13results about How to "Improve detection performance" patented technology

The application discloses a hyperspectral remote sensing image constraint collaborative representation anomaly detection method based on global anomaly weighting. A local dictionary is constructed by using a sliding double window, a graph regular term constraint is added on the basis of collaborative representation in order to maintain the local geometric structure in the original data space, a graph constraint collaborative representation model is established, and a global anomaly saliency weight is constructed by using a spectral residual method in order to fully utilize the global features of the hyperspectral remote sensing image. Finally, the established graph constraint collaborative representation model and the constructed global anomaly saliency weight are nonlinearly fused. The application aims at solving the problems of insufficient utilization of the best representation of the to-be-tested image element in the reconstruction model and features, and effectively improves the precision of the hyperspectral anomaly detection by using the graph constraint collaborative representation model and the global anomaly saliency weight.

The invention discloses a high-maneuvering low-speed target take-off and landing process parameterization detection method based on a common inductance signal. The method comprises the steps that a motion model of an aircraft in the take-off and landing stage is built, and a formula modeling result is obtained; obtaining distances and speeds of a plurality of suspicious targets; designing a band-pass filter in a Doppler domain to obtain an LVD result, calculating Doppler frequency information of the target, and obtaining accelerations of a plurality of suspicious targets; calculating retroreflection coefficients of the plurality of suspicious targets based on a radar antenna design principle; based on array antenna arrangement of a sensing system, obtaining space angles of a plurality of suspicious targets, and determining the space position of each suspicious target by combining the distances of the plurality of suspicious targets; and a detection module based on physical characteristics of the moving target is utilized to screen out an aircraft target according to respective threshold ranges of the speed, the acceleration, the retroreflection coefficient and the spatial position of the target. According to the invention, the detection capability of a low-speed and high-maneuverability moving target in a low signal-clutter-noise ratio environment is improved.

The invention discloses a nonmetal pipeline detection positioning device, method and system, and the positioning device integrates a sound generation device, a sound pickup, a main controller and the like through a detection box body, and an operator can carry one detection box body to carry out the detection work of a nonmetal pipeline. The sound generating device and the sound pick-up are used in cooperation, the position of the non-metal pipeline can be accurately determined by emitting the sound with the specific frequency and receiving the echo generated after the sound is transmitted in the non-metal pipeline, and the mode based on sound transmission is not limited by the non-conductive and non-magnetic characteristics of the non-metal pipeline; and the problem of non-metal pipeline detection can be effectively solved. The display device is installed on the detection box body and can display the position information of the nonmetal pipeline in real time. The main controller accurately analyzes and processes sound signals sent by the sound generating device and echo signals received by the sound pick-up, specific signals related to the non-metal pipeline are extracted, and the detection accuracy is improved.

The application provides a trim glass, a column assembly and an automobile, relates to the technical field of glass products, and the trim glass comprises a diffusion layer and a glass body, the diffusion layer has a set roughness and is arranged on one side of the glass body, the thickness of the glass body is 2.1 mm to 3.5 mm, the total iron content of the glass body is 0.00005% to 0.12%, the contents of cobalt, chromium and selenium are substantially zero, and the difference between the millimeter wave loss rates when the trim glass is placed and when the trim glass is not placed is 3.15 db to 5.47 db. The application reduces the metal shielding effect, so that the millimeter wave loss rate when passing through the trim glass is reduced, meanwhile, by adding a certain amount of TiO2, the problem that the coloring effect of the trim glass is deteriorated due to the reduction of metal content and the ultraviolet transmittance is improved is solved. The trim glass can better adapt to the millimeter wave radar and improve the detection performance of the millimeter wave radar.

The invention discloses a concrete crack detection device and detection system, and relates to the technical field of concrete crack detection. Comprising a crack detection mechanism, the crack detection mechanism comprises a detection vehicle, the top of the detection vehicle is fixedly connected with a mounting seat, the bottom of the detection vehicle is provided with electric control driving wheels, and the mounting seat is internally provided with a storage battery; the device can perform crack detection on the concrete pavement, is beneficial to cleaning the concrete pavement, and is convenient to sweep dust at the pavement crack, so that the crack detection and recognition effect is improved, the detection and use effects of the device are improved, and meanwhile, the concrete crack can be detected and recognized; according to the detection device, pavement cracks and internal cracks can be accurately detected, images and crack width and depth data during detection can be transmitted to the detection display equipment to be displayed, detection personnel can conveniently analyze and record the cracks, and the detection and recognition accuracy of the detection device is improved.

An electronic sentinel and its regional joint defense system include a main detection unit, a main control module, and at least one electronic sentinel unit. The main detection unit includes a detection unit and a communication module. The electronic sentinel unit includes a mobile pack, an optical scanning head, a communication module, a main control board, a transmitting unit, a positioning module, and an automatic omnidirectional deflection unit. The electronic sentinel unit can be mounted on a mechanical vehicle or carried by personnel via the mobile pack. A communication link enables information sharing between the units. The automatic omnidirectional deflection unit compensates for attitude changes caused by the movement of the mobile vehicle, ensuring the stability of the optical scanning head. Through the coordinated operation of the main detection unit and the electronic sentinel unit, the system achieves full coverage of detection ranges, filling security gaps in building gaps. The use of mobile electronic sentinel units allows for flexible deployment of the detection range, adapting to various complex terrain environments and improving the overall effectiveness of regional security.

