93 results about "Streak camera" patented technology

The invention provides a temporal-spatial resolution radiant flux diagnosis system, which is used for conducting precise diagnosis on the temporal and spatial evolution process of an X-ray radiant flux in a hohlraum. The hohlraum emits X-rays which undergo imaging by means of a pinhole in a pinhole plate, a portion of the X-rays is imaged onto an imaging plate; the other portion of the X-ray passes through a slit I in the imaging plate and then passes through a slit II in a time resolution plate to irradiate on an X-ray photocathode, further passes through a streak camera focusing deflection system and is recorded in a streak camera. According to the recorded signal, the temporal and spatial evolution process of the X-ray radiant flux emitted at a specified position of the hohlraum can be obtained. The temporal-spatial resolution radiant flux diagnosis system has time resolution with picosecond magnitude and temporal resolution with dozens of micrometer magnitude, and has wide application prospect.

The invention discloses a chirped pulse velocity interferometer. In the chirped pulse velocity interferometer, broadband laser pulses output by a broadband pulse laser light source are changed into linear polarization linear chirped pulses after passing through a polarizer and a pulse stretcher; polarization light S and polarization light P which are perpendicular in polarization direction are produced after the linear chirped pulses pass through a polarization splitting prism, and then the polarization light S and the polarization light P are successively emitted into the surface of a tested sample; the beat-wave interferometry is conducted on reflected light at a certain included angle, and produced beat-wave interferometric fringes are recorded through an imaging type spectrometer. A certain delay time difference exists before the polarization light S and the polarization light P are emitted into the surface of the sample, and synchronous transmission is achieved through optical path compensation after the polarization light S and the polarization light P are reflected by the surface of the sample. The oscillation penetrating direction of the polarizer is perpendicular to that of an analyzer. By means of the chirped pulse velocity interferometer, the time distinguishing of sub-picosecond scale can be achieved, the imaging type spectrometer serves as the corresponding recording system, an expensive streak camera recording system is avoided, and therefore the cost of a test system is effectively controlled.

A fast scanning voltage ramp generator including at least one chain of N two-pole avalanche transistors in series and a set of N+1 zener diodes in series between a high voltage power supply and ground, where N is an integer number.gtoreq.2. A streak camera can utilize this type of generator.

The invention discloses a spatiotemporal measurement device for ultrafast laser fields, including an imaging system, a synchronization system, and a data acquisition and processing system. The invention combines the advantages of a stripe camera and a compressed sensing theory in two-dimensional compression imaging, forms dynamic scenes of the captured two-dimensional laser fields by directly illuminating the spots of the laser fields on a paper screen, and reconstructs the obtained compressed data by a second iterative threshold compression algorithm to finally realize the spatiotemporal measurement of any laser field. In the invention, the laser fields to be measured enters a convex lens orderly through a high-reflection mirror, a thin paper screen, an objective lens, and a cube beam splitter, and then reaches a digital micro-mirror device; the reflected light enters the stripe camera after reaching the cube beam splitter again; and a computer controls the collection of image information and post-processing of data. The spatiotemporal measurement device provided by the invention has an entire measurement process as an ultra-fast process of single measurement, with no reference light needed in the measurement, and has the characteristics of simple optical path, fast operation speed of the algorithm, and wide coverage band.

The invention relates to co-target X ray space time resolution spectrum method and its instrument. The optical system of the instrument includes two elliptical crystal analyzer and an upper and subjacent channel thin gaps, their position relation accords with the theory of geometry optical of ellipse focus. The method is: the target is placed at the first focus of the ellipse, the thin gap is a the second focus of the ellipse, the spectrum detector is behind of the thin gap, uses the two elliptical crystal analyzers superposed on the first focus to carry on spectrum, the plasma X ray generated by the laser by striking the target penetrates the thin gap and is imaged by the X ray CCD camera and stripe camera after through the elliptical crystal analyzer spectrum, the X ray CCD camera takes the space resolution spectrum, the X ray stripe camera takes the time resolution spectrum. The invention can acquires the space and time resolution spectrums at the same time, and the receiving efficiency and spectrum resolution are upgraded.

