9results about How to "Achieve modulation" patented technology

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 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.

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.

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 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 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.