269 results about "Nanosecond" patented technology

The invention discloses a photoacoustic spectrum-confocal Raman spectrum multi-view-field high-dimensional imaging method and a photoacoustic spectrum-confocal Raman spectrum multi-view-field high-dimensional imaging device. Nanosecond pulse laser with adjustable wavelength is generated through a continuous spectrum nanosecond pulser and a narrow-band spectrum tuning module and cooperates with a microscopic detection module, a depth imaging module, a galvanometer system and an electric displacement table to obtain spatial three-dimensional data, a photoacoustic spectrum and a Raman spectrum under multiple view fields; shallow photoacoustic spectrum-Raman spectrum tomography and deep three-dimensional photoacoustic imaging are realized; correcting a photoacoustic spectrum quantitative error by using a spectrum decoupling algorithm, and fusing the multi-view-field data to generate multi-view-field high-dimensional photoacoustic spectrum-Raman spectrum data; high-dimensional data features are extracted based on a 3D convolution instance segmentation network, and quantitative analysis and spatial distribution visualization of blood oxygen, inflammatory factors and the like are achieved. According to the method, the limitation that substances are difficult to analyze in photoacoustic imaging is overcome, the contradiction between the imaging resolution and the penetration depth is solved, and an accurate analysis means is provided for diagnosis of diseases such as knee osteoarthritis and sepsis.

The invention discloses a high-power fast phase inversion switch based on a p-i-n diode, and relates to the technical field of high-power microwave p-i-n diode phase shifting. The inverter switch comprises a rectangular waveguide, 2N loading linear p-i-n diode phase shift circuits which are symmetrically and uniformly arranged on a narrow-side waveguide wall, and a bias power supply which provides bias voltage for the phase shift circuits. According to the invention, the loading line type p-i-n diode phase shift circuit is inserted into the waveguide structure, so that a microwave signal is transmitted along the waveguide transmission line instead of being transmitted along the metal microstrip line, the influence of the power loss of the p-i-n diode on the insertion loss of the phase shift circuit can be reduced, and the overall insertion loss is reduced; and meanwhile, phase inversion is realized by controlling the bias state of a p-i-n diode in the phase shift circuit, and nanosecond switching speed can be realized.

The invention discloses a nanosecond particle velocity measurement method based on orthogonal line polarization beam splitting, and belongs to the technical field of particle image velocity measurement. The method comprises the following steps: providing two linear polarization state orthogonal double-pulse lasers, and respectively outputting S polarization pulse light beams and P polarization pulse light beams; the four pulse light beams are combined through the double-path laser beam combining mirror set and output to the sheet light mirror set, and a plane illumination jet flow field with the thickness smaller than or equal to 1 mm is formed; scattered light is separated according to a polarization state by using a polarization beam-splitting cubic prism, and particle images under S polarization and P polarization are respectively captured by two double-exposure cameras which are orthogonally arranged; five kinds of time sequence control are triggered through a multi-channel synchronous controller; processing the view field deviation of the two cameras by adopting a block polynomial alignment method; and calculating a particle velocity field based on a particle tracking velocity measurement algorithm. According to the invention, the polarization debugging error is reduced, the homogeneity error after beam combination is obviously reduced, the coincidence degree of the four beams of planar light is improved, and a high-precision universal alignment scheme is provided for the multi-camera PTV technology.

Disclosed is a nanosecond neutron analysis and associated particle imaging system (NNA / API) and gamma ray detector arrangement (arrangement) that uses associative element detection of titanium, iron and oxygen to determine concentrations of ilmenite or other minerals in extra-terrestrial bodies associated with He-3. The arrangement is used with a mobile carrier for mapping out concentrations of likely He-3 regions on the extra-terrestrial body.

