47results about How to "High pulse frequency" patented technology

The invention provides a pulse laser radar for large scale mapping and a method of the pulse laser radar. N sets of laser emitting units and echo detecting units are arranged on a laser head of the pulse laser radar, N>=2, and the N sets of laser emitting units and echo detecting units are distributed along the outer diameter of the laser head with a 2pi / N central angle with a rotary shaft as a center. Each laser emitting unit comprises a laser and an emitting optical system, each echo detecting unit comprises a detector and a receiving optical system, and according to the distance between the emitting optical systems and the receiving optical systems, the echo energy receiving rate ranges from 10 percent to 75 percent when the detecting distance ranges from 2 m to 15 m. High scanning frequency can be achieved, and the distance detecting dynamic range can be improved.

An ophthalmic laser device with a treatment beam path that includes a variably adjustable modulator. The ophthalmic laser device is adapted to determine for the radiation pulses to be inputted into the tissue a power density to be inputted into the relevant target volume through the treatment beam path depending on a spatial distance between two target volumes of immediately successive radiation pulses and to adjust the modulator parallel in time with the control of the deflecting unit such that the relevant pulse in the target volume has the determined power density.

For processing eye tissue (8) by means of femtosecond laser pulses, an ophthalmological device (1) includes a projection optical unit (2) for the focused projection of the femtosecond laser pulses into the eye tissue (8). Disposed upstream of the projection optical unit (2) is a first beam-deflecting scanner system (3) for scanning the eye tissue (8) with the femtosecond laser pulses along a processing line. A second beam-deflecting scanner system (5) is disposed upstream of the first scanner system (3) and is designed for scanning the eye tissue (8) with the femtosecond laser pulses in a scanning movement superimposed on the processing line and running in a deflection plane. The second scanner system (5) has a scanner speed that is a multiple of the scanning speed of the first scanner system (3). A rotation system is provided for aligning the deflection plane with a defined angle with respect to the processing line.

The invention relates to a programmable nanosecond double-pulse integrated power supply which comprises a voltage regulating and rectification circuit and a chopper circuit, wherein the input end of the voltage regulating and rectification circuit is connected with industrial frequency alternating current, the output end of the voltage regulating and rectification circuit is connected with the input end of the chopper circuit and the output end of the chopper circuit is the output end of the power supply; the output end of the chopper circuit is respectively connected with a tool electrode and a processing workpiece; the chopper circuit is connected with a high-frequency control circuit which outputs a control signal to control the output of the chopper circuit so as to control the current direction in the tool electrode and the processing workpiece, and positive and negative pulses as required can be obtained between the tool electrode and the workpiece; the high-frequency control circuit comprises a high-frequency logic control circuit and an amplifying circuit, wherein the high-frequency logic control circuit outputs a high-frequency logic control signal which is amplified by the amplifying circuit to obtain a control signal for controlling the chopper circuit. Compared with prior art, the programmable nanosecond double-pulse integrated power supply of the invention has the advantages of wide pulse-width adjustable range, narrow minimum pulse width and high pulse frequency, is convenient to be set with parameters and easy to access to a micro electrochemical machining computer numerical control system and can realize the online real-time adjustment of power supply parameters.

The invention relates to a multiplex pulse laser integrated system, in particular to a multiplex pulse laser integrated system used in an excimer laser refractive surgical instrument. The method separately uses laser sources to send out light in different times, the light paths of all the laser sources have one intersection; a synthesizing mechanism contains at least one group of reflectors in different angles, a reflector driving device and a synchronizer, wherein the reflector driving device drives the group of reflectors to circularly pass through the intersection one by one, and the angle of each reflector in the group of reflectors corresponds to the laser sources so that when the reflector driving device drives the group of reflectors to pass through the intersection one by one, light sent by the laser sources passes through the corresponding reflector and is reflected to be in one light path. Therefore, the laser light source of the excimer laser refractive surgical instrument can satisfy the demands of high pulse frequency, high energy stability and enough pulse energy and the technical solution is provided for the clinical application of the excimer laser refractive surgical instrument.

