24results about How to "Improve detection performance" patented technology

The invention relates to a preparation method of TiO2 and TiO2 / ZnO heterojunction based on a hollow structure and application of the TiO2 and TiO2 / ZnO heterojunction in an ultraviolet detector, the hollow structure TiO2 is a TiO2 hollow sphere, a TiO2 hollow cube and a TiO2 hollow dodecahedron, the hollow heterostructure is composed of the hollow structure TiO2 and a ZnO nanorod, the ZnO nanorod grows on the surface of the TiO2 hollow structure, and the whole ZnO nanorod is hedgehog-shaped; the prepared hollow-structure TiO2 and TiO2 / ZnO heterojunction is coated on a conductive surface of FTO conductive glass to prepare a working electrode, the working electrode is connected with a counter electrode through a heat sealing film, electrolyte is injected into an internal cavity to obtain the ultraviolet detector with high detection performance, and the ultraviolet detector is suitable for the field of ultraviolet detection. The method adopted by the invention has the advantages of simplicity in operation, low cost and high universality, different hollow-structure TiO2 and hedgehog-shaped TiO2 / ZnO heterojunctions such as spherical, cubic and dodecahedron heterojunctions are synthesized, an ultraviolet detector with a self-energy-supply characteristic is further prepared, and the application of a TiO2 nano material in the field of photoelectric detection is expanded.

The present invention discloses a multi-longitudinal mode Doppler laser radar calibration method based on dual F-P interferometers. The cavity length of the dual F-P interferometer is adjustable within a large range, and has two tuning modes: coarse adjustment and fine adjustment, which are controlled by an F-P interferometer controller; the calibration light source is multi-longitudinal mode, quasi-continuous backscattered light after the emitted laser pulse is incident on a long bare optical fiber. During calibration, a method of alternating coarse and fine scanning of the F-P interferometer cavity length is adopted. The present invention can accurately and conveniently realize the calibration of a multi-longitudinal mode Doppler laser radar system based on a dual F-P interferometer without changing the laser radar optical path structure, including the laser longitudinal mode spacing Λ and the free spectrum spacing ν of the F-P interferometer. FSR Matching calibration and dual F‑P interferometer transmittance curve calibration, between Λ and ν FSR Under the premise of matching, the optimal dual F-P interferometer transmittance calibration curve is obtained, so that the detection performance of the multi-longitudinal mode Doppler lidar system can be optimized.

The invention relates to a preparation method of a low-concentration phosphorus-doped VO2 thermosensitive film for cable infrared temperature measurement. The preparation method comprises the following steps: mixing vanadium pentoxide and oxalic acid, dissolving in deionized water, and heating in an oil bath to obtain a vanadyl oxalate solution; dissolving sodium hypophosphite in the vanadyl oxalate solution to obtain a mixed solution; enabling solute in the mixed solution to grow on the surface of the double-parabolic sapphire substrate by adopting a high-temperature hydrothermal method to form a modified thermosensitive film; washing the modified thermosensitive film with deionized water, and blow-drying; spin-coating one surface of the modified thermosensitive film with a hydrogen peroxide solution to obtain a sample; post-annealing treatment on the sample is completed, and the low-concentration phosphorus-doped VO2 modified thermosensitive film is obtained. The method has the beneficial effects that the surface roughness is reduced; the linear temperature measurement range is widened; temperature measurement is more sensitive; and the application range is wider.

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 relates to the technical field of underwater surveying and mapping stabilization, in particular to a stabilizing device for an underwater surveying and mapping instrument, which comprises a small carrying ship, two auxiliary floating seats are fixedly connected to the bottom end of the small carrying ship, and a positioning stabilizing seat is arranged on the inner side of the small carrying ship in a penetrating manner; a water flow divider is arranged at the front end of the positioning stabilizing seat, a stabilizing placing chamber is arranged on the inner side of the small carrying ship, a blocking frame is arranged on the inner side of the small carrying ship, a stability maintaining box is arranged on the inner side of the stabilizing placing chamber, and a balance stabilizing assembly is arranged on the inner side of the stability maintaining box. When the underwater surveying and mapping instrument stabilizing device is used, the influence of hull vibration on the stability of the surveying and mapping instrument in the moving process of the underwater surveying and mapping instrument can be reduced, the stability of sound wave transmitting and receiving signals is guaranteed, the propagation speed direction and strength of sound wave detection are guaranteed, and the accurate effect of detection and positioning is improved. And the overall surveying and mapping stable effect and quality are improved.

The present invention provides a pyramid wavefront sensor and a target wavefront detection method, wherein the pyramid wavefront sensor includes a first converging lens, a field stop, a corner cone prism, a second converging lens and a detection camera arranged in sequence along the propagation direction of a light beam, the vertex of the corner cone prism is located at the focus of the first converging lens, and the detection plane of the detection camera is conjugate to the plane where the vertex of the corner cone prism is located; a microlens array is arranged between the second converging lens and the detection camera, and the microlens array is used to effectively separate the target signal on the detection camera from the skylight background signal. The present invention combines the corner cone prism and the microlens array to achieve effective separation of the skylight background signal and the target signal, and cooperates with the skylight elimination algorithm to calculate and remove the skylight value of each sub-aperture, extract the effective information of the target, and is more suitable for the detection of weak targets, thereby effectively realizing the application of the pyramid wavefront sensor in the daytime natural guide star adaptive optical system.

