917results about "Devices using optical means" patented technology

An electronic watch includes a housing and a crown assembly including a rotatable actuation member. The rotatable actuation member includes a knob external to the housing and configured to receive a rotational input and a shaft assembly coupled to the knob and positioned at least partially within the housing, the shaft assembly defining a sensing surface configured to rotate in response to the rotational input. The electronic watch further includes an optical sensing system configured to detect the rotational input, the detecting including directing light onto the sensing surface, receiving reflected light from the sensing surface, and producing a signal corresponding to a rotational motion of the sensing surface, the signal based at least in part on an interference between the light directed onto the sensing surface and the reflected light.

The invention discloses a vehicle speed detection method, a vehicle and a computer storage medium. The method comprises the following steps: acquiring a road video image; performing feature point detection on the road video image, and removing motion feature points in the road video image to obtain effective feature points; and determining the driving speed of the vehicle according to the effective feature points. The method can avoid the interference of the motion feature points on the driving speed detection, improves the accuracy of the driving speed detection, and is suitable for an outdoor complex environment.

The invention provides a navigation method and device, a storage medium, a program product and a vehicle, and relates to the technical field of navigation. The navigation method comprises the following steps: in a process that target equipment travels towards a first position point, acquiring a first speed of current traveling of the target equipment; according to the first speed, a playing parameter of a navigation animation is determined, the navigation animation is used for indicating a driving path of the target device when the target device reaches the first position point, and the playing parameter is at least used for representing the playing speed of the navigation animation; and outputting the navigation animation in a visual manner according to the playing parameters. According to the method, the playing speed of the navigation animation can be adaptively adjusted based on the current driving speed of the target equipment, so that the navigation animation can be completely played before the target equipment reaches the first position point, and the problem that a user cannot make a correct response when the vehicle reaches the first position due to the fact that the user cannot see complete prompt information is avoided. And the target equipment deviates from the correct navigation route.

The method and apparatus for a remote weapon station or incorporated into manually-aimed weapons. The methodology requires use of a muzzle velocity sensor that refines the aiming of the second and subsequent fires or volleys fired from weapon systems. When firing the first volley a weapon uses an estimated velocity and, at firing, the muzzle velocity of a projectile is measured. When firing the second volley a weapon's fire control calculates an aiming point using the measured velocity of the first volley.

The invention discloses a long-distance motion simulation system high-precision positioning and speed fixing method and device, the device comprises a slide rail, a slide table and a long-distance high-precision positioning and speed fixing unit, and the long-distance high-precision positioning and speed fixing unit comprises a photoelectric position marker, a high-speed signal acquisition and processing unit and a photoelectric encoder; when the sliding table passes through the photoelectric potential marker, a reflecting light path of the photoelectric potential marker is formed by using the light reflecting mirror, so that the photoelectric potential marker generates a pulse signal; the high-speed signal acquisition and processing unit acquires pulse signals in real time, marks time stamps on photoelectric potential marker signals acquired in real time, and determines absolute position data of the sliding table at the moment by taking the pulse signals transmitted by the photoelectric potential marker as a reference; the photoelectric encoder transmits a calculated distance value to the high-speed signal acquisition and processing unit; and obtaining real-time position information and instantaneous speed information of each sensing interval and the average speed of each sensing interval according to the absolute position data and the calculated distance value.

The invention relates to the technical field of video monitoring, and provides an ectopic dual-camera intelligent vehicle speed measurement method and system based on deep optimization. The method comprises the following steps: acquiring images acquired by two cameras which are arranged at different positions on the same side of a road; extracting features of each vehicle based on each vehicle detected by the first image and the second image, and matching the features of the vehicles in the first image and the second image; when a target vehicle reaches a speed measurement point area, determining a three-dimensional geometric projection constraint residual error according to depth estimation values of the two cameras and three-dimensional geometric projection constraints of the target vehicle and the two cameras, constructing an error-minimized target function in combination with a depth consistency error, and optimizing the depth estimation values of the two cameras to obtain a target vehicle speed measurement result; obtaining depth estimation optimization values of the first camera and the second camera; and converting the two-dimensional track pixel coordinates of the target vehicle into three-dimensional world coordinates based on the depth estimation optimization values of the first camera and the second camera, and calculating the final speed of the target vehicle.

