1088results about "Optical rangefinders" patented technology

Apparatus, systems, and methods for mapping utility lines in utility potholing operations are disclosed. Pothole mapping apparatuses, systems, and methods may be employed in utility locator devices and utility locating systems to map potholed utility lines. Data generated via pothole mapping may be used to calibrate utility depth measurements in utility locator devices and systems. Further, information revealed about utility lines during potholing procedures may be used to train neural networks and utilize artificial intelligence in generating predictions regarding the positions and characteristics of utility lines.

This invention discloses a monocular ranging system and method for underground unmanned vehicles, comprising the following steps: During the vehicle's travel route, images of the preceding vehicle are acquired via sensors, and detection box information and the type information of the preceding vehicle are automatically identified; the vehicle pose of the preceding vehicle is determined based on the type information and detection box information; the pixel coordinates of the closest point on the preceding vehicle to the sensor are obtained in the preceding vehicle image based on the vehicle pose; the measured distance between the closest point and the sensor is obtained, and the measured distance is then predicted and updated to obtain the vehicle distance. By real-time perception of the vehicle body, rear, and wheel hubs, a multi-target information fusion method is proposed based on the detection results, providing a prerequisite for accurate ranging. Then, a two-stage accurate ranging method is adopted, combining a traditional geometric ranging model with a Kalman filter algorithm to further improve the accuracy of the final result, thereby improving the stability and robustness of the ranging of the underground unmanned vehicle.

The invention discloses a submarine topography reconstruction system and method based on optical mobile measuring and scanning, and relates to the technical field of ocean exploration, and the system comprises the following units: an image collection unit, which is used for coordinating the emission of 532nm pulse laser and the collection of a gating camera image through a synchronous sequential circuit, a triangulation measurement optical structure with separated emission and reception is adopted, and a submersible can be carried for mobile measurement and scanning; the system calibration unit is used for carrying out joint calibration on camera parameters and a laser plane so as to determine system calibration parameters, so that the spatial position of a laser stripe accurately corresponds to the actual coordinate of the target surface; and the image processing unit is used for preprocessing the image acquired by the system and further extracting the coordinates of the center line of the laser stripe in the preprocessed image. According to the invention, adjacent splicing can be carried out through continuously collected laser stripe images to construct two-dimensional submarine landform information, and three-dimensional reconstruction of submarine topography can be carried out by using generated point cloud data.

The invention provides a ship distance estimation method and device based on an AIS (Automatic Identification System) supervision signal, relates to the technical field of intelligent shipping and water traffic supervision, and solves the problems that the prior art depends on a single sensor or a complex multi-source fusion scheme, so that supervision blind areas, inaccurate distance measurement and system complexity are caused, and the cost is low. And effective distance estimation cannot be carried out on the AIS-free ship. The method comprises the following steps: acquiring and preprocessing AIS data and video data; obtaining an approximate predicted position of the ship at the current moment through the AIS trajectory prediction model, and obtaining a ship target detection frame of the current field angle through the target detection model; dividing the current field angle of the camera into equal credible areas and carrying out space-time matching; and the matched visual features and AIS distance information are fused, an AIS distance is used as a supervision signal to construct a distance regression module, and a target detection model is trained to output a ship distance estimation value. The method is used in the other ship distance estimation process of the shore-based and ship bridge view angle.

The invention relates to the technical field of unmanned aerial vehicle radio detection, in particular to an unmanned aerial vehicle detection and judgment method based on cooperation of an air-ground system and radio detection, and the method comprises the steps: finding a suspected target through scanning of a multi-frequency-band radar, triggering an infrared thermal imager carried by an aerial unmanned aerial vehicle to approach an ultra-wide-frequency-band spectrum sensor for verification; accurate positioning is realized by combining ground photoelectric equipment multi-view triangulation positioning and a signal arrival time difference algorithm, a command and control center calculates threat levels through a multi-source data fusion engine, and navigation decoy of dynamically adjusting intensity is adopted for targets smaller than or equal to two levels. Hard killing of ground laser locking rotor center and air electromagnetic pulse synchronous coverage is executed on a target of more than or equal to three levels, the equipment state is synchronized in real time through an optical fiber link, high-energy-consumption equipment is intelligently closed after threat is relieved, a platform starting strategy is optimized, a detection closed loop of'three-dimensional perception-graded treatment-intelligent energy saving 'is constructed, and the intelligent energy saving effect is achieved. And an efficient and accurate low-altitude safety protection scheme is provided for a sensitive area.

