15 results about "Pulse amplifiers" patented technology

The application discloses a mass spectrometer for measuring a low-isotope-content sample and belongs to the technical field of mass spectrometers. The mass spectrometer comprises a receiving device and a signal processing unit. The receiving device comprises a vacuum cavity, a metal target, a vacuum plastic flash body, a high-voltage electrode plate, a vacuum glass window, a photomultiplier tube and a photomultiplier tube cover. The signal processing unit comprises a high-voltage stabilizer and a pulse amplifier. The application converts ions into secondary electrons through the metal target, provides voltage for the metal target and the high-voltage electrode plate by the high-voltage stabilizer to form a high-intensity electric field, accelerates the secondary electrons to bombard the vacuum plastic flash body to generate an optical signal, receives and converts the optical signal into a pulse signal by the photomultiplier tube through the vacuum glass window, and finally performs shaping, amplification and conversion processing on the pulse signal by the pulse amplifier. The application does not need to rely on imported super-high resistance resistors, realizes the localization of the receiving device of the mass spectrometer, and has the advantages of high signal conversion efficiency, strong anti-interference capability, stable and reliable measurement and the like.

The utility model discloses a silicon controlled rectifier trigger power supply system for a fused salt heating power supply, relates to the field of power supplies, and solves the problems of large size, high cost and the like caused by realizing the fused salt heating power supply through a transformer. The frequency and duty ratio are changed through the signal source, the power supply voltage of the pulse amplifier to the driving board is adjusted, the output current and frequency of the pulse amplifier are adjustable, the requirements of different occasions are met, the beam splitting plate is divided into multiple paths of pulses through the controller, the synchronism of multiple paths of optical signals is guaranteed, and the light splitting efficiency is improved. Therefore, the conduction consistency of the silicon controlled rectifiers in the series valve group is greatly improved, the probability that few silicon controlled rectifier modules in the series valve are damaged due to bearing over-high voltage for a long time is reduced, a transformer is not needed, the size is small, the weight is light, and the problems of large size, high cost and the like caused by realizing a molten salt heating power supply through the transformer are solved.

The invention discloses a 2-micron short-period laser amplifier based on a thulium-doped positive dispersion fluorotellurite optical fiber, which can solve the problem that a negative dispersion thulium-doped optical fiber is not suitable for performing gain management nonlinear amplification on a 2-micron pulse, and can obtain a pulse width lt. 50 fs, and single pulse energy gt; the femtosecond laser output device has the advantages of being full-fibrillated and compact in structure. The 2-micron femtosecond seed source is femtosecond pulse laser of a 2-micron wave band generated based on nonlinear amplification loop mirror mode locking; the chirped pulse amplifier is used for obtaining sub-picosecond 1.9 mu m femtosecond laser output with the average power greater than or equal to 1W; the optical fiber GMN amplifier is used for obtaining a few-period femtosecond pulse; the high-power optical fiber pulse compressor is a hollow-core optical fiber and is used for carrying out accurate dispersion compensation and high-quality pulse compression.

This invention discloses a device for locating vibration events on power transmission lines. The device includes a pulsed laser module, an optical pulse amplifier, an optical fiber circulator, an optical fiber polarizer, a sensing optical fiber, a photodetector, a data acquisition card, and a data processing and control unit. It utilizes the optical fiber inherent in the power transmission line or a separately laid optical fiber as the sensing fiber. While the optical pulse propagates in the sensing fiber, it generates a Rayleigh scattering signal. Vibration events on the power transmission line disturb the polarization state and phase of the Rayleigh scattering signal, resulting in a significant difference in noise convergence in the obtained optical time-domain reflectometry curve before and after the location of the induced vibration on the sensing fiber. Therefore, the location is determined by identifying the convergence start point. This device is suitable for locating external vibration sources on quasi-static power transmission lines and has advantages such as long monitoring coverage distance, high positioning accuracy, and low false alarm rate.

The utility model discloses a kind of distributed optical fiber temperature detection systems, including the sensing optical fiber being laid along the length direction of low temperature pipeline;The end of the sensing optical fiber is provided with laser light source and optical signal pulse amplifier, the laser light emitted by the laser light source enters the sensing optical fiber after amplification by the optical signal pulse amplifier, and raman scattering occurs at each position of the sensing optical fiber;The end of the sensing optical fiber is also provided with data acquisition module, APD photoelectric conversion module and wave division multiplexer, laser scattering in the sensing optical fiber will form the echo signal of different wavelength stokes light and anti-stokes light, the echo signal of the sensing optical fiber is converted after passing through the wave division multiplexer and the APD photoelectric conversion module, enters the data acquisition module, and the data acquisition module obtains the light intensity signal of at least two beams of light, based on the principle that light intensity is different under different temperatures, the temperature condition of reflection point is obtained by analyzing light intensity change.

