117results about How to "Quick tune" patented technology

The invention provides a novel fuzzy and deadbeat algorithm vector control system of a permanent magnet synchronous motor. The novel fuzzy and deadbeat algorithm vector control system comprises a fuzzy PI controller, a deadbeat current predictive control module, a space pulse width vector modulation module, a three-phase two-level inverter, a permanent magnet synchronous motor module and a 3s / 2r changing module. The novel fuzzy and deadbeat algorithm vector control system can be well applied to a digital control system, and has good application prospects.

The invention discloses a thin-film lithium niobate-based integrated chip and a preparation method thereof. A substrate material is silicon-based thin film lithium niobate; the waveguide is a lithiumniobate ridge waveguide; the structure comprises an input / output port, a Mach-Zehnder electro-optic intensity modulator and a coupled double-ring resonator, a Mach-Zehnder modulator comprises two 1*2multimode interference couplers, two modulation arms and a GSG electrode, two coupling regions of the coupled double-ring resonator adopt coupling coefficient tuning units based on a Mach-Zehnder interference structure, and regulation and control electrodes are arranged in the coupling regions and the cavity; a radio frequency signal is loaded to an optical carrier through the modulator and thenis processed by the resonator, and the output signal is output to a detector or other unit chips through the output end, so that the functions of filtering, time delay and the like are realized. The electro-optical modulator and the micro-ring resonator are integrated, the filtering and time-delay functions are achieved, the all-silicon-based thin film lithium niobate material is adopted, and theadvantages of being large in bandwidth and rapid in tuning are achieved.

The invention discloses a sweep frequency laser light source based on a hyperfine tuned filter. An annular laser oscillation cavity is formed by a semiconductor light amplifier, two polarization controllers, a dispersion control delay line, a circulator, the hyperfine tuned filter and an optical fiber coupler. The hyperfine tuned filter mainly consists of a double-grating combined dispersion system of expanded beam grating-auto-collimation beam grating based on a Littman-Littrow structure and a rotary polygonalmirror. The double-grating layout based on the Littman-Littrow structure utilizes the dispersion and beam expanding ability of the expanded beam grating to improve the caliber of the incident light of the auto-collimation beam grating, form different deviations to the auto-collimation condition of the auto-collimation grating by different coloured lights and improve the angle dispersion ability of the double-grating combined dispersion system. In addition, reasonable matching of grating parameters, incident angles and diffraction efficiency can be easily realized. The tuned filter based on the double-grating and the rotary polygonalmirror can simultaneously ensure the hyperfiness of tuning and high transmissivity of the whole tuning range.

Apparatus and methods that utilize dual, tunable elements to provide for selective wavelength tuning of a light beam. The apparatus comprises a first tunable wavelength selection element (24) positioned in a light beam and having a first adjustable free spectral range, a second tunable wavelength selection element (26) positioned in the light beam and having a second adjustable free spectral range, with the first and second tunable wavelength selection elements configured to define a joint transmission peak that is adjustable in phase according to tuning of the first and second tunable wavelength selection elements.

The invention relates to a lens testing and calibration device, which includes a base, a test seat and a camera mounting seat. A connecting lens barrel is disposed on a camera. The lens testing and calibration device also includes a close-up lens placement rotary disc and more than two groups of test board device. The close-up lens placement rotary disc is connected onto the test seat and is provided with a plurality of close-up lens placement spaces. Each group of test board device includes a moving seat connected slidably with the base and a test board assembly mounted on the moving seat and capable of covering a field angle range of a lens under test or moving away from the field angle range of the lens under test. By use of different movable test boards and close-up lenses mounted on different positions of the close-up lens placement rotary disc, the device can quickly test and calibrate lenses of different focal distances only by slightly moving the test boards and rotating the close-up lens placement rotary disc in the case that a tester is not required to move back and forth with the test seat; and is not only simple and quick in operation and high in production efficiency, but also light in overall weight and easy to carry and transport.

