14 results about "Pulse energy density" patented technology

The invention discloses a roundness detection device and method for a finished aluminum alloy pipe, and relates to the technical field of pipe detection, and the method comprises the steps: constructing a multi-mode sensing array, calibrating and mapping the array to the axis of the pipe, triggering a constant-speed sliding table, and synchronously collecting a section point cloud and a vibration signal, an attractor feature matrix is generated based on phase-space reconstruction and a coding dictionary, a weighted directed graph is constructed to extract pulse energy distribution so as to accurately position a deviation node, a judgment threshold is adaptively corrected in combination with an energy gradient and connectivity change, and enhancement precision, rapid detection and a steady state tracking mode are dynamically switched. Model parameters are continuously optimized by comparing measured values of the high-precision roundness measuring instrument on line, a quality report containing deviation distribution, grade statistics and unique tracing identification is finally generated, and batch tracing and remote query are supported. Through combination of phase-space reconstruction attractor coding, pulse energy density analysis and dynamic mode switching, efficient identification of tiny deviation, precise positioning and balance between precision and efficiency are realized.

The invention provides an RB-SiC polished surface pressure stress strengthening device and an implementation method thereof, and the method comprises the following steps: a femtosecond laser generates an ultrashort pulse laser beam, and the ultrashort pulse laser beam passes through an optical shutter, a beam expander, a laser power attenuator, a reflector, a scanning galvanometer and an F-theta mirror and is finally focused on the surface of an RB-SiC sample. The RB-SiC sample is fixed on an XY displacement platform, the XY displacement platform and a Z axis are adjusted, and laser is focused on the to-be-irradiated surface of the RB-SiC sample; introducing high-pressure and high-speed nitrogen to protect the surface of the sample; a laser scanning path, a scanning speed and scanning times are designed, laser pulse frequency and average power of light emitted by a femtosecond laser and an attenuation coefficient of a laser power attenuator are set, so that laser single pulse energy density is slightly lower than an ablation threshold value of the sample under laser and scanning parameter setting, and finally, laser irradiation on the surface of the RB-SiC sample is started. Pressure stress strengthening can be achieved on the RB-SiC polished surface after sub-ablation threshold femtosecond laser irradiation, and the fatigue strength of a workpiece made of the RB-SiC material can be improved.

This disclosure provides systems, methods, and apparatus related to broadband emitters. In one aspect, a method includes providing a material. A pulse fluence, a wavelength, a repetition rate, and a pulse duration of a laser pulse are specified, and a number of laser pulses are specified. The material is exposed to the specified number of laser pulses at the pulse fluence, the wavelength, the repetition rate, and the pulse duration. The material is translated and the exposing operation is repeated to form an x-y array of exposed areas on the material. Each exposed area is about 25 microns to 35 microns from each other exposed area.

The invention relates to the technical field of semiconductor radiation detection, in particular to a structure and a preparation method of a CsPbBr3 single crystal based gamma ray energy spectrum detector. The structure of the CsPbBr3 single crystal-based gamma ray energy spectrum detector sequentially comprises a first metal electrode layer, a first PbO layer, a CsPbBr3 single crystal layer, a second PbO layer and a second metal electrode layer from top to bottom. The PbO layer is obtained by irradiating the surface of a single crystal with high-pulse energy density ultraviolet laser; the first metal electrode layer and the second metal electrode layer are deposited on the outer side of the PbO layer through vacuum thermal evaporation. Due to the existence of the PbO layer on the surface of the CsPbBr3 single crystal, the surface state of the surface of the single crystal can be weakened, so that the non-radiative recombination of photon-generated carriers is reduced; due to the existence of PbO, the work function of the surface of the CsPbBr3 single crystal can be increased, so that a Schottky barrier formed with an indium electrode is improved, and the energy spectrum resolution of the device to gamma rays is improved.

The embodiment of the invention provides a multi-dimensional data processing method and system for emergency data quality control analysis. The method comprises the following steps: acquiring photoacoustic blood flow imaging data and emergency treatment parameters of a patient, and generating multi-channel time-space associated data; constructing a laser pulse energy density correction module, generating an ultrasonic receiver sensitivity adjustment parameter through a dynamic coupling mechanism of the pain index grade and the capillary density distribution, and synchronously establishing a phase synchronous compensation network of the laser pulse repetition frequency and the heart rate variability; generating a real-time three-dimensional photoacoustic blood flow dynamic image, and dividing a difference region into a high-perfusion core region, a transition region and a low-perfusion marginal region based on blood flow velocity gradient mutation point spatial distribution; and generating an emergency treatment quality control score based on the dynamic correlation function, the mapping relation and the coupling coefficient. According to the technical scheme provided by the embodiment of the invention, real-time three-dimensional blood flow visualization and accurate partition diagnosis of mammary gland lesions are realized, and the pathological relevance of emergency treatment quality control scores is remarkably improved.

