40 results about "Pulse radiation" patented technology

A device and method for spatially resolved photodetection and demodulation of temporally modulated electromagnetic waves makes it possible to measure phase, amplitude and offset of a temporally modulated, spatially coded radiation field. A micro-optical element (41) spatially averages a portion (30) of the scene and equally distributes the averaged intensity on two photo sites (51.1.51.2) close to each other. Adjacent to each of these photo sites (51.1) are two storage areas (54.1, 54.2) into which charge from the photo site can be moved quickly (with a speed of several MHz to several tens or even hundreds of MHz) and accumulated essentially free of noise. This is possible by employing the charge-coupled device (CCD) principle. The device combines a high optical fill factor, insensitivity to offset errors, high sensitivity even with little light, simultaneous data acquisition, small pixel size, and maximum efficiency in use of available signal photons for sinusoidal as well as pulsed radiation signals. The device and method may be used in a time-of-flight (TOF) range imaging system without moving parts, offering 2D or 3D range data.

The invention relates to a radar sensor (10) for use with automobiles. Said radar sensor emits pulsed radiation. The radar sensor is characterized in that it comprises an antenna with at least one layer-structured block (34) consisting of metal layers (36, 38, 40, 42) which are arranged according to the Yagi principle and which are respectively separated from each other by a dielectric intermediary layer (46, 48, 50). At least one of the metal layers (36, 38, 40, 42) is excited by a supply system (18) with a radar frequency.

The photoacoustic detection chamber (6) is located in the optical cavity (3) of the cavity-enhanced absorption spectroscopy device (3, 4, 5). When the sample in the chamber (6) absorbs radiation from the pulsed radiation beam coupled into the cavity (3), pressure waves detected by the microphone (9) are generated. The detection signal (10) output by the microphone (9) can be processed to determine the concentration value of the absorbing material in the sample.

A method is described of radiatively cutting a wafer, the method comprising the steps of low power cutting of two trenches followed by high power cutting of a fissure. A single pulsed radiation beam is split into a first pulsed radiation beam for cutting at least one of the trenches and a second pulsed radiation beam for cutting the fissure. When cutting a fissure on the wafer in a cutting direction along a cutting street, the first and second radiation beams are directed simultaneously with the first radiation beam leading and the second radiation beam trailing. For cutting a fissure in the opposite cutting direction, a third pulsed radiation beam for trenching is split from said single pulsed radiation beam.

The invention discloses an electromagnetic pulse radiation field test probe, a test system and a test method. The probe comprises an electrically small monopole antenna, a metal shielding shell and anelectro-optical conversion circuit; one end of the electrically small monopole antenna is positioned outside the metal shielding shell; the other end of the electrically small monopole antenna penetrates through an antenna lead-in hole in the metal shielding shell and then enters the metal shielding shell; and the end part of the electrically small monopole antenna entering the metal shielding shell is electrically connected with the signal input end of the electro-optical conversion circuit; and the signal output end of the electro-optical conversion circuit is the optical signal output endof the test probe. The probe has the advantages of wide working frequency range, large dynamic range, adjustable sensitivity, simple circuit structure, easiness in miniaturization and the like.

A laser processing method for performing laser ablation process on a work piece by radiating laser beam on the work piece includes the step of forming simultaneously a plurality of process shapes arranged at a predetermined interval by use of laser beam of plural pulses having extremely large spatial and temporal energy density radiated from a laser oscillator as the laser beam oscillating at the pulse radiation time of one picosecond or less. With the laser processing method thus structured, it is possible to perform a highly precise processing without creating by-product, as well as to fundamentally prevent the converted thermal energy from being accumulated on a work piece, such as resin, which causes the work piece to be fused or thermally expanded during the operation of laser processing.

The invention belongs to the field of pulse radiation detection, and particularly relates to an X-ray radiation field detecting device and an X-ray radiation field detecting method based on a semiconductor laser device. The detecting device comprises a radiation detector and laser power measuring and recording equipment. The radiation detector is in optical path connection with the laser power measuring and recording equipment through an optical fiber or a laser focusing and transmitting device. The radiation detector comprises the semiconductor laser device and an external power supply for supplying pre-bias current to the semiconductor laser. The current which is supplied by the external power supply is larger than or equal with the threshold current of the semiconductor laser. The X-ray radiation field detecting device performs direct modulation on active-region carriers of the semiconductor layer by means of X-ray, thereby realizing disturbance on output power of the semiconductor laser. X-ray pulse information is finally acquired through measuring change of an output laser signal. The X-ray radiation field detecting device based on the X-ray radiation field detecting method has advantages of simple structure, low cost, ultra-short response time, etc. Furthermore laser is used as a signal characteristic.