The application provides a tunnel drainage system detection and dredging device, which comprises a control system, a detection system, a crushing system, a chassis driving system and a cleaning system arranged on a vehicle body respectively, the control system is connected with the detection system in communication, and the control system is connected with the crushing system, the chassis driving system and the cleaning system respectively for control. The device can accurately detect the position and thickness of the front blockage, and can clean and dredge the medium and low degree blockage through mechanical facilities, so that the detection and cleaning of the drainage system are facilitated.

The application provides a self-adaptive adjustment distributed optical fiber vibration sensor method, system and device, which is applied to the field of optical fiber sensing technology and comprises the following steps: receiving parameters of a DVS, selecting a monitoring mode applied by self-adaptive adjustment according to the received parameters of the DVS, the monitoring mode comprising a full-line measurement mode and a local measurement mode, calculating average light intensity and interference coefficient of a preset reference optical fiber section, judging whether the average light intensity is within a preset range, if yes, judging whether the interference coefficient is within a preset range, if yes, demodulating and calculating a vibration signal and positioning information, matching state information and early warning information according to a preset algorithm model, and displaying the output state information and early warning information. The application adopts the DVS to adaptively adjust line parameters after the optical fiber is connected to realize the best monitoring effect, and the DVS is changed from professional and complex to simple and easy to use without complex debugging by professional technicians.

The application discloses a conjugated non-fullerene acceptor material with azaparacyclophanquinone as a core, and a structural general formula is shown as formula I: wherein R1 and R2 are C m H 2m+1 , m is greater than or equal to 1 and is an integer; and X is any one of H, F, Cl, Br and CN. The acceptor material has excellent performance, three-dimensional charge transport characteristics and good intermolecular stacking effect, and high electron mobility. When the material is applied to a binary organic photodetector, the material exhibits excellent near-infrared light detection performance, including high specific detectivity, high responsivity, fast response speed and low dark current density.

The application relates to the technical field of optical lenses, and particularly discloses a large-aperture long-wave athermal infrared lens, which comprises a first lens, a second lens, a third lens and a fourth lens; the first lens, the second lens, the third lens and the fourth lens are sequentially arranged along the light incidence direction and on the same optical axis; the first lens is a positive focal power meniscus lens; the second lens is a negative focal power meniscus lens; the third lens is a positive focal power meniscus lens; the fourth lens is a positive focal power meniscus lens; and the first lens, the second lens, the third lens and the fourth lens are all aspherical lenses; the application realizes optical passive athermalization in a wide temperature range without a mechanical focusing mechanism through specific focal power distribution and complementary combination of a chalcogenide glass and a zinc selenide material; the long-wave infrared diffraction limit is broken; the structure is compact, the weight is light, the cost is low, and the application can perfectly adapt to a new generation of high-performance infrared detectors.

The application discloses a kind of multi-mode distributed optical fiber acoustic vibration sensing method and system based on time-frequency multiplexing, and relates to optical fiber sensing technical field.The method includes generating N linear frequency modulation pulse lights with different sweep frequency range and sweep bandwidth, forming a time series of detection pulse sequence after combining, and injecting it into sensing optical fiber;Generate a continuous light as local reference light;Collect the back Rayleigh scattering light generated by detection pulse sequence in sensing optical fiber, and carry out coherent mixing with local reference light, to obtain interference analog signal;Interference analog signal is collected and demodulated;Wherein, the demodulation includes switchable high spatial resolution mode and high signal-to-noise ratio mode.The application successfully solves the core problem that high spatial resolution and high signal-to-noise ratio cannot be considered, and effectively suppresses coherent fading and polarization fading noise.

The utility model belongs to ophthalmic examination technical field especially is a kind of multi-purpose ophthalmic examination device, including fixed column, the anti-skid pad of fixed installation is provided at fixed column bottom, the movable support column is provided in fixed column inside, the pin hole is provided in movable support column side, the fixed pin is provided in fixed column side, and the detection adjustment platform is fixedly installed in movable support column top, the fixed frame is fixedly installed in detection adjustment platform top, the support bracket is provided in fixed frame bottom, and the electric push rod is fixedly installed in fixed frame top, and one end of electric push rod is fixedly connected with the limit head cover.

The invention belongs to the technical field of ocean detection, and particularly discloses a seabed sediment in-situ detection device and method. The device comprises an upper computer, a transmitter and a receiver. At a transmitter end, a selected initial identification information code element is modulated to a low-frequency carrier frequency band in a multiband linear frequency modulation mode to generate a low-frequency modulated wave, and then the low-frequency modulated wave is modulated to a high-frequency carrier in an amplitude modulation mode to form a narrow underwater acoustic wave beam. At a receiver end, due to the fact that the self-demodulation capacity and the underwater sound dissipation characteristic of different types of substrates at different bit positions of identification information code elements are different, T-BOK demodulation is achieved through low-frequency echo receiving, the three-state identification codes are obtained, delay information of each bit position of the three-state identification codes is recorded, and time delay information of each bit position of the three-state identification codes is obtained. And obtaining seabed sediment type and distribution characteristic parameters through the three-state identification code demodulated by the low-frequency echo, the delay information of each bit and a pre-generated three-state identification code codebook.