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 invention provides a high-sensitivity photoelectric detection module, and the module comprises a butt joint part which is used for fixing a ceramic ferrule which is inserted into the butt joint part and can emit an optical signal. The detection part and the butt joint part are coaxially arranged, and a photoelectric detector is arranged in the detection part and used for receiving an optical signal sent by a ceramic ferrule; the outer sleeve sleeves the outer sides of the butt joint part and the detection part, one side of the outer sleeve is rotatably connected with the butt joint part, the other side of the outer sleeve is in threaded connection with the detection part, and the distance between the ceramic ferrule and the photoelectric detector is adjusted through relative rotation between the outer sleeve and the flange fixing seat. Therefore, each photoelectric detector can exert the optimal detection performance, the detection sensitivity is improved, and the yield of products 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 belongs to the technical field of antennas, and relates to a fan-shaped dipole antenna, which comprises a rectangular dielectric layer and a radiation layer arranged on the dielectric layer, the radiation layer comprises two fan-shaped radiation patches which are distributed in an axial symmetry manner relative to any symmetry axis of the dielectric layer, and the two radiation patches are used as two oscillators of the dipole antenna; the two radiation patches are arranged at an interval, and the feed structure is loaded in the interval between the two radiation patches; the central angle of the sector on the radiation patch is an acute angle. The bandwidth of the ultra-wideband antenna can be expanded, and the ultra-wideband antenna is simple in structure and convenient to process.

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.

The present invention provides an aperture coded spectrum detection device based on compressed sensing, which solves the problem that both the dispersion type and the interference type spectrum detection technologies in the existing spectrum detection technologies have certain deficiencies. The device comprises an imaging mirror, a filter array, a spatial light modulator, a unit detector and a data processing unit arranged in sequence along the light beam direction; the imaging mirror is used to image the target at a primary image plane position; the filter array is used to modulate the spectrum information of the target so that the wavelengths of the light at different aperture positions are different; the spatial light modulator is used to encode the modulated spectrum information; the unit detector is used to receive the encoded image signal; the data processing unit is used to decode the encoded image signal received by the unit detector, and the spectrum data of the target can be restored.

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 present invention proposes a reverberation suppression method based on angle-delay-Doppler three-dimensional deconvolution, which transmits narrowband pulses to the target detection area, and then uses a set of matched filters carrying different Doppler frequency shifts to process the array element echoes to obtain a delay-Doppler two-dimensional output; conventional beamforming is performed on the delay-Doppler two-dimensional output of the array element to obtain an angle-delay-Doppler three-dimensional output; an angle-delay-Doppler three-dimensional beam map is obtained, and its absolute value is taken as the point spread function of the R-L algorithm; the absolute value and point spread function of the angle-delay-Doppler three-dimensional output are used as the input of the three-dimensional R-L algorithm, the number of iterations is selected, and the reverberation suppression result is calculated according to the deconvolution formula. The present invention uses the inherent energy distribution difference between the target echo and the strong reverberation in the three dimensions of angle, delay, and Doppler to suppress reverberation, improve the multi-dimensional resolution capability, suppress the multi-dimensional sidelobe energy leakage, and suppress the bottom and surface reverberation at the same time.

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 present invention provides a photodetector of a composite structure of noble metal nanowires and two-dimensional molybdenum disulfide and a preparation method thereof. First, a first noble metal nanowire array consisting of a plurality of parallel noble metal nanowires is prepared on an oxidized silicon wafer; a monolayer molybdenum disulfide film is then transferred to the top of the first noble metal nanowire array on the oxidized silicon wafer by a micromechanical peeling method; finally, a second noble metal nanowire array and a noble metal electrode are constructed on the monolayer molybdenum disulfide film, and the nanowires of the second noble metal nanowire array and the nanowires of the first noble metal nanowire array are perpendicular to each other to form a noble metal nanogrid, thereby obtaining a photodetector based on a composite structure. The preparation method makes the width and spacing of the noble metal nanowires more controllable, and can realize flexible modulation of the optical properties of two-dimensional materials. The structure can firmly localize and enhance the light field, improve the light absorption capacity and sensitivity of the photodetector, and has strong light detection performance.

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 utility model discloses an automobile brake master cylinder framework installation detection device which comprises a supporting plate, a first motor is fixedly connected to the middle axis position of the bottom of the supporting plate, the output end of the first motor is fixedly connected with a crankshaft, the surface of the crankshaft is movably connected with a connecting plate, the top of the connecting plate is fixedly connected with a fixing plate, and the fixing plate is fixedly connected with a second motor. The top of the fixing plate is fixedly connected with a second motor, the output end of the second motor is fixedly connected with a lead screw, the surface of the lead screw is in threaded connection with a threaded sleeve, and the right side of the top of the threaded sleeve is fixedly connected with a detection camera. By arranging the first motor, the crankshaft, the connecting plate and the fixing plate, the detection camera can be conveniently adjusted front and back, by arranging the second motor, the lead screw and the threaded sleeve, the detection camera can be adjusted left and right, by arranging the draught fan, the exhaust pipe and the spray head, cleaning is convenient, and the detection effect is good.

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.