A device to analyze or reconstruct one or more signals Ij coming from one or more light sources, comprises: means to separate the signals Ij into at least two signals Ij1 and Ij2, at least two channels V1, V2 respectively possessing a gain G1, G2 and a dynamic range D1, D2, said channels having at least one sensor and being adapted to obtain, at output, a signal I'j1, I'j2 with amplitudes Aj1(t), Aj2(t), a device for the processing of the signals I'j1, I'j2 adapted to memorizing the amplitude Aj1(t), Aj2(t) of at least one of the two signals I'j1, I'j2 when I'j1 and / or I'j2 is below a threshold value Smax and to determining the amplitude Aj(t) of the corresponding signal I'j. Streak camera with wide range of amplitude.

The invention discloses a sequential diagnosis system used for nanosecond and picosecond laser beam combined targeting, and is used for sequential precision diagnosis in combined targeting by using nanosecond laser beams and picosecond laser beams simultaneously in a laser plasma experiment. The sequential diagnosis system comprises an imaging slit plate, a hard X-ray shielding body, a photocathode slit plate, a photocathode and a streak camera which are arranged in turn along a horizontal direction. In the experiment, soft X-rays generated by nanosecond laser beam targeting are imaged through the slit plate and then irradiated to the partial area of the photocathode; and hard X-rays generated by picosecond laser beam targeting directly penetrate through the slit plate (without imaging) and then irradiate all the area of the photocathode. Two types of X-rays of which the original light source positions are overlapped can be spatially separated on the images recorded by the streak camera so that diagnosis of the sequential relationship between the nanosecond laser beams and the picosecond laser beams can be realized. The sequential diagnosis system has ten picosecond level time discrimination and also has certain soft X-ray spatial discrimination so as to have wide application prospect.

The invention belongs to the field of ultrafast diagnosis, and particularly relates to a terahertz-driven sub-femtosecond time-resolved streak camera. The camera comprises a femtosecond laser device, a beam splitter, an ultraviolet laser pulse generation device, an electronic gun, a magnetic focusing device, a deflection system, a fluorescent screen and an EBCCD camera; after femtosecond laser emitted by the femtosecond laser device passes through the beam splitter, one femtosecond laser beam enters the ultraviolet laser pulse generation device, and the other femtosecond laser beam enters the deflection system; the electronic gun is used for converting ultraviolet laser pulses generated by the ultraviolet laser pulse generation device into electronic pulses and accelerating the electronic pulses; the magnetic focusing device is installed between the electronic gun and the deflection system; the EBCCD camera is installed at the position, directly facing the fluorescent screen, outside a main vacuum chamber. According to the streak camera, the time characteristics of the non-relativistic and relativistic ultrafast electronic pulses can be detected, and the resolution can reach the magnitude of a few femtoseconds.

The invention provides an all-optical solid streak camera which solves the technical problem that large measurable dynamic range and measurable time span are difficult to realize simultaneously in the prior art. The picosecond all-optical solid streak camera with large dynamic range comprises an optical coupling system, an optical deflector and a pump light system and a reading system, wherein the optical deflector comprises an optical waveguide, and if pump light goes into the optical waveguide along vertical direction, then signal light passes through the optical waveguide along horizontal direction and is collected and read by the reading system. A functional layer of the light waveguide is an AlGaAs / GaAs / AlGaAs sandwich structure, the middle core layer is a signal light channel, and a saw-toothed pump light mask used for processing the pump light to form a light prism array in the core layer is arranged on the pump light incidence end face of the covering layer. The invention breaks through the traditional image converter tube streak camera technology based on photoelectric conversion. Meanwhile, an important scientific basis and theoretical basis is also provided for developing and pluralizing the all-optical solid streak camera technology.

