26results about How to "Achieve modulation" patented technology

The invention provides an optical switch, an optical switch assembly and an optical switch integrated component, and belongs to the technical field of optical communication. The optical switch provided by the invention comprises an input waveguide, a multi-mode waveguide and a plurality of output waveguides which are connected in sequence, the optical switch further comprises a plurality of strip-shaped electrodes located on one side of the multi-mode waveguide, and the plurality of strip-shaped electrodes can modulate an optical field propagation path in the multi-mode waveguide. The optical switch adopts a planar waveguide structure, and an optical field propagation path in the multimode waveguide can be modulated through the electrodes, so that the structure of the optical switch is effectively simplified, and the number of output ports is convenient to expand. Moreover, the optical switch adjusts the refractive index distribution of the multi-mode waveguide through the electrode, so that modulation of a light field propagation path is realized, the working range of the input wavelength of the optical switch is not limited, and wide-wavelength working can be realized.

The invention relates to an explosion impact test technology, in particular to a solid / gas two-phase explosive wave driven aircraft ground test device and method, and the solid / gas two-phase explosive wave driven aircraft ground test device comprises an anti-static floor, a gas distribution system, a test system, a solid explosive fixed initiation device and a tunnel system, the tunnel system comprises a fixed support, a tunnel, a gas circulator, a first gas exchange pipeline and a second gas exchange pipeline, the gas distribution system comprises a high-pressure gas tank, a high-pressure methane gas cylinder and an air exchanger, and the test system comprises an electronic exploder, a pressure sensor and a flame sensor. Modulation of different overpressures and different durations can be carried out by controlling the solid charge amount, the gas concentration, the solid explosive charge amount, the solid explosive type and the like, the overpressure peak value and the duration of explosion shock waves are adjustable and controllable, and the requirement that external loads of an aircraft continuously change in different flight environments is met.

The invention relates to the technical field of reconfigurable transistors, in particular to a reconfigurable transistor for modulation based on TENG and UV light and a method. The invention provides a reconfigurable transistor for modulation based on TENG and UV light. The reconfigurable transistor comprises a transistor assembly, a TENG assembly and a UV light assembly. According to the invention, the TENG and the transistor are coupled, the UV light is introduced for cooperation, the TENG is utilized to initiate charge movement, the UV light is cooperated to generate a photoelectric reaction on the transistor, and the type and concentration of carriers are regulated and controlled so as to realize modulation of the channel layer, and the method has good regulation and control characteristics. The reconfigurable transistor solves the problem that the polarity of an existing reconfigurable transistor is not easy to regulate and control.

The embodiment of the present invention discloses an optical signal sending device, including an optical modulator, a differential driver, and a phase modulator, wherein the optical modulator includes an optical input end, a first modulation area, a connection area, a second modulation area, and an optical output end; the first modulation area includes a first modulation arm and a second modulation arm, the second modulation area includes a third modulation arm and a fourth modulation arm, and each modulation arm includes an optical waveguide and electrodes on both sides thereof. The modulation of the photoelectric signal is realized by driving the two modulation areas with a differential drive signal, and the stacked arrangement of the modulation arms greatly reduces the volume of the optical modulator, thereby facilitating the miniaturization of devices and equipment.

The invention relates to a microwave source device in the technical field of high-power microwaves, in particular to an L-band compact relativistic Cerenkov microwave generating device, and belongs to the technical field of high-power microwaves. Comprising a cathode structure, an external electromagnetic structure and an internal electromagnetic structure, and the cathode structure comprises a cathode seat and a cathode; the external electromagnetic structure comprises an anode outer cylinder, an outer cut-off neck, outer conductor ripples, a collector, a collector baffle and a solenoid coil; the internal electromagnetic structure comprises an inner cut-off neck, an inner conductor ripple, a short circuit block and a microwave output port; the whole structure is rotationally symmetrical about a central axis; through reasonable design of an electromagnetic structure, a coaxial non-uniform double-ripple slow-wave structure is adopted to enhance beam-wave coupling, a high-efficiency beam-wave effect is realized in a relatively short period, and a coaxial collector structure is adopted to improve the resonance characteristic of the slow-wave structure to reduce the axial size, so that miniaturization and compactness of the device are realized.

This invention discloses a eutectic material with ion-stimulated fluorescence response and its preparation method. The eutectic material is a co-crystallized compound formed by a fluorescent cyclophenone and a crown ether through a host-guest interaction. The eutectic material and its preparation method provided by this invention utilize a fluorescent cyclophenone as the host and a crown ether as the guest, and the two are combined through a host-guest interaction to obtain the eutectic material. This material not only possesses ion-stimulated fluorescence response characteristics but also has advantages such as high spatiotemporal resolution and good sensitivity.

