14 results about "Pulse radiation" patented technology

The invention discloses a magnetic anisotropy quantitative method and system for detecting terahertz signals based on a rotating magnetic field, and the method comprises the steps: (1), obtaining a to-be-detected magnetic / non-magnetic material film which comprises at least one non-magnetic film layer with strong spin-charge flow conversion and at least one magnetic film layer; (2) transmitting femtosecond laser pumping pulse to the magnetic / non-magnetic material film to be detected, and radiating terahertz waves; (3) applying a magnetic field to the magnetic / non-magnetic material film to be tested; (4) setting the relative time delay of the femtosecond laser detection pulse and the femtosecond laser pumping pulse to the signal position of the terahertz wave, continuously rotating the angle of applying the magnetic field, and detecting terahertz wave signals at different magnetic field angles through the femtosecond laser detection pulse; and (5) calculating to obtain the magnetic anisotropy field of the magnetic thin film layer according to the terahertz wave signals under different magnetic field angles. The method does not need to contact a sample for measurement, does not need to carry out micro-nano processing on a detection material, is simple in preparation and test processes, and can realize nondestructive detection.

The invention relates to an accurate photodetector measurement for LIDAR. A light ranging system may include a laser device and an imaging device having a light sensor. A laser device irradiates a scene with laser pulsed radiation that is reflected from an object in the scene. The reflection may vary greatly depending on the reflective surface shape and reflectivity. The signals measured by the light sensor may be filtered with several matched filters designed according to the curves of different reflected signals. The best matched filter can be identified, and thus information about the reflective surface and accurate ranging information can be obtained. The laser pulse radiation may be emitted in coded pulses by allowing weights of different detection intervals. Other enhancements include interleaving laser pulses and changing the operating state of a photodetector of a pixel sensor, as well as efficient signal processing using a sensor chip including processing circuitry and a photosensor.

The invention discloses a multiphase isolation power supply circuit, which relates to the technical field of electronics and comprises a signal transmitting circuit, a signal-power conversion circuit, an isolation power supply transmission and shaping circuit and a power supply voltage stabilizing circuit. In order to solve the problem of an isolated power supply of a three-way single-phase metering chip in a direct sampling scheme of a manganin diverter, the invention provides a circuit structure which sends a signal through a master control MCU and simultaneously provides a power supply for the three-way single-phase metering chip, and the circuit structure is simple and reliable and can pass various strict tests such as surge, group pulse, radiation, conduction and the like; the circuit not only can be used for a three-phase electric energy meter, but also can be used for a single-phase electric energy meter adopting double-shunt sampling, or other application occasions needing to supply power to a plurality of isolated power supply domains.

The application provides a pulse radiator, relates to the field of microwave radio frequency technology, and comprises a radio frequency multistage amplification link and a measurement and control communication component; the radio frequency multistage amplification link generates an output pulse signal; the measurement and control communication component performs real-time monitoring and regulation on the output pulse signal, and is configured with a self-adaptive degradation fault prevention shutdown control strategy. In a continuous radiation working mode, operating state parameters are continuously acquired; when the operating state parameters reach a preset warning limit, the self-adaptive degradation control is triggered, a dynamic attenuation control code is issued to reduce the output gain to enter a degradation working mode; during the degradation working mode, the parameter development trend is continuously monitored; when the parameters recover to a safe interval, the dynamic attenuation control code is reversely adjusted to smoothly recover the output gain to the initial setting state. The application prevents hard power-off shutdown of the equipment caused by abnormal working conditions, and maintains continuous radiation of the signal.

It is provided a method for generating a supercontinuum, the method comprising the following steps: a) radiating a carrier laser pulse having a first temporal width onto a first non-linear material; b) at the same time, radiating a second shorter laser pulse having a second temporal width onto the first non-linear material, thereby changing the non-linear properties of the first non-linear material and imprinting a ghost pulse having a third temporal width into the carrier pulse; the second temporal width being at least two times shorter than the first temporal width, and c) radiating the carrier pulse with imprinted ghost pulse onto the first non-linear material or a second non-linear material and generating, by self-phase modulating, a supercontinuum around the center frequency of the carrier pulse.