The invention provides a device and a method for generating a Lammer-type hot atomic beam light clock based on periodic pulses. The device comprises a pulse laser, a laser frequency stabilization system, an optical switch, a Laammer type hot atom chamber and a laser detection feedback system. Wherein the pulse laser is used for emitting first laser, and the pulse time is nanosecond magnitude. The laser frequency stabilization system is used for carrying out pre-frequency stabilization on the first laser to obtain second laser, and the second laser is conveyed to the Laammer type hot atom chamber through the optical switch; the switching period of the optical switch is set to be microsecond magnitude; the lamplug type hot atom chamber is used for outputting a lamplug type hot first atom beam; and the laser detection feedback system is used for detecting the first atomic beam, feeding back and controlling the pulse laser, locking the frequency of the pulse laser on a transition spectral line of atoms, and obtaining a hot atomic beam light clock. According to the invention, the interaction time of laser and atoms can be controlled, and the utilization rate of the atoms of the Lammer-type hot atomic beam light clock can be improved.

Disclosed is a detection device for laser spot welding micro-weld spot quality based on laser ultrasound, comprising: a nanosecond pulsed laser configured to emit a laser; a half-wave plate configured to generate a phase difference of the laser; a scanning galvanometer configured to focus the laser as a point source and excite an ultrasonic wave on a surface of a sample; a multi-axis displacement platform configured to place and / or move the sample; a laser Doppler vibrometer configured to emit a probe light; an image sensor configured to acquire image data of the sample in a plurality of attitudes; an optical filter configured to receive the probe light to adjust an intensity of the probe light; and a processor configured to be in communication connection with the image sensor, the optical filter, the nanosecond pulsed laser, the scanning galvanometer, the multi-axis displacement platform, and the laser Doppler vibrometer.

We present a ground-based laser system for searching, ranging, and tracking that actively illuminates small resident space objects (RSOs) in low Earth orbit (LEO) and observes position and transit-time of reflections, enabling orbital custody of most one-to-few centimeter-sized objects. A diode-pumped alkali laser (DPAL) augmented with mode-locking and Q-switching serves as an illuminator and offers exceptionally high spectral brightness due to its output beam's sub-nanosecond pulse duration and picometer-level spectral linewidth. Kilohertz fast-rastering enables interrogations of distinct few-meter-sized sky-patches at megahertz rates. Paired on the observation side with one or more telescopes outfitted with Faraday anomalous dispersion optical filters (FADOFs), image intensifiers, multi-pixel arrays, and nanosecond timing, the combined system could offer nearly background-free discoveries of RSOs every hour, even during daytime. Periodically re-flashing previously discovered objects to maintain orbit custody expends only a small fraction of total observing time.

The invention discloses a single-photon non-vision-field target tracking system based on an unmanned aerial vehicle platform, which belongs to the field of non-vision-field imaging and is characterized in that a laser is connected with a scanning galvanometer assembly through a first nanosecond optical path switch and an optical fiber circulator to form an emission optical path for emitting laser pulses to relay reflecting surfaces corresponding to four predetermined positioning points; the scanning galvanometer assembly is connected with the photon detector through the collimating optical fiber, the optical fiber circulator and the second nanosecond optical path switch to form a receiving optical path capable of receiving echo photons; the main control module is electrically connected with the laser, the first nanosecond light path switch, the second nanosecond light path switch, the scanning galvanometer assembly, the photon detector, the time-to-digital converter and the high-frequency inertial measurement unit respectively, and can control each component to perform laser ranging, double-window gating, single-photon detection, inertial measurement unit sampling and timing according to a unified time sequence; and the three-dimensional coordinates of the current non-vision target are calculated by using the distance measurement data through an ellipsoid intersection solution method, so that non-vision target tracking is realized.

The invention discloses a gas leakage detection imaging device and method based on a single photon detection technology, and belongs to the technical field of gas detection and imaging. Aiming at the limitation problems of the existing gas leakage detection technology in the aspects of sensitivity, response speed, space imaging capability and anti-interference capability, nanosecond modulation control and synchronous photon counting are realized by utilizing an FPGA (Field Programmable Gate Array) through a visual gas detection imaging device combining an SPAD (Single Program Amplifier) array detector and a WMS modulation-demodulation mechanism; and the second harmonic of the absorption signal is further extracted by combining digital phase-locked amplification, so that gas leakage three-dimensional imaging with high spatial resolution, ppb-level sensitivity, strong background suppression capability and high time response is realized. The system has the advantages of high detection sensitivity, real-time imaging capability with high spatial resolution, high background light interference resistance and high signal-to-noise ratio, the demodulation method is novel, and the modular design has multi-gas compatibility and system expansibility.