The invention discloses a device and a method for adjusting PLL (Phase Locked Loop) loop bandwidth based on VCO (Voltage Controlled Oscillator) working voltage. The device comprises a phase frequency detector, a digital filter, a digital oscillator and a frequency divider, the phase frequency detector is used for comparing the input signal with the output signal to obtain an error signal; the digital filter is used for processing the error signal; the digital filter comprises a proportional path; the digital oscillator is used for generating an output signal based on the processed error signal; the digital oscillator comprises a switch variable capacitor array; the switch variable capacitor array is used for adjusting the working voltage of the digital oscillator based on the error signal; the proportion path is directly connected with the phase frequency detector and the switch variable capacitor array; the frequency divider is used for carrying out frequency division on the output signal and feeding back the output signal to the phase frequency detector; by modifying the gain coefficient of the proportional path in the phase-locked loop, the adjustment of the loop bandwidth is realized, and the adjustment flexibility is improved.

The utility model relates to fish culture equipment technical field discloses a multilayer formula water circulation pool equipment for freshwater fish interim culture, including support, the top and inboard bottom of support all are fixedly connected with pool body, the inboard bottom of two pool bodies all is provided with oxygenation mechanism, the bottom right side of two pool bodies all is provided with filter mechanism, the top left side front of support is provided with sterilization mechanism, the sterilization mechanism is used for the disinfection of fish pond, the bottom right side of two pool bodies all is provided with sewage treatment mechanism, the sewage treatment mechanism is used for cleaning the sludge accumulation, the front side of two pool bodies all is provided with observation mechanism, the sewage treatment mechanism includes two baffle. In the utility model, the top sludge falls to the filter frame and is stopped by the filter screen to realize separation, opens the electromagnetic valve to discharge pool water after plugging back the baffle, the cleaning work of isolation type, avoid producing local strong water flow to disturb fish, guarantee the normal growth and interim culture quality of fish.

The imaging method based on a large-capacity spatial multiplexing metasurface disclosed in the present invention relates to a single-pixel imaging method based on a large-capacity spatial multiplexing metasurface, and belongs to the field of micro-nano optics and single-pixel imaging application technology. The implementation method of the present invention is: using a metasurface with a randomly distributed nanopore structure as a mask in a single-pixel imaging system, it is possible to achieve fast and high-resolution imaging without polarization selection, and its working range can be from the entire visible light to the near-infrared band; by switching the mask pattern by moving the metasurface, it is possible to achieve spatial multiplexing, obtain more mask patterns in a limited spatial area, and improve the information capacity of the metasurface. The present invention can achieve fast and high-resolution single-pixel imaging from the visible light to the near-infrared band. The single-pixel imaging system based on the metasurface is small in size and simple in optical path, which can make the imaging system more compact and integrated, and broaden the application range of the single-pixel imaging system.

The utility model provides a special-shaped vehicle lamp light guide assembly and a vehicle. The special-shaped vehicle lamp light guide assembly comprises a light guide plate and a light guide plate, internally assembling a mirror; the light guide plate is arranged opposite to the inner lens, and the light guide plate is provided with a low beam end and a high beam end; the light guide plate comprises a light guide plate body and at least one light mixing gain structure on the side, away from the inner lens, of the light guide plate body, and the light mixing gain structure is connected with the low beam end and the high beam end. In the direction from the near light end to the far light end, the bending state of the light mixing gain structure is matched with the shape of the light guide plate; and the light source is arranged at the near light end of the light guide plate. According to the LED atmosphere lamp, the problem that obvious brightness difference occurs due to the design when a large included angle exists between the incident light direction of the LED particles and the modeling trend of the atmosphere lamp is solved.

The application provides a GaN-based HEMT device with a multi-gate structure and a preparation method thereof. A corresponding gate pattern is defined by forming a plurality of dummy gates, and a gate is formed in a gate groove after the dummy gates are removed, so that AlGaN barrier layers with different thicknesses are arranged under the plurality of gates without thinning the barrier layers by etching, and thus damage caused by etching is avoided. The GaN-based HEMT device provided by the application comprises a plurality of AlGaN barrier layers, a plurality of gate grooves arranged at intervals, and a gate arranged in the plurality of gate grooves. The AlGaN barrier layers are arranged in pairs with the gates arranged thereon. By arranging the barrier layers with different thicknesses under the plurality of gates, a plurality of gates with different threshold voltages can be formed in the same device, so that modulation of the threshold voltage is realized.

