated, the IOC further being capable of combining light from each of the two paths when light travels in a direction towards the circulator, a fiber coil, and a polarization maintaining (PM) combiner/splitter disposed in between the IOC and the fiber coil. The PM combiner/splitter operates to send light through the fiber coil a first time in a first polarization state and to subsequently send the same light a second time through the fiber coil in a second orthogonal polarization state, whereby light travels twice the distance compared to a single loop IFOG device and, as such, effectively doubles the LD product.

The invention relates a method for making a sensor coil of a reflective optical fiber current sensor. A groove which takes the shape of the spiral of Archimedes is processed on a ring-shaped metallic framework, and sensitive fiber is wound in the groove; after filled with fiber paste and fixed, the groove is sealed; finally, the stress on the sensitive fiber is released by temperature ictus and vibration, thus causing the state of the sensitive fiber to be stable. The method of the invention can ensure that the sensitive fiber coil has good stability even under certain perturbation and can guarantee the ideal measuring precision; meanwhile, in the method of the invention, the metallic framework is adopted, so as to reduce the making difficulty and cost and realize the consistency of winding easily with respect to the technique.

The invention relates to a spray-rolling type loose fiber cold-batch dyeing process, and belongs to the technical field of loose fiber dyeing. The spray-rolling type loose fiber cold-batch dyeing process comprises the steps of spray-rolling type dyeing, coiling and batching fixation, cotton blanket type loose fibers are conveyed to a spray-rolling type dyeing device and horizontally conveyed by a guide belt, after a plurality of groups of spray-rolling dye with alternative squeezing and spraying, the loose fibers are coiled to be loose fiber coils, the loose fiber coils are subjected to the batching fixation at the room temperature for 10-12 hours to complete loose fiber dyeing, the spray-rolling type dyeing process comprises the steps of squeezing, spraying, squeezing, spraying, squeezing, spraying, squeezing, spraying, squeezing and spraying, in the squeezing process, the squeezing force on the loose fibers is 3-15 kg per square centimeters, and in the spraying process, the spraying amount of dyeing liquid is 1.5-2 times the conveying amount of the loose fibers. The spray-rolling type loose fiber cold-batch dyeing process can be used for continuous production, dyeing is even, and cost can be lowered to 1/3-1/5 of the original cost.

An optical coupling device for connecting hollow core optical fiber coils in a fiber optic gyro system. An example fiber optic gyro system includes a recirculator or an integrated optics chip, a fiber coil of hollow core optical fiber with first and second ends, and a coupling device that holds an end of the hollow core optical fiber in an enclosed cavity at some predefined distance from the recirculator or integrated optics chip. The coupling device includes a housing for rigidly holding the fiber end in position. The housing includes a cavity that receives the fiber end.

The invention relates to an airgel material reinforced by fiber reinforcement and its preparation method. The width of the material is 0.5-1.5 meters, and the length is 5-30 meters. Its composition includes silicon dioxide airgel and reinforced continuous fiber, and its weight ratio is 1:0.5-2.5. The present invention also relates to (1), limiting and winding the continuous reinforcing fiber into a winding unit while keeping a certain gap between the continuous fibers; (2), disposing silicon alkoxide, alcohol solvent and basic catalyst according to a certain ratio (3) Immerse the silica sol into the continuous reinforcing fiber winding unit through the impregnation process; (4) After the silica gel is aged for a certain period of time, the surface is treated with a hydrophobizing agent; (5) The silica gel containing silica gel The continuous fiber winding unit of glue is supercritically dried. The material prepared by the invention has large specific surface area and low thermal conductivity, and can be applied in many fields such as fire retardation, sound insulation, gas adsorption and the like.

A novel fiber hydrophone sound-sensitive structure is characterized in that the sound-sensitive structure is made of a fiber coil and a polymeric material; the fiber coil is a cylindrical form coiling fiber, and embedded in the polymeric material; the sound-sensitive structure is a solid elastomer structure in an axisymmetric shape; the whole structure is formed by the fiber and the same polymeric material, is simple in structure, easy to make, and low in cost; on one hand, the problems that a conventional hollow sound-sensitive structure is poor in overpressure resistant performance can be solved; on the other hand, the fiber coiling structure is innovatively improved, the integral solid elastomer structure is combined, and the polyurethane embedding material with the smaller young modulus than a hard elastomeric material is employed, thus greatly improving the sound pressure sensitivity, and solving the contradictions between the interference type hydrophone sound-sensitive structure sound pressure sensitivity and overpressure resistant capability; the novel fiber hydrophone sound-sensitive structure is suitable for deep sea applications.

The invention relates to a biaxial optical gyroscope, which consists of a surface plasma excimer Y-type mode separator, a Y waveguide integrated optical device, a Y waveguide integrated optical chip, a first polarization-preserving fiber coil, a second polarization-preserving fiber coil, a directional coupler and a detector. The invention belongs to the technical field of integrated optics and inertial sensor, and provides the biaxial optical gyroscope. The biaxial optical gyroscope with a separation mode is realized by adopting waveguide devices made of different materials, and has the advantages of improvement on the utilization rate of light sources, high integrity and the like.

