37 results about "All fiber" patented technology

This utility model discloses a new energy main station security access authentication device, including a security box. The security box has a partition inside, on which a station-side security access authentication device and a field-side security access authentication device are placed. A fixed crossbar is located on the front side of the partition, with rotatable covers rotatably connected to both the upper and lower sides of the fixed crossbar. The security box has corresponding latches with slots. A lock and a knob are located in the middle of the front side of the fixed crossbar. An anti-misoperation rod is rotatably connected to the lower side of the turntable, and the anti-misoperation rod is engaged with the rotating rod of the knob. This utility model protects the interface between the station-side and field-side security access authentication devices through the rotatable covers, allowing operation of the fiber optic connection only with a key, thus ensuring high security. The knob and plug design allow for quick disconnection of all fiber optic connections between the station-side and field-side security access authentication devices, making it suitable for emergency situations.

The application discloses a waterproof and breathable flexible resistance type pressure sensor based on a PA6 full-fiber network and a preparation method thereof, and belongs to the technical field of flexible pressure sensors.The application prepares a plurality of fiber structures based on PA6 through an electrostatic spinning technology and obtains a full-fiber resistance type pressure sensor.PA6 / PS fibers serve as the outermost layer to provide waterproof characteristics, PA6 / Au fibers serve as a flexible electrode layer, pure PA6 fibers serve as an isolation layer, and PA6 / PANI fibers serve as a sensitive layer.The introduction of the isolation layer significantly improves the linearity of the sensor, the linear detection range gradually increases with the increase of the thickness of the isolation layer, and the sensor has good repeatability and fast response recovery time.In addition, the sensor prepared by the application adopts a full-fiber structure and has good air permeability, so that sweat can be fully volatilized during long-time wearing;the outer layer of the sensor is encapsulated by hydrophobic fibers, and the sensor has good waterproof characteristics.

This invention relates to the field of furnace top construction technology, and more particularly to an auxiliary device for the construction of a full-fiber nano-insulation system for furnace tops. The device includes a long track approximately the same length as the channel steel of the furnace top, and four positioning mechanisms located at the four corners of the long track surface. The invention uses an electric cylinder to lower a lifting seat, causing the rollers at the bottom of the fixed frame to contact the material surface. The lifting seat then continues to descend slightly, allowing the movable column to move vertically along the sliding holes. A compression spring continuously applies downward pressure, and a second motor drives a rotating rod to rotate via a transmission shaft, causing the eccentric wheel to vibrate at high frequencies. This structure solves the problem in the prior art where manual smoothing and compaction makes it difficult to ensure uniform filling, especially at the junction of brick piles and channel steel, and in irregularly shaped areas where gaps easily appear. It ensures that the nano-insulation material fully fills all complex corners, guaranteeing the overall bonding effect between the insulation layer and the furnace top structure.

This application relates to a method and apparatus for digital transformation of ODN facilities. The method includes: obtaining a character array of box names and a character array of port names based on an actual box image; identifying the box under maintenance and installing box tags and fiber optic cable segment tags directly connected to the box; obtaining a port status array based on a box image after all fiber optic cable segment tags have been installed; locating and identifying each installed fiber optic cable segment tag, and obtaining a port name-bound tag object array based on the located and identified box image, port name character array, and port status array; constructing a meter-length pairing structure object array between box ports based on the meter-scale image of the fiber optic cable segment; and constructing a tag pairing relationship between box ports based on the box topology connection table, the meter-length pairing structure object array between box ports, and the port name-bound tag object array. This application allows a single person to quickly assemble tags for boxes or fiber optic cable segments and complete the digital transformation, with high efficiency and low construction difficulty.

The invention belongs to the technical field of flexible electronics, and particularly relates to a low-impedance polyimide-based all-fiber structure flexible pressure sensor and a preparation method thereof. The low-impedance polyimide-based all-fiber structure flexible pressure sensor comprises electrode fiber layers and a dielectric fiber layer, the electrode fiber layers are arranged on the upper surface and the lower surface of the dielectric fiber layer respectively, and the electrode fiber layers and the dielectric fiber layer form gradient dielectric filler distribution; and the electrode fiber layer and the dielectric fiber layer are laminated fibers prepared by mixing a polyimide material, a dielectric filler and a spinning aid and then carrying out airflow spinning. The three-layer structure and the gradient dielectric filler content design are adopted, the excellent sensing performance can still be kept in the temperature range of-70 DEG C to 200 DEG C, and high response consistency is kept in high and low temperature environments.