The invention provides an implosion double-flow-line diagnosis system which is used for measuring tracks of the inner interface and the ablation surface of a target ball shell in the study of radiation driven implosion. The diagnosis system comprises a backlight source, a prepositioned filter disc, a two-channel X-ray microscope, a two-channel filter disc and an X-ray streak camera. After X-rays generated by the backlight source penetrate through an object to be measured and pass through the prepositioned filter disc, band-pas imaging is conducted on the X-rays through the two-channel X-ray microscope, the X-rays are filtered through the two-channel filter disc, and finally the X-rays are imaged onto the X-ray streak camera. In the implosion double-flow-line diagnosis system, the X-ray microscope and the two-channel filter disc have energy spectrum selected features, and through specific combination together with emission energy spectrum features of the backlight source, implosion double-flow-line images of the moving track of the target ball inner interface and the moving track of a target ball ablation layer can be obtained at the same time.

The invention provides a high-power light-emitting diode (LED) impulse adjustable stroboflash device, comprising a display and input unit, an impulse generation unit, a drive and amplification unit and an LED luminescent unit. A liquid crystal display (LCD) and keyboard input unit inputs impulse width, impulse interval and trigger delay, field programmable gate array (FPGA) is used for designing a synchronous impulse generation circuit, and a high-power LED is used as a lighting source, wherein the LCD and keyboard input unit sets impulse width, impulse interval, trigger time and duty cycle, sets information and sends the information to the impulse generation circuit; the impulse generation circuit generates corresponding impulse according to the set impulse information to the LED drive and amplification circuit so as to perform LED flash. The device controls the LED to flash by adopting synchronous trigger technology, and triggers a high-speed camera, a streak camera and other camera devices to start a shutter for capturing instant information. The LED lamp is in a closed sate when no trigger impulse is generated so as to realize energy conservation and environmental protection.

The invention provides a transmission grating spectrometer with high spectral resolution and a wide spectrum measurement range. The transmission grating spectrometer comprises an incident slit, a transmission grating, a streak camera, and a photocathode slit and a photocathode which match the streak camera. X ray emitted by an object passes through the incident slit and is dispersed by the transmission grating to form two spectra different in resolution, the two spectra are dislocated in space, redundant spectrum is blocked when the two spectra pass through the photocathode slit in front of the streak camera, and therefore, X-ray spectra of high space-time resolution and wide range can be obtained on the streak camera. The transmission grating spectrometer of the invention can achieve higher spectral resolution on the basis of ensuring the measured spectral range, is applicable to time-resolved spectrum measurement, and has a wide application prospect in X-ray spectrum precision measurement.

The invention relates to a lens defect detection method based on stripe deflection. The method comprises the steps that a lens is placed above a screen, and a camera performs shooting above the lens;a shot image is utilized to make the screen display all white, and extraction of a region of interest in the lens is extracted through threshold segmentation; the screen is utilized to project sine stripes, and the camera takes a picture of the stripes refracted by a tested lens by aid of a telecentric lens; and defect recognition is performed in the region of interest, phase calculation is performed through a three-step phase shift method to acquire phase information, whether a phase jump exists or not is judged through calculation, and defect recognition and positioning are realized.

The invention discloses a multifunctional laser fusion diagnostic interferometer, which comprises a lighting lens, a beam splitter 1, a beam splitter 2, an imaging lens 1, an imaging lens 2, an imaging lens 3, a streak camera 1, a streak camera 2, a streak camera 3, an optical circulator module, a probe optical image transmitting module, an interference module 1 and an interference module 2. The multifunctional laser fusion diagnostic interferometer provided by the invention has the advantages of novel structure and easy implementation, can share a light receiving optical path of a traditional linear VISAR, reserves an interference measurement shock wave velocity module of the traditional linear VISAR, fully utilizes probe laser by means of an improved optical path, tracks probe light absorption intensity and shock wave interference verification while acquiring interference beat frequency to calculate a shock wave surface velocity, cooperates with the appropriate image processing means, can acquire more pieces of state-of-matter information, and is conductive to carry out further state-of-matter diagnostic research.

