156 results about "Pulsed mode" patented technology

A system of adjusting the phase of a user's circadian rhythms, said system comprising: a high EML light source configured for delivering pulsed high EML light in a pulsed mode of operation, wherein the pulsed high EML light has a frequency and intensity sufficient to effect circadian phase adjustment in said user, and secondary functionality comprising transmitting electromagnetic radiation (EMR) to said user.

A charge detection mass spectrometer includes an ion trap configured to store ions therein and to release stored ions therefrom, and an electrostatic linear ion trap (ELIT) array, in the form of at least two ELITs or ELIT regions each spaced apart from the ion trap, each ELIT or ELIT region including first and second ion mirrors and a charge detection cylinder positioned therebetween. The ion trap is controlled to release at least some of the stored ions to travel toward and into each of the ELITs or ELIT regions, and the first and second ion mirrors of each of the ELITs or ELIT regions is controlled in a manner which traps one or more ions traveling therein and causes the trapped ion(s) to oscillate back and forth between the first and second ion mirrors each time passing through and inducing a corresponding charge on the charge detection cylinder.

Systems and methods can facilitate wide broad-band IVUS for peripheral vascular applications with simultaneous improved resolution and penetration depth. A custom analog front end interface can withstand large voltages and recover to receive a sub-mV pulse from less than one mm away. The custom analog front end interface can be on an interface chip that can be sized to be integrated within a tip of the IVUS catheter to connect micro-cables within the IVUS catheter to the broad-band transducer. The interface chip can also include a dual-stage amplifier having a pulse mode configured to withstand voltage pulses greater than 30 VPP during pulsing and an echo reception mode configured to receive sub-mV echoes during echo reception.

Additive manufacturing systems and associated methods are disclosed herein. In some embodiments, the additive manufacturing system includes a build chamber that has an active build region, an energy beam system positioned to direct energy beams toward the active build area, and a controller operably coupled to the energy beam system. During an additive manufacturing process, the controller can control the energy beam system to execute a hybrid sintering process. For example, for a first region of a planned build object, the controller can operate the energy beam system in a continuous wave mode to generate a first energy beam to sinter powder in the first region. Then, for a second region, the controller can operate the energy beam system in a pulsed mode to generate a second energy beam with to sinter the second region.

The utility model discloses a composite laser polishing device based on ultrasonic micro-forging, which comprises a sealed cabin, a three-axis guide rail system arranged in the sealed cabin and driven by a motor, a rotating disc arranged on a Z-axis direction movement guide rail, a replaceable working panel mounted on the rotating disc, an inflation switch, an exhaust switch and a clamp mounted on the working panel, the ultrasonic micro-forging device cabin is arranged on the Z-axis direction movement guide rail; and the ultrasonic generator is matched with the ultrasonic micro-forging device cabin. A cabin pressure detection sensor and an oxygen concentration sensor are arranged in the sealed cabin; the system further comprises an infrared optical fiber laser, an integrated ultraviolet optical fiber laser and corresponding optical assemblies. According to the polishing device, an oxide layer on the surface of a workpiece is removed in a pulse mode of the infrared laser, and then the continuous mode is switched for fine polishing. The ultraviolet laser adopts a pulse mode to assist in machining, and the ultraviolet laser and the pulse mode cooperate to improve the polishing effect. And after polishing is completed, the surface of the workpiece is subjected to strengthening treatment through an ultrasonic micro-forging device.

A method for preparing a surface of a workpiece includes selecting a target area on the surface of the workpiece for ablation in a multi-pass approach using an ultraviolet laser scanner and performing four ablation passes of the target area with the ultraviolet laser scanner in a pulsed mode. Each ablation pass includes a start leg, a shift and a return leg. Another method for preparing a surface of a workpiece includes selecting a target area on the surface of the workpiece for ablation in a multi-pass approach using an ultraviolet laser scanner and performing a first ablation pass of the target area with the ultraviolet laser scanner in a pulsed mode. The first ablation pass includes a first start leg, a first shift and a first return leg. A laser ablation system for preparing a surface of a workpiece includes a computing device and an ultraviolet laser scanner.