A device useful as a spectrometer or a sensor, comprising a source of a short electromagnetic pulses at a first wavelength and having a full width at half maximum in a range of 1 femtosecond-1 nanosecond; a sample holder in which the short pulses interact with the sample in the sample holder so as to form an output signal comprising a background residual of the short pulses and a sample response signal in the time domain, and an amplifier comprising nonlinear medium. The nonlinear medium comprises an input for receiving the output signal and a pump pulse at a second wavelength, and a second-order nonlinearity configured for a nonlinear process selectively amplifying the sample response signal, for example by temporally overlapping the pump pulse and the sample response signal.

The invention provides a wafer-level cluster coplanar waveguide electrode array, a preparation method and a test system. The coplanar waveguide electrode array comprises an insulating substrate and a plurality of coplanar waveguide electrodes which are arranged in a periodic array; each coplanar waveguide electrode comprises a central transmission section, a probe pad and a gradual transition section; through the design of the central transmission section and the gradual transition section of the coplanar waveguide configuration, the whole-course impedance matching from an external probe to a nano gap is ensured, so that nanosecond and even picosecond-level ultrafast electric pulses can be transmitted to the cluster function unit with extremely low loss and distortion; through overlay and multi-step photoetching and in combination with a negative feedback electromigration technology, a nano gap is manufactured with high success rate, and a cluster function unit is integrated; besides, a test system integrating a coplanar waveguide electrode array and a high-end test instrument is used for exciting and capturing the ultrafast response of a cluster functional unit, and the single write-in time of a cluster device is directly pushed to a subnanosecond level (lt;

The invention discloses a high-safety nanosecond-order delay transistor testing system and method, belongs to the field of transistor testing, and can test the characteristics of a transistor to be tested at any drain voltage stress value, drain voltage stress duration and load current based on nanosecond-order measurement delay on the basis of ensuring the safety of the testing system and experimenters. The circuit comprises switches S1, S2 and S3, resistors RA and RC, Schottky diodes D1 and D2, a power inductor L and a power supply VDD. The conduction time of the switch S1 can be controlled to control the duration of the post-stage circuit for bearing the high voltage VDD; the current value of the power inductor L at the end of charging can be controlled by controlling the conduction time of the switch S2; by testing the voltage and the current of the switch S3, the switch transient characteristic, the on-resistance characteristic and the like of the switch S3 can be obtained. Simulation and experiments prove that the measurement delay of switching to the test state after the voltage stress of the drain electrode is ended is nanosecond magnitude, and the situation of'large current connection caused by mistaken switching-on of a series switch 'does not exist, so that the circuit safety is higher.

The invention discloses a manufacturing process of a COB (Chip On Board) process circuit board for photoelectric display. The manufacturing process comprises the following steps: performing constant-amplitude direct-current driving on a light-emitting chip array before injection of packaging glue to obtain full-board light field baseline data; the refractive index distribution of the packaging adhesive is regulated and controlled through multi-phase current pulses after the packaging adhesive is injected; forming a composite structure of a high-refractive-index chip interconnection interface and a low-refractive-index packaging surface by using Joule heat in a packaging adhesive crosslinking stage; the metal surface roughness is adjusted through nanosecond cosine pulses so as to control the plasma resonance characteristic; and finally, carrying out fine adjustment on the local refractive index by utilizing the interaction of the moving ions and the polar side chain. According to the technical scheme, stable refractive index distribution can be formed in the chip packaging structure through multi-physics field coupling regulation and control, formation of sub-wavelength stray light waveguides is effectively restrained, the problems of dynamic color cast and brightness flicker in an ultra-small pixel pitch COB display device are solved, and the optical performance consistency of the device is improved.