A multi-beam system includes a light source configured to emit light; a fiber bundle connected to the light source; and a camera configured to capture an image set including images corresponding to each fiber connected to the light source. The fiber bundle includes a central fiber having one end connected to the light source, and N layers of fibers surrounding the central fiber. The first layer of fibers includes M fibers, each having one end connected to the light source, and the Nth layer of fibers includes more than M fibers, but only M fibers in the Nth layer of fibers have one end connected the light source. A processor is configured to determine a centroid of each image in the image set to produce a centroid map and generate a fiber location map comprising fiber locations of all fibers in the fiber bundle based on the centroid map.

The invention provides a discontinuous fiber reinforced composite material unit cell model rapid establishment method, and belongs to the technical field of composite material multi-scale computational mechanics. The problem that a coordinate transformation and fiber modeling method capable of accurately describing the fiber bending form and any three-dimensional orientation is lacked is solved. The method comprises the steps that the overall size, fiber distribution parameters and discrete unit size of a unit cell model are defined; generating specific distribution parameters of all fibers; discretizing the fibers according to the length of the fibers and the size of the discrete unit, and performing coordinate transformation and local bending rotation; segmenting and periodically translating the intersection point of each fiber and the periodic grid; writing the unit and node information of each fiber into a text file; importing a CAE (Computer Aided Engineering) for visualization; a matrix part is established, a fiber phase and a matrix phase are integrated, and a unit cell numerical model is obtained by assembling and dispersing matrix parts and embedding fibers into a matrix. The method is used in the fields of aerospace and automobile manufacturing.

A construction method of a fiber lining surface of an ethylene cracking furnace includes the following steps: S1, leveling the fiber lining surface; S2, wetting the leveled fiber lining surface; S3, rooting the wetted fiber lining surface; and S4, coating, before the fiber lining surface is dried, high-temperature paint to the fiber lining surface that has been rooted; and reserving multiple expansion sews on the fiber lining surface during the coating process. According to the construction method of the high-temperature paint for full fiber lining structure of the ethylene cracking furnace, the high-temperature paint is firmly bonded with the lining, and will not crack or fall off during use, protecting the full fiber lining by the coating and greatly extending the service life of the lining.

This invention discloses a high-voltage DC fully controlled solid-state switch control device, relating to the field of power electronic control technology. The device includes: a control unit configured to output a trigger control signal via a single control pin; a drive circuit including a control switch Q1 and multiple fiber optic transmitters U1 physically connected in series; a transmission branch composed of multiple series-connected fiber optic transmitters U1, connected in parallel with the control switch Q1 in a power supply circuit to synchronously control the extinction or emission states of all fiber optic transmitters U1 in the transmission branch; wherein, when the control switch Q1 experiences a short-circuit failure, or any fiber optic transmitter U1 experiences an open-circuit failure, all fiber optic transmitters U1 in the transmission branch synchronously enter an extinction state, thereby synchronously turning off multiple high-voltage power switching devices. This invention aims to reduce the number of high-voltage power supplies and solve the problem of rapid synchronous control and protection under multi-transistor parallel connection.

The utility model discloses a full fibre trolley type resistance furnace belongs to resistance furnace field, including furnace body, closed subassembly and drive mechanism are arranged at the top of furnace body respectively, and drive mechanism is connected with closed subassembly, drive mechanism is used for providing power for closed subassembly, and closed subassembly is used for closing at the furnace mouth place of furnace body, closed subassembly includes two settings in the top of furnace body's stand, rotatable through the stand's rotary bar, two respectively cover set in the outer wall of rotary bar's guide pulley, cover in the outer wall of guide pulley's tow rope, the utility model discloses a full fibre trolley type resistance furnace, compared with prior art, and the full fibre trolley type resistance furnace of this full fibre trolley type resistance furnace sets up wheel speed sensor real -time monitoring door board moving speed, cooperates power mechanism, expansion piece and elastic buffer piece, can trigger buffer mechanism in time when door board is too fast and goes down, effectively avoided the security hidden danger and equipment damage problem that traditional resistance furnace brought because furnace door rapid falling.