The invention provides an electric tungsten fire needle tumor ablation system, and the system comprises an image navigation module which is used for integrating CT / MRI / ultrasonic images, constructing a three-dimensional tumor model in real time, tracking a target region through electromagnetic positioning, and dynamically calibrating a needle insertion path; the insulating tungsten fire needle execution module is used for adopting a high-density tungsten alloy needle body and a multi-axis mechanical arm to control multi-angle puncture; the energy output module is used for intelligently adjusting radio frequency / microwave power and releasing energy in a pulse mode; and the temperature control feedback module is used for monitoring the temperature in real time and automatically terminating overheating energy. According to the technical scheme, accurate, safe and effective ablation of tumors is achieved.

According to various embodiments, a method for reducing heading error in a magnetometer that uses Rb-87 atoms is disclosed. The method includes varying a direction and magnitude of a magnetic field at different spin polarization regimes. According to various embodiments, a magnetometer adapted for reduced heading error is disclosed. The magnetometer includes a multipass cell containing Rb-87 vapor, a pump laser operated in a pulse mode that is synchronous with a Larmor frequency, and two orthogonal probe lasers configured to rotate to vary a direction and magnitude of a magnetic field at different spin polarization regimes.

The invention relates to a well hole acoustoelectric intelligent fusion anti-reflection, yield-increasing and efficiency-increasing system and method, and the system comprises an ultrasonic generator which is used for generating ultrasonic waves meeting preset frequency and power conditions; the transient electromagnetic field generator is used for generating a transient electromagnetic field corresponding to the ultrasonic waves; the data monitoring module is used for monitoring environment change in the well hole to generate monitoring data of the well hole; and the control module is used for generating a parameter combination meeting the preset optimal working condition according to the monitoring data, adjusting the pulse mode of the ultrasonic generator according to the parameter combination, adjusting the working parameters of the ultrasonic wave and the transient electromagnetic field according to the pulse mode and the monitoring data, and obtaining a well hole acoustoelectric coupling result meeting the preset optimal condition. Therefore, the problems of high cost, low efficiency and environmental pollution faced by oil and gas field yield increase and the problems of low geothermal recharge efficiency faced by geothermal resource exploitation are solved.

The application relates to the technical field of welding, and discloses a pulse ring-shaped light spot laser welding method and a laser welding device. The method comprises the following steps: controlling a laser emitter to emit a first laser beam and a ring-shaped laser beam arranged around the periphery of the first laser beam, so that the first laser beam and the ring-shaped laser beam irradiate a to-be-welded area; controlling the ring-shaped laser beam to preheat the to-be-welded area in a first pulse mode; under the condition that the to-be-welded area reaches a preset temperature, controlling the first laser beam to heat the to-be-welded area at a first power; under the condition that the to-be-welded area is heated to form a molten pool, controlling the first laser beam and the ring-shaped laser beam to synchronously move along the extension direction of a weld at a first welding speed, and controlling the power of the first laser beam to be constant and controlling the ring-shaped laser beam to complete welding of the to-be-welded area in a second pulse mode. The application discloses the pulse ring-shaped light spot laser welding method and the laser welding device, and solves or improves the problem of poor weld quality.

The invention relates to the technical field of laser processing, and discloses a metal polymer composite material cutting process which comprises the following steps: placing a to-be-cut piece on a cutting platform; the to-be-cut piece comprises a metal layer and a polymer layer which are stacked; adjusting parameters of an output laser beam of the laser; the output wavelength lambda of the laser is controlled, so that the laser generates green laser, and the polymer layer is subjected to cold cutting; the value of the output power P and the value of the output pulse frequency f of the laser are controlled, so that the green laser is emitted in a pulse mode, and laser energy is concentrated and acts on the metal layer at intervals; according to the cutting process of the metal polymer composite material, the two-photon energy of the green laser is sufficient to reach the fracture energy of molecular bonds of the polymer layer, the polymer layer can be directly cut without reaching the melting point of the polymer layer, the energy of the pulse laser is concentrated and spaced, and the heat influence caused by cutting the metal layer is discontinuously generated; therefore, the influence on the interface of the metal layer and the polymer layer is reduced, and the cutting quality is improved.

