11 results about "Small pulse" patented technology

The invention relates to the technical field of in vitro diagnosis, and discloses a flow chamber assembly, an optical detection system and a sample analyzer, the flow chamber assembly comprises a mounting seat and a flow chamber; the mounting seat is provided with a rotary adjusting structure, and the rotary adjusting structure is used for arranging the flow chamber on a base of the optical detection system in a left-right rotating manner; the flow chamber is used for enabling to-be-detected particles of a detected sample to pass through one by one so as to generate scattered light capable of being used for detection under laser irradiation of the optical detection system. The flow chamber rotates left and right on the base of the optical detection system, so that the angle of the flow chamber assembly in the left-right direction can be adjusted, the angle of reflected light generated when a laser beam is propagated in a light path is further adjusted, and the purpose that the reflected light of laser cannot enter a laser is achieved; the problem that the detection precision is affected by small pulses generated by power peaks generated when reflected light enters a laser is solved.

The invention discloses a preparation method of a small pulse broadening drift tube for ultrafast diagnosis and the pulse broadening drift tube thereof. The method comprises the following steps: 1) brazing a front shell and a rear shell, and carrying out indium filling, indium melting and indium turning operation on the front shell; 2) performing spot welding to obtain a first grid mesh assembly, a second grid mesh assembly and a third grid mesh assembly; 3) preparing a substrate, a conductive film layer and a sealing film layer, and assembling to obtain a cathode input window; (4) sealing the metal anode flange, the frit ring and the optical fiber panel at high temperature, and plating a metal layer on the small surface of the optical fiber panel to prepare an anode assembly; (5) the first grid mesh assembly and the second grid mesh assembly are assembled on the front shell to obtain the front shell provided with the front assembly; and 6) preparing a cathode input window and a cathode at the rear end, degassing at high temperature, electronically brushing and sealing indium at high vacuum degree to obtain the small pulse broadening drift tube which can meet the requirements of the technical fields of nuclear detection, high-energy physics and the like on ultrafast diagnosis equipment.

A system includes: an inverter including a first switch and a second switch; one or more controllers configured to control the inverter by performing operations, the operations including: generating a minimum pulse width value for a first pulse-width modulated (PWM) signal to control the first switch and for a second PWM signal to control the second switch; determining that an on-time pulse to be generated for the first PWM signal will be less than or equal to the minimum pulse width value for a period based on a first deadtime configuration; and in response to the determining: determining a second deadtime configuration for the first PWM signal and the second PWM signal for the period; and generating the first PWM signal and the second PWM signal based on the second deadtime configuration, to prevent the on-time pulse that is less than or equal to the minimum pulse width value.

The invention relates to an inverter wave sealing method, an inverter wave transmission recovery method and an inverter wave transmission recovery system. The inverter wave sealing method comprises the following steps: setting a first time delay, and continuously detecting a driving signal and a wave sealing signal of an inverter; after it is detected that the wave sealing signal is triggered, a target phase triggering wave sealing is determined, the target phase is immediately subjected to wave sealing, and other non-triggering wave sealing phases normally emit waves; the first switching tube of the non-triggering wave sealing phase is naturally switched off after the falling edge is ended, so as to stop generating the rising edge, and a first delay is started; and after the first time delay is finished, the second switch tube of the non-triggering wave sealing phase is turned off. According to the invention, the target phase and the non-trigger wave sealing phase for triggering wave sealing are classified, the target phase adopts immediate wave sealing, and the non-trigger wave sealing phase adopts natural turn-off of the first switching tube and does not interrupt the normal beat of the non-trigger wave sealing phase, so that the non-trigger wave sealing phase can be prevented from generating small pulse width due to sudden wave sealing, the risk of failure of the power module is effectively reduced, and the reliability of the power module is improved. And the overall operation stability and safety of the inverter are improved.

This application discloses a method and system for determining cross-scale bridges of femtosecond laser process parameters. By establishing a local response library containing small pulse memory states at the nanoscale, and then mapping the local removal response at the nanoscale to the macroscopic pit shape at the micrometer scale through convolutional epitaxy, a quantitative cross-scale correlation can be established between the atomic-scale microscopic removal mechanism captured by dual-temperature-molecular dynamics and the micro-pit morphology and processing mode at the experimental scale without performing full-scale, full-pulse molecular dynamics brute-force calculations. This preserves the interpretability of the microscopic mechanism and can directly inversely obtain the equipment process parameters applicable to actual processing, effectively reducing the experimental cost of femtosecond laser process development, solving the long-standing spatial scale breakage problem of TTM-MD, improving multi-pulse prediction capability, and enhancing the ability to inversely obtain process parameters.