The invention belongs to the technical field of functional flexible materials, and particularly relates to an all-fiber porous low-impedance sensor of gradient dielectric filler and a preparation method of the all-fiber porous low-impedance sensor. The all-fiber porous low-impedance sensor is of an integrated structure formed by stacking at least three layers of dielectric fibers in the thickness direction, and gradient dielectric filler distribution is formed by the adjacent dielectric fibers. The gradient dielectric filler full-fiber porous structure with the ultrahigh porosity (the porosity is larger than 80%) is adopted, and low-impedance variable dielectric response is achieved through the synergistic effect of fiber lap joint and impedance regulation and control.

This utility model relates to the field of fiber optic distribution technology, specifically disclosing a fiber optic distribution frame, including a housing, a front door of the housing, a movable support, and fiber optic distribution units. The movable support is placed inside the housing, and each fiber optic distribution unit is placed side by side inside the movable support. Fixed plates are provided on the left and right sides of the movable support. At least two rubber blocks are provided on the side of the fixed plates away from the movable support. A rotary push device for adjusting the friction between the rubber blocks and the housing is provided between the fixed plates and the rubber blocks. The fiber optic distribution units are integrated on the movable support inside the housing. When replacing the fiber optic distribution units, if the view is obstructed, the fixation between the movable support and the housing can be released, and the movable support can be pulled out entirely from the housing, exposing all fiber optic distribution units on the outside of the housing. This allows personnel to maintain the fiber optic distribution units in an open environment, avoiding misoperation or component damage due to space constraints.

A fiber rotator system includes a clamp assembly and a fiber rotator assembly for aligning multiple optical fibers. The clamp assembly has a base with fiber channels, fiber clamps, and a guide assembly. The fiber rotator assembly includes a linear actuator and wheel clamps, each aligning with a fiber base channel. Each fiber clamp includes a jaw, connecting rod, spring, and handle, while each wheel clamp includes a linear actuator contactor, wheel jaw, fiber channel rod, and wheel guide. A fiber detection and alignment system analyzes fiber end faces and provides alignment data to a fiber rotator controller. In operation, each wheel clamp contacts and rotates with the linear actuator. The fiber rotator controller selectively engages and disengages the fiber clamps and wheel clamps to iteratively rotate and secure fibers until all fibers are aligned. The system scalably automates alignment of multiple polarization maintaining (PM) fibers with high precision.

The invention relates to an optical cable polling detection device and system and an optical cable polling detection method. The optical cable polling detection device comprises a first detection unit which outputs detection light to carry out polling detection on all fiber cores in a group of fiber cores when no abnormity is detected; when an abnormality is detected, only the fiber core which detects an abnormal signal is detected; the second detection unit is used for outputting detection light to carry out polling detection on all fiber cores in the other group of fiber cores when the abnormity is not detected; when the abnormal signal is detected, only the fiber core in which the abnormal signal is detected is detected; the first detection unit is respectively connected with all the core fibers through the optical change-over switches, and the second detection unit is respectively connected with all the core fibers through the optical change-over switches; and the control part is connected with the first detection unit and the second detection unit for control, and the control part is respectively connected with the light change-over switch and controls the on-off of the light change-over switch.

The application discloses a kind of microseismic positioning methods based on fiber grating acoustic emission sensing technology, comprising: (a) at least four monitoring points are selected in the underground mine to be measured, and a fiber grating acoustic emission sensor is arranged at each monitoring point, and four fiber gratings are equidistantly arranged on the fiber grating acoustic emission sensor;(b) the propagation velocity of acoustic emission signals on the path from all fiber grating acoustic emission sensors to the source is solved;(c) the coordinate data of each fiber grating acoustic emission sensor and the time data of receiving acoustic emission signals are processed to obtain corresponding data on the corresponding monitoring point;(d) the propagation velocity obtained by calculation, the coordinate data of monitoring point and the time data of receiving acoustic emission signals are substituted into the source calculation equation set to obtain the coordinates of the source.The application can accurately locate the source in the underground mine, can provide reliable technical guidance for taking targeted reinforcement and other measures, and ensure the safe production and mining of underground mine.