The invention discloses a radar signal sorting and parameter estimation method and system for extracting split pulse characteristics based on deep learning, and mainly solves the problems that the multi-radiation-source staggered sorting precision under split pulses is low and multi-type signal parameters cannot be estimated in the prior art. According to the implementation scheme, a training set and a test set containing pulse type labels and pulse radiation source labels are generated; constructing a pulse type classifier, and training the pulse type classifier; inputting the test set into a trained pulse type classifier, and performing pulse screening on an output classification result to obtain a screened test set; constructing a radiation source classifier and training the radiation source classifier; inputting the screened test set into a trained radiation source classifier to obtain a sorting result; and estimating the parameters of the screened test set according to the sorting result. According to the method, a good sorting effect and correct estimation of original pulse parameters can be obtained under the split pulse conditions of multi-radiation-source staggering and multi-signal types, and the method can be applied to radar signal sorting reconnaissance in a complex electromagnetic environment.

According to the invention, various desired phase differences between spins of a first spin species and spins of a second spin species are generated by irradiated RF excitation pulses, and corresponding MR data sets are acquired in respective echo paths after irradiation of the RF excitation pulses. This eliminates the need for the previously required extension of echo intervals to generate the different phase differences between the spin species. The disadvantages of the previously necessary extension of the echo interval can thus be avoided with the method according to the invention.

The present invention relates to a pulse radiation detection module and method, and specifically to a method and system for measuring the time spectrum of ultrafast pulsed γ / X-rays with a small beam spot. The method solves the technical problem in the prior art that the detection of ultrafast pulsed γ / X-ray time spectrum cannot simultaneously achieve ultrafast time resolution and sufficient position resolution, making it difficult to achieve the goal of ultrafast pulsed γ / X-ray time spectrum measurement with spatial alignment requirements. The method for measuring the time spectrum of ultrafast pulsed γ / X-rays with a small beam spot includes the following steps: 1) causing the γ / X-ray to be measured to be incident on a scintillator array; 2) measuring the position of the light-emitting scintillators on the scintillator array; 3) aligning the γ / X-ray to be measured with a semiconductor laser diode; 4) exciting the semiconductor laser diode to emit a laser pulse signal to a photoelectric conversion component; 5) the photoelectric conversion component converts the laser pulse signal into an electrical signal and records the signal, thereby achieving the measurement of the time spectrum of the ultrafast pulsed γ / X-ray with a small beam spot.

The invention relates to the technical field of power amplifiers, and particularly discloses a pulse power amplifier and a pulse radiator, the actual heating state of a device is accurately reflected by acquiring the temperature distribution of each stage of power amplifier device in real time and judging the delay of a sensor, and a hot spot determination and temperature prediction identification module is used for determining the temperature of the device. A real hot spot area can be identified, the over-temperature risk can be predicted based on the temperature trend, advanced protection is realized, and the damage probability of a power tube or a synthetic link is reduced; the influence of delay monitoring and environmental disturbance is analyzed based on temperature distribution parameters, and a monitoring hot spot position is verified and determined, so that the accuracy of temperature control and hot spot identification is improved; the pulse radiator associates temperature abnormity with radiation parameter fluctuation, identifies leading influence factors, ensures accurate and stable microwave output, integrally realizes real-time monitoring and prediction protection of temperature abnormity and radiation output, triggers protection actions in advance, and improves operation safety and reliability.

