8results about How to "Guaranteed SNR" patented technology

This invention discloses a multi-channel programmable miniaturized high-speed FBG demodulation system and method based on an AWG (Optical Fiber Optic Generator), belonging to the field of fiber optic sensing technology. The AWG-based multi-channel programmable miniaturized high-speed FBG demodulation system includes a high-stability broadband light source module, a low-loss isolation module, a miniaturized programmable fiber optic amplifier, a circulator, a two-stage miniaturized high-speed optical switch, a high-crosstalk AWG module, a photoelectric conversion module, a programmable A / D conversion module, and a core control module. The AWG-based multi-channel programmable miniaturized high-speed FBG demodulation method involves the optical signal entering an FBG sensor array, the FBG sensor reflecting the optical signal, the reflected optical signal entering the AWG module, and the output light undergoing photoelectric conversion to calculate the center wavelength of the FBG sensor. This invention, based on an AWG, improves demodulation accuracy while ensuring the demodulation range, achieving continuous wavelength demodulation within the AWG wavelength range.

This application discloses a method, apparatus, electronic device, and storage medium for widening the frequency band of seismic data. The method includes: acquiring a second frequency spectrum with an effective bandwidth from a first frequency spectrum of the original seismic data in a target area; identifying coherent components of the second frequency spectrum at different frequencies; determining the energy weighting coefficients of the coherent components based on the expected bandwidth and effective bandwidth of the original seismic data; performing energy modulation on the coherent components based on the energy weighting coefficients to obtain modulated coherent components; identifying a third frequency spectrum after bandwidth widening based on the modulated coherent components and the second frequency spectrum; and performing time-frequency analysis and inverse transformation processing on the third frequency spectrum to obtain the bandwidth-widened seismic data corresponding to the original seismic data. This effectively widens the frequency band of seismic data while ensuring the signal-to-noise ratio of the seismic data, thereby improving the accuracy of identifying oil and gas target areas.

The invention relates to a multi-target detection method, which comprises the following steps of: based on multidirectional anisotropic filtering, effectively decoupling track main body texture and environmental background noise, and remarkably improving the feature expression capability and the signal-to-noise ratio in a low-contrast and complex texture environment; the fracture area of the track caused under the severe working conditions of partial shielding, light reflection and the like is positioned and repaired, and the connectivity and integrity of the output track on the topological level are guaranteed; by constructing a feasible region mask surrounding an orbit, spatial semantic ambiguity caused by a monocular vision perspective effect is eliminated, it is ensured that foreign matter alarm is strictly limited in a physical dangerous region, and the false alarm rate is greatly reduced. Through simultaneous extraction of the railway track topological structure and troubleshooting of the foreign matter risk in the track area, the detection precision under the complex working condition is significantly improved.

The invention discloses a metasurface-based optical atom magnetic sensor four-channel polarization decoupling detection method, and aims to solve the problems that a detection end of a single-beam atom magnetometer is large in size and is easily interfered by pump light ellipticity fluctuation. The technical scheme of the invention is as follows: a four-channel focusing metasurface device integrated with a sub-aperture pseudo-random spatial multiplexing nano-pillar array is utilized to replace a discrete component in a traditional detection light path, and a single beam of detection light carrying magnetic field information is directly separated in space and is focused into four independent light spots of left rotation, right rotation, 45 degrees and 135 degrees at the same time; common-caliber uniform sampling of the Gaussian beam cross section is realized through pseudo-random arrangement; the signal processing system inverts the ellipticity of the pump light in real time by using a circular polarization channel, extracts a magnetic field signal by using a linear polarization channel, and performs dynamic correction through a full-polarization decoupling algorithm. According to the invention, chip-level integration of the magnetometer is facilitated, and high-sensitivity and high-stability anti-interference measurement is realized.