The application discloses a kind of astronaut special-shaped member arbitrary toughening phase intelligent modeling method, belong to the intersection technical field of computer graphics of calculation simulation;The application is first input to obtain point cloud data set with the face node coordinates in complex special-shaped member, decomposition obtains mid-plane centroid and three partial vectors, project point cloud to local plane and calculate its range and center;Scale curve and rotate translation to the local plane center, after 3D plane mapping, nearest neighbor algorithm projection mapping to point cloud, equal arc length sampling obtains multiple control points;Based on control point file generates multiple fiber objects, by calculating the shortest distance of model node and fiber axis and cross section level set value, identify fiber unit, boundary unit and matrix unit;Boundary unit is again segmented and re-identified unit, after all fiber object determination is completed in cycle, traverse fiber unit and calculate its axial tangent vector, complete modeling;The application can quickly realize the digitization modeling of high-end complex toughening component.

The invention relates to a simulation model parameter determination method and system for a composite material. The method comprises the following steps: determining at least two fiber arrangement directions on the basis of layering structure parameters of a composite material, and obtaining test curve data of samples corresponding to all the fiber arrangement directions under three test types; determining test material parameters of the composite material based on the test curve data, constructing a simulation model based on the layering structure parameters, the structure parameters of all the samples and the test material parameters, and determining simulation curve data of the simulation model under various test types; determining a test simulation error based on the test curve data, the simulation curve data and a preset objective function, and updating the test material parameter based on the test simulation error to obtain a simulation model parameter corresponding to the minimum test simulation error, the prediction capability, the reliability and the parameter calibration efficiency of the simulation model on the real mechanical behavior of the material are remarkably improved, and the influence on the safety evaluation result of the whole vehicle can be avoided.

The application discloses a vertical bright annealing furnace with full-fiber structure and relates to the technical field of vertical bright annealing furnaces.The vertical bright annealing furnace comprises a base, an input channel, a furnace body, a polycrystalline alumina fiber layer, a cooling section, an output roller shaft support, stainless steel strips, an air inlet pump, an atmosphere pipe, a circulating assembly, a leveling assembly, a supporting assembly and a pretreatment assembly.The application can continuously change the conduction force of the abutting ring sleeve to the fixed shaft when the electric push rod drives the moving rod to reciprocate, so that the conduction force of the middle part of the abutting ring sleeve to the fixed shaft is prevented from being in the same position for a long time to cause deformation damage to the fixed shaft, and meanwhile, the jet pipe can continuously spray dry high-temperature gas on the surface of the stainless steel strips when the electric push rod works, so that the surface water of the stainless steel strips can be effectively removed, and the surface dust and impurities can be carried away.

The application discloses a kind of ceramic matrix composite ultrasonic milling amplitude parameter determination method, belongs to composite material processing technical field, it is characterized in that, including the following steps: a, according to the fracture mode of fiber in macroscopic brittle fracture domain, fiber orientation angle is divided into three intervals;B, three fiber orientation angle intervals are proposed micro-macro brittle fracture transition critical criterion;C, the critical depth of three fiber orientation angle intervals is calculated respectively by selecting corresponding critical depth model;D, according to the critical depth of all fiber orientation angles, select minimum value as the amplitude value of ceramic matrix composite ultrasonic vibration assisted face milling.The minimum value of the calculated all fiber orientation angle micro-macro brittle fracture transition critical depth is used as the amplitude value of ceramic matrix composite ultrasonic vibration assisted face milling, and is used for ceramic matrix composite ultrasonic vibration assisted processing, which greatly reduces the machined surface roughness of ceramic matrix composite.

A method and system for transmitting an optical signal. One or more first and second multi-core optical components are coupled to all of the fiber cores in the multi-core fiber. Erbium-doped fiber amplifier (EDFA) optics are coupled to all fiber cores in the multi-core fiber and include a plurality of EDFAs. Each optical fiber core is coupled to the EDFA. The EDFA optical component is coupled to all optical fiber cores between the first and second multi-core optical components. The first multi-core component is coupled at an input of a first portion of the fiber core and provides a first function, and coupled at an output from a second portion of the fiber core and provides a second function. A second multi-core component is coupled from the output of the first portion of the fiber core and provides a second function, and coupled to the input of the second portion of the fiber core and provides the first function.

This invention discloses a method for constructing a ductile concrete bridging force model considering the randomness of fiber pull-out, belonging to the field of model construction technology. The method involves modeling and calculating the number of fibers in a cross-section; randomly assigning embedment depth and angle to each fiber; obtaining random distribution parameters of characteristic values ​​for each fiber; generating a simplified pull-out curve model for each fiber; establishing a fiber truncation algorithm; superimposing the pull-out curves of single fibers to establish a fiber bridging force model with randomness in single fiber pull-out; and applying the bridging force model. This construction method introduces randomness into single fiber pull-out, calculates the number of fibers in the cross-section and the fiber breakage rate to fit the pull-out curve of a single fiber, and sequentially superimposes the pull-out curves of all fibers on the cross-section according to the minimum step size of data acquisition, establishing a random bridging force model based on a three-segment line of single fiber pull-out. The analysis results show strong consistency with experimental data, making it suitable for guiding the design and optimization of the macroscopic properties of composite materials.

