7results about How to "Compensation loss" patented technology

The present application relates to the field of microwave photonics, and more particularly to a high linearity microwave photonics down-conversion receiving system based on an optoelectronic oscillator. The system comprises a laser, a first phase modulator, a first optical amplifier, a phase-shifted Bragg grating, a first photodetector, a second phase modulator, an optical filter, a second optical amplifier, and a second photodetector. The frequency of the local oscillator signal generated by the first photodetector can be tuned by changing the frequency of the laser, thereby effectively realizing the tuning of the down-converted signal output by the second photodetector. By adjusting the gain value of the first optical amplifier, the amplitude of the local oscillator spectral harmonic in the output optical signal of the first phase modulator is a specific value, thereby realizing the suppression of the third-order intermodulation distortion in the output signal, and further improving the spurious-free dynamic range of the entire down-conversion receiving system. The system has reconfigurability and high linearity, and can play a technical value in the field of radar and communication applications.

This invention relates to the field of infant clinical care and home care technology, specifically to an intelligent temperature-controlled infant bathing and protective care device. The device includes a main control display panel, a faucet, a bathing platform, a bathing tub, a closed-loop temperature-controlled water supply system, and a drain outlet. A liquid level monitoring and calibration component is installed on the top of the bathing platform and is electrically connected to the main control display panel. This invention achieves precise heating and constant temperature maintenance of the water through the closed-loop temperature-controlled water supply system. Combined with the liquid level monitoring and calibration component, it monitors the liquid level in the bathing tub in real time. When the water level reaches a preset target value, the main control display panel automatically triggers the closed-loop temperature-controlled water supply system to stop supplying water. This achieves precise matching of safe water levels for infants of different ages, significantly reducing the workload for medical staff and caregivers when simultaneously caring for the infant and adjusting parameters, and improving the safety and comfort of the infant bathing process.

The present application relates to a kind of wideband active phase shifter based on inductive compensation, including input balun, quadrature signal generator, inductive compensation network, adder and output balun in series in turn, and 7-bit DAC connected with adder, can realize 360 ° phase shift range;The input balun and output balun all adopt two-stage differential active balun structure;The quadrature signal generator is three-stage Type-II PPF;The inductive compensation network is used to generate peak gain at high frequency point, widen working frequency band and do not affect phase shift accuracy;The adder adopts Gilbert unit and controls phase change by digital signal input mode;7-bit DAC is used to provide different bias voltage for Gilbert unit, to control current size and realize vector modulation.The present application introduces inductive compensation network between quadrature signal generator and vector modulation unit, effectively widen working bandwidth, realize gain flattening, while maintaining high phase shift accuracy and low amplitude error.

The application discloses a low-strain silicon-carbon negative electrode material and a preparation method thereof. The preparation method comprises the following steps: S100, synthesizing MgV2O6 products from a magnesium source and a vanadium source; S200, mixing porous carbon and the MgV2O6 products to obtain a base material; and S300, performing vapor deposition on the outer surface and the pores of the base material by using a silane gas source and a carbon gas source in an inert gas to obtain a silicon-carbon negative electrode material. The MgV2O6 with a stable crystal structure is prepared from the magnesium source and the vanadium source, and rigid support is provided in the subsequent preparation process, so that the use stability and the thermal stability are improved. The silane gas source and the carbon gas source are vapor-deposited on the base material to generate silicon-carbon active substances in situ, so that the silicon atoms, the carbon atoms and the carbon atoms on the surface of the base material form firm chemical bonds, the stress generated when the silicon expands is absorbed by the internal structure of the silicon-carbon negative electrode material, and thus the silicon-carbon negative electrode material with high use stability is prepared.

The application discloses a kind of optical fiber hydrophone array remote transmission system and method, system includes the optical emission module of dry end, optical receiving module, Raman pumping unit and state management unit, and the relay amplifier and optical fiber hydrophone array of wet end;Optical emission module is amplified to power pre-emphasis downlink multi-wavelength laser pulse power;Optical receiving module restores sound field information to uplink multi-wavelength interference optical signal;Relay amplifier is amplified after input optical fiber hydrophone array to downlink multi-wavelength laser pulse, uplink multi-wavelength interference optical signal is amplified after input optical receiving module;Raman pumping unit outputs multi-wavelength Raman pump light, and the uplink multi-wavelength interference optical signal of relay amplifier output is carried out reverse distributed fiber Raman amplification;State management unit is configured different wavelength Raman pump laser power for Raman pumping unit;Optical fiber hydrophone array receives downlink multi-wavelength laser pulse, and outputs multi-wavelength interference optical signal carrying sound field information.

The application discloses a near-transform limit nanosecond pulse mode-locked fiber laser with periodic bifurcation and a producing method. The laser is a fiber ring cavity which comprises a wavelength division multiplexer, an erbium-doped fiber, a first polarization controller, a polarization detector, a dispersion control unit, an output coupler, a fiber isolator and a second polarization controller which are connected in sequence in a closed loop. The method comprises the following steps: coupling pump continuous light into the laser through the wavelength division multiplexer; absorbing the pump continuous light by the erbium-doped fiber and radiating gain pulses in a long-wave band; oscillating the generated pulses in the fiber laser cavity; through the cooperation of the first polarization controller, the polarization detector and the second polarization controller, generating equivalent saturated absorption effect by using the nonlinear polarization rotation generated when the gain pulses propagate in the fiber, and realizing pulse mode-locking; and making the fiber laser work in an abnormal dispersion region so that the generated pulses satisfy the soliton area theorem and near-transform limit pulses are generated. The application can realize nanosecond pulse periodic bifurcation output of a short-cavity fiber laser.

The application discloses a target segmentation method and device, electronic equipment and storage medium, and belongs to the technical field of image processing. In the method, for a target image collected underwater, a segmentation model performs target segmentation after image enhancement by an enhancement network. The enhancement network separates the target image on each color channel of RGB, extracts features of an initial feature map on each color channel after the separation, splices the extracted feature maps, obtains a feature map of the target image on multiple feature channels, and performs image enhancement on the target image based on the feature map of the target image on the multiple feature channels and weights of each feature channel. The weight determination rule includes that the weight of the feature channel corresponding to the R color channel is greater than the weights of the feature channels corresponding to the G color channel and the B color channel. In this way, the feature information of the R color channel can be highlighted, the missing image details due to the lack of red light underwater can be filled, and the accuracy of subsequent target segmentation can be improved.