A charge detection mass spectrometer includes: an ion trap configured to receive and store ions therein and selectively release the stored ions therefrom; and an electrostatic linear ion trap (ELIT), the electrostatic linear ion trap (ELIT) being spaced apart from the ion trap, the ELIST comprising a first ion mirror and a second ion mirror and a charge detection cylinder positioned therebetween; and means for selectively controlling the ion trap to release at least some of the stored ions therefrom to travel toward and into the ELIST, and for controlling the first ion mirror and the second ion mirror in a manner that captures in the ELIST a single of the ions traveling therein, and causing the trapped ions to oscillate back and forth between the first ion mirror and the second ion mirror each time the trapped ions pass through the charge detection cylinder and a corresponding charge is induced thereon.

1. The name of the product of this design: Pulse energy control graphical user interface for electrohydraulic lithotripsy. 2. Purpose of the product with this design: The electrohydraulic lithotripter is used to treat urinary stones and stones in gallbladder and pancreatic diseases, and uses shock waves generated by high-voltage electric pulses to break up stones in the body; the pulse energy control graphical user interface is used to adjust the size of the pulse energy, select the pulse mode, and display the value and change status of the pulse energy. 3. The key design point of this design product lies in the content of the product's graphical user interface. 4. The picture or photo that best illustrates the design points: Interface change state diagram 2. 5.Purpose of the graphical user interface: The pulse energy control graphical user interface is used to adjust the pulse energy, select the pulse mode, and display the value and change status of the pulse energy. 6. The area of ​​the graphical user interface in the product: the display screen of the main view. 7. Human-computer interaction of the graphical user interface: After booting up and entering the pulse energy control main interface (the user interface in the main view), click Single Pulse in the Pulse Mode column on the right. The option changes color, indicating that the Single Pulse option is selected. The "lightning" icon in the energy ring in the middle of the interface changes to a "Single Pulse" icon (as shown in the interface change state Figure 2). Click the plus circle or minus circle below the energy to adjust the energy value. The energy value is adjusted within the range of 0-400MJ. The pointer of the corresponding energy ring will point to the adjusted energy value (as shown in the interface change state Figure 2-8); click the Start / End option in the lower left corner of the main interface (as shown in the interface change state Figure 9) to start or end energy transmission.

The invention provides an optical coherence tomography system based on a single-cavity dual-frequency comb ytterbium-doped fiber mode-locked laser, belonging to the technical field of optical coherence tomography; the invention solves the problems of great technical difficulty and high cost in the existing dual-frequency comb for optical coherence tomography; the invention comprises: a single-cavity dual-frequency comb ytterbium-doped fiber mode-locked laser module, an amplification and sample scanning module and a signal acquisition module; in the single-cavity dual-frequency comb ytterbium-doped fiber mode-locked laser module, a polarization-maintaining fiber and a single-mode fiber with a certain amount of polarization birefringence are introduced into a single fiber ring cavity to enhance the intracavity birefringence and nonlinear effects, realize gain spectrum filtering under different wavelength windows, and use a semiconductor saturable absorption mirror to realize passive mode locking of the ytterbium-doped fiber laser, thereby obtaining single-cavity full-positive dispersion dual-frequency comb pulse mode locking; the invention is used for dual-frequency comb acquisition of optical coherence tomography.

A focal plane array for a detector is configured to switch between an integrating mode, in which the focal plane array is configured to receive light over an integration time and convert it into an electrical signal after the integration time has elapsed, and a pulsed mode, in which the focal plane array is configured to receive light and convert it directly into an electrical signal, without waiting for the integration time to elapse.