The invention discloses a holocellulose bulk based on a fiber three-dimensional entangled network and a preparation method thereof. The material is composed of natural plant fibers, adjacent fibers are entangled and hooked by regulating and controlling the fiber structure, and a stable network porous structure is formed in the three-dimensional space direction. The preparation method comprises the following steps: firstly, pretreating plant cellulose fibers by using a chemical solution to form uniform pasty slurry, pouring the uniform pasty slurry into a mold for preliminary molding, then introducing a fiber entangled and hooked structure by using the chemical solution, drying, and cleaning with water to remove residual chemical substances; and finally drying to obtain the holocellulose block with the characteristics of stable structure, compression recovery and the like. The holocellulose block prepared by the method has the characteristics of wet stability, dry toughness, compression recovery and the like, has the characteristics of wide raw material sources, simple preparation process, easiness in recovery of chemical solvents, low cost and the like, and has a wide application prospect in the field of sustainable functional materials.

The application belongs to the technical field of laser equipment, and particularly relates to a high-power 976nm single-mode all-fiber laser. The technology comprises a shell, the left end of the shell is provided with an end cover, a pump source is arranged in the shell, a water-cooling plate is fixed in the shell, an installation groove which can accommodate the bottom of the pump source and is arranged in an inclined manner is formed in the water-cooling plate, a hole for connecting the installation grooves is formed in the groove wall of the installation groove, and a water-cooling assembly is arranged in the water-cooling plate. A forced air cooling mechanism is arranged on one side of the water-cooling plate, a fiber power combiner is arranged in the shell, and an output port is arranged on the shell. The bottom of the pump source is arranged in the inclined installation groove, the contact area between the pump source and the water-cooling plate is increased, the cooling effect is good, the hole in the groove wall of the installation groove is used for connecting the installation grooves, when silicone grease is applied, the excess silicone grease can flow into other installation grooves, the processing time is reduced when too much silicone grease is applied, the heat conductivity is increased by the through hole and the silicone grease in the through hole, and the heat dissipation effect is enhanced.

A novel detection scheme and all fiber optic temperature sensor is disclosed. The apparatus comprising a sensing loop; a laser diode driver; a coupler; a first photodetector coupled to the coupler output to produce a current; an amplifier to convert and amplify the current to voltage; an A / D converter to convert the voltage to digital signal; an AOEO regenerator to convert coupler optical output to electronic signal while preserving timing information and electronic signal to regenerated optical signal; a timer to control AOEO delay time; optical fiber probe; and microcontroller coupled to laser diode driver, A / D converter, and timer; and configured to control first optical signal timing and AOEO delay time; and configured to process digital signal based on its time of flight variation to determine a temperature change, and wherein sensitivity increases with increasing optical fiber length and / or number of regenerated optical signals. Other embodiments are described and claimed.

The invention relates to the technical field of multidirectional die forging, in particular to a multidirectional die forging forming process and method for an all-fiber piston rod of an aircraft landing gear. The invention discloses a multi-directional die forging forming process and method for an all-fiber piston rod of an aircraft landing gear. The multi-directional die forging forming process is characterized by comprising the specific steps of raw material detection, wherein size and performance detection is conducted on raw materials meeting purchasing requirements and specifications; preparing a blank: preparing the raw materials into the blank according to requirements; blank heating is conducted, specifically, the blank is heated; all-fiber multi-directional die forging is conducted, specifically, the heated blank is placed on a special press, die forging forming is conducted on the piston rod forging rod through a special die, and the drawing size is achieved; punching is conducted, specifically, the forge piece is subjected to punching treatment through a multi-directional die forging technology; and heat treatment after forging: heat treatment is performed according to heat treatment specifications to meet the technical requirements of drawings. Compared with the prior art, the multi-directional die forging forming process and method for the all-fiber piston rod of the aircraft landing gear break through barriers in the prior art, and manufacturing of the all-fiber hollow piston rod is achieved.