The invention relates to an inertial navigation / polarization compass / laser velocimeter integrated navigation method, which belongs to the technical field of inertial navigation / integrated navigation, and comprises the following steps: mounting and fixing an inertial navigation system, a polarization compass and a laser velocimeter on a carrier, and acquiring coordinate systems of sensors; establishing a polarization compass error equation and a laser velocimeter error equation by considering a course angle installation error, a pitch angle installation error and a scale error of the laser velocimeter; and deriving an inertial navigation / polarization compass / laser velocimeter combined system state equation based on the error equation, establishing a measurement equation by taking the difference between the speed calculated by inertial navigation and the speed of the laser velocimeter and the product of the polarization vector of the polarization compass and the sun vector as observed quantities, and carrying out estimation and feedback correction on the system state. The invention provides an inertial navigation / polarization compass / laser velocimeter combined navigation method in a satellite navigation denial environment, which realizes full-autonomous and high-precision directional positioning.

The invention discloses a device and a method for testing initial velocity and distribution of fragments of a warhead, and the device is characterized in that a missile rack is arranged in a light filtering protection device, and is used for fixedly installing the warhead; the light filtering protection device is arranged between the high-speed camera laying room and the anti-reflection background, located on one side of the lens axis of the high-speed camera and used for enabling fragments generated by warhead explosion to penetrate through the space between the high-speed camera laying room and the anti-reflection background to shield explosion fire light and detonation products. The phenomenon that the lens of the high-speed camera is covered in the light curtain area of the explosion flame to cause overexposure is avoided, so that fragment flying images can be shot at a short distance. According to the testing device, explosion fire light is weakened through the light filtering protection device, the concentration of detonation products flying along with fragments is reduced, and therefore the fragment scattering process can be shot at a short distance, axial distribution of the initial speed of the fragments is directly calculated, and the fragment scattering angle is obtained.

The present application provides an image-based speed determination method, apparatus, device, and storage medium, which relate to the technical field of image recognition. The method includes: obtaining a first image and a second image during the movement of a target object in an environmental space, where the acquisition time of the first image is later than that of the second image; fusing a first feature extracted from the first image and a second feature extracted from the second image to obtain a fused feature map, where the fused feature map includes first pixel position information and second pixel position information of the target object; performing a first convolution operation on the fused feature map to obtain a displacement information feature map, where the displacement information feature map is used to represent the correspondence between pixel positions and displacements; extracting a target displacement corresponding to a target pixel position from the displacement information feature map; and determining the movement speed of the target object at the acquisition time of the first image according to the target displacement.

The invention relates to the technical field of industrial automation control, and particularly discloses a rotating speed detection and closed-loop control system based on photoelectric sensing and a PLC, and the system comprises at least one rotating body which is a rotating speed controlled object, and the surface of the rotating body is provided with a configurable number of reflection mark areas or speed measurement holes; the proximity photoelectric switches are in one-to-one correspondence with the rotating bodies, are aligned with the reflection mark areas or the speed measurement holes, and are used for detecting rotation information of the rotating bodies and generating original pulse signals; a high-speed counter input port of the PLC is electrically connected with signal output ends of the proximity photoelectric switches, and a pulse preprocessing module, a rotating speed calculation module, a deviation processing module, a control algorithm module and a signal adaptation module are arranged in the PLC. The PLC and the proximity photoelectric switch which are widely applied in the industrial field and high in popularity rate are adopted as core technical components, and expensive special servo controllers, encoders and other devices are not needed, so that the hardware purchase cost of the system is greatly reduced.

The invention discloses a laser interference normal / angular vibration synchronous measurement device and a decoupling method, and belongs to the field of laser interference measurement. The linear / angular vibration synchronous measurement device comprises an optical system, a precise adjustment support, a controller, a data acquisition system, linear / angular vibration comprehensive calibration software and an integrated connection cable. And the optical system is used for emitting three beams of measuring light, focusing the three beams of measuring light on the surface of the vibrator, receiving light energy returned from the surface of the vibrator and converting the light energy into photoelectric signals. And the precise adjusting bracket is used for precisely adjusting the measurement attitude of the optical system. And the linear / angular vibration upper computer is used for decoupling the acquired signals, respectively acquiring linear vibration and angular vibration parameters, realizing real-time tracking display of a time-frequency domain curve, and automatically fitting and quickly displaying a space operation vector trajectory of a moving target. According to the invention, a three-beam symmetric differential Mach-Zehnder heterodyne interference method is adopted, linear vibration and angular vibration parameters of a measured target can be synchronously obtained, and comprehensive calibration of a calibrated sensor is realized.