The invention provides a flexible-transition high-low-frequency double-pulse MIG welding waveform modulating method. The method is characterized by including the steps of setting a high-low-frequencyflexible-transition double-pulse MIG welding waveform into a trapezoidal wave high-low-frequency double-pulse current waveform or a sine wave high-low-frequency double-pulse current waveform, generating feature parameters, generating a high-frequency pulse time sequence and a low-frequency pulse time sequence, establishing a double-pulse waveform control sub-task, updating a current set value according to a current waveform variation rule, obtaining a current feedback value output by a welding power supply in real time, processing the current set value and the current feedback value through aPID algorithm to obtain a regulating variable, and driving the welding power supply according to the regulating variable. By means of the modulating method, precise waveform output control can be realized, the energy transition form of double-pulse strong and wave pulse groups can be improved, the current interruption and jackscrew cold drawing phenomena in the welding process can be effectively reduced, and the welding stability is improved. The invention further provides a modulating system for implementing the modulating method.

For processing eye tissue (8) by means of femtosecond laser pulses, an ophthalmological device (1) includes a projection optical unit (2) for the focused projection of the femtosecond laser pulses into the eye tissue (8). Disposed upstream of the projection optical unit (2) is a first beam-deflecting scanner system (3) for scanning the eye tissue (8) with the femtosecond laser pulses along a processing line (s). A second beam-deflecting scanner system (5) is disposed upstream of the first scanner system (3) and is designed for scanning the eye tissue (8) with the femtosecond laser pulses on a scanning curve (f) superimposed on the processing line (s). The second scanner system (5) has a scanner speed that is a multiple of the scanning speed of the first scanner system (3), and comprises at least one deflection mirror, a first scanning axis (51) and a second scanning axis (52). A control module (8) controls the deflection of the femtosecond laser pulses about the first scanning axis (51) and the deflection of the femtosecond laser pulses about the second scanning axis (52) in accordance with a defined curve shape, a defined curve amplitude and a defined curve orientation of the scanning curve (f).

A method for generating extreme ultraviolet radiation and soft x-ray radiation with a gas discharge operated on the left branch of the Paschen curve, in particular, for EUV lithography,wherein a discharge chamber (10) of a predetermined gas pressure and two electrodes (11, 12) are used, wherein the electrodes have an opening (14, 15), respectively, positioned on the same symmetry axis (13) and, in the course of a voltage increase (16) upon reaching a predetermined ignition voltage (Uz), generate a plasma (17) located in the area between their openings (14, 15), which plasma is a source of the radiation (17′) to be generated,wherein an ignition of the plasma (17) is realized by affecting the gas pressure and / or by triggering,and wherein, with the ignition of the plasma (17), an energy storage device supplies by means of the electrodes (11, 12) stored energy into the plasma (17), characterized in that the ignition of the plasma (17) is realized by using a predetermined ignition delay (18).

For processing eye tissue (8) by means of femtosecond laser pulses, an ophthalmological device (1) includes a projection optical unit (2) for the focused projection of the femtosecond laser pulses into the eye tissue (8). Disposed upstream of the projection optical unit (2) is a first beam-deflecting scanner system (3) for scanning the eye tissue (8) with the femtosecond laser pulses along a processing line. A second beam-deflecting scanner system (5) is disposed upstream of the first scanner system (3) and is designed for scanning the eye tissue (8) with the femtosecond laser pulses in a scanning movement superimposed on the processing line and running in a deflection plane. The second scanner system (5) has a scanner speed that is a multiple of the scanning speed of the first scanner system (3). A rotation system is provided for aligning the deflection plane with a defined angle with respect to the processing line.

The invention relates to a multipath pulse laser integrated system on a quasi-molecule laser ophthalmic therapy apparatus, realizing the light path synthesis of at least two laser beams through a mechanical mode. A porous rotary wheel (or porous reflecting mirror) is arranged in the multipath pulse laser integrated system, a small hole and the reflecting mirror are alternated by utilizing the rotation of the rotary wheel through a mechanical shutter mode. A light-emitting diode is arranged in front of the rotary wheel, a photoelectric detector is placed behind the rotary wheel, the permeation of the light rays of the light-emitting diode is controlled through the rotation of the rotary wheel, the photoelectric detector can generate voltage timing-sequence signals to control the starting of different lasers, thereby achieving the integration of laser pulses. The multipath pulse laser integrated system ensures that a laser source of the quasi-molecule laser ophthalmic therapy apparatus simultaneously satisfies the requirements of high-pulse frequency, high-energy stability and sufficient pulse energy, and provides a technical solution scheme for the clinical application of the quasi-molecule laser ophthalmic therapy apparatus at present.