The invention discloses an isolated small pulse-to-large pulse relay drive circuit, which comprises a direct current power supply, an input instruction filter circuit, an electrical isolation circuit, a logic conversion circuit, a drive capacity expansion circuit and a relay solenoid circuit, wherein the direct-current power supply is respectively connected with the electrical isolation circuit, the logic conversion circuit, the driving capacity expansion circuit and the relay coil circuit; the input instruction filter circuit is connected with the electrical isolation circuit; the electrical isolation circuit is connected with the logic conversion circuit; the logic conversion circuit is connected with the driving capacity expansion circuit; and the driving capacity expansion circuit is connected with the relay coil circuit.

The application relates to a laser processing method, device, equipment and circuit board. The method comprises the following steps: acquiring a processing position of a piece to be processed; controlling a first pulsed laser of a laser processing device to output a first laser beam to the processing position, so that the processing position is melted; and controlling a second pulsed laser of the laser processing device to output a second laser beam to the processing position, so that the molecular bonds of the melted material are broken and removed. The pulse width of the first laser beam is greater than the pulse width of the second laser beam. The piece to be processed is processed in stages by using the laser beam with a larger pulse width and the laser beam with a smaller pulse width: the first laser beam makes the material structure of the piece to be processed easy to process, and the second laser beam breaks the molecular bonds of the material which has become easy to process and removes the material, so that a precise, reliable and relatively smooth processing surface is obtained. Thus, the processing requirements of the circuit board made of new materials such as ceramic substrates and glass substrates can be met, and high processing precision is ensured.

The application discloses a microprocessor-based variable narrow pulse and high PRF control system and method, which comprises a master ARM core module, a clock module and a timer module, the clock module and the timer module are connected with the master ARM core module, the timer module comprises at least two cascaded hardware timers, wherein a first timer TIM5 is configured as a master mode timer, and a second timer TIM2 is configured as a slave mode timer; a trigger output end of the master mode timer is connected with a trigger input end of the slave mode timer, thereby forming a timer linkage structure; the master mode timer is configured to control a pulse repetition frequency PRF, and the slave mode timer is configured to control a pulse width; the clock module is frequency-multiplied through a phase-locked loop to serve as a timer reference clock source. The system can support super-narrow pulse generation, has small pulse width output and small jitter, and the pulse width can be adjusted, so that the cost is reduced, the system is small in size and modular, and is convenient for commercial integrated application.

The application discloses a design method of a high-repetition working frequency pulse power supply, belonging to the technical field of pulse power technology. The design method comprises the following steps: determining a load working condition, including the pulse current demand and the repetition working frequency of each load; designing a pulse inductor, calculating the equivalent working frequency and the thermal load of the pulse inductor according to the pulse current demand and the repetition working frequency of each load, and optimizing the pulse inductor to meet the temperature rise requirement; designing a thyristor, determining the highest repetition working frequency of a single thyristor, and determining the required number of thyristors for each load; and controlling the discharging time sequence, setting the discharging time sequence of each thyristor to meet the repetition working frequency demand of each load. The application can realize the repetition working frequency operation of the pulse power supply with multiple loads, improve the component utilization rate, reduce the volume of the pulse power supply, reduce the thermal load of a single thyristor through the time-sharing multiplexing of the thyristor, and improve the service life of the thyristor and the system reliability.

The present application relates to the technical field of laser control. Provided is a laser current control method for suppressing laser relaxation oscillations. The method comprises: controlling a current signal of a preset waveform to be input into a laser driving circuit, wherein the preset waveform comprises a first stage and a second stage, the amplitude of the first stage is less than the amplitude of the second stage, and the amplitude of a laser relaxation oscillation waveform induced by a current signal of the first stage is less than a safety threshold value; and on the basis of a relationship between an average laser output power and a driving current, adjusting the amplitude of the second stage. In the embodiments of the present application, a small-step current waveform is designed, thereby effectively suppressing the damage caused by laser relaxation oscillations to optical devices in an optical path; a smaller pulse distortion causes threshold currents corresponding to different pulse frequencies to exhibit linearity under the same duty cycle, such that it is unnecessary to record, one by one for each duty cycle, the threshold currents and linear equations in one variable that correspond to the frequencies; and an output current can be more accurately and precisely adjusted to obtain the required average terminal power.