The invention discloses a multi-field adjustable high-speed electro-optical logic device and an implementation method thereof. According to the invention, light output is electrically controlled, and two logic functions are realized on the same device; the input laser wavelength comprises a main communication wave band, and a PL output signal is matched with an atmosphere window, so that information transmission is facilitated; the working switch ratio of the logic device is greater than two orders of magnitude, static power consumption is reduced, and the anti-interference capability and the accuracy of logic operation are improved; the response time is short, the key effect on improving the operation speed is achieved, and high-frequency work is supported; a PL output signal is sensitive to polarization, so that the degree of freedom of transmitted information is higher; the method is applied to the fields of encryption transmission of efficient optical communication, logic operation in an all-optical chip and the like; not only is the working switch ratio as high as 2 orders of magnitude shown, but also the nanosecond-order response speed can be maintained, so that the method has great potential to solve the problems in the science and technology fields such as encryption transmission of efficient mid-infrared light communication.

The invention provides a laser-induced plasma visualization experiment platform and a use method. The laser-induced plasma visualization experiment platform comprises a laser-induced breakdown module, an image acquisition module and a control module, the laser-induced breakdown module comprises a laser used for emitting pulse laser, an attenuator, a beam compressor and a beam splitter are sequentially arranged in the pulse laser propagation direction of the laser, and a reflector, an amplification objective lens and a cuvette are arranged in the propagation direction of a beam of pulse laser split by the beam splitter; the image acquisition module comprises a high-speed camera and an ICCD (Intensified Charge Coupled Device) camera, and a lens of the high-speed camera and a lens of the ICCD camera are both compared with the cuvette; the control module comprises a computer control submodule and a signal generator, the computer control submodule is in communication connection with the signal generator, the high-speed camera and the ICCD camera, and the signal generator is in communication connection with the laser, the high-speed camera and the ICCD camera. According to the platform, the whole dynamic process of induced breakdown of nanosecond pulse laser in liquid is visualized.

The invention discloses a nanosecond pulse hollow cathode electron beam current evaluation system, which aims at the problem of limited capacity of a current satellite communication channel, researches a nanosecond pulse high-current electron beam for driving a terahertz radiation source, and measures electron beam current and energy density distribution. The device is fixed on a four-axis motion platform through a Faraday cup with a slit hole, and the four-axis platform comprises an x axis, a y axis, a z axis and an R axis. Under the driving of the four-axis platform, the nanosecond time response Faraday cup can rotate around the z axis and sweep the section of the electron beam at a certain rotation angle in the direction perpendicular to the slit, and accordingly parallel projections of the electron beam at different angles are obtained. And current density distribution of a certain section of the electron beam is obtained through a filtering back projection algorithm program of the computer. On the basis, the three-dimensional density distribution of different energy electrons is obtained by changing the axial distance and the electron energy screening voltage, and then the time-space domain distribution of the electron beam energy density is obtained.

The invention relates to a high-peak power nanosecond pulse fiber laser and a use method, and belongs to the technical field of fiber lasers. The nanosecond pulse optical fiber laser sequentially comprises a nanosecond pulse seed, a seed isolation filter arranged at the output end of the nanosecond seed, a first-stage amplification structure, a second-stage amplification structure arranged behind the first-stage amplification structure, a passive homogenization optical fiber, a third-stage amplification structure and an anti-resonance hollow-core optical fiber. And before entering the three-stage amplification, a passive homogenizing optical fiber is adopted to degrade the beam quality of the signal light, a high-order mode is further excited, energy distribution is homogenized, the highest energy density borne by the end face of the optical fiber is reduced, various nonlinear effects are further inhibited, and nanosecond pulse laser output with higher peak power is realized.