The invention discloses a special-purpose high-frequency pulse power supply for an ultrafine micro electric discharge machine tool, which mainly includes two modules, namely a main control module and a high-frequency discharge module. Its power supply discharge voltage and discharge gap are multi-level adjustable, and the two can be combined at will. The invention can adapt to discharge machining of different materials, processing sizes and precisions, and can conveniently expand the pulse power supply to multi-pulse output, so as to adapt to various types of ultra-fine electric discharge processing machine tools.

The present invention provides a surface-emission type semiconductor laser wherein an effective length of a cavity is reduced, thereby enabling to realize a higher-speed direct modulation. In the surface-emission type semiconductor laser according to the present invention, when supposing the optical path length (L) of a resonator part relative to a lasing wavelength λ0 to be given as 0.9×λ0≦L≦1.1×λ0, and denoting the refractive indexes of a high refractive index layer and a low refractive index layer of a dielectric DBR by nH1 and nL1; the average refractive index within an optical path length λ0 / 4 in the semiconductor in contact with the dielectric DBR by nS1; and the refractive indexes of the high refractive index layer and the low refractive index layer of a semiconductor DBR by nH2 and nL2, respective materials to be used are selected so as to satisfy the following conditions (1) and (2):nH1>f(nS1)nL12+g(nS1)nL1+h(nS1),  (1)where f(nS1)=0.0266 nS12−0.2407 nS1+0.6347; g(nS1)=−0.0508 nS12+0.4335 nS1−0.0085; and h(nS1)=0.0382 nS12−0.3194 nS1+0.7398, andnH2−nL2>0.4.  (2)

The invention discloses an electric control type rainproof monitoring camera, and relates to the technical field of monitoring devices. The monitoring camera comprises a monitoring body and a protection cover, wherein the monitoring body is installed at the bottom of the protection cover. The outer side of the end, away from the monitoring body, of the protection cover is installed on a monitoringrod. A heat conducting plate is fixedly connected into the protection cover; one side of the heat conducting plate is in heat conduction connection with the monitoring body; one side, far away from the monitoring body, of the heat conducting plate is fixedly connected with a plurality of conductive springs and power generation sheets; the output ends of the power generation sheets are electrically connected with a controller; and the controller is mounted in the protection cover and is electrically connected with the plurality of conductive springs. In sunny days, the monitoring body gradually generates heat in the continuous working process to increase the temperature in the protection cover, the controller is matched with the thermoelectric power generation sheets to output pulse current to the multiple conductive springs, and the conductive springs pull the sliding plate to move back and forth in the protection cover at intervals, so that hot air in the protection cover is quicklyexhausted, and direct heat dissipation is carried out.

The invention relates to an elevator-brake mute-operation control circuit, which comprises parts, such as a time-delay circuit, an exciting-voltage pulse-width modulating circuit, a modulation-switching circuit, a maintaining-voltage pulse-width modulating circuit, a direct-current stabilized-voltage power supply, a rectifying and wave-filtering circuit, a direct-current wave chopper, a freewheeling circuit, an exciting-voltage tracking and holding circuit, a maintaining-voltage tracking and holding circuit and the like. In the invention, direct-current wave-chopping type adjustment for a direct-current working voltage applied to a magnetic-device coil is carried out through a pulse-width modulation-controlling mode, so that low-frequency electromagnetic noise is eliminated, the mute operation of an elevator brake is realized, the use requirements of a machine-room-less tractor brake are met, meanwhile, various potential safety hazards produced by using a controlled-silicon voltage-regulating circuit are also eliminated, an exciting voltage and a maintaining voltage on the magnetic-device coil are kept unchanged when an electric-network voltage is changed, and the elevator-brake mute-operation control circuit is stable and reliable in working.

The invention relates to a power circuit for a light emitting diode (LED) illuminating lamp. The power circuit is a conversion circuit converting mains supply into direct current ripple voltage with ripple frequency between 100Hz and 200Hz. As the power circuit for the LED lamp can convert the mains supply into the direct current ripple voltage, the LED is switched on to emit light only in a pulse high level receiving time interval but stops emitting light in a pulse low level receiving time interval, and therefore, the LED is in an on / off alternate state, fatigue, caused by long-time continuous working, of the LED, can be avoided, heat productivity is reduced, service life of the LED is prolonged greatly, and consumption of nonferrous materials for a radiator is reduced.