The invention discloses a control system and a control method for locking laser frequency under large tuning quantity and high precision. According to the control method disclosed by the invention, a master laser and a slave laser are adopted, and a beat frequency signal is obtained by beam combination; the injection current of the slave laser is adjusted to control the output frequency of the slave laser so as to control the frequency of the beat frequency signal; two control loops, namely, frequency locking and phase locking, are combined by utilizing a CPLD to achieve the target of controlling the laser frequency within a large dynamic range and under high precision at the same time; and the output light frequency of the slave laser is accurately locked with the output light frequency of the master laser as reference, and thus the output light frequency of the slave laser is controlled under large tuning quantity and high precision. By adoption of the control system and the control method disclosed by the invention, fast laser frequency turning and locking under high tuning quantity (higher than 40GHz) and high precision (1Hz) can be realized; and the method disclosed by the invention can be widely applied to the technical field of fundamental researches and precision measurement such as laser cooling, atomic frequency standard, atomic interferometer, etc.

The invention relates to a tunable laser system. The first kind of structure of the system comprises an output light beam collimating lens, a first laser cavity reflector, laser gain media, a collimating lens in a cavity, an active light phase modulator, a first tunable acousto-optic filter, a second tunable acousto-optic filter, a tunable Fabry-Perot filter and a second laser cavity reflector, wherein the first laser cavity reflector, the laser gain media, the collimating lens in the cavity, the active light phase modulator, the first tunable acousto-optic filter, the second tunable acousto-optic filter, the tunable Fabry-Perot filter and the second laser cavity reflector are sequentially installed. According to second kind of structure of the system, a Fabry-Perot etalon with fixed frequency intervals is further arranged in the first structure, so that the frequency bandwidth of laser output light beams is further compressed, and the output light of the laser is made to be uniform with the transmitted spectrum of the Fabry-Perot etalon in peak value. The tunable laser system has the advantages of being reasonable in design, being provided with non-mechanical moving parts, being stable and reliable in performance, low in cost, small in size, and easy to install and produce, and the like.

The invention provides a wavelength division-time division hybrid passive optical network system, which comprises a central office, a plurality of optical network units and a remote node, wherein the remote node is positioned between the central office and the plurality of optical network units; the central office is provided with a plurality of light sources for emitting downlink signal light of various wavelengths, a plurality of receivers for receiving uplink signal light emitted by the plurality of optical network units and transmitted by the remote node respectively, and a plurality of multiplexer / demultiplexers for multiplexing and demultiplexing the downlink signal light and the uplink signal light; the remote end node is used for multiplexing the downlink signal light from the central office and demultiplexing the uplink signal light from the optical network units; and each optical network unit is provided with an internal annular coupler, a light separating unit for separating downlink signal light into signal light and injection light, a downlink data receiver for receiving separated signal light, and an MEMS (Micro Electro Mechanical System) tunable laser for receiving injection light and generating uplink signal light.

The invention provides a blazed grating external cavity semiconductor laser, comprising a laser, a self-focusing lens arranged on a light path of the laser, a piezoelectric ceramics which is arranged on the light path of the laser behind the self-focusing lens and is wound with optical fibers on the surface thereof, a collimating lens arranged on the light path of the laser behind the piezoelectric ceramics, a blazed grating arranged on the light path of the laser behind the collimating lens in a preset angle and a control module connected with the optical fibers on the piezoelectric ceramics.

The invention discloses a guide rod radio frequency power supply, a tuning method and a mass spectrometer; the guide rod radio frequency power supply comprises the following units: a host computer used for scanning frequency and locking resonance frequency points, and issuing radio frequency frequencies and an amplitude control order; a control and signal processing unit controlled by the host computer so as to form a radio frequency signal with the frequency and amplitude controlled by the control order; a power amplification unit used for amplifying the radiofrequency power of the radiofrequency signal; a boost and auxiliary tuning unit used for boosting the radiofrequency signal amplified by the power amplification unit and carrying out capacitance auxiliary tuning, thus outputting a radio frequency voltage so as to drive the guide rod. The guide rod radio frequency power supply is small in size, low in cost, wide in a tuning scope, easy in tuning, and can drive guide rods (like a level-6 rod or a level-8 rod) of different specifications; frequency modulation tuning and capacitance auxiliary tuning are combined so as to realize fast tuning.