The invention discloses an underwater measurement method based on a zoom camera and a laser diode, which adopts the zoom camera to measure a laser spot image and greatly expands the application scene of equipment. The lasers A, B and C are manufactured based on laser diodes, the linearity of power adjustment can be well guaranteed, and measurement errors caused by too bright or too dark laser spots in images shot by the camera can be effectively avoided. According to the underwater measurement method provided by the invention, not only can the distance of the target object be measured, but also the feature size of the target object can be measured; in the installation process of the underwater measurement device, an error measurement link of the installation position of the laser is added, and the error is fully considered when the feature size of the target object is measured, so that the measurement precision is improved. During calibration, the average value of the height of the triangle and the corresponding bottom edge ratio in the maximum magnification and minimum magnification states of the zoom camera is taken as an independent variable, so that the influence of magnification change on calibration precision is reduced.

An image processing device includes: a region dividing unit that divides each of a plurality of captured images captured by an in-vehicle camera into a plurality of divided regions; a feature point detection unit that detects, as a feature point, a portion exceeding a threshold value for each of the divided regions; a threshold value setting unit that sets the threshold value for each of the divided regions so as to evenly distribute the feature points detected in each of the divided regions; a feature point matching unit that performs matching by associating the feature points detected in the plurality of captured images with each other between the plurality of captured images; and a relative parameter calculation unit that calculates a relative parameter on the basis of the feature points associated between the plurality of captured images.

The present disclosure relates to a distance measuring device and a distance measuring method enabling use of a plurality of sensors employing different distance measurement schemes in combination at low cost. A pixel region including a pixel including a SPAD to be used for distance measurement using a direct ToF scheme and a pixel including a current assisted photonic demodulator (CAPD) to be used for distance measurement using an indirect ToF scheme or a normal pixel, and a light emitting unit are shared and controlled. The present disclosure can be applied to a distance measuring device.

For example, a lighting device capable of FOV switching is provided.The lighting device change a projection range of first light and a projection range of second light by causing a light-emitting unit and an optical member disposed on the optical path of the first light and the second light to act differently on the first light and the second light, the light-emitting unit including a first light-emitting element that emits the first light and a second light-emitting element that emits the second light.

The invention provides a high-strength winding thin-wall SiC composite cladding tube and a preparation method thereof. A preparation method of a high-strength winding thin-wall SiC composite cladding tube comprises the steps that silicon carbide fibers are wound and laid around a core mold, the winding pre-tightening force is smaller than or equal to 10 N. The winding mode comprises the first mode that one layer of annular winding is conducted firstly, then one layer of spiral winding is conducted, and the number of fiber intersection points in the whole annular direction at a certain position of the outer surface of the core mold is 1. One-layer annular winding is carried out firstly, then two-layer spiral winding is carried out, the number of fiber intersection points in the whole annular direction at a certain position of the outer surface of the core mold is 3, and a prefabricated body is obtained; carrying out a densification deposition process on the preform, wherein the densification deposition process comprises PyC pyrolytic carbon interface deposition, CVI chemical vapor infiltration and CVD chemical vapor deposition; and precise inner circle and outer circle machining is conducted, and the SiC composite cladding pipe is obtained. According to the preparation method disclosed by the invention, through a specific dry winding mode and a densification deposition process, the SiC composite material tube blank is higher in density and better in mechanical property.