A pulse discharge and ultrasonic wave cooperative biochemical process for the food, medicine, chemicals, etc is prepared of a high-energy instantaneous sterilizing, separating and extracting unit, a low-energy gene extracting, inducing and fusing biofermentor, a sewage treating unit, and a discharge unit with rotary positive and negative electrodes. Its advantages are compact structure and high sterilizing effect.

The invention discloses an optical structure for improving the output frequency of a pulsed laser. The optical structure comprises two polarization beam splitting (PBS) prisms, two tunable wave plates made of electro-optic crystals or magneto-optic crystals, and two cavity mirrors. An original pulsed laser beam is introduced to the cavity of the above optical structure by an electro-optical switch, and the laser output energy can be controlled by adjusting the waveform of the electro-optic wave plate or the magneto-optic wave plate at the rotation time so as to improve the output frequency ofthe pulsed laser and reduce the single-pulse energy without influencing the average power of the original pulse. The output new pulses are of the same sequence in the space.

This invention is an automobile anti-lock device with liquid dual plunger auto pressure-adjustment used for the passenger car and the truck below 8t and the car with over 3.0 liter exhaust. It includes triple body, valve body and outlet nozzle. The triple body is fixed on and connected with the valve body by the connectors, and one side of the valve body the outlet nozzle, the valve body is fixed on and connected with the oil cylinder and form a lumen which is sealed by the O-type lock ring. The close pressure filter screen of the O-type ring can prevent dirty things from entering the oil cylinder in which is installed with slide plunger. The upper and lower ends of the plunger are tightly connected with the stern oil seal and its middle is fixed on two Yx oil seals. The hydraulic oil is injected into the oil cylinder, the self-pressuring spring is set in the plunger and the spring is dipped in the hydraulic oil. The outlet nozzle is connected with the thread of the valve body and its one end is top against the steel ball which another side is top against the outlet valve, which thread is linked with the valve body. The connectors of the base pump, the pinch nut and the triple body can form a variable-position triple valve. This invention can self-adjust the braking pressure in use in order no to lock the wheels and drag the tires. The vehicle will not be off tracking, whipping and sideslip. The steering wheel will not be locked but steered freely and lightly, so it has more obvious anti-lock effect.

A current pulse generator circuit configured to be monolithically integrated into a single semiconductor die and provide high pulsing frequencies. A first GaN FET transistor controls the charging of a capacitor in a boost converter. A second GaN FET transistor controls the discharging of the capacitor through a load, such as a laser diode, connected to the boost converter. Both GaN FET transistors are preferably enhancement mode GaN FETs and may be integrated into the single semiconductor die, together with gate drivers. The diode in a conventional boost converter circuit can also be implemented in the present invention as a GaN FET transistor, and also integrated into the single semiconductor die.

The invention discloses a main engine device of a low-and-medium-frequency therapeutic apparatus. The main engine device comprises a control unit, a collecting unit and a wireless transceiving unit, wherein the collecting unit comprises at least three pulse sensors, the pulse sensors are connected with the therapeutic apparatus through a wired or wireless manner and collect pulse information of the waist, the neck and the head of a person in real time during working of the control unit, the control unit is used for performing comparison operation on pulse data acquired by the collecting unit,and preset relational data about pulses of a human body and working frequencies of the therapeutic apparatus are stored in the control unit and are output and controlled according to rules of the control unit. The main engine device of the low-and-medium-frequency therapeutic apparatus has the advantages that by storing the preset relational data about the pulses of the human body and the workingfrequencies of the therapeutic apparatus in the control unit and outputting and controlling the preset relational data according to the rules of the control unit, physical therapies of the therapeuticapparatus can achieve the best effects, and through cooperation of a data importing manner and real-time detection, customized and precise control over different individuals is realized.