This invention relates to the field of medical technology, specifically to a portable low-energy extracorporeal shock wave lithotripsy system; comprising: a portable main unit module, a low-energy shock wave module, a miniature ultrasound positioning module, an AI intelligent control module, and a respiratory compensation module. This invention constructs a dual-focal constructive interference acoustic field and energy optimization model of a piezoelectric ceramic array. Within a safe range where the single pulse energy density is reduced, it effectively pulverizes stones using the shear stress generated by the sound pressure gradient between the two focal points, thereby significantly reducing the system's hardware dependence on power reserves and high-power heat dissipation, achieving a transformation from a single-pulse system to a trolley-type portable structure. Simultaneously, the system overcomes the off-target problem caused by dynamic respiratory displacement by using ultrasound image coordinate matrix mapping and an electro-mechanical dual-mode collaborative compensation mechanism, with microsecond-level instantaneous deflection of the electronic focal domain of the phased array to offset the mechanical response lag of the servo motor through phased array microsecond-level electronic focal domain instantaneous deflection.

The invention discloses a thermoelectric material / metal interface performance optimization method based on ultrafast laser. The method comprises the following steps: pretreating a bismuth telluride-based thermoelectric material; ultrafast laser surface irradiation treatment is conducted on the pretreated bismuth telluride-based thermoelectric material, the pulse width of ultrafast laser ranges from 200 fs to 500 ps, the center wavelength of the laser ranges from 343 nm to 1064 nm, the single pulse energy density (F) ranges from 200 mJ cm <-2 > to 1200 mJ cm <-2 >, and the light spot overlapping rate (EL = 10%-90%); and cleaning and drying the obtained bismuth telluride-based thermoelectric material, and then forming a metal electrode layer on the surface subjected to ultrafast laser irradiation treatment to obtain the thermoelectric material / metal interface material. The method can strengthen the electrical property and the mechanical property of the gold-half interface.

The utility model discloses a pulse light source driving circuit and equipment, and relates to the technical field of beauty equipment. The pulse light source driving circuit comprises a power supply input end, a light source circuit, N charging and discharging circuits and a main control circuit. The input ends of the N charging and discharging circuits are connected with the input end of the power supply, and the output ends of the N charging and discharging circuits are connected with the input end of the light source circuit. N signal input ends of the main control circuit are respectively connected with detection ends of the N charging and discharging circuits, and N signal output ends of the main control circuit are respectively connected with controlled ends of the N charging and discharging circuits. Therefore, the main control circuit can respectively control the charging and discharging states of the N charging and discharging circuits according to the voltages of the N charging and discharging circuits so as to provide the pulse current required by the work of the light source circuit, and the pulse interval can be shortened, the pulse width can be prolonged, and the pulse energy density can be improved.

The application discloses a roundness detection device and method for finished aluminum alloy pipes, and relates to the technical field of pipe detection. The method comprises the following steps: constructing a multi-modal perception array and calibrating mapping to the pipe axis, triggering synchronous acquisition of cross-section point cloud and vibration signals by a constant-speed sliding table, generating an attractor feature matrix based on phase space reconstruction and coding dictionary, constructing a weighted directed graph to extract pulse energy distribution for accurate positioning of deviation nodes, combining energy gradient and connectivity change to adaptively correct the decision threshold and dynamically switch the enhanced precision, fast detection and steady tracking modes, continuously optimizing model parameters by online comparison with actual measurement values of a high-precision roundness gauge, and finally generating a quality report containing deviation distribution, grade statistics and unique traceability identification to support batch traceability and remote query. Through the combination of phase space reconstruction attractor coding, pulse energy density analysis and dynamic mode switching, efficient identification, accurate positioning and balance between precision and efficiency of slight deviations are realized.