The utility model relates to four program femtosecond laser compressor, through the light of first time through the compressor output is injected into the compressor for many times, incident chirp pulse is along the compressor light path and is emitted four times, total transmission grating 8 times, finally through the output mirror output completes compression output, make the number of times of light beam through grating increase to 16 times, make the same grating aperture and grating spacing compressor dispersion quantity turn 4 times, adapt to bigger spread width or bigger bandwidth chirp pulse amplifier, many times repeat, expand the use number of times of compression grating, obtain bigger compression under the condition that the grating spacing of compressor is unchangeable, can be compatible with bigger spread width of chirp pulse amplifier, solve the problem of design limit of chirp pulse amplifier, promote femtosecond laser output single pulse energy.

The application belongs to the field of laser emitting devices, and provides a system and method for compensating high-order dispersion through cooperative adjustment of stretching and compression, calculating second-order dispersion and third-order dispersion introduced by a pulse amplifier; adjusting the introduced third-order dispersion by changing the grating incident angle in a pulse stretcher, so that the third-order dispersion is offset with the total third-order dispersion of the system; calculating the second-order dispersion value required to be provided by the pulse compressor according to the second-order dispersion change generated after the angle adjustment of the pulse stretcher, and accurately compensating by adjusting the effective distance of the grating pair; feeding back the third-order dispersion of the pulse compressor after adjustment to correct the angle of the pulse stretcher again, and repeating the above steps until the total second-order dispersion and third-order dispersion of the system tend to be zero, so as to realize near transform limit compression. The application adjusts the grating incident angle of the stretcher and the effective distance of the grating of the compressor, so that the second-order dispersion and third-order dispersion in the ultrafast laser system are simultaneously compensated, and near transform limit pulse output is obtained.

According to the four-way femtosecond laser compressor and the method, light output through the compressor for the first time is injected into the compressor for multiple times, incident chirped pulses enter and exit for four times along the light path of the compressor, the incident chirped pulses pass through a transmission grating for eight times in total, and finally the incident chirped pulses are output through an output reflector to complete compression output; the number of times that a light beam passes through the grating is increased to 16, so that the dispersion amount of a compressor with the same grating caliber and grating spacing is increased by 4 times, and the chirped pulse amplifier with larger spreading amount or larger bandwidth is adapted; according to the femtosecond laser, the use frequency of the compression grating is expanded repeatedly, and a larger compression amount is obtained under the condition that the space between the compression grating is not changed, so that the larger broadening amount of the chirped pulse amplifier can be compatible, the problem of design limitation of the chirped pulse amplifier is solved, and the output monopulse energy of the femtosecond laser is improved.

The invention provides a phase delay self-compensating vector polarized light parametric chirped pulse amplifier which comprises a narrow-band pulse laser, a broadband pulse laser generating device, a half-wave plate, a polarization beam splitter, a pulse stretcher, a laser mode converter, a first nonlinear crystal, a second nonlinear crystal and a pulse compressor. The phase delay introduced by the second-stage optical parameter chirped pulse amplification to the two orthogonal polarization components of the vector polarization signal light is used for counteracting the dynamic phase delay accumulated in the first-stage optical parameter chirped pulse amplification process. The objective of the invention is to solve the problem of polarization distortion of vector polarized light caused by different accumulated phase delays of all frequency components in the optical parameter chirped pulse amplification process, so that the vector polarized light can obtain broadband high-gain amplification while the initial polarization characteristic of the vector polarized light is kept unchanged. Vector polarized light parametric chirped pulse amplification with high polarization purity and high peak power is realized.

The invention discloses a self-excited oscillation and acoustic vortex ring synergetic fluid enhanced flotation treatment device and a self-excited oscillation and acoustic vortex ring synergetic fluid enhanced flotation treatment method. The device comprises a feeding mechanism, a feeding conveying pipe, a volute pre-rotating mechanism, a stepped ultrasonic strengthening mechanism, a Helmholtz cavity pulsating amplifier and a main body flotation mechanism, wherein the volute pre-rotating mechanism and the stepped ultrasonic strengthening mechanism are sequentially arranged on the feeding conveying pipe in the feeding direction, the Helmholtz cavity pulsating amplifier is arranged on the volute pre-rotating mechanism, and the main body flotation mechanism is connected with the tail end of the feeding conveying pipe. The Helmholtz cavity pulsating amplifier comprises a teardrop type shell, a reducing neck pipe communicated with an amplifier inlet in the upper portion of the teardrop type shell, an auxiliary self-suction air inlet assembly arranged on the periphery of a throat pipe part of the reducing neck pipe, a flow stabilizing assembly arranged in the teardrop type shell and a pressure sensor arranged on the teardrop type shell. The method is particularly suitable for mineral flotation, wastewater air flotation treatment, biological reaction enhancement and other scenes, and accurate generation and efficient collision mineralization of micron-sized bubbles can be achieved by cooperatively regulating and controlling bubble size distribution and the particle-bubble collision dynamic process.