The invention relates to a nanosecond fiber laser and method for high-order chaotic pulses. A fiber ring cavity of the laser comprises a wavelength division multiplexer, an erbium-doped fiber, a first polarization controller, an analyzer, a second polarization controller, an output coupler, a dispersion control unit, a fiber isolator and a band-pass filter which are connected in sequence. The method comprises the steps that pumping continuous light is coupled into the laser through the wavelength division multiplexer; pumping continuous light is absorbed by using an erbium-doped optical fiber and is stimulated to radiate a long-wave-band gain pulse; under the combined action of the first polarization controller, the polarization analyzer and the second polarization controller, an equivalent saturable absorption effect is generated by utilizing nonlinear polarization rotation generated when gain pulses are propagated in an optical fiber, and large anomalous dispersion is introduced to realize generation of nanosecond pulses; through the band-pass filter, nanosecond pulses are allowed to be generated, and meanwhile, the nonlinear increasing speed of propagation and accumulation of the nanosecond pulses in the cavity is controlled, so that order-by-order generation of high-order chaotic pulses is realized. According to the invention, reliable output of high-order chaotic pulses can be realized.

The mid-infrared optical parametric oscillator pumped by the dual-wavelength nanosecond pulse solid laser can simultaneously output 1.9 micron laser and 2.1 micron laser, realizes broad spectrum / multi-wavelength output of the mid-infrared optical parametric oscillator, and can ensure that mid-infrared laser has excellent beam quality and relatively high output power. The output power of the 1.9 [mu] m optical fiber laser pumping source is hectowatt magnitude, and the 1.9 [mu] m optical fiber laser pumping source serves as a pumping source of a Ho crystal in the solid laser oscillator. In a Tm solid laser oscillator and a Ho solid laser oscillator, a resonant cavity comprises two plano-concave sub-cavities, the two plano-concave sub-cavities are a Tm crystal oscillation cavity and a Ho crystal oscillation cavity respectively, the two plano-concave sub-cavities share one output mirror, the Tm crystal oscillation cavity adopts a 793 nm semiconductor laser for pumping, and the Ho crystal oscillation cavity adopts a 1.9 [mu] m optical fiber laser pumping source I for pumping; in the phosphorus-germanium-zinc optical parametric oscillator, a planar four-mirror annular cavity is used as a single-resonance optical parametric oscillation cavity.

The invention discloses a double-pulse-sequence laser-assisted in-situ chemical etching method for improving semiconductor thinning efficiency. The method comprises the following steps: firstly, placing a semiconductor wafer in a prepared chemical etching solution; then the liquid level height is adjusted, and nanosecond and ultrafast laser multi-focus flat-topped light beams are modulated through a spatial light modulator; then performing first processing on the semiconductor material in the ablation liquid by using nanosecond laser to realize removal at a specific depth, and then performing second processing by using ultrafast laser to remove a defect layer introduced by the nanosecond laser and optimize the quality of the substrate; and finally, the semiconductor material is taken out, and atomic-scale flattening processing is carried out through chemical mechanical polishing. The method has the advantages of high efficiency, high repeatability, high controllability and the like, and the thinning efficiency and quality of the semiconductor substrate can be effectively improved.

The invention discloses a high-temperature high-density plasma generation and radiation opacity measurement method, which comprises the following steps: clamping a target material by using low-density low-Z-element foam to form a sandwich structure sample, and synchronously and directly driving the sandwich sample from two sides by using multiple beams of smooth nanosecond laser, the preparation temperature reaches 1,000,000 DEG C, and the electron density reaches 1 * 1023 pieces per cubic centimeter; then generating an X-ray source through the action of one or more nanosecond laser beams and the high-Z material, measuring the absorption spectrum of the X-ray source penetrating through the target plasma, the backlight spectrum of the X-ray source not penetrating through the target plasma and the self-emission spectrum of the target plasma through a spectrograph, and finally realizing the measurement of the radiation opacity of the high-temperature and high-density plasma. The high-temperature and high-density plasma radiation opaqueness measurement device has the beneficial effects that the high-temperature and high-density plasma radiation opaqueness measurement of which the temperature reaches 1,000,000 DEG C and the electron density reaches 1 * 1023 per cubic centimeter is realized on a million-joule nanosecond laser device.