Systems and methods for stereo imaging with camera arrays in accordance with embodiments of the invention are disclosed. In one embodiment, a method of generating depth information for an object using two or more array cameras that each include a plurality of imagers includes obtaining a first set of image data captured from a first set of viewpoints, identifying an object in the first set of image data, determining a first depth measurement, determining whether the first depth measurement is above a threshold, and when the depth is above the threshold: obtaining a second set of image data of the same scene from a second set of viewpoints located known distances from one viewpoint in the first set of viewpoints, identifying the object in the second set of image data, and determining a second depth measurement using the first set of image data and the second set of image data.

The invention particularly relates to a rotating speed measuring system and method based on a metasurface light modulator, and aims at solving the problems that an existing rotating Doppler rotating speed measuring system is numerous in optical elements, complex in structure and low in optical efficiency. Comprising a single-mode fiber laser, and a metasurface light modulator, a half-wave plate and a polarization splitting prism which are arranged on an emergent light path of the single-mode fiber laser, a quarter-wave plate and a rotating target object to be measured are sequentially arranged on a transmission light path of the polarization splitting prism, and a photoelectric detector and a measuring terminal connected with the output end of the photoelectric detector are arranged on a reflection light path of the polarization splitting prism. The metasurface light modulator is used for directly generating a vortex beam carrying topological charge conjugate superposition photon orbital angular momentum, and the rotating speed of a rotating target is measured by using the rotating Doppler effect. Compared with an existing system, an extra 4F optical filtering system or an annular interference light path is not needed, and the system has the advantages of being simple in light path, compact in structure and high in optical efficiency.

The invention discloses a ceiling fan rotating speed test method and system, and relates to the technical field of ceiling fan rotating speed measurement, and the test method comprises the specific steps: S100, system preparation and parameter setting: starting a ceiling fan rotating speed test system, carrying out the comprehensive power-on self-test of the whole system, and inputting the number of fan blades of a ceiling fan through a product setting interface by a user; non-contact measurement is carried out through the laser pulse signals, the problem that application of a traditional rotating speed measurement method to a ceiling fan with an illuminating lamp is limited is effectively solved, remote and non-contact measurement of the rotating speed of the ceiling fan is achieved through installation of the laser transmitter and the receiver, and the measurement accuracy is improved. Errors and damage risks caused by physical contact are avoided, the application range of the measuring method is widened, in addition, due to the high sensitivity and high precision characteristics of the laser sensor, the rotating speed of the ceiling fan rotating at a high speed can be accurately measured, and the measuring accuracy and reliability are improved.

The invention provides a satellite disc rotating speed detection method and system of MOCVD equipment, computer equipment and a storage medium, and relates to the technical field of semiconductor detection. Weak rotating speed characteristic signals are accurately extracted from noise through time domain and frequency domain fusion and a state estimation algorithm; the detection capability and the peak position stability of the rotating speed characteristic under the strong noise background are obviously improved; by taking a fusion result as an initial value and introducing state estimation of system dynamics, millisecond-level real-time updating and high-precision rotating speed analysis can be realized; the preset system dynamics model can dynamically fuse the current observation value and the historical state, the random error caused by airflow disturbance, mechanical vibration and electromagnetic interference is effectively inhibited, the output result is smooth and stable, and the reliability is greatly enhanced.

The invention relates to a scanning system which comprises a scanning device (1) and a processing device (2), the scanning device (1) is configured to scan a detected object (3) moving relative to the scanning device (1), an included angle alpha between a scanning plane (11) of the scanning device (1) and the advancing direction of the detected object (3) is an acute angle or an obtuse angle, and the processing device (2) is in signal connection with the scanning device (1). The processing device (2) is configured to receive an image scanned by the scanning device (1) and perform stretching or compression processing on the scanned image according to a reference part on the detected object (3), and the reference part is always perpendicular to the advancing direction of the detected object (3) in the advancing process of the detected object (3). According to the invention, the dependence of the image processing process on the traveling speed of the detected object can be effectively reduced, the configuration of a speed measuring device is reduced, and the scanning inspection cost is reduced.

The utility model provides a wafer cleaning device. The wafer cleaning device comprises a cleaning mechanism, a rotating mechanism and a velometer, the rotating mechanism is used for mounting a wafer and can drive the wafer to rotate, and the edge of the wafer is provided with a notch; the cleaning mechanisms are arranged on the two sides of the rotating mechanism and used for cleaning the front face and the back face of the wafer; and the velometer is arranged close to the rotating mechanism, corresponds to the edge of the wafer, and is used for detecting the position of the notch so as to obtain the rotating speed of the wafer. According to the wafer cleaning device provided by the utility model, the velometer is arranged near the rotating mechanism and is used for detecting the rotating speed of the wafer, so that the accuracy of detecting the rotating speed of the wafer when the wafer is cleaned is improved, and the accuracy of judging the wafer cleaning effect by a worker is ensured, so that the worker can timely adjust the optimal rotating speed when the wafer is cleaned, and the working efficiency is improved. And the cleaning effect of the wafer is improved.