An FM LIDAR system is described that includes a frequency modulated LIDAR system that incorporates a laser source that is optically coupled to a whispering gallery mode optical resonator. Light from the laser that is coupled into the whispering gallery mode optical resonator is coupled back out as a returning counterpropagating wave having a frequency characteristic of a whispering gallery mode of the optical resonator. This returning wave is used to reduce the linewidth of the source laser by optical injection. Modulation of the optical properties of the whispering gallery mode optical resonator results in modulation of the frequency of the frequencies supported by whispering gallery modes of the resonator, and provides a method for producing highly linear and reproducible optical chirps that are highly suited for use in a LIDAR system. Methods of using such an FM LIDAR system and vehicle assisting systems that incorporate such FM LIDAR systems are also described.

The invention discloses a preparation method of a high-hydrophobicity liquid lead bismuth alloy nitride coating capable of increasing a high-temperature contact angle, which comprises the following steps of: pretreating a substrate, depositing a FeCrAl coating on the surface of the substrate by adopting magnetron sputtering, and nitriding the FeCrAl coating to obtain a nitride coating; the invention further discloses the high-hydrophobicity liquid lead bismuth alloy nitride coating for improving the high-temperature contact angle. According to the preparation method, the FeCrAl coating is nitrided, so that the surface strength and corrosion resistance of the FeCrAl coating are improved, the formed FeCrAl nitride layer with a compact structure has high lyophobicity on the liquid lead bismuth alloy, the material surface is in a non-wetting state all the time, the liquid lead bismuth alloy can be effectively prevented from permeating into an alloy matrix, and the service life of the material is prolonged. The material is suitable for being used as a cladding material of a lead-cooled fast neutron reactor.

A nuclear fuel cell cladding that includes a zirconium-carbon covetic material. The zirconium-carbon covetic material has a carbon component associated with the surface of zirconium particles. The amount of carbon present in the zirconium-carbon covetic material is in a range of greater than 0.1 wt % to about 25 wt % of the zirconium-carbon covetic material. The carbon component may include carbon nanotubes, carbon nanomaterials, graphene, or graphene nanoplatelets. The carbon component may be uniformly distributed within the zirconium matrix. The zirconium-carbon covetic material may be formed from a zirconium alloy. The zirconium-carbon covetic material may be configured for use in various types of nuclear reactors. The synthesis of the cladding involves a process of plasma-enhanced chemical vapor deposition. The resulting nuclear fuel cell cladding offers improved performance and reliability for nuclear reactor applications.

Systems can include an acoustic sensor array configured to receive acoustic signals, an illuminator configured to emit electromagnetic radiation, an electromagnetic imaging tool configured to receive electromagnetic radiation, a distance measuring tool, and a processor. The processor can illuminate the target scene via the illuminator, receive electromagnetic image data from the electromagnetic imaging tool representative of the illuminated scene, receive acoustic data from the acoustic sensor array, and receive distance information from the distance measuring tool. The processor can be further configured to generate acoustic image data of the scene based on the received acoustic data and received distance information and generate a display image comprising combined acoustic image data and electromagnetic image data. The processor can determine depths of various acoustic signals within a scene and generate a representation of the scene the shows the determined depths, including floorplan and volumetric representations.

The invention discloses an anti-oxidation coating and a manufacturing method thereof, and belongs to the field of coatings. The anti-oxidation coating is arranged on the surface of a zirconium alloy matrix, the anti-oxidation coating is a pure Cr coating, the hardness of the anti-oxidation coating is in gradient distribution in the thickness direction, the hardness of a surface layer is larger than that of a bottom layer, and the hardness gt of the bottom layer of the anti-oxidation coating is larger than that of gt; the hardness gt at the 1 / 2 thickness is 4GPa; the hardness of the surface layer is gt; and 6 GPa. Good bonding strength is achieved between the anti-oxidation coating and the zirconium alloy matrix, cracks are not prone to being generated on a bonding interface when the anti-oxidation coating serves in a long-term high-temperature and high-pressure corrosion environment, the service life of the zirconium alloy matrix can be effectively prolonged, and the reliability of the zirconium alloy matrix can be effectively improved.