The invention discloses an output energy control method and system for an intense pulsed light therapeutic apparatus, and particularly relates to the technical field of medical beauty equipment, and the method comprises the steps: building a tissue optical characteristic baseline through multi-wavelength detection light, and carrying out the personalized setting of initial parameters; dynamic changes of tissue optical characteristics are monitored in real time in treatment, and thermal relaxation time is adaptively adjusted based on preorder pulse energy and a temperature change rate; energy adjustment factors are calculated according to optical parameter changes, and pulse energy density, interval and waveform parameters are intelligently optimized; a pulse sequence cooperative control model is established, and multiple safety protection is realized through thermal damage probability integration and spectral feature monitoring. The technical problems that traditional equipment is unstable in energy output, depends on artificial experience and lacks real-time dynamic adjustment capacity are solved, precise and personalized energy control is achieved, and treatment safety and effectiveness are remarkably improved.

The invention relates to the technical field of biomedical materials, and particularly discloses a laser surface treatment method and application of a magnesium alloy wire. The invention discloses a laser surface treatment method of a magnesium alloy wire. The surface of the magnesium alloy wire is treated by adopting a laser surface treatment technology with the following process parameters: the scanning speed is 5-15 mm / s, the wavelength is 1050-1080 nm, the pulse width is 1 * 10 <-9 >-3 * 10 <-9 > s, the power is 5-8 W, the frequency is 18000-22,000 Hz, the light spot size is 1 / e2, the diameter is 150-175 microns, and the pulse energy density is 2.0-3.0 J / cm < 2 >. According to the scheme, in-situ tissue reconstruction is carried out through a laser surface treatment method, so that the corrosion resistance of the magnesium alloy is greatly enhanced, the reliability of the magnesium alloy wire in a cardiovascular implant is improved, the service life of the magnesium alloy wire in the cardiovascular implant is prolonged, meanwhile, the green manufacturing requirement is met, and the defects of a traditional method in the degradation control aspect are overcome.

This invention provides a method for the flexible fabrication of multi-morphological three-dimensional metal microcone structures induced by femtosecond lasers, comprising the following steps: Step 1: fabricating a metal film layer; Step 2: setting the single-pulse energy of the femtosecond laser beam according to the morphology and size of the target multi-morphological three-dimensional microcone structure, and pre-setting the target spot morphology and spatial energy distribution of the focused processing beam; Step 3: activating the femtosecond laser source, the femtosecond laser beam being shaped by a beam modulation and focusing module, and focusing on irradiating the upper surface of the metal film layer to induce the generation of the target multi-morphological three-dimensional microcone structure; wherein, the laser single-pulse energy density is lower than the metal film layer ablation threshold. This invention uses single-pulse energy and spot morphology as control means, the single-pulse energy determines the height and overall size of the microcone, and the spot energy distribution determines the shape of the microcone. It achieves customized and controllable fabrication of various multi-morphological three-dimensional microcone structures on the metal film surface through direct writing, with high freedom of morphology control, adapting to the structural requirements of different functional devices.

The invention provides a cascade amplifier and a laser generation device, and the cascade amplifier comprises N stages of multi-optical-path amplification units which achieve the amplification of a to-be-amplified light beam based on a multi-optical-path pool and a gain medium; and the N-1-stage optical coupling unit is used for converting the light spot size of the light beam to be amplified amplified by the front-stage multi-optical-path amplification unit and coupling the light beam to be amplified to the rear-stage multi-optical-path amplification unit, and converting the light spot size of the pump light beam which is not absorbed by the rear-stage multi-optical-path amplification unit and coupling the light beam to the front-stage multi-optical-path amplification unit. According to the invention, a multi-stage amplification structure is adopted, pumping light beams are fully utilized, and high pulse energy and high pulse peak power can be realized; meanwhile, confocal of the multi-optical-path amplification unit is ensured based on the doping concentration and / or thickness of the gain medium sheet; the cross-section of the light beam at the location of the optical component is also increased such that the pulse peak power density and pulse energy density at the location of the optical component are maintained below a damage threshold, thereby protecting the optical component.

The application provides a wall damage inhibition method in ultrafast laser processing, aiming at the wall damage situation in the processing, and executing the subsequent steps; selecting a filling material as a typical sample, correcting the damage threshold and the material band gap width relationship formula, quickly generating a multi-pulse damage threshold table of all filling materials; using the multi-pulse damage threshold table, selecting a material with a multi-pulse damage threshold greater than the laser pulse energy density selected in the processing as the filling material in the processing; filling the selected filling material in the cavity of the to-be-processed sample, using the optimal processing parameters to complete the sample processing, pouring the filling material after finishing, checking the sample quality, if not satisfied, selecting other materials meeting the conditions as the filling material according to the requirements, if satisfied with the processing requirements, outputting the result for the formal workpiece manufacturing.