In a fiber-optic current sensor, a 22.5° Faraday rotator, which is part of the sensing fiber coil, determines the working point of the sensor. The coil is operated with substantially linearly polarized light or incoherent substantially left and right circularly polarized light waves. In one arrangement, a polarization beam splitter generates two optical signals that vary in anti-phase with changing current. A signal processor determines the current from the two anti-phase signals. Appropriately detuned and oriented fiber-optic half-wave or quarter-wave retarders before the fiber coil are used to reduce or cancel the adverse effects of temperature and bend-induced birefringence on the measurement signal. Moreover, the temperature may be derived from the difference in the bias of the anti-phase signals and may be used to cancel temperature effects in the signal processor.

The invention provides a moulding method for composite material irregular pipe fitting and a moulded pivot thereof. The support pivot made of the materials with low softening temperature and high melting point is arranged at the irregular position of a pipe, which is matched with the irregular position in shape. Macromolecule composite carbon fiber is coated on the support pivot so that the thickness of the support pivot reaches the required thickness of the shell of the pipe before the coated support pivot is arranged in a forming die; the support pivot is arranged in a blast pipe for heating and extrusion forming; after the pivot is cooled, the melted and deformed support pivot is taken out from the pipe, thus completing the forming process of the irregular pipe fitting. By adopting the support pivot, flexible macromolecule composite carbon fiber can be braided and preformed according to the shape, and the fiber grain direction when the macromolecule composite carbon fiber coils yarn is ensured. While hot air is fed to the blast pipe and the blast pipe is pressurized so that the macromolecule composite material is melted and shaped, the support pivot with low softening temperature and high melting point is melted and deformed; after the formed irregular pipe fitting is cooled, the support pivot is deformed and broken; subsequently, a tool is used for taking out the broken support pivot from the irregular pipe. The disposable support pivot brings convenience to moulding of irregular pipe fittings.

FPGA-based full-digital processing closed-loop fiber optic gyro is composed of an optical path part and a circuit part. The optical path part is composed of a broadband light source, a fiber optic coupler, a multifunctional integrated optical chip and a fiber optic coil. The circuit part is composed of an amplification filter circuit, A/D conversion, Composed of FPGA logic circuit, D/A converter, etc., the FPGA logic circuit completes the processing of digital signals, and the sum of the square wave modulation and digital ladder wave feedback signal generated by it is added to the multifunctional integrated optical chip after passing through the D/A converter. On one arm, the fiber coil is a single-mode fiber with lyot depolarizers added at one or both ends. Because the present invention adopts the addition of a lyot depolarizer on the basis of the single-mode fiber coil, the polarization evolution along the single-mode fiber will no longer affect the output of the gyroscope, which improves the zero-bias stability of the fiber-optic gyroscope, and then makes the gyroscope The accuracy is greatly improved; in addition, the modulation and demodulation method of the single-mode fiber coil with depolarizer is the same as that of the polarization-maintaining fiber, but its cost is only one tenth of the price of the polarization-maintaining fiber.

A high-precision optical gyroscope with 1.55 um wavelength for eliminating dead area, comprising a light path unit and a circuit unit; wherein the circuit unit comprises a laser, a laser driving circuit, a detector, a low pass filter, a analog-to-digital converter and a digital signal processing circuit; the light path unit comprises a spectral filter, an optoisolator, a first wavelength division multiplexer, an Er-doped fiber, a second wavelength division multiplexer, a reflector, a coupler, a Y-waveguide integrated optical device and a fiber coil; the spectral filter outputs superfluorescence with 1.55 um wave band; the light path unit further comprises a digital-analog converter and an amplifier; the digital-analog converter, amplifier and Y-waveguide integrated optical device are packed together by a metal box to form electromagnetic shielding. The invention interferes with the electron between driving signal of the Y-waveguide integrated optical device and the signal received by the detector on the structure to isolate, thereby eliminating the dead area caused by interference.

The invention relates to a crack monitoring sensor and use method thereof based on an OTDR (optical time domain reflectometry) technique, and belongs to the technical field of monitoring of optical fibers. The crack monitoring sensor comprises a protection box, a bare optical fiber coil, a first optical fiber with a protecting layer, and a second optical fiber with a protecting layer, wherein the bare optical fiber coil is provided with two end joints, the bare optical fiber coil is an optical fiber coil which is formed by winding and knotting a bare optical fiber, and the diameter of the bare optical fiber coil is 14mm to 16mm. When the crack monitoring sensor is used, firstly, the outer optical fiber of the sensor is welded with the first optical fiber with the protecting layer and the second optical fiber with the protecting layer through the end joints, secondly, the adhering function of epoxy resin adhesive is released by an adhesive release agent, so that the inner optical of the sensor is ensured to be freely stretched along with the extension of the crack, and then the concrete is cast. The crack monitoring sensor and the use method have the advantages that the construction is convenient, the manufacturing is simple, the cost is low, the crack monitoring sensor and the use method are suitable for monitoring the cracks of various types of concrete inner structures, meanwhile, the operability is high, and the real-time monitoring and the distributed monitoring on the concrete inner structures are realized.