The invention relates to a silicon-ytterbium-ion-codoped YAG superfast scintillating crystal and a preparation method thereof. The chemical formula of the silicon-ytterbium-ion-codoped YAG crystal is Yb3xY3(1-x)Si5yAl5(1-y)O12, wherein x=0.05-0.3, y=0.0001-0.01, x is the doping amount of matrix Yb ions, y is the doping amount of Si ions, the Yb ions enter the crystal to replace Y ion sites, and the Si ions replace Al ion sites. The Yb3xY3(1-x)Si5yAl5(1-y)O12 superfast scintillating crystal prepared by the method is high in light yield, high in irradiation damage resistance, applicable to fields such as superfast pulse radiation detection, inertia confined fusion, space radiation detection and nuclear reaction kinetics researches, and the like.

The invention discloses a pulsed DC testing system and method of a GaN HEMT microwave power device. A vector network analyzer is used for testing the S parameter of the GaN HEMT microwave power device, or a semiconductor analyzer is used for testing the pulse direct current characteristic of the GaN HEMT microwave power device. The two output ends of the vector network analyzer or the semiconductor analyzer respectively load pulse radiation frequency signals to the grid electrode and the drain electrode of a tested GaN HEMT device through a Bias Tee. Two DC power supplies with different voltage grades are respectively loaded on two Bias Tees through two groups of switches. According to the pulsed DC testing system and method of the GaN HEMT microwave power device, when the GaN HEMT microwave power device is tested, pulse DC voltages are used, two groups of switch circuits control the DC power supplies applied on the Bias Tees to be connected, and the automatic heating phenomenon of the GaN HEMT and the performance deterioration of the microwave power device caused by continuously applying of the DC voltages on the GaN HEMT are avoided.

Solar simulator that includes a pulsed radiation source for generating electromagnetic radiation, and at least one mirror element is arranged in a region of the radiation source. The at least one mirror element is structured and arranged to reflect components of radiation from the radiation source essentially in an intended irradiation direction. Further, the at least one mirror element, formed at least in part of metal, is positioned adjacent to the radiation source and is structured to receive at least a part of an ignition voltage of the pulsed radiation source. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

A radiation detector formed using silicon-on-insulator technology. The radiation detector includes a silicon layer formed on an insulating substrate, wherein the silicon layer includes a PNPN structure, and a gate layer formed over the PNPN structure, wherein the gate layer includes a PN gate. Latch-up occurs in the radiation detector only in response to incident radiation.

The invention belongs to the technical field of strong electromagnetic pulse protection, and particularly relates to a radio frequency front-end electromagnetic pulse protection module which is suitable for satellite navigation positioning communication equipment. The protection module is used for carrying out strong electromagnetic pulse protection on the satellite navigation positioning communication equipment. The protection module comprises a first transient suppression circuit, a band elimination filter, a second transient suppression circuit and a shielding shell. Compared with the priorart, by using the protection module provided by the invention, problems of low bearing power and a low response speed of an existing radio frequency front-end protection module can be solved; and a power bearing capacity of the protection module is improved to a 10KW level, and the response time is reduced to be within 1ns so that effective protection of the radio frequency front end of the satellite navigation positioning communication equipment under an electromagnetic pulse radiation field is realized.

The invention discloses an ultrahigh frequency electromagnetic pulse sensor characteristic calibration method and system, and belongs to the technical field of sensor characteristic calibration. According to the ultrahigh-frequency electromagnetic pulse sensor characteristic calibration method based on the single-cone antenna, a mirror single-cone calibration system is formed by constructing a high-power subnanosecond leading-edge pulse source and the mirror single-cone antenna, the high-power subnanosecond leading-edge pulse source is an all-solid-state pulse source based on an avalanche transistor, and the mirror single-cone antenna is an all-solid-state pulse source based on an avalanche transistor. The ultrahigh-frequency electromagnetic pulse sensor calibration device can be used for realizing calibration of an ultrahigh-frequency electromagnetic pulse sensor, so that the leading edge of an output pulse reaches a hundred ps magnitude and the peak voltage reaches a kV magnitude, a high-field-intensity subnanosecond electromagnetic pulse standard field environment can be generated, and calibration of a high-amplitude fast-leading-edge ultrahigh-frequency electromagnetic pulse sensor can be realized. Therefore, the GIS comprehensive pulse radiation environment measurement level is greatly improved, the calibration problem of the high-amplitude fast-leading-edge ultrahigh-frequency electromagnetic pulse measurement sensor is solved, and the scheme is simple, practical, feasible and convenient to implement.

The present invention discloses a method and a device for measuring short pulse ionizing radiation. The method comprises the following steps: pulsed X-ray is controlled to irradiate a diamond detectorto generate electron hole pairs in order to generate electric current; the electric current is controlled to enter a pre-integrated circuit, and an electrical signal is pre-integrated and measured through a current measuring circuit; the measured electrical signal is collected and converted by a data acquisition circuit, and the ionizing radiation dose of a short pulse radiation field therein isobtained. By using the method, the ionizing radiation of the short pulse radiation field can be measured in real time, thereby operation risk is reduced and health of operators is ensured.