This invention provides a multi-wavelength mode-locked fiber laser with adjustable wavelength spacing. It comprises a nonlinear amplifying ring consisting of a pump source (01), a wavelength division multiplexer (02), an erbium-doped fiber (07), a 3km single-mode fiber (08), a three-ring polarization controller (041), a coupler (03), and an optical fiber conduit (12) to achieve pulse mode-locking. A mode selection coupler (05) is used to convert from the fundamental mode to higher-order modes. An improved Sagnac ring consisting of a coupler (06), an optical fiber conduit (17), a three-ring polarization controller (042, 043), and polarization-maintaining fibers (09, 10) is used to achieve multi-wavelength and adjustable wavelength spacing. This multi-wavelength mode-locked fiber laser can achieve multi-wavelength pulsed mode-locked laser with adjustable output wavelength spacing and can be widely used in wavelength division multiplexing, optical communication, optical sensing systems, and other fields.

Device for controlling at least one light-emitting diode (LED1) to generate short light pulses (LP),- with an H-bridge (H) consisting of a first half-bridge (HB1: T1, T2) with a first transistor (T1) and a second transistor (T2) and a second half-bridge (HB2: T2, T3) with a third transistor (T3) and a fourth transistor (T4),- wherein the H-bridge (H) is controlled by a control unit (ST) and- wherein the H-bridge (H) can be operated by the control unit (ST) in pulsed mode (GPB) and in quasi-continuous mode (QDB) and- wherein the first half-bridge (HB1: T1, T2) is supplied with electrical energy from a first positive supply voltage (VCC1) and a first negative supply voltage (GND1) and- wherein the second half-bridge (HB2: T3,T4) is supplied with electrical energy from a second positive supply voltage (VCC2) and a second negative supply voltage (GND2) and- wherein the light-emitting diode (LED1) is connected with its cathode (K) to the output of the first half-bridge (HB1: T1, T2) and- wherein the light-emitting diode (LED1) is connected with its anode (A) to the output of the second half-bridge (HB2: T3, T4) and- wherein the first positive supply voltage (VCC1) and the second positive supply voltage (VCC2) can be equal and- wherein the first negative supply voltage (GND1) and the second negative supply voltage (GND2) can be equal and- wherein the light source, in particular the one or more light-emitting diodes (LED1), represents the load of the H-bridge (H) between the output of the first half-bridge (HB1: T1, T2) and the output of the second half-bridge (HB2: T3, T4) and- wherein the control device (ST) is designed to operate in pulsed mode (GPB) a “PAn” condition,in which a forward voltage in the forward direction of the light-emitting diode (LED1) is applied to the light-emitting diode (LED1) through the H-bridge (H), is not maintained by the H-bridge (H) for longer than a turn-on time (τpp), and- wherein the control device (ST) is designed so that in pulsed operation (GPB) a "PAus" state, in which a reverse voltage against the forward direction of the light-emitting diode (LED1) is applied to the light-emitting diode (LED1) through the H-bridge (H), is not maintained by the H-bridge (H) for longer than a clearing time (τpn), and- wherein the clearing time (τpn) is less than the charge carrier lifetime (τ) in the PN junction of the light-emitting diode (LED1), and- wherein the turn-on time (τpp) is less than the charge carrier lifetime (τ) in the PN junction of the light-emitting diode (LED1).

The invention provides medical laser equipment compatible with monopulse and dipulse modes, and relates to the technical field of laser equipment.The medical laser equipment is characterized in that a beam combining module is arranged between a first laser transmitter and a coupling module, and the coupling module can directly receive a first light beam generated by the first laser transmitter; a second light beam generated by the second laser transmitter is reflected by the reflection module and the beam combining module and is transmitted into the coupling module, the first light beam and the second light beam sequentially pass through the coupling module, the time interval between the first light beam and the second light beam is variable, when the interval time is the reciprocal of the working frequency, the mode is a single pulse mode, and when the interval time is extremely short (ms level), the mode is a double pulse mode; in the double-pulse mode, the total pulse energy is the sum of the single pulse energy of the first light beam and the single pulse energy of the second light beam, that is, in the double-pulse mode, each single pulse energy is half of the existing single pulse energy, the single pulse energy is lower, the pulse interval is closer, the efficiency is high, and the safety is improved.