The embodiment of the invention provides an image acquisition method, an image acquisition device and electronic equipment, which are used for solving the problem that the image quality and the information integrity are influenced in related technologies. The image of the shooting scene is divided into the preset number of blocks, the bright blocks and the dark blocks are determined according to the bright region threshold value and the dark region threshold value, the first average value of the brightness of the pixel points of each bright block and the second average value of the brightness of the pixel points of each dark block are calculated, and the scene dynamic value is obtained through the ratio of the first average value and the second average value. The scene dynamic value can reflect the brightness difference degree of the bright area and the dark area of the shooting scene. The method comprises the following steps: determining a first exposure ratio of a long frame to a middle frame and a second exposure ratio of the middle frame to a short frame according to a scene dynamic value, adjusting exposure parameters of the middle frame and the short frame, ensuring that the long frame, the middle frame and the short frame cover a complete dynamic range from a dark part to a bright part, avoiding information loss, and determining exposure parameters of the long frame according to target brightness so as to improve the image quality. The problems of bright area overexposure and dark area underexposure can be effectively solved, and the image quality is improved.

The invention discloses a dental X-ray tomography system and method based on an intelligent mechanical arm, and relates to the technical field of medical imaging.The method comprises the steps that a high-precision three-dimensional point cloud model of an oral cavity target area is obtained through structured light three-dimensional scanning; generating a collision-free optimal scanning path sequence and a theoretical pose based on the model; controlling the mechanical arm to carry the X-ray source to move along the optimal path and synchronously triggering exposure and image acquisition; the actual pose and the projected image quality of the tail end of the mechanical arm are monitored in real time, and a double-feedback closed loop is formed; calculating a pose compensation instruction and dynamically adjusting exposure parameters; and executing a three-dimensional iterative reconstruction algorithm by using the accurate geometric parameters to generate a cross-sectional image and three-dimensional body data. According to the invention, self-adaptive scanning track planning, dynamic pose error correction, millisecond-level self-adaptive dose regulation and control and end-to-end full-automatic workflow can be realized, the spatial resolution and geometric fidelity of a reconstructed image are remarkably improved, and the radiation dose of a patient is reduced.

The application provides a communication method, device, network equipment, terminal, equipment, medium and product, and relates to the technical field of communication, wherein a base station receives reference signal configuration information; according to the reference signal configuration information, a reference signal is generated and sent on at least one symbol; the reference signal configuration information is used for indicating resource configuration of the reference signal, and the reference signal configuration information satisfies the following conditions: the reference signal has a repeated resource unit occupation mode in each resource block in the same cell; a plurality of resource units of the reference signal allocated to the cell are arranged at equal intervals in the frequency domain in a single resource block; all resource units in the resource block are allocated to the reference signal of one or more cells in each resource block in which resources are allocated to the reference signal; when the reference signal is allocated to a plurality of cells, the reference signals allocated to different cells occupy different resource units. The reference signal of the application can take into account the sensing service and fully improve the spectrum resource utilization rate.

The utility model relates to the technical field of packaging paper feeding and cutting, and discloses a paper material deviation identification structure of chain type transmission paper feeding equipment, which comprises a reinforcing plate arranged on a rack, a connecting frame is arranged on one side of the reinforcing plate, transparent plates are arranged at two ends of one side, close to the reinforcing plate, of the connecting frame, and the transparent plates are connected with the reinforcing plate. A connecting plate is arranged on one side of the transparent plate, a camera module is arranged on the lower portion of the transparent plate, and the camera module completes paper deviation recognition by shooting position limit points of paper. According to the utility model, the identification camera moving platform which is synchronously driven by the double-side offset transmission motor and is matched with closed-loop control is adopted to realize + / -0.1 mm level real-time position tracking and capture 2000fps high-speed displacement change, the rotary cylinder drives the light shielding plate and the identification camera to form time sequence linkage, and the ambient light interference is reduced to below 50Lux by dynamically adjusting the light shielding angle, so that the real-time position tracking is realized. And the signal-to-noise ratio of the image is not less than 35dB.