The invention provides an optical module with a fiber winding mechanism. The fiber winding mechanism is simple in structure and extremely simple and convenient to operate so that the fiber coiling process becomes simple and feasible, high subsequent reliability can also be ensured and the internal space occupation of the optical module is greatly reduced. The optical module comprises an upper heatdissipation shell and a lower heat dissipation shell which can be spliced into a whole and a PCB which is arranged in the upper heat dissipation shell and the lower heat dissipation shell. A controlchip is arranged on the PCB, a laser device is connected on the PCB, and an optical device is arranged on the front side of the laser. The optical device is connected with an optical fiber, the otherend of the optical fiber is connected with an optical head, the laser and the optical device are respectively arranged on a TEC refrigerator, the TEC refrigerator is installed in a metal heat sink, and an optical fiber adhesion device is correspondingly arranged on the PCB and located on the rear side of the optical device and used for fixing the coiled optical fiber.

The invention relates to a high-efficiency winding method for inhibiting temperature error of fiber gyro coil. According to the invention, fiber is divided into a segment A and a segment B from a central point, the segment A and the segment B are respectively wound on two fiber supplying wheels, the middle point of the fiber is fixed on a connection part of the wheel shaft used for winding a frame and a wheel rim, the fiber A is vertically wound on a first layer of a fiber ring along the wheel shaft, the fiber B is vertically wound on a second layer of the fiber ring along the wheel shaft, then the fiber B is rewound to form a third layer, then the fiber A is rewound to form a fourth layer, according to an outer to inner mode, four layers alternatively wind the all fibers, and a quadrupolar symmetrical winding structure is completed. Based on symmetrical winding, a concept of the outer to inner symmetrical winding mode is introduced, the concept and a traditional symmetrical winding method are combined, and the outer to inner symmetrical winding mode is formed, the method can be used for any traditional symmetrical winding mode, the temperature characteristic of the fiber coil is greatly increased, such as the outer to inner quadrupolar winding mode, the outer to inner octupole-winding mode and the outer to inner hexadecapole winding mode.

The invention provides an optical fiber fusion and distribution integrated unit disc, and belongs to an optical fiber fusion and distribution part. The optical fiber fusion and distribution integrated unit disc comprises a cover plate and a unit disc body. The unit disc body comprises a fusion part in the upper layer and a tail fiber coiling part in the lower layer. A plurality of fiber winding-unwinding structures used for coiling tail fibers are arranged in the tail fiber coiling part, each fiber winding-unwinding structure is formed by detachably connecting a plurality of fiber winding-unwinding discs, and the fiber winding-unwinding discs of each fiber winding-unwinding structure are stacked in the vertical direction. The optical fiber fusion and distribution integrated unit disc can be used as a distribution unit disc in an optical cable splice box, and in the optical cable splice box, the tail fibers can be directly connected with an adapter of a standard main unit disc through the tail fibers. Attenuation in the whole light path process is effectively reduced, the network quality is improved, and obstacle points caused by connecting the optical fibers with the adapter are reduced. In addition, the tail fibers in the optical fiber splice box can be orderly and tidily arranged, and disordering of the tail fibers can be avoided.

The invention relates to a rapid connection apparatus of a photoelectric composite cable of a fiber-optic hydrophone array. The rapid connection apparatus comprises an upper sealing cylinder, a lower sealing cylinder, a fastening screw ring, sealing O-shaped rings, two composite cable sealing nuts, two sealing washers, two sets of composite cable clamping assemblies, two fiber coiling boxes, a copper conductor electrical connector assembly, and composite cables. The fiber coiling boxes are respectively installed in the upper sealing cylinder and the lower sealing cylinder; and the upper sealing cylinder and the lower sealing cylinder are connected into a sealing cylinder by the fastening screw ring and the two sealing O-shaped rings and the copper conductor electrical connector assembly is installed in the sealing cylinder. The composite cables in the upper sealing cylinder and the lower sealing cylinder are fixed by the composite cable clamping assemblies and are connected with the copper conductor electrical connector assembly. The end portions of the upper sealing cylinder and the lower sealing cylinder enable the composite cables and the sealing cylinder to be sealed and fixed by the composite cable sealing nuts and the sealing washers. The apparatus has advantages of small size, good quick and convenient properties, high confined water tightness, and good photoelectric composite connection and the like and is absolutely necessary for marine resource exploration and underwater target detection array.