The invention discloses a method for improving corrosion resistance of a pure aluminum surface in a NaCl solution, and relates to the technical field of high-current pulsed ion beams, an experiment is carried out on a TEMP-6 type HIPIB device, and a polymer anode unipolar pulse mode external magnetic insulation ion diode is adopted to generate 70% C and 30% H ion beams for an irradiation experiment; the ion beam parameters are as follows: the acceleration voltage is 300kV, the pulse width is 70-80ns, the beam density is 100A / cm < 2 >, the irradiation frequency is five times, and the background vacuum degree of a vacuum chamber during irradiation is 10 <-3 > Pa.

Matching circuitry is disclosed for power generation in a plasma processing apparatus or other application. Matching circuitry is provided in a unitary physical enclosure and is configured to provide impedance matching at multiple different frequencies. For example, in a dual frequency implementation, first and second RF generators can provide electromagnetic energy at first and second respective frequencies in a continuous mode or a pulsed mode to matching circuitry that includes first and second circuit portions. The first circuit portion can include one or more first tuning elements configured to receive RF power at a first frequency and provide impedance matching for a first ICP load (e.g., a primary inductive element). The second circuit portion can include one or more second tuning elements configured to receive RF power at a second different frequency and provide impedance matching for a second ICP load (e.g., a secondary inductive element).

A generator device for generating an arbitrary optical pulse pattern includes:a light source to provide primary laser pulses,a distributor to provide a plurality of primary optical pulses by distributing light of the primary laser pulses (LB00k) into a plurality of branches,a combiner to form an output signal by combining modulated optical signals from the branches, anda controller unit to provide control signals for controlling optical modulators of the branches,wherein a first branch comprises a first optical modulator to form a first modulated optical signal from primary optical pulses of the first branch,wherein a second branch comprises a second optical modulator to form a second modulated optical signal from primary optical pulses of the second branch, andwherein a propagation delay of the second branch is different from a propagation delay of the first branch.

The present disclosure provides a fusion system and method for radiation imaging and radioactive material monitoring of a baggage or package item. The fusion system includes a radiation imaging subsystem configured to operate in a pulsed mode to radiation image the baggage or package item, a radioactive material monitoring subsystem configured to operate in a pulsed mode to monitor whether the baggage or package item contains radioactive material, and a synchronization control subsystem in communication with both the radiation imaging subsystem and the radioactive material monitoring subsystem and configured to control the radiation imaging subsystem and the radioactive material monitoring subsystem to operate alternately.

The application provides a saturable absorption device, a preparation method and a low-threshold starting pulse mode-locked laser, and relates to the technical field of lasers. The application discloses a method for preparing a high-quality bismuth copper selenium oxide single crystal by a chemical vapor transport method, and a saturable absorption device prepared by simply using the high-quality bismuth copper selenium oxide single crystal can be applied to a pulse mode-locked laser, and can generate super-short pulse laser output, has high stability and a high signal-to-noise ratio, and has a low starting threshold.

The invention discloses an application method of a pulse mode in linear speed regulation of an electric tool. The application method aims at solving the problem that in the prior art, when an impact screwdriver deals with locked-rotor, the requirements for locked-rotor avoidance, linear power output and operation hand feeling optimization cannot be met at the same time. According to the technical scheme, when the electric tool carries out load operation and a central control chip detects that the electric tool is locked, a pulse mode is automatically started, then the duty ratio is increased by continuously pressing a pressing switch, and therefore the torque of a main shaft is gradually increased till critical impact torque is broken through and an impact state is entered, and at the moment, the pulse mode is quitted. In the pulse process, even if the instantaneous output energy is continuously increased, the average output power is low, the situation of hand twisting can be avoided, along with pressing of the pressing switch, the handheld part can obviously feel feedback of force, and the feedback is in linear positive correlation with the pressing switch.

The embodiment of the present application provides a backscatter detection device and imaging method, equipment and storage medium. The method includes: using a cold cathode X-ray source to work in pulse mode, and modulating the pulsed rays into a fan-shaped ray beam through a front collimator component to solve the contradiction between scanning speed and image quality, and constraining the receiving range of the backscatter detector component to the backscatter photons through the collimation channel formed by the backscatter collimator component, and then the backscatter detector component receives the target backscatter photons passing through the collimation channel, and generates a backscatter electrical signal based on the target backscatter photons and transmits it to the processor, and the processor generates a backscatter image of the inspected object based on the backscatter electrical signal. It avoids the single-frame backscatter data from being affected by the jitter or movement of the detection device, and realizes instant scanning and high-quality dynamic imaging.