The invention relates to the technical field of laser pulses, in particular to a composite pulse laser device which comprises an output mirror, a polaroid, a laser gain module, a first reflecting mirror, a first Q switch, a second reflecting mirror, a second Q switch and a controller. A second reflecting mirror, a second Q switch, a polaroid and an output mirror form a second pulse laser resonance arm cavity, the polaroid transmits the first-direction polarized laser and reflects the second-direction polarized laser, and laser of tens of nanoseconds and hundreds of nanoseconds is output from the laser gain module and the output mirror. The pulse laser output of the first pulse laser resonance arm cavity and the second pulse laser resonance arm cavity is controlled through the controller, flexible adjustment of pulse intervals is achieved, the structure is compact, design is flexible, laser output of tens of nanoseconds and laser output of hundreds of nanoseconds can be achieved at the same time under the control of the same electric signal, and high practicability is achieved.

The invention discloses a multi-modal AI material quantitative and qualitative rapid detection method, which comprises the following steps: acquiring multi-modal data through a double-pulse laser excitation system, carrying out time-space alignment, and cooperatively exciting light and heavy element characteristic plasmas by using femtosecond laser and nanosecond laser; spectral decoupling and dynamic compensation are carried out based on physical rule embedding, spectral signals are separated, and interference is suppressed; a light-heavy element dual-channel deep learning model is constructed, and multi-modal data is fused, so that feature extraction and prediction capabilities are improved; and a double-source mutual verification optimization model is adopted, so that the result reliability is ensured. According to the method, the limitation of single-mode detection is overcome, multi-component high-precision real-time synchronous detection of coal is realized, the adaptability of the model to complex coal quality and environmental change is improved, and an effective and accurate solution is provided for online monitoring of coal quality of a coal-fired power plant.

The present invention discloses a system and method for continuous observation of multiple time scales during femtosecond laser processing. The system comprises a femtosecond laser light source, a laser processing system, a pulse shaping system, and a multi-time scale continuous observation system. The multi-time scale continuous observation system comprises a femtosecond ultrafast continuous imaging system, a picosecond-nanosecond ultrafast pump-probe system, a nanosecond-millisecond ICCD continuous imaging system, and a microsecond-second high-speed camera system. Compared to other ultrafast imaging systems, the present invention enables ultrafast continuous observation of femtosecond laser processing across multiple time scales. Its observation time range extends over 13 orders of magnitude, from hundreds of femtoseconds to seconds, encompassing the entire physical and chemical reaction process. This system plays a crucial role in providing a deeper understanding and understanding of a range of nonequilibrium and nonlinear ultrafast phenomena in femtosecond laser processing.

The nanosecond narrow pulse circuit comprises a nanosecond narrow pulse signal generation circuit and a signal driving enhancement circuit, an external trigger signal respectively passes through a first buffer and a second buffer of the nanosecond narrow pulse signal generation circuit to obtain two paths of same signals, a second resistor of the second RC time delay circuit is a digital potentiometer, the pulse width of signals can be set by changing the resistance value of the digital potentiometer, narrow pulse signals are obtained after two paths of same signals pass through a first AND gate, and narrow pulse signals with opposite phases and high driving capacity are obtained after the narrow pulse signals are input into a gate driving chip. And when the signal output by the gate driving chip is low level, the bias voltage, the current-limiting resistor and the light emitting diode form a current loop through the gate driving chip, and the light emitting diode is excited to emit light. The technical problems that an existing scheme for achieving a second narrow pulse laser is high in cost, difficult to be suitable for batch production and low in reliability are solved.

The present disclosure provides a time compensation method and system for interference test equipment. The method includes: obtaining a first delay time and a second delay time; decomposing the first delay time and the second delay time to obtain a nanosecond scale delay time corresponding to the first delay time and a picosecond scale delay time corresponding to the second delay time; performing lead compensation for the nanosecond scale delay time by a configurable lead compensation and output module to obtain a nanosecond scale lead compensation time; performing lag compensation for the picosecond scale delay time by a delay compensation module to obtain a picosecond scale delay compensation time, and calculating a sum of the nanosecond scale lead compensation time and the picosecond scale delay compensation time to obtain a picosecond scale lead compensation time; and applying an interference signal on a controller area network, CAN, bus based on the picosecond scale lead compensation time. Therefore, by using a plurality of timing controllers connected in cascade in the delay compensation module, the picosecond scale delay compensation time is realized.