The application provides a Mach-Zehnder electro-optical modulator and a modulation method. The modulator comprises a silicon substrate layer, a first silicon dioxide layer is arranged on the silicon substrate layer, a first coplanar waveguide electrode is embedded in the first silicon dioxide layer, a waveguide layer is arranged on the first silicon dioxide layer, and the first coplanar waveguide electrode and the waveguide layer are in contact. A second coplanar waveguide electrode is arranged on the surface of the waveguide layer away from the first silicon dioxide layer, and a second silicon dioxide layer is coated in the gap formed by the waveguide layer and the second coplanar waveguide electrode. The first coplanar waveguide electrode and the second coplanar waveguide electrode are supplied with voltage signals of the same frequency and the same phase.

A multi-format compatible space laser communication receiving device and method belongs to the field of free space optical communication technology. In order to solve the problem of high complexity and high maintenance cost of the existing system, and facing the problem of poor applicability of dynamic channel characteristics in the space laser communication system, the signal source of the device is connected to the IQ modulator through a radio frequency line, the C-band tunable laser is connected to the IQ modulator through an optical fiber, the IQ modulator is connected to the power amplifier, the power amplifier is connected to the transmitting antenna through an optical fiber, the transmitting antenna and the receiving antenna are wirelessly transmitted, the receiving antenna is connected to the optical fiber coupler through an optical fiber, the optical fiber coupler is respectively connected to the preamplifier and the optical power module through an optical fiber, the preamplifier, the photodetector, and the analog-to-digital converter are connected in turn through optical fibers, the analog-to-digital converter and the FPGA are connected with an radio frequency line, and the optical power module and the temperature pulsator are respectively connected to the FPGA through a USB data line. While meeting the requirements of multi-format compatible reception and high speed, the requirements for system hardware are reduced, the cost is low and the reliability is high.

The present invention discloses a high temperature resistant optical fiber and a manufacturing method thereof, wherein the high temperature resistant optical fiber includes an outer package structure, a heat isolation structure, an inner package structure and a hollow core structure from the outside to the inside. The present invention adopts a hollow structure, has a strong resistance to electromagnetic interference, stable and reliable signal transmission, relatively low optical loss, can effectively reduce signal attenuation, improve transmission efficiency, and is not easily affected by heat to cause a decrease in signal transmission quality. In addition, a spirally distributed silica photonic crystal is arranged on the outer surface of a hollow pipe of the hollow core structure, which can change the phase distribution of the optical signal, realize phase regulation and modulation of the optical signal, and expand the function and performance of the optical fiber system. In addition, a mixed gas formed by argon and helium is filled inside the hollow pipe, which can adjust the properties of the filling gas, balance thermal conductivity and thermal expansion effect, so as to meet the needs in a specific high temperature environment.

The application discloses a three-level topology modulation control method, system and device and a storage medium, and relates to the control field of power electronic technology. In the scheme, the trigger condition for switching between each carrier mode modulation mode is determined based on each carrier mode modulation mode, and when the trigger condition for switching from the current carrier mode modulation mode to the target carrier mode modulation mode is met, the driving waveform after the carrier of the target carrier mode modulation mode is modulated based on the target modulation wave is used to control the three-level topology, that is, by switching the carrier mode modulation mode, different carrier mode modulation modes are selected for modulation control in the full modulation ratio range. It can be seen that, in the application, the carrier mode modulation mode with the best common-mode voltage suppression effect is selected at different modulation ratios according to the common-mode voltage suppression conditions of different carrier mode modulation modes in the full modulation ratio range, so that the common-mode voltage suppression in the full modulation ratio range is realized.

The application discloses a SAR composite phase modulation jamming method based on a phase-adjustable metasurface, and relates to the technical field of signal processing.The phase-adjustable metasurface designed by the application adopts a multi-layer metal base and a design of a butterfly-shaped structure unit, so that the whole structure is compact and easy to be integrated into the surface of a protected target, and a varactor diode is introduced as a control element; by changing the voltage applied to the two sides of the first butterfly-shaped structure unit and the second butterfly-shaped structure unit, the equivalent capacitance of the varactor diode can be controlled in real time, and then the continuous change control of the phase of the incident electromagnetic wave is realized; by only designing the first butterfly-shaped structure unit and the second butterfly-shaped structure unit with high matching degree, and simultaneously controlling the equivalent capacitance of the varactor diodes on the first butterfly-shaped structure unit and the second butterfly-shaped structure unit, the continuous phase modulation of the incident electromagnetic wave is realized, and the modulation accuracy of the control metasurface when modulating the electromagnetic wave is greatly improved, so that the effect of jamming the SAR radar is improved.