The invention relates to the technical field of optical three-dimensional measurement and metering, and discloses a single-camera three-dimensional coordinate measurement method and system based on full-field distance measurement, and the method comprises the following steps: S1, building a calibration field containing a control point, shooting an image of the calibration field through a monocular camera, extracting the image coordinate of the control point, carrying out the camera calibration, and obtaining a calibration field; obtaining internal parameters and external orientation parameters of the camera; and S2, controlling the laser range finder to aim at the control point in the calibration field through the non-orthogonal double-axis turntable. Submillimeter-level high-precision measurement can still be realized under the condition of a short baseline, and the problems that the precision in the depth direction is insufficient, the baseline requirement is long, parameters are easy to drift and the like in traditional stereoscopic vision measurement are effectively solved. By introducing a non-orthogonal double-shaft turntable and a visual guidance laser aiming mechanism, autonomous, rapid and accurate measurement of multiple measurement points in a large field of view is realized, and the automation degree and reliability of measurement in a complex environment are remarkably improved.

A projection unit projects pattern light on an area where a visual field of a first imaging unit and a visual field of a second imaging unit overlap each other. A measurement unit measures a distance to a surface to be measured onto which the pattern light is projected, based on a parallax between a first image obtained by the first imaging unit and a second image obtained by the second imaging unit. The pattern light is pattern light which includes a plurality of light regions with different hues and a plurality of light regions with the same hue and different levels of luminance, and in which a plurality of wide-area light regions are distributed in a predetermined pattern and a plurality of narrow-area light regions are distributed in another predetermined pattern in each of the plurality of wide-area light regions.

A target (100) for use in surveying applications is provided. The target comprises a plurality of light sources (106) arranged around a longitudinal axis (A) of a base element (108) of the target. The plurality of light sources is configured to emit light radially. The target further comprises a control unit (214). The control unit is configured to control an intensity of the light (440a, 440b) emitted by the plurality of light sources based on a distance (d1, d2) between the target and a surveying instrument (120) aimed towards the target.

Some systems include an acoustic sensor array configured to receive acoustic signals, an electromagnetic imaging tool configured to receive electromagnetic radiation, a user interface, a display, and a processor. The processor can receive electromagnetic data from the electromagnetic imaging tool and acoustic data from the acoustic sensor array. The processor can generate acoustic image data of the scene based on the received acoustic data, generate a display image comprising combined acoustic image data and electromagnetic image data, and present the display image on the display. The processor can receive an annotation input from the user interface and update the display image based on the received annotation input. The processor can be configured to determine one or more acoustic parameters associated with the received acoustic signal and determine a criticality associated with the acoustic signal. A user can annotated the display image with determined criticality information or other determined information.

The invention belongs to the technical field of nuclear fuel element surface protection, and particularly relates to a multi-layer composite (Cr, Al) Nx / Cr protective coating for a nuclear reactor zirconium alloy cladding and a preparation method of the multi-layer composite (Cr, Al) Nx / Cr protective coating. The coating adopts a multi-layer structure design consisting of a buffer layer, a middle layer and an outermost layer in sequence from inside to outside, wherein the buffer layer is a Cr coating; the middle layer is a nitrogen-saturated (Cr, Al) Nx coating, x is larger than or equal to 1, the middle layer is of a columnar crystal structure, and the hardness of the middle layer is 5-10 GPa; the outermost layer is a non-stoichiometric ratio (Cr, Al) Nx coating, x is larger than or equal to 0.6 and smaller than or equal to 0.9, a nanocrystalline structure is shown, and the hardness is 12-25 GPa. Component regulation, hardness gradient and a microstructure are subjected to collaborative design, so that the coating has excellent wear resistance, high oxidation resistance and structural integrity at the same time under a harsh nuclear working condition, the safety margin of the zirconium alloy cladding under normal service and accident working conditions is greatly improved, and the service life of the zirconium alloy cladding under normal service and accident working conditions is greatly prolonged.

