8 results about "Pulse front" patented technology

This invention discloses an extreme ultraviolet (EUV) time-delay compensated monochromator, processing method, and electronic device, relating to the field of EUV light processing technology. The monochromator includes: a first optical structure comprising a first planar blazed grating and a first ring mirror, wherein the first planar blazed grating is used to split and diffract the incident light, and the first ring mirror is used to focus and reflect the beam; a second optical structure comprising a second planar blazed grating and a second ring mirror, wherein the second planar blazed grating is used to compensate for the pulse forward tilt introduced by the first planar blazed grating, and the second ring mirror is used to focus and reflect the beam; and a slit plane, disposed between the first and second optical structures to ensure symmetry, for filtering the beam corresponding to the desired wavelength. This invention solves the technical problem in related technologies where monochromators cannot simultaneously achieve performance indicators such as energy transfer efficiency, spectral resolution, and pulse forward tilt compensation.

This invention discloses a detection system and method for cable fault location, relating to the field of cable fault location technology. It acquires nanosecond-level pulse propagation front-end change trajectory data and echo peak width change data to establish a high-frequency attenuation continuous-time distribution map; extracts pulse broadening growth segments and performs front-end compression control to form a compressed pulse front-end shape; rearranges the peak time position to separate low-amplitude reflection signals; tracks its amplitude trajectory and identifies local insulation anomaly segments by comparing with the peak width evolution trajectory; establishes a distance-back mapping and corrects the echo time coordinates to obtain the fault location interval. This invention improves the ability to identify early insulation defects by constructing a continuous-time distribution map and compressing pulse broadening segments, shortening the peak diffusion time, and separating low-amplitude reflection signals within the peak; simultaneously, it improves fault location accuracy and stability by establishing a distance-back mapping relationship and dynamically correcting the echo time coordinates.

The application discloses a pulse electronic switch based on an enhanced driving and voltage equalization network, which comprises an H-bridge driving circuit, the H-bridge driving circuit is connected with primary windings of a plurality of magnetic isolation modules; the secondary windings of the magnetic isolation modules are respectively connected with corresponding driving waveform optimization circuits; the driving waveform optimization circuits are connected with gates of series power MOSFETs; a voltage equalization network is connected in parallel between the drains and the sources of the series power MOSFETs; the steps of the design method are as follows: step one, the control chip driving signal is amplified to 200V / 12A through the H-bridge power circuit; step two, the isolation driving is realized by using a through primary winding and a plurality of secondary windings; step three, the deviation of the pulse front edge and the pulse trailing edge of the gate driving signal is controlled to be within 10ns by using an analog compensation technology in the post-stage driving waveform optimization circuit; step four, the voltage equalization network composed of the voltage equalization resistors Rm, the RCD buffer circuit and the transient suppression diode is connected in parallel on the series switch link, the dynamic voltage peak of the switch is absorbed, the dynamic and static voltage equalization of the switch is realized, and the dynamic and static voltage unequalization problem can be effectively solved.

The full solid-state parameter adjustable energy recovery excitation source comprises a charging circuit, a main power circuit and a load circuit. The coil current parameters can be flexibly regulated by the working time sequence of each stage switch. The number of discharge modules contained in the full solid-state parameter adjustable energy recovery excitation source is flexibly adjustable, the structure is simple and reliable, the corresponding module number can be matched according to the application requirement, and the cost is reduced. The full solid-state parameter adjustable energy recovery excitation source can feed back the load energy to each stage capacitor through the front-end commutation switch and the energy feedback diode, so that the system energy utilization efficiency is improved. The full solid-state parameter adjustable energy recovery excitation source can break through the limitation that the traditional topology can only adjust the pulse front edge or a single parameter by controlling the input time sequence of each module, and fine and multi-dimensional control of the whole pulse waveform is realized.

The application belongs to the technical field of radio frequency power amplifier overheat protection, in particular to a self-adaptive temperature sensing power amplifier tube protection method and system, wherein the method comprises: establishing a nonlinear time-varying thermal model of the power amplifier tube; before transmitting a pulse, calculating a heat consumption function of heat consumption changing with time according to the pulse input power and the pre-labeled power-heat consumption relationship; collecting the working temperature of the power amplifier tube in real time, and comparing it with the model predicted temperature to obtain a temperature error; correcting the thermal model parameters and the temperature rise function in real time according to the error through an adaptive filter; generating static bias compensation and dynamic baseband pre-distortion signals based on the corrected temperature rise function, and pre-distorting and compensating the input signal. The application overcomes the defects of large error of traditional linear thermal model and open-loop compensation without feedback, realizes high-precision and self-adaptive temperature protection and linearization, and is particularly suitable for magnetic resonance imaging and communication systems.

This invention relates to the field of laser communication technology and discloses a high-precision ranging method and system based on spaceborne laser communication. The method includes: when two terminals send communication signals, aligning the falling edge of the last bit of the frame synchronization header of the data frame with the leading edge of the local satellite clock's integer second pulse as a ranging identifier; modulating the baseband signal containing the ranging identifier into an optical signal and transmitting it into free space; receiving the downlink optical signal from the cooperating terminal and demodulating it into a baseband signal; performing multi-level time delay calibration to obtain the time delay parameters of the system's transceiver channel, and using a code synchronization loop in the communication link to recover the symbol clock phase; and calculating the distance and clock difference between the two terminals based on the arrival time of the ranging identifier and the time delay parameters using a bidirectional one-way ranging model. The above method integrates laser communication and ranging, ensuring high ranging accuracy while saving hardware resources, and is suitable for inter-satellite and satellite-to-ground high-precision laser ranging and high-speed data transmission integration scenarios.

The application provides a high-energy GHz femtosecond pulse train laser amplification system and an amplification method, and solves the technical problem of pulse narrowing effect caused by energy saturation effect in a fiber amplifier during high-energy pulse train amplification; after the pulse train is modulated, the amplitude of the front edge of the modulated pulse is much lower than the back edge, so the pulse train waveform will first experience the change process from exponential rise to gentle rise, then to relatively constant amplitude, and finally gradually evolve into the process of high front and low back and experience pulse narrowing, instead of pulse narrowing effect occurring at the beginning. Therefore, the pulse train modulation delays the occurrence of the pulse narrowing process, effectively suppresses the pulse narrowing effect, reduces the pulse peak power, and thus effectively avoids the accumulation of more nonlinear phase and fiber damage.

This invention relates to a method for generating terahertz radiation and a terahertz radiation source. In the method according to the invention, a pump beam (14) emitted from a pump beam source is incident on a block of a semiconductor nonlinear optical medium (10) having a planar parallel front boundary surface and a rear boundary surface (11, 12), wherein the pump beam (14) is decomposed into a set of sub-pump beams upon refraction on a periodic structure (13) formed by pairs of planar surfaces in the front boundary surface of the block. The sub-pump beams travel in angular directions required to satisfy velocity matching conditions. The envelope of the pump pulse leading edge segment propagating in the sub-pump beam segment propagates in a direction perpendicular to the rear boundary surface (12) (i.e., the exit surface of the optical medium (10)) at the propagation speed of terahertz radiation, and generates terahertz radiation in the semiconductor optical medium (10) by means of optical rectification to satisfy the velocity matching condition; here, is the group velocity of the pump beam (14), is the phase velocity of the generated terahertz radiation, and y is the angle between the envelope of the pulse leading edge of the pump beam (14) and the phase leading edge.