The invention relates to the technical field of slice lasers, in particular to a Yb-based high-power pulse slice laser with an adjustable pulse width. Comprising a pumping source, a multi-pass pumping module and a resonant cavity which are sequentially arranged along a light path, and the resonant cavity is composed of a first end mirror, a thin-sheet crystal, a thin-film polaroid, a quarter-wave plate, an electro-optical switch and a second end mirror according to the light path sequence. The slice crystal serves as a gain medium and is used for pumping pump light and generating a laser beam; the thin film polarizer highly transmits horizontal polarized light and highly reflects vertical polarized light and is used for outputting laser in the cavity, the quarter-wave plate and the electro-optical switch are used for controlling loss in the cavity so as to output nanosecond pulses, and the plane mirror is used as a resonant cavity end mirror. The pulse width output by the slice laser can be effectively regulated and controlled, the regulation range reaches ten to hundreds of nanoseconds, and the power output by the laser does not change along with the change of the pulse width.

We present a ground-based laser system for searching, ranging, and tracking that actively illuminates small resident space objects (RSOs) in low Earth orbit (LEO) and observes position and transit-time of reflections, enabling orbital custody of most one-to-few centimeter-sized objects. A diode-pumped alkali laser (DPAL) augmented with mode-locking and Q-switching serves as an illuminator and offers exceptionally high spectral brightness due to its output beam's sub-nanosecond pulse duration and picometer-level spectral linewidth. Kilohertz fast-rastering enables interrogations of distinct few-meter-sized sky-patches at megahertz rates. Paired on the observation side with one or more telescopes outfitted with Faraday anomalous dispersion optical filters (FADOFs), image intensifiers, multi-pixel arrays, and nanosecond timing, the combined system could offer nearly background-free discoveries of RSOs every hour, even during daytime. Periodically re-flashing previously discovered objects to maintain orbit custody expends only a small fraction of total observing time.

The present invention discloses a method for preparing a high-performance PVDF-based energy storage film based on nanosecond electric pulse induction, the steps of which include: preparing a polyvinylidene fluoride-hexafluoropropylene (P(VDF-HFP) solution, taking an appropriate amount of the solution and evenly dropping it into a cleaned glass groove, and applying different nanosecond electric pulses at a certain temperature. After naturally cooling to room temperature, the film is quenched and then placed in a vacuum drying oven for drying to further remove moisture and residual solvent. The present invention controls the amplitude, pulse width, frequency, pressurization time, vacuum drying time and temperature of the nanosecond electric pulse and customizes the size of the groove, and adopts a solution casting method to obtain β P(VDF‑HFP) films with high phase content and excellent energy storage performance, β The phase content is more than 80%, and the charge and discharge energy density is 14 J / cm 3 , the charge and discharge efficiency can reach more than 60%. The present invention eliminates the complicated secondary process, is simple to operate, greatly saves production costs, and has obvious advantages and application prospects in the preparation of high-performance PVDF-based energy storage films.

The invention discloses a method and a device for realizing flow regulation double-speed three-color marking based on time, which are characterized in that a token bucket and tokens are replaced by using time, the time is naturally increased forwards, the number of tokens in similar tokens can be calculated by recording related time points and through a time difference value, and the number of the tokens in the similar tokens is subtracted from a message, so that the number of the tokens in the similar tokens can be calculated. And determining whether the message can pass or not so as to color the message. Compared with token bucket speed limiting, logic is similar, but the design is simple, the calculation granularity is finer, calculation can be conducted with nanosecond as the unit, a large amount of chip design cost is saved, the chip area and tape-out cost are reduced, and meanwhile the function is more reliable and stable.