The invention provides a waveguide grating filter. The waveguide grating filter comprises a substrate (1) and a waveguide (2), and further comprises a beam column structure (3) used for supporting thewaveguide (2), wherein the beam column structure (3) comprises column structures (302) and a beam structure (301); the column structures (302) are positioned on two sides of the waveguide (2) and arranged on the substrate (1); the beam structure (301) is used for connecting the column structures (302); an air gap (201) is formed between the waveguide (2) and the substrate (1). According to the waveguide grating filter disclosed by the invention, spectral characteristics of the waveguide grating filter are changed by adopting a thermal tuning method, a local thermal isolation structure betweenthe waveguide and the substrate is realized by forming the air gap below the waveguide, and vertical mobility of the heat is obstructed, so that the power consumption of the waveguide grating filteris reduced. The waveguide grating filter disclosed by the invention has the advantages of being low in power consumption, high in tuning efficiency, fast in tuning, stable in structure, easy to integrate and the like, and has obvious application value in a wavelength division multiplexing system.

The invention provides an external cavity tunable laser and a wavelength tuning method, and belongs to the technical field of lasers. The external cavity tunable laser comprises a semiconductor gain chip, a first collimating lens, a blazed grating and a reflector opposite to the blazed grating, wherein the semiconductor gain chip, the first collimating lens and the blazed grating are located on the same optical axis, and an included angle larger than 0 exists between the grating plane of the blazed grating and the optical axis. The semiconductor gain chip sequentially comprises a sampling grating region, a phase modulation region, a gain region, and a first electrode, a second electrode and a third electrode which respectively cover the sampling grating region, the phase modulation regionand the gain region from left to right. The blazed grating and the reflector are fixed on an electric or manual control mechanical structure. According to the invention, the large-range, rapid and fine tuning of the wavelength by the laser is realized, and the output wavelength can be narrowed.

The invention provides a semiconductor laser and a control method. The semiconductor laser comprises grating regions and a gain region, wherein at least two grating regions are manufactured on the same laser chip in series; the grating period in each grating region is unchanged, and the grating periods of different grating regions are gradually increased or gradually decreased along the laser chip; and one gain region is included between every two adjacent grating regions. The invention further comprises a control method for the semiconductor laser. The method comprises the following steps ofinjecting working current which is higher than a threshold value into any active region, injecting transparent current into the rest of active regions, and generating single-mode laser emission; and adjusting tuning current of the grating region adjacent to the active region injected with the working current, and changing the wavelength of the single-mode laser. According to the semiconductor laser and the control method, the problems of low tuning range, high cost, low productivity and low reliability of a tunable semiconductor laser technology are solved.

The invention discloses a radio frequency filter capable of automatically sensing and rapidly regulating frequency and bandwidth, comprising a metal cavity, wherein a first connector is arranged at one side of the metal cavity; a second connector is arranged at the other side of the metal cavity; a medium substrate is arranged in the metal cavity; the bottom of the medium substrate is covered with copper and grounded; the front side of the medium substrate is provided with a first feed unit and a second feed unit; the first feed unit is connected to the first connector; the second feed unit is connected to the second connector; a resonant unit combination is arranged between the first feed unit and the second feed unit; the resonant unit combination is coupled with the first feed unit and the second feed unit; a variable capacitance diode combination is arranged on the resonant unit combination; and the variable capacitance diode combination is connected to a control unit. The radio frequency filter has the advantages of capabilities of realizing rapid tuning of a filter, dual-mode characteristic of a resonant unit and applying fewer resonant units to realize better filtering characteristics.

The invention discloses a tunable narrow linewidth external cavity semiconductor laser, comprising: a semiconductor gain chip as a laser source; An optical waveguide located on the same optical axis as the gain chip; A grating structure positioned behind the optical waveguide and positioned on the same optical axis as the gain chip and the optical waveguide; A thermistor located on one side of thegain chip and the optical waveguide centerline, avoiding the optical path, the thermistor being located close to the gain chip; An electrode attached to the optical waveguide; A heat sink, a gain chip, a thermistor, an optical waveguide and a grating structure are placed on the same heat sink; A heat sink is placed on the same semiconductor cooling sheet. The invention solves the problems of wavelength jitter and linewidth instability caused by external environment and injection current fluctuation of external cavity laser, thereby realizing accurate control of wavelength and linewidth, and realizing rapid adjustment of wavelength.