A method includes: providing a plate-like glass element having side faces and an ultrashort pulse laser having a laser beam; directing the laser beam onto one of the side faces; concentrating the laser beam by focusing optics to form an elongated focus in the glass element; producing a filament-shaped flaw in a volume of the glass element by a radiated-in energy of the laser beam, a longitudinal direction of which runs transverse to one of the side faces, and the ultrashort pulse laser radiates in a pulse or a pulse packet having at least two successive laser pulses to produce the filament-shaped flaw; widening the filament-shaped flaw to form a channel by exposing the glass element to an etching including an etching medium which removes glass at a rate of less than 8 μm per hour; and introducing rounded, hemispherical depressions in a wall of the channel by the etching.

The present disclosure relates to accurate light detector measurements for LIDAR. An optical ranging system may include a laser device and an imaging device having a light sensor. The laser device illuminates a scene with laser pulse radiation, which is reflected from objects in the scene. The reflection can vary greatly depending on the shape and reflectivity of the reflecting surface. The signal measured by the light sensor can be filtered using several matched filters designed based on the curves of different reflected signals. The optimal matched filter can be identified, and thus information about the reflecting surface and accurate ranging information can be obtained. The laser pulse radiation can be emitted in decoded pulses by allowing weights for different detection intervals. Other enhancements include interleaving the laser pulses and changing the operating state of the light detectors of the pixel sensor, as well as efficient signal processing using a sensor chip that includes processing circuitry and the light sensor.

The invention relates to an optical sensor according to the time-of-flight principle for detecting objects in a monitored region, having a first transmitter for transmitting first light pulses into the monitored region, a first receiver for detecting first light pulses radiated back by a first object to be detected in the monitored region, a second transmitter for transmitting second light pulses into the monitored region, a second receiver for detecting second light pulses radiated back by the first object or by a further object in the monitored region, a control and evaluation unit which is designed to control the first transmitter and to evaluate the first light pulses detected by the first receiver and to control the second transmitter and to evaluate the second light pulses detected by the second receiver, characterised in that between the first transmitter and the second receiver a first optical reference path is formed, between the second transmitter and the first receiver a second optical reference path is formed, the control and evaluation unit is designed to trigger the first transmitter to transmit first test light pulses which reach the second receiver on the first optical reference path and to activate the second receiver after a first time offset, the first time offset corresponding to a time of flight of the first test light pulses over the first optical reference path, and / or to trigger the second transmitter to transmit second test light pulses which reach the first receiver on the second optical reference path and to activate the first receiver after a second time offset, the second time offset corresponding to a time of flight of the second test light pulses over the second optical reference path, and to evaluate the first test light pulses detected by the second receiver and / or the second test light pulses detected by the first receiver.

The application discloses a folded pulse radiation detector and a method for generating a high-amplitude signal, and solves the technical problem that the existing folded pulse radiation detector is difficult to simultaneously realize high intrinsic resolution and improve the amplitude of the optical signal; the folded pulse radiation detector comprises an n-channel laser for emitting n paths of probe light, and further comprises n sensor structures, n delay adjusters, a fiber combiner and a photodetector; the input ends of the n sensor structures are connected to the output ends of the n-channel laser through optical fibers, and are used for converting the n paths of probe light into n beams of interference light and disturbing the interference light; the n delay adjusters are connected to the n sensor structures respectively, the input end of the fiber combiner is connected to the output ends of the n delay adjusters through optical fibers; and the photodetector is connected to the output end of the fiber combiner. Through the interference signal superposition mode, the amplitude response of the folded pulse radiation detector is improved while the high intrinsic time resolution is maintained.

A light ranging system can include a laser device and an imaging device having photosensors. The laser device illuminates a scene with laser pulse radiation that reflects off of objects in the scene. The reflections can vary greatly depending on the reflecting surface shape and reflectivity. The signal measured by photosensors can be filtered with a number of matched filter designed according to profiles of different reflected signals. A best matched filter can be identified, and hence information about the reflecting surface and accurate ranging information can be obtained. The laser pulse radiation can be emitted in coded pulses by allowing weights to different detection intervals. Other enhancements include staggering laser pulses and changing an operational status of photodetectors of a pixel sensor, as well as efficient signal processing using a sensor chip that includes processing circuits and photosensors.