The invention provides an ultrahigh-speed compression photographing device based on compression perception and streak camera principles. The device comprises a lens, a beam splitter, a spatial light modulator, a flat mirror, a streak camera with a built-in CCD, and a decoder. Firstly, captured image information is coded through the spatial light modulator. Then the streak camera is utilized for superposing image information at different time points and performing compression sampling. Finally reconstruction is performed on the image based on a compression perception principle. According to the device, two-dimensional imaging can be performed on an ultrafast process on the condition of definite imaging speed of the streak camera; the image information is output to a decoder; a two-dimensional image dynamic process (x-y-t) is reconstructed through a TwIST algorithm; and the imaging speed can reach 10-12 frame / second. The ultrahigh-speed compression photographing device utilizes single-time photographing measuring technology which can measure un-repeated ultrafast events.

The invention provides a synchronous scanning streak camera temporal resolution measuring device and method, and aims at solving the problem that the confidence coefficient of a conventional testing method is low. The synchronous scanning streak camera temporal resolution measuring device comprises a femto second laser device, a first spectroscope, a fast recovery diode, a beam expanding lens, a second spectroscope, a first reflector, a second reflector and a length-measuring interferometer. The first spectroscope is arranged on the output light path of the femto second laser device, the fast recovery diode is arranged on the transmission light path of the first spectroscope, the beam expanding lens is arranged on the reflection light path of the first spectroscope, the second spectroscope is arranged on the output light path of the beam expanding lens, the first reflector is arranged on the transmission light path of the second spectroscope, the second reflector is arranged on the reflection light path of the second spectroscope, the length-measuring interferometer is arranged right behind the second reflector and used for measuring the moving distance of the second reflector in the light path direction of the second reflector, and the second reflector is a double-faced reflector. According to the invention, high-precision measurement of the resolution of a high-temporal resolution synchronous scanning streak camera is achieved.

The invention provides a transmission-type X-ray photoelectric cathode which comprises a cathode base layer, a connection layer and an emitter layer. The emitter layer is composed of two metal layers, wherein a plurality of micropores are evenly distributed in the thick metal layer. According to the transmission-type X-ray photoelectric cathode, an emitter has the identical energy response strength at all energy points within the 100 eV-5000 eV energy range. The transmission-type X-ray photoelectric cathode is applied to detectors such as streak cameras which have high space-time resolving power, and the high space-time resolution quantification measurement of the strength of an unknown X-ray radiation source can be achieved.

The invention discloses a three-dimensional measurement system for matter state information of a laser fusion target capsule, and the system comprises an experimental target and a diagnosis optical path. The experimental target comprises a spherical target capsule and a three-dimensional mirror surface disposed at the center of the spherical target capsule. The diagnosis optical path comprises at least two parallel refit linear VISAR systems, and each refit linear VISAR system comprises a system light splitter and two groups of etalon interference systems disposed at the rear end of the system light splitter. Detection laser reflected by the three-dimensional mirror surface is divided by each system light splitter into two different branches which respectively enter the corresponding two groups of etalon interference systems, and then is divided into two interference branches through the system light splitter and reflectors with etalons. Each interference branch passes through a Dove prism to be converted and then is imaged through a streak camera. Through designing a front-end detection device for the spherical target capsule and refitting a conventional linear imaging VISAR system, the system can achieve the VISAR measurement of the speed of an impact wave at any angle in a three-dimensional space of the internal surface of the spherical target capsule, such as the matter state information.

The invention discloses a four-sensitivity laser fusion shock wave speed measurement interferometer comprising an imaging module, a first image transmitting module and a second image transmitting module; the imaging module divides doppler signal reflected light reflected by a target surface into two beams, wherein one doppler signal reflected light beam forms two coherent light beams through the first image transmitting module and respectively form an image on a streak camera 1 slit, and the other doppler signal reflected light beam forms two coherent light beams through the second image transmitting module and respectively form an image on a streak camera 2 slit. The four-sensitivity laser fusion shock wave speed measurement interferometer is novel in structure, smart in concept, small in application difficulties, low in cost, and is reconstructed through existing equipment, thus greatly reducing real shock wave speed solving difficulty.