The invention relates to a method for fast tuning the angle of LED chip. The method mainly comprises: including the chip into an angle interval; obtaining a rotating pivot angle of the angle interval; selecting the p angle interval, and rotating the chip film according to the rotating pivot angle of the angle interval, wherein, p is equal to 1; positioning the chip m according to the theoretical position coordinates X'm and Y'm after theoretical rotation, and obtaining deviation Lambada x and Lambada y between X'm and Y'm and the actual position of the chip after actual rotation; judging whether Lambada x and Lambada y are larger than a certain threshold, if yes, amending Ox and Oy according to Lambada x and Lambada y and correcting the position of the chip; if no, correcting the position of the chip according to the theoretical position coordinates X'm and Y'm after theoretical rotation; judging whether the chip in the p angle interval is selected and finished, if yes, ending the angle tuning of the chip in the angle interval; proceeding to the angle tuning of the chip of the next angle interval. The invention can improve accuracy of chip angle tuning, effectively reduce the overall chip tuning times and enhance chip angle tuning efficiency, and increase chip sorting speed.

The invention discloses a tunable narrow-band UV laser generating device and a generating method therefor, and belongs to the field of laser technology. The invention solves the problem that a conventional tunable narrow-band UV laser light source is insufficient in wide range tuning capability and the cost is high due to the obtaining way. The tunable narrow-band UV laser generating device comprises a first diode laser, and further comprises a grating, a grating adjusting bracket, a grating controller, a first reflecting mirror, a sawtooth wave generator, a second diode laser, a second reflecting mirror, a dichroic mirror, a lenses group, BBO (Barium Boron Oxide) crystal, a convex lens, a triangular prismy and a diaphragm. In the invention, the two diode lasers are used, and the tunable narrow-band UV laser can be generated through sum frequency, and since the emission band width of the semiconductor laser is smaller than 10 MHz, the band width of the UV laser after sum frequency is guaranteed to be smaller than 0.01 pm. The tunable narrow-band UV laser generating device is suitable for generating tunable narrow-band UV laser.

Apparatus and methods that utilize dual, tunable elements to provide for selective wavelength tuning of a light beam. The apparatus comprises a first tunable wavelength selection element (24) positioned in a light beam and having a first adjustable free spectral range, a second tunable wavelength selection element (26) positioned in the light beam and having a second adjustable free spectral range, with the first and second tunable wavelength selection elements configured to define a joint transmission peak that is adjustable in phase according to tuning of the first and second tunable wavelength selection elements.

The invention relates to a single-mode continuous tunable optical filter which is mainly, technically characterized by comprising two transmission frequency Fabry-Perot tunable filters which are oppositely arranged back and forth, when the free spectral range of a first transmission frequency Fabry-Perot tunable filter is different from the intrinsic free spectral range of a second transmission frequency Fabry-Perot tunable filter at a certain interval, the transmission frequency tunable characteristic of the two transmission frequency Fabry-Perot tunable filters is utilized, so the tunable single-mode output is realized within a certain spectral range. The single-mode continuous tunable optical filter is reasonable in design, has the characteristics of no mechanical moving parts, stable and reliable performance, simple structure, low cost, small size, easiness for installation and production and the like, can meet the required small dimensions and reliable operation under extreme working environments, and can be widely applied in the fields of laser, optical test, optical fiber communication, biology, medical appliance, optical fiber sensor network and the like.

The invention discloses a translation model optimization method for dynamically adjusting length punishment and translation length. The method comprises the steps of obtaining standard data in a specified language direction as a standard bilingual data set for various index prediction; performing word segmentation operation on the standard bilingual data set, and performing further training to obtain a new training data set; modifying a neural machine translation model decoder part, and automatically predicting the optimal length punishment value of the current sentence pair; performing lengthstatistics to obtain a target statement sub-length; preparing an independent feedforward neural network model so that a translation finally predicted by the model tends to a translation result with the optimal length; and enabling the Transformer neural machine translation model to dynamically adjust the length penalty and the optimal translation sentence length for different sentences. Accordingto the method, the length punishment and the dynamic adjustment of the translation length in the model translation process are realized, the realization is simple, the method is effective, the practicability is high, and the model translation quality improvement effect is obvious.