Method for operating a fine sieve machine (1) with at least one sieve deck (10) for receiving at least one sieve lining (21) and at least one ultrasonic vibration exciter (23) for generating ultrasonic vibrations which are transmitted to the sieve lining (21), characterized in that the at least one ultrasonic vibration exciter (23) is operated in pulsed mode, wherein the ultrasonic vibration exciter (23) repeatedly switches between a first operating mode with a first vibration amplitude and a second operating mode with a second vibration amplitude that is smaller than the first.

The invention discloses reactive ion etching equipment and an etching method for processing a semiconductor device, and relates to the technical field of semiconductor etching, and the reactive ion etching equipment comprises a reaction cavity which is provided with an upper gas distribution area and a lower sample placement area; wherein at least a first chamber and a second chamber are formed in the reaction chamber, the first chamber and the second chamber cover part of the wafer, and airflow control units are arranged in the first chamber and the second chamber; etching gas passes through the plasma from top to bottom and forms a sheath layer above the sample stage, so that ions generated by the plasma pass through the sheath layer and then are incident towards the surface of the wafer. Through the combination of structural partition, movable recovery and variable gas supply, sample table cooperation and closed-loop sequential control, the etching stability in a continuous mode is kept, the influence of by-product accumulation on the etching precision in a pulse mode is reduced, and the repeatability, the selective control capability and the device yield of pulse etching are improved.

The present application discloses a wide-band saturable absorber and a multi-soliton state laser. In the first aspect of the present application, the application of two-dimensional germanium sulfide in saturable absorber materials, saturable absorber devices, lasers and equipment is provided. According to the application of the embodiments of the present application, at least the following beneficial effects are achieved: the applicant discovered during the experiment that the GeS two-dimensional material has a narrow band gap of about 1.6 eV, and the size of the band gap can be tuned by external strain, so it is inferred that it has a wide-band saturable absorption, and the wide-band responsiveness of the saturable absorber device based on the GeS two-dimensional material is confirmed by experiments. Furthermore, the laser made of the saturable absorber device based on the GeS two-dimensional material has good tolerance to high pump power, and pulse splitting will occur under high pump power, resulting in multi-pulse mode locking and harmonic mode locking, and the generation of multi-soliton state phenomenon, so that this laser has certain research value and application value.

The invention relates to a method for operating a fuel cell system (1) comprising a fuel cell stack (2) with a cathode (2.1) and an anode (2.2), wherein hydrogen is supplied to the anode (2.2) via an anode circuit (3), which is taken from a tank and metered into the anode circuit (3) by means of a hydrogen metering valve (4), and wherein anode gas containing residual hydrogen exiting the anode (2.2) is recirculated via the anode circuit (3). According to the invention, the hydrogen metering valve (4) is operated in pulsed mode, at least temporarily, particularly during partial load operation, so that pressure pulses promoting water discharge are generated in the anode circuit (3) and in the anode (2.2). The invention further relates to a control unit for executing the method or process steps.

The invention provides a laser-arc composite full penetration welding method capable of overcoming the splashing defect, which comprises the following steps: S1, processing a groove in the to-be-welded surface of a to-be-welded workpiece, polishing and cleaning the to-be-welded surface and the groove after processing, and then attaching and fixing the to-be-welded surfaces of the two to-be-welded workpieces; and S2, the laser machining head and the MIG welding gun are fixed, the included angle between the angle of the laser machining head and the central axis of the MIG welding gun ranges from 15 degrees to 30 degrees, then a welding machine and a laser device are started, and laser-electric arc hybrid welding is completed under protection of the electric arc and laser hybrid heat source and the protective gas. According to the method, after the MIG welding gun is adjusted to be in the pulse mode and the arc length correction coefficient is adjusted to be-18%--24%, the splashing problem existing in laser-electric arc composite connection can be perfectly solved, additional cost input is not needed in the whole process, and the method is suitable for large-scale industrial production and has very high popularization value.