The invention provides a calibration system for deflecting direction of a streak tube and a cathode surface. The calibration system for the deflecting direction of the streak tube and the cathode surface comprises a deflecting direction calibration system and a cathode surface calibration system. A fixing guide rail of the deflecting direction calibration system is arranged on a first optical table. A parallel optical tube, a calibrated streak tube and a CCD are arranged on corresponding sliding blocks of the fixing guide line. The CCD and a displayer collect and display a final image of the cathode surface of the streak tube. A second optical table of the cathode surface calibration system is provided with a light through hole, and a horizontal plane reflecting mirror is arranged on the second optical table and directly faces the light through hole. A laser light source is arranged below the second optical table, and an adjustable plane reflecting mirror is arranged below the second optical table and directly receives a laser reflected by the horizontal plane reflecting mirror. A receiving screen receives the laser reflected by the adjustable plane reflecting mirror. The encapsulation accuracy of the streak tube and the efficiency of the whole machine integration of a streak camera are improved, and the calibration system for deflecting direction of the streak tube and the cathode surface is beneficial to the advancement of the industrialization of the streak camera.

The invention discloses a laser implosion diagnosis system. The laser implosion diagnosis system comprises a filter disc, a dual-channel X-ray imaging system and a dual-channel X-ray streak camera. The dual-channel X-ray streak camera comprises a dual-channel X-ray scanning image conversion tube, an optical fiber, an image intensifier and an image recording system. The dual-channel X-ray scanningimage conversion tube comprises multiple groups of electronic focusing systems and scanning deflection electrodes, and can detect double scanning speeds of X-rays. The whole process of pellet compression in a laser implosion physical experiment is measured by a low-scanning-speed channel, and the pellet focused center implosion process is measured by a high-scanning-speed channel. The laser implosion diagnosis system is compact in structure and large in dynamic range, can measure the whole process of pellet compression in the laser implosion physical experiment and can also conduct high time resolution measurement on the pellet focused center implosion process which needs to be studied carefully, and has broad application prospects in the laser inertial confinement fusion implosion physicexperiment study.

A pump-probe scheme measures the rise time of ultrafast x-ray pulses. Conventional high speed x-ray diagnostics (x-ray streak cameras, PIN diodes, diamond PCD devices) do not provide sufficient time resolution to resolve rise times of x-ray pulses on the order of 50 fs or less as they are being produced by modern fast x-ray sources. Here, we are describing a pump-probe technique that can be employed to measure events where detector resolution is insufficient to resolve the event. The scheme utilizes a diamond plate as an x-ray transducer and a p-polarized probe beam.

The invention discloses a four-dimensional ultra-fast photographing device comprising a data acquisition system, a data reconstruction system and a synchronization system. The invention acquires an integral image, which is the image after compressing the entire ultra-fast dynamic process, from a dynamic scene to be measured through the data acquisition system, the data reconstruction system processes the image from the data acquisition system, that is, denoising and the augmented Lagrangian algorithm are used to reconstruct the dynamic scene to be measured, and images recording four-dimensional scenes of the space x-y, time t and spectrum lambda of the object are finally obtained. The invention uses a synchronization system to control the working time of the fringe camera, enables a breakthrough and expansion of the existing optical imaging technology and realizes the measurement of four-dimensional dynamic scenes, and has certain application value in fluorescence measurement and diagnosis of biological tissues.

The invention discloses a preparation method of a photocathode of a streak camera. Firstly, a nano-scale columnar microstructure array is fabricated on the surface of a polished silicon wafer by physical vapor deposition and dry etching with porous anodic alumina as a template. Then, microporous organic thin film is prepared by using the columnar microstructure array as a template. The organic thin film was transferred to a photocathode support as the supporting substrate, and a conductive layer and a photoemission layer are deposited on the organic thin film by physical vapor deposition. Finally, the streak camera photocathode with the nano-scale microporous array on the surface is fabricated. The method realizes the fabrication of the photocathode of the streak camera with the nano-scalemicroporous array structure, which can greatly improve the spectral response sensitivity of the photocathode, and has a wide spectral response range, and can carry out the spectral response from ultraviolet light to hard X-ray, and is suitable for the application of the streak camera with high spatial resolution. The method also has the advantages of simple technological process and low cost.