The invention relates to a multi-wavelength intermediate infrared optical parametric oscillator implemented by difference frequency in a multi-seed injection cavity, and belongs to the technical field of multi-length laser. A plurality of seed light with different wavelengths are injected into a stable optical fiber laser pumping optical parametric oscillator, stable strong signal light exists in an optical parametric oscillator cavity already, the injected multi-wavelength seed light cannot generate difference frequency with the signal light, thus, a plurality of intermediate infrared laser outputs with different wavelengths are generated; a complicated wavelength selection device or a specially-polarized crystal is not needed to introduce or customize, the signal light only exists in the cavity, difference frequency is performed between a multi-seed light source and the signal light to generate the multi-wavelength outputs, and the multi-wavelength intermediate infrared optical parametric oscillator is simple in structure and stable and reliable in performance, and is easy to implement; and parameters such as line width, wavelength, intensity and envelope of the seed light used in the invention are relatively independent, the multi-wavelength intermediate infrared optical parametric oscillator is high in expansibility, many laser outputs in different types can be achieved, and a plurality of laser wavelength generated are stable and controllable in number, intensity and frequency interval.

The invention relates to a double-frequency radial continuous wave Terahertz inclined injection pipe which comprise an axially symmetrical metal top plate, an axially symmetrical metal base plate, two sector-shaped electron beams, two sector-shaped metal flat slow wave structures, a coaxial output waveguide outer cylinder, a coaxial output waveguide inner cylinder, an axially symmetrical collector electrode and an external magnetic field generator; the external magnetic field generator generates a static magnetic field along radial and axial direction in a high-frequency interaction region, under guidance of the static magnetic field, the two sector-shaped electron beams are transmitted along the reverse of the radial direction, and interact with the two sector-shaped metal flat slow wave structures of different structural parameters respectively to convert kinetic energies of the two sector-shaped electron beams into electromagnetic wave energies in two different frequencies, electromagnetic waves in the two frequencies are radiated by the coaxial output waveguide, electromagnetic wave output in two different frequencies can be generated simultaneously, and the whole working frequency and tuning range of the pipe are broadened.

The invention relates to a narrow-linewidth and fast-tuning 2120nm laser light source for hydrogen remote sensing detection, and the light source comprises a pumping source, a collimation focusing system and a resonant cavity which are sequentially arranged along a light path, wherein the resonant cavity comprises an input mirror, a nonlinear optical crystal, an FP etalon and a VBG; the pump lightoutput by the pump source passes through the focusing system and the input mirror and then is focused on the non-linear optical crystal, the non-linear optical crystal is pumped, light oscillation isformed in the resonant cavity, and signal light and idler frequency light are generated. The FP etalon and the VBG are sequentially used for locking the signal light and compressing the line width ofthe signal light, so that the signal light oscillates in the resonant cavity and is not output, and the resonant cavity only outputs 2120 nm idler frequency light. The laser light source provided bythe invention can output 2120nm idler frequency light with high power and narrow linewidth, can realize rapid tuning, and meets the requirements of hydrogen remote sensing detection.

The invention relates to a modularization fast mounted finished product door, and the modularization fast mounted finished product door comprises brackets independent with one another, a panel, an upper beam, a lower beam, adjusting parts, hanging parts fixed to the back of the panel, the bracket comprises a rear pillar fixed to the wall and a front pillar used for fixing the panel, the rear pillar is opened with vertical long round holes for adjusting the bracket vertically, the adjusting code comprises a vertical plate and a support surface, the adjusting parts can be fixed to the sides of the upper end and lower end of the front pillar of the steel bracket by front-back movement and rotation through the vertical plate, the upper beam and the lower beam are respectively fixed with the adjusting part support surface at the upper end and the lower end of the front pillar; the hanging parts are fixed to the upper beam and the lower beam in a left and right adjustable mode. The defects of the conventional manufacturing and installing technology for door head (signage) can be solved through a group of multi-dimensional self-location combined steel system, the modularization fast mounted finished product door is high in modularization production efficiency, weldless in construction site, short in construction period, high in finished product size precision and reliable in structure strength, the gain can be increased by opening the store in advance.