The invention discloses a small-particle negative ion generator. The small-particle negative ion generator comprises a shell and an internal circuit, wherein the shell comprises a lower shell, an intermediate shell and an upper shell, a power supply circuit is arranged in the lower shell and comprises a rectification circuit, a buck I circuit and a buck sampling circuit, a boost circuit is arranged in the intermediate shell and comprises an oscillation circuit and a multi-stage voltage doubling circuit, the power supply circuit is connected with the boost circuit, the boost circuit is connected with an ion releaser in the intermediate shell through a resistor R1 and a high-voltage line, and the ion releaser comprises a circuit board, a superconduction sheet, a converter, a discharge needle or a discharge brush and is a nano fullerene negative ion releaser. By the small-particle negative ion generator, the problem of low ion escaping efficiency in an enclosure of an existing ion generator is solved, and the application effect of the negative ion generator is greatly improved.

The invention discloses a thin film transistor substrate, a display panel, and a laser annealing method, aimed at obtaining a TFT substrate which has high charge mobility, high potential holding characteristics, and low power consumption, by improving throughput of laser annealing, and performing laser annealing by irradiating a laser beam pattern within a TFT channel width at a high accuracy. Disclosed is a thin film transistor substrate 1 wherein a plurality of thin film transistors 10 are disposed in columns and rows on a substrate 1A. The thin film transistors 10 are respectively provided with laser annealed sections 10A formed by laser annealing amorphous silicon layers 13 into polysilicon layers, said amorphous silicon layers forming channel regions, the laser annealed sections 10A are disposed at a set pitch in the scanning direction S in which the substrate and a laser beam for performing the laser annealing relatively move, and the thin film transistor substrate has each of the laser annealed sections 10 within a channel width W formed in the direction orthogonal to the scanning direction S, said each of the laser annealed sections having a width smaller than the channel width.

The invention discloses a metal shell welding method which is suitable for a lithium battery shell. The metal shell welding method comprises the steps of laminating and stacking an upper metal shell and a lower metal shell on a clamp base, and pressing the upper metal shell and the lower metal shell by a clamp pressing block, wherein the flatness of the binding surface of the clamp pressing block and the clamp base is less than 0.05 mm; and scanning the surface of the metal upper shell along the welding track by adopting a nanosecond laser to form a welding seam to connect the metal upper shell and the metal lower shell. According to the metal shell welding method, the flatness of the binding surface of the clamp pressing block and the clamp base is 0.05 mm or less, the binding degree of the clamp and the upper metal shell and the lower metal shell is improved, meanwhile, the nanosecond laser is adopted for welding, compared with a quasi-continuous laser, the advantages of being high in pulse frequency, concentrated in energy density, small in heat affected zone and the like are achieved, the phenomena of tilting, deformation and the like of the metal shell in the welding process are reduced, and the sealing performance of the metal shell is improved.

The invention relates to fatigue test equipment. The invention discloses a pulse fatigue test device for a pressure vessel. The device comprises a pneumatic loop and a hydraulic loop which are respectively connected with a test container (1). A pneumatic control device is arranged on the pneumatic loop. The air pressure in the test container (1) can be controlled through the pneumatic control device. A hydraulic control device (3) is arranged on the hydraulic loop so that the liquid level in the test container (1) can be controlled through the hydraulic control device (3), and an air pressuredetection unit (4) used for detecting air pressure and a liquid level detection unit (5) used for detecting the liquid level are arranged in the test container (1). According to the invention, the actual working condition of the pressure vessel can be better simulated, so that the result of the fatigue test is more accurate.

The invention discloses a method for optimizing the X-ray pulse dose waveform in the pulse mode. In the pulse mode, the enabling signal of the filament power supply in the pulse mode circuit is preceded by the enabling signal of the inverter drive, and the filament circuit is preheated to improve the The rising edge rate of the X-ray pulse dose in the pulse mode; on the basis of the original flyback circuit, the improved circuit of the filament is formed by adding the transformer winding N3, the Mos tube Q2, the inductor L1, the damping resistor Rs, and the bidirectional trigger diode DB3, so as to reduce the filament double The voltage at the terminal and the activity of free electrons accelerate the falling edge rate of the X-ray pulse dose in the pulse mode. The method can speed up the rate of the rising and falling edges of the X-ray dose, make the actual X-ray pulse dose waveform more tend to the ideal pulse shape, improve the image quality of X-ray imaging, and reduce the invalid X-ray dose received by the patient.