The invention is a nonwoven fabric characterized by satisfying 0.25≤(L2 / V)≤10, when an average fiber diameter of all fibers is L (μm) and a volume per m2 is V (cm3). The nonwoven fabric leads to a solid electrolyte-carrying sheet in which solid electrolyte particles are carried between fibers and which can achieve a good balance among thickness reduction, powder falling property of the solid electrolyte particles, and electrical conductivity.

The utility model relates to the field of power generation, and discloses an all-fiber fabric generator, a functional textile and intelligent wearing clothes. The all-fiber fabric generator comprises at least two friction layers and at least one group of conductive fibers, the conductive fibers are single fibers, and the conductive fibers are connected with the at least one friction layer to collect charges generated by mutual friction between the friction layers. The all-fiber generator can efficiently collect mechanical energy on the premise of not sacrificing the wearing comfort of clothes, and has multiple functions of purifying air, inhibiting bacteria and the like. The functional textile can be applied to various industries, such as fire fighting, extreme outdoor and the like; the all-fiber fabric generator can provide a micro power supply for intelligent equipment.

The application discloses a full-fiber color-changing one-way wet-conducting triboelectric fabric and a preparation method and application thereof, and belongs to the technical field of electrospun elastic fiber materials. The full-fiber one-way wet-conducting triboelectric fabric is composed of electrospun thermoplastic polyurethane / polyvinylidene fluoride-hexafluoropropylene nanofiber membranes (TPU / PVDF-HFP) as a hydrophobic layer, electrospun thermoplastic polyurethane / polyvinylidene fluoride-hexafluoropropylene / poloxamer F127 nanofiber membranes (TPU / PVDF-HFP / F127) as a super-hydrophilic layer, and liquid metal conductive paint (LM-Ag NPs) coated on the surface of the super-hydrophilic layer, so that the full-fiber one-way wet-conducting triboelectric fabric has the characteristics of rapid moisture absorption and sweat release, excellent mechanical properties and good conductivity. In addition, thermochromic microcapsules are added to the spinning solution of one or both of the hydrophobic layer and the super-hydrophilic layer to form a full-fiber color-changing one-way wet-conducting triboelectric fabric, so that the full-fiber color-changing one-way wet-conducting triboelectric fabric has temperature response and warning functions.

The invention belongs to the technical field of electronic materials and devices, and discloses an all-fiber structure vertical organic electrochemical transistor and a preparation method thereof.The all-fiber structure vertical organic electrochemical transistor is composed of a lower electrode layer, a semiconductor active layer and an upper electrode layer, and the upper electrode layer and the lower electrode layer are ion permeable electrode layers; the porous PAN / PVP nanofiber membrane is composed of a porous PAN / PVP nanofiber substrate and a metal conductive layer, the semiconductor active layer is an electrospun PEDOT: PSS / PAm nanofiber membrane treated by DMSO (dimethylsulfoxide); the preparation method comprises the following steps: firstly, respectively preparing the ion permeable electrode layer and the semiconductor active layer, and then assembling the upper electrode layer, the semiconductor active layer and the lower electrode layer into the all-fiber structure vertical organic electrochemical transistor. The vertical organic electrochemical transistor with the all-fiber structure is more compact in structure, higher in channel utilization rate and shorter in ion transport path, and the signal amplification performance and the time response performance of a device are greatly improved.

An active and passive Q-switched Yb < 3 + >-doped pulse fiber laser of a semiconductor laser pump comprises an FBG (fiber bragg grating), an acousto-optic Q switch with a tail fiber, a single-mode fiber, a fiber coupler and a gain fiber which are sequentially connected, a pump light input end of the fiber coupler is provided with an LD (laser diode) pump light source, and the tail end of the gain fiber serves as an output end of the whole pulse laser. The output end of the pulse laser serves as an output reflector of the resonant cavity and forms the resonant cavity of the laser with the FBG. According to the utility model, an all-fiber mode is realized, the coupling efficiency of each connection point is improved, the whole pulse laser is concise, the sensitivity of an optical path to alignment errors is greatly reduced, and the imbalance sensitivity of a system is relatively low. Especially on the Q-switching technology, active and passive Q-switching mechanisms are used, active Q-switching has the function of stabilizing pulses, passive Q-switching based on the SBS effect can narrow the pulse width, and therefore stable pulse output with stable repetition frequency and narrow pulse width is obtained.