The utility model provides a color wheel structure and optical equipment, and the color wheel structure comprises a driving group which comprises at least two independent driving mechanisms, and the driving mechanisms are arranged in a linear array along a first direction; the optical filter group comprises at least two optical filters, and the optical filters and the driving mechanism are sequentially and correspondingly arranged; the optical filter group is positioned above the driving group and is driven by the driving group to reciprocate along a second direction; the cover body is located above the optical filter set, a light inlet and a light outlet are formed in the two opposite end faces, in the first direction, of the cover body respectively, and when the optical filters move to an inner cavity of the cover body, light rays penetrate through the optical filters from the light inlet, are modulated by the optical filters and then escape from the light outlet. According to the technical scheme, the telescopic color wheel module is designed by changing the mechanical operation mode of the rotary color wheel, and the problems that an existing color wheel is poor in heat dissipation, poor in modulation precision and the like are fundamentally solved.

This invention relates to a method for fabricating an electrically driven active VO2 / MXene metasurface terahertz modulator, utilizing a vacuum filtration method to prepare an MXene thin film. The MXene metasurface is fabricated using a laser direct writing method. A vanadium dioxide thin film is fabricated using magnetron sputtering. The vanadium dioxide thin film on a quartz substrate is completely immersed in a buffered oxide etchant (BOE). Using the prepared MXene metasurface, a self-supporting vanadium dioxide thin film is retrieved from water, suspending the vanadium dioxide film on the MXene metasurface. The VO2 / MXene composite metasurface is then left to stand for 1 hour to allow them to bond and dry, resulting in the VO2 / MXene composite metasurface. The MXene metasurface offers advantages such as high flexibility and ease of fabrication. The VO2 / MXene terahertz modulator features actively controllable terahertz waves, high modulation depth, and low trigger power.

The embodiment of the invention provides a polarization modulation assembly, a laser power stabilizer and a polarization modulation method, and relates to the technical field of laser. The polarization modulation assembly comprises a polarization grating, a lens, a phase delay wave plate and a reflector which are sequentially arranged, the polarization grating can split incident linearly polarized light into left-handed polarized light and right-handed polarized light, and the left-handed polarized light and the right-handed polarized light sequentially pass through the lens and the phase delay wave plate and then are incident to the reflector. The left-handed polarized light and the right-handed polarized light are reflected to the polarization grating through the reflector, the left-handed polarized light and the right-handed polarized light which are focused and reflected are combined through the polarization grating to obtain modulated polarized light, the response speed is high through the polarization grating, the polarization state of light can be accurately controlled, and laser modulation is achieved. In addition, the polarization modulation assembly provided by the embodiment of the invention is simple in structure, and is suitable for various scenes where the laser power needs to be rapidly adjusted.

The invention relates to the technical field of reconfigurable transistors, in particular to a CMOS-like inverter constructed based on a reconfigurable transistor and a modulation method of the CMOS-like inverter. The invention discloses a CMOS-like inverter constructed based on a reconfigurable transistor. The CMOS-like inverter comprises a transistor assembly and a TENG assembly. The heterogeneous transistor part and the standard field effect transistor part are formed in the transistor assembly through a multilayer design, and the TENG is coupled with the transistor assembly, so that on one hand, the TENG is utilized to initiate charge movement and modulate the standard field effect transistor part, and on the other hand, the TENG is utilized to initiate charge movement and cooperate with UV light to generate photoelectric reaction on the heterogeneous transistor part, so that the modulation efficiency is improved. And the type and the concentration of the current carriers are regulated and controlled so as to modulate the heterogeneous transistor part, so that the N-P type or P-N type CMOS phase inverter is modulated. According to the CMOS-like inverter, modulation can be carried out according to requirements, and direct interaction between external motion and a device is achieved.

The invention discloses a stoichiometric lithium tantalate crystal-based electro-optical scanner, which comprises a laser, a polarizing film, a stoichiometric lithium tantalate crystal, a driving circuit, an optical lens, a filter and a receiver which are sequentially connected from left to right, and is characterized in that a laser beam of the laser is incident from the Y-axis direction of the stoichiometric lithium tantalate crystal; the front face and the back face of the stoichiometric ratio lithium tantalate crystal in the Z-axis direction are provided with periodic triangular ferroelectric domain structures, the stoichiometric ratio lithium tantalate crystal is provided with a top face and a bottom face which are parallel to each other in the X-axis direction, the top face and the bottom face are both plated with metal electrodes, and the driving circuit is connected to the metal electrodes. And an external electric field is applied to the stoichiometric lithium tantalate crystal in the X-axis direction. According to the electro-optical scanner based on the stoichiometric lithium tantalate crystal, on the basis that it is ensured that the electro-optical scanner has a large electro-optical modulation angle, the manufacturing cost and manufacturing difficulty of the electro-optical scanner are effectively reduced, and high practicability is achieved.