The invention provides a risk control system optimization method, device and equipment and a storage medium. The method comprises the steps of obtaining the historical transaction data of a user; simulating operation of a target risk control system based on the historical transaction data to obtain a simulation operation result of the target risk control system; determining an evaluation result ofthe target risk control system according to the simulation operation result; and determining whether to adjust the risk control system according to the evaluation result. According to the embodimentof the invention, the timeliness of putting the existing risk control system into use can be improved.

The invention relates to the field of detection devices, in particular, a flexible wheel virtual assembly detection device. It is used to detect the position of a flexible wheel mounting hole. The utility model comprises a measuring body. The measuring body comprises an upper template, a lower template, a plurality of guide posts, a center pin, a plurality of positioning pins and a plurality of latches. A plurality of guide posts is arranged equidistantly on the lower template. The upper template is directly facing the lower template. The upper template is fixed on one end of the guide post. Aplurality of latches is movably arranged equidistantly on the lower template. One end of the latch can selectively pass through the upper template. The center pin is detachably disposed in the middleof the upper template and passes through the upper template. A plurality of positioning pins is arranged on the upper template and on the same circumference as the latches. The flexible wheel virtualassembly detection device adopts a split design different from the traditional integrated pitch gauge, and uses a slip-on latch and a removable center pin, making it not easy to get the part stuck inthe workpiece. Firstly, the positioning holes are used to position the mounting holes and then the latches are used to measure one by one. The specific oversize can be visually determined. It is suitable for large-volume products.

The invention provides a sound quality adjustable headphone, which can adjust sound quality without using a tool. A plurality of equiangular ventilation small holes are formed in the periphery of an outer end surface of an outer headphone shell by taking a center hole as a circle center, and the hole diameters of the ventilation small holes increase gradually, a knob is arranged in the center hole, a ventilation large hole is formed in the knob, the ventilation large hole correspondingly ventilates with one of the plurality of equiangular ventilation small holes in the periphery by rotating the knob, the intensity and clarity of bass can be enhanced, and the flavor can be changed with music while the headphone is used for listening.

The invention discloses a fast parameter matching power supply filter combination for providing a power supply filter, which is simple and convenient and is fast and accurate to adjust the parameters.The fast parameter matching power supply filter combination is achieved by the following technical scheme: standard module slots are arranged on a filtering motherboard along the length direction, and each slot has the same internal and external structures; filter standard plug modules of different types and different parameters can be inserted in any standard slot in standard plug module slots;five-port matrix plug devices arranged around the central plug c are arranged on the diagonal line of each filter standard plug module; and a differential mode capacitance and discharge resistance standard circuit, a common mode capacitance standard circuit, a differential mode inductance standard circuit, a common mode inductance standard circuit, a transient voltage suppressor standard circuit,a short connector standard circuit, or at least one standard circuit with different parameters are respectively packaged in the standard plug modules of different types.

The invention provides a phase-sensitive OTDR and a measurement method based on a frequency-domain matching and injection locking technology. The phase-sensitive OTDR includes a pulse light sequence generating device and an echo signal detecting device; the pulse light sequence generating device includes a main laser, a slave laser, an electro-optic modulator, an acousto-optic modulator, an arbitrary waveform generator, an arbitrary function generator and the first circulator; the echo signal detecting device includes a first erbium doped fiber amplifier, a second circulator, a second erbium doped fiber amplifier and a photodetector. The above technology adopts an arbitrary wave modulation injection locking technology to achieve fast tuning of the laser frequency to fundamentally avoid thenonlinear problems in the frequency scanning process and has high-precision sensing capability. The demodulation of the data adopts the frequency domain-space matching technology, and the frequency-domain information of the multi-space domain is matched to significantly reduce the requirement of the data demodulation on the frequency domain points, thereby greatly reducing the requirement on thehardware bandwidth and expanding the measurement range.