The invention relates to an intelligent composite cladding tube with real-time monitoring and early warning regulation and control functions, which comprises a compact metal layer and a SiCf / SiC composite material layer which are used as an inner layer or an outer layer of the composite cladding tube, and a flexible transition layer positioned between the compact metal layer and the SiCf / SiC composite material layer, the sensing element is a silicon dioxide optical fiber or a molybdenum-rhenium alloy thermocouple and is used for monitoring the temperature change of the reactor core, so that the flexible transition layer has a temperature sensing function. According to the structure, the phenomena of local overheating and stress concentration can be effectively inhibited, so that the operation safety and the long-term service stability of a reactor system are remarkably improved.

The invention discloses a two-dimensional detection and SGBM three-dimensional ranging method based on improved YOLOv13, belongs to the field of computer vision, and particularly relates to the two-dimensional detection and SGBM three-dimensional ranging method based on the improved YOLOv13. The objective of the invention is to solve the problem of low cross-view-angle distance measurement precision in a three-dimensional space perception level of the existing method. The method comprises the following steps of: obtaining a trained YOLOv13-SHSA network model; the binocular camera obtains a left view and a right view; inputting the left view into the trained network model, and outputting three detection results by three detection heads of the trained network model; processing the three detection results to obtain detection frames and confidence coefficients of a plurality of targets in the left view; obtaining a disparity map of the left and right views; calculating a depth value corresponding to each pixel point in the disparity map according to the disparity map and the binocular camera parameters; and calculating the distance of the target object based on the depth map, the detection frames of the multiple targets in the left view and the confidence coefficient.

An assembly structure for a rangefinder positioning device is provided; an installation recess is provided on a surface housing of a rangefinder main body. An independent electronic locator can be disassembled and assembled through an installation hole in a center of an installation buckle. The installation buckle can be detachably provided in the installation recess by magnetic attraction, and a user can easily disassemble and install the electronic locator he wants to install; for example, when a rangefinder is needed for outdoor golf activities, it can be easily provided with the mature and popular AirTag on the market to achieve the positioning and anti-loss of the rangefinder by an AirTag software on a mobile phone. When the rangefinder is not needed or not needed for positioning, the AirTag can be easily disassembled and used for other purposes, which can save the design and manufacturing costs of the rangefinder.

A distance measurement device includes a light emitter for transmitting pulsed light and a light receiver for detecting reflected light from an object, providing an output signal. The device has at least one of a circuit or a processor with memory storing executable computer program code. The circuit or processor calculates an object distance using the time of flight of the pulsed light. Additionally, a histogram representing received light intensity for each time of flight is generated from the output signal. The device determines whether the object is within a short-distance range based on the timing of a peak in the histogram, and calculates the object distance using both a feature value related to the number of light reflections and the timing of the peak's decline.

The invention discloses a shield tunneling machine attitude deviation measurement method based on laser-vision deep learning heterogeneous fusion, and the method comprises the steps: employing double sensors of a laser target and a vision camera, carrying out the deployment of the sensors, and collecting data, which comprises laser data and vision data; preprocessing the data, wherein the preprocessing comprises laser data preprocessing and visual data preprocessing; the laser data preprocessing comprises laser data coordinate conversion, laser target attitude deviation calculation and noise filtering; the visual data preprocessing comprises image preprocessing, mark point detection, camera calibration and world coordinate calculation, and visual measurement attitude deviation calculation; a deep learning heterogeneous fusion model is constructed, the deep learning heterogeneous fusion model comprises a laser absolute feature branch, a visual spatial-temporal feature branch, an attention fusion layer and an output layer, and the model is trained; and inputting the preprocessed real-time data into the trained deep learning heterogeneous fusion model, and carrying out dynamic calibration on an output result.