The invention discloses a terahertz metamaterial device for realizing an EIT-like phenomenon by coupling a bright mode and a dark mode, and belongs to the technical field of terahertz application. The terahertz metamaterial device comprises a substrate layer and patterned resonator layers which are periodically arranged on the substrate layer. The patterned resonator layer is formed by combining a bright mode resonator of a cross structure and four strip-shaped short arm structure dark mode resonators, electromagnetic fields are enabled to generate destructive interference through near-field coupling between a bright mode and a dark mode so as to realize an EIT-like phenomenon, and a transparent window with the transmissivity of 86.5% is generated at 1.588 THz. One patterned resonator layer and the substrate layer form a structure period, one structure period P is 25 [mu] m, and the terahertz metamaterial device is an array formed by splicing a plurality of structure periods. The optical device can be used as a four-frequency asynchronous optical switch device, a sensor, a modulator, a slow light device and other optical devices.

The application provides a power tube driving circuit and a driver. The driving circuit comprises a transmission gate driving module, a transmission gate module, a bootstrap module and a power tube; a first end of the bootstrap module is used for connecting a first power supply, a second end of the bootstrap module is connected to a control end of the power tube, and the bootstrap module is used for driving the power tube; a first end of the transmission gate driving module is used for receiving a pulse signal, a second end of the transmission gate driving module is connected to a control end of the transmission gate module, and the transmission gate driving module is used for driving the transmission gate module to be in a conduction state or an off state according to the pulse signal; an input end of the power tube is used for connecting a second power supply, an output end of the power tube is connected to an input end of the transmission gate module, and an output end of the transmission gate module is used for connecting a to-be-driven device. The application can reduce device failure caused by a signal and improve the stability of signal transmission.

The invention discloses a preparation method of a nanowire for strengthening gas turnover and application of electrocatalytic ammonia synthesis. The problems of slow reaction kinetics, low current density, high overpotential and the like are caused by hydrogen microbubbles generated by a local hydrogen evolution reaction in a nitrate reduction synthesis ammonia process to hinder contact between active sites and electrolyte. In order to solve the problem, cation-philic sites are formed on the surfaces of the transition metal nanowires through a phosphorus embedding strategy, local cation enrichment is modulated to improve microbubble interfacial tension, local bubble turnover is enhanced, high-activity catalytic sites on the surfaces of the nanowires are formed, and the electro-catalysis nitrate reduction reaction performance is improved; the ammonia synthesis with high current density, high selectivity and long-time stability is realized. The synthesis method is simple, rapid and high in expansibility, nanowire structures for strengthening gas turnover can be formed on different transition metals by improving substrate conditions, the catalytic effect is remarkably improved, and the method can be applied to various solid-liquid two-phase electro-catalytic reactions and has a good application prospect.

The application discloses a kind of multimodal modulatable flexible sensors and its modulation method, preparation method, it is related to sensor technical field, the flexible substrate layer of the sensor is by bottom to top sequentially deposited bottom electrode, intermediate composite functional layer and top sensitive layer;Bottom electrode and intermediate composite functional layer constitute intermediate layer;First filling layer is deposited on the side of intermediate layer;Second filling layer is deposited on the other side of intermediate layer;First electrode is deposited on first filling layer;Second electrode is deposited on second filling layer;First electrode and second electrode are in contact with top sensitive layer.The application not only can realize the independent perception of multimodal, but also can realize the online modulation of sensing performance, improve the adaptability and sensitivity of sensor while simplifying structure, facilitate integration.

This invention provides a multi-factor coupled temperature field simulation method for land scenes, relating to the field of infrared scene simulation technology. The method includes: first, based on a ground object heat transfer model, statistically analyzing the temperature variation patterns of ground cover and vegetation under different environmental parameters, and extracting multi-factor coupled temperature field modulation parameters; second, segmenting ground object regions in visible light remote sensing images using cluster analysis to generate ground cover marker textures; subsequently, constructing a 3D land scene with a vegetation interface using a procedural vegetation generation method based on the marker textures; finally, importing the modulation parameters and the 3D scene into a rendering engine, and determining shadow areas based on environmental parameters such as sunlight, altitude, and wind field, combined with a ray projection self-intersection algorithm, to achieve real-time temperature modulation of the 3D land scene and individual vegetation. This invention solves the problems of insufficient physical basis for temperature modulation, imprecise shadow judgment, and lack of vegetation cover in existing technologies.