8 results about "Pulse energy density" patented technology

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 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.