The utility model discloses a material defect detection device based on an ultrasonic transmission reflection method. The material defect detection device comprises an AD sampler (1), a pulse signal source (2), a directional coupler (3), a first ultrasonic probe (4), a test sample (5), a pulse amplifier (6) and a matched load (7), the directional coupler (3) is provided with a first port (8), a second port (9) and a third port (10), the first port (8) is communicated with the third port (10), and the second port (9) only receives part of echo signals of the third port (10), so that the AD sampler (1) is connected with the second port (9), and detection signals from the first ultrasonic probe (4) can be acquired in real time; the AD sampling device (1), the pulse signal source (2) and the directional coupler (3) are integrated in the packaging shell (11), signal connection in the packaging shell (11) is fixed, only the first external port (12) and the second external port (13) are arranged, and two tests of an ultrasonic transmission method and a reflection method can be achieved.

There is described a laser pulse generator, comprising: one or more seed laser sources for generating a plurality of sequentially-timed seed pulses; input optics arranged to direct the plurality of sequentially-timed seed pulses through gain medium; the gain medium configured to be pumped by pump diodes to increase the energy of the pulses; and synchronisation optics arranged to guide the plurality of pulses from the gain medium along respective delay paths to temporally synchronise the pulses at one or more targets. Spatial recombination may also be included. Corresponding methods are described.

The invention discloses a multi-channel synchronous pulse generator based on discrete devices, which comprises a synchronous trigger control module and M synchronous pulse generation circuits, and is characterized in that the synchronous trigger control module is used for generating a trigger signal; the M synchronous pulse generation circuits are used for respectively generating M synchronous pulses with the same channel pulse width according to the received trigger signal and outputting the M synchronous pulses, and each synchronous pulse generation circuit comprises a pulse generation module, a pulse shaping module, a pulse amplification module and an output interface, in the pulse generation module, an RC circuit is adopted in front of and behind a pulse generation chip respectively to achieve pulse delay and pulse width adjustment, and consistent output of multi-channel pulse signals is achieved. The synchronous pulse generator is designed and built by using a discrete logic device, the pulse delay and the pulse width are adjusted at high precision by adjusting the resistance value of the adjustable resistor in the RC circuit, and the consistent output of multi-channel pulse signals is realized.

Delivery systems comprising pulse producer and first pulse supplier including first optical fiber path, first pulse amplifier and first delivering end. Pulse producer produces first low-power laser pulse having power predefined to avoid or minimize deformation of first low-power laser pulse. First pulse amplifier amplifies first low-power laser pulse to produce first high-power laser pulse having power predefined to operate first end-component connectable with first delivering end. First optical fiber path has initial section to convey first low-power laser pulse from pulse producer to first pulse amplifier, and final section to convey first high-power laser pulse from first pulse amplifier to first delivering end. First pulse amplifier is arranged at a position along first optical fiber path corresponding to distal position relative to pulse producer or proximal position relative to first delivering end. Methods and computer programs suitable for being performed by / at such delivery systems.

This invention discloses a broadband all-fiber femtosecond laser system based on chirped pulse amplification and its adjustment method. The broadband all-fiber femtosecond laser system includes a broadband dissipative soliton mode-locked fiber laser and an all-fiber chirped pulse amplifier connected together. The broadband dissipative soliton mode-locked fiber laser includes a first pump source, a first wavelength division multiplexer, a first gain fiber, a first polarization controller, a polarization-dependent isolator, a second polarization controller, and a coupler. The all-fiber chirped pulse amplifier includes a first polarization-independent isolator, a dispersion-compensating fiber, a second wavelength division multiplexer, a second gain fiber, a third wavelength division multiplexer, a single-mode fiber, a second polarization-independent isolator, a second pump source, and a third pump source. The system achieves broadband characteristics through fiber length adjustment, spectral adjustment, and micro-adjustment modules. This invention has a simple structure, wide application scenarios, pulse distortion resistance, broad spectrum, and strong anti-interference capability.