An electronic device including an optical sensor is disclosed. An electronic device may include: a first housing; a second housing connected to the first housing to be partially movable in a movement direction; a flexible display that is disposed to be supported by the first housing and the second housing, in which a size of a display area exposed to the outside changes according to a movement of the second housing with respect to the first housing, and in which a light transmitter through which light is transmitted is formed; a printed circuit board (PCB) disposed in an internal space formed by the first housing and the second housing; an optical sensor configured to sense a target located outside the flexible display; and a processor. The optical sensor may include: a light source disposed on the PCB and configured to irradiate light to the outside of the flexible display through the light transmitter; and a light receiver connected to a rear surface of the display area of the flexible display and configured to receive light reflected from the target through the light transmitter. Relative positions of the light source and the light receiver may change according to a change in the size of the display area. In addition, various example embodiments may be possible.

The invention provides a tunnel unmanned aerial vehicle positioning method and system based on laser ranging, and relates to the technical field of unmanned aerial vehicle positioning, and the method comprises the steps: S1, building an unmanned aerial vehicle coordinate system in a tunnel at a moment t0 by taking a known position of a tunnel unmanned aerial vehicle as an original point, and controlling the tunnel unmanned aerial vehicle to fly along a Z axis; s2, synchronously acquiring a tunnel top image shot by a camera at a first elevation angle on a YZ plane when the tunnel unmanned aerial vehicle is at the original point and a first distance measured by a reference point in the tunnel top image irradiated by a laser range finder; s3, at the moment t1, synchronously obtaining a tunnel top image shot by the camera rotating from the first elevation angle to the second elevation angle in the YZ plane when the camera tracks the reference point and a second distance measured by the reference point in the tunnel top image irradiated by the laser range finder; and S4, performing positioning calculation according to the known position, the first elevation angle, the first distance, the second elevation angle and the second distance of the tunnel unmanned aerial vehicle.

Carbide-based fuel assembly includes outer structural member of ceramic matrix composite material, the interior surface of which is lined in higher temperature regions with an insulation layer of porous refractory ceramic material. A continuous insulation layer extends the length of the fuel assembly or separate insulation layer sections have a thickness increasing step-wise along the length of the fuel assembly from upper (inlet) section towards bottom (outlet) section. Fuel element positioned inward of the insulation layer and between support meshes has a fuel composition including HALEU and the form of a plurality of individual elongated fuel bodies or one or more fuel monolith bodies containing coolant flow channels. Fuel assemblies are distributively arranged in a moderator block, with upper end of the outer structural member attached to an inlet for propellant and lower end of the outer structural member operatively interfaced with a nozzle forming a nuclear thermal propulsion reactor.

A distance measuring device that outputs one or more distance information items each indicating a distance to a subject, the distance measuring device includes: a light source that emits illumination light including one or more bright portions; a light receiver that includes a pixel array in which pixels are arranged in a matrix; a distance information calculator that calculates, for each of the pixels, pixel distance information indicating a distance from the pixel to the subject when the light receiver receives reflected light that is the illumination light reflected off the subject; a distance information selector that selects one or more selective distance information items from among the pixel distance information items corresponding to the pixels; and an outputter that outputs the one or more distance information items, based on the one or more selective distance information items.

Techniques for determining whether a reflected lidar pulse has been subject to multipath reflection effects are disclosed. An initially emitted lidar pulse is generated having a property that varies across the pulse (either spatially in cross-section and / or temporally). Detected reflected pulses are analyzed to determine if they have similar or different properties. If the properties of both pulses are similar, the reflected pulse was likely not affected by multipath reflection. If the properties are similar, the reflected pulse likely was affected by multipath reflection. Pulses having a high likelihood of multipath reflections may be discarded (or disregarded) for subsequent processing.