The invention discloses a high time resolution optical imaging system based on an optical fiber image transmitting bundle. The system comprises an optical fiber image transmitting bundle assembly, an optical streak camera, an incident imaging lens and an emergent imaging lens. The optical fiber image transmitting bundle assembly is located between the incident imaging lens and the emergent imaging lens. The emergent imaging lens is located between the optical fiber image transmitting bundle assembly and the optical streak camera. The optical fiber image transmitting beam assembly comprises an incident end head, an emergent end head and m groups of optical fiber bundles. Lengths of the groups of optical fiber bundles are different. Incident ends of fiber cores of each group of optical fiber bundles are uniformly distributed on an end surface of the incident end head in a one-dimensional or two-dimensional mode. Emergent ends of the fiber cores of each group of optical fiber bundles are uniformly distributed on an end surface of the emergent end head in a one-dimensional mode. By using the high time resolution optical imaging system based on the optical fiber image transmitting bundle, the structure is novel and is easy to realize; a high time resolution and a high two-dimensional space distinguishing capability are possessed; and simultaneously the whole system possesses a large detection area and a suitable range is wide.

The invention discloses a test method and device for impacting a space debris protective structure with a laser driving ball. The test method includes the steps that a target structure of the ball isdetermined; the initial state of the ball during operation is determined; a laser test is conducted, so that the diameter of a critical ball leading to a failure of the protective structure is obtained; the test device comprises the ball, a laser emitter, the target structure, the protective structure, a streak camera and a framing camera. According to the test method and device, operation is simple, a designed laser ablation driving ball target device realizes high-precision measurement and diagnosis during testing, a technical means is provided for a super-high speed impact test for the space debris protective structure larger than or equal to 10 km / s, and the engineering demand for a spacecraft space debris protective design is met.

An electronic streak camera is described which includes a housing enclosing an objective lens disposed along an optical axis for forming an image of optical radiation from an emissive body, a pinhole field stop at the focal point of the objective lens, a collimating lens for collimating radiation passing the pinhole field stop, a prism for splitting the radiation from the collimating lens into a characteristic optical spectrum of the radiation, an imaging lens for forming an image of the radiation from the prism.

This invention relates to a fast scanning voltage ramp generator comprising at least one chain of N two-pole avalanche transistors in series (T1-T8; T11-T18) and a set of N+1 zener diodes (D1-D9) in series between a high voltage power supply (HV) and the ground, where N is an integer number >=2. This invention also relates to a streak camera using this type of generator.

The invention relates to an ultrafast diagnosis technology, in particular to a full terahertz driven electron beam manipulation and characterization system and method to solve the problems that an existing streak camera is low in time resolution, complex in structure and poor in stability. The technical scheme adopted by the invention is as follows: the full-terahertz-driven electron beam controland characterization system comprises a femtosecond laser, an ultraviolet laser pulse generation device, a first reflector, a beam splitter, a single-cycle terahertz generation device, a second reflector, a multi-cycle terahertz generation device, a camera, a vacuum chamber and a direct-current acceleration system, wherein the direct-current acceleration system is sequentially arranged in the vacuum chamber along a light path; the device comprises a perforated off-axis parabolic mirror, a terahertz electron beam control system, a terahertz deflection system and a fluorescent screen. The invention also provides a full terahertz driven electron beam manipulation and characterization method.

An embodiment of the invention provides a time characteristic measuring device and system. The device comprises a synchronous controller, a laser, an optical fiber array and a computing device. The synchronous controller is used for controlling working states of the laser and a streak camera through two paths of pulse signals. The laser is used for outputting pulse laser according to control of the synchronous controller. The optical fiber array comprises a plurality of fibers in different lengths. The optical fiber array is used for transmitting the pulse laser. The pulse laser output by thelaser irradiates to the streak camera through the optical fiber array. The streak camera is used for obtaining a scanned image, wherein the scanned image comprises laser points formed by the pulse laser. The computing device is used for calculating the time characteristic of the streak camera according to the distance between two laser points in the scanned image in the horizontal direction and the length difference between the corresponding two fibers. Therefore, the device and system can measure the time characteristic of the streak camera.