The invention discloses an integrated optical chip, a preparation method and an optical gyroscope, the integrated optical chip comprises a first device layer and a second device layer, the first device layer is provided with a phase modulator, the phase modulator comprises two fourth waveguides used for being connected with an interference ring, the second device layer is provided with a detection unit, and the detection unit comprises two fourth waveguides used for being connected with the interference ring. The detection unit comprises a first coupler and a detector, the first coupler comprises a first waveguide, a second waveguide and a third waveguide, the first waveguide is used for connecting a light source, the first waveguide is connected with the third waveguide, the second waveguide is connected with the third waveguide, and the third waveguide is connected with the phase modulator; the detector is connected with the second waveguide; wherein a light beam is transmitted to the phase modulator through the first waveguide and the third waveguide and is transmitted to the interference ring through the phase modulator, and a test light beam transmitted back by the interference ring is transmitted to the detector through the third waveguide and the second waveguide.

The utility model relates to the technical field of grating performance testing, and particularly discloses a high-speed grating performance testing device, which comprises a testing motor, an output shaft of the testing motor is provided with a grating disc to be tested; a reference encoder which is installed on the test motor and is used for measuring the actual rotation amount of the test motor; the shading part is used for carrying a light-emitting element and a light-sensitive element to be detected; the moving assembly is used for carrying the shading cloth part and can drive the shading part to do linear translational motion along the X axis, the Y axis and the Z axis in the three-dimensional space; the temperature control part is used for wrapping the shading part and changing the temperature in the shading part; the test host is electrically connected with the reference encoder and the photosensitive element; according to the utility model, measurement errors at different installation distances can be obtained, the measurement precision of the high-speed grating encoder applied to the high-speed environment measurement work in the later period is ensured, and the production quality of the high-speed grating encoder is ensured.

The invention discloses a river surface flow velocity measurement method, system and product based on a video image, and the method comprises the steps: firstly selecting N unmanned ship control points, and calculating a perspective matrix through the geographic coordinate data of an unmanned ship and the pixel coordinates of the unmanned ship in the video image; wherein N is a preset value; converting the geographic coordinates of the point with the speed to be measured into pixel coordinates through the perspective matrix; using an RAFT optical flow model to generate a pixel-level speed of each pixel of the video image, namely an optical flow field; acquiring the pixel-level speed of the to-be-measured speed point from the optical flow field by using the pixel coordinates of the to-be-measured speed point; and finally, obtaining the real-level speed of the river by using a multi-layer perceptron. According to the method, the real speed measured by the ADCP carried by the unmanned ship is utilized to supervise and train the multi-layer perceptron model, the combined loss function is utilized to restrain the model, and the real-level speed can be predicted by combining river position features and numerical value features. According to the invention, a non-contact video acquisition mode is adopted, the equipment cost is reduced, and the measurement efficiency is improved.

The invention relates to the field of vehicle speed measurement, in particular to a vehicle speed measurement system based on radar and machine vision, which comprises a radar module, a machine vision module, a data fusion module, a speed measurement result output and display module and a system calibration and self-diagnosis module. According to the invention, high-precision speed measurement can be realized under various complex weather conditions, road conditions and vehicle driving states through advantage complementation of radar and machine vision in combination with an advanced hybrid filtering algorithm; the system has strong adaptability to different environment conditions and road scenes; the optimal design of data acquisition, processing, fusion and result output ensures that the system has high real-time performance and can quickly and accurately reflect the current running speed of the vehicle; the speed measurement result can be locally checked in real time, and a remote transmission function is also provided, so that a remote monitoring center can carry out macroscopic monitoring on regional traffic flow, vehicle speed distribution and the like conveniently.

An aircraft wheel and brake assembly includes a wheel, a brake configured to brake the wheel, and a measurement device configured to measure the speed of rotation of the wheel. The brake includes at least one friction member, an actuator support, and at least one brake actuator carried by the actuator support and configured to exert a braking force selectively on the friction member. The measurement device includes a target and a sensing component for producing a measurement signal representative of the speed of rotation of the target. The aircraft wheel and brake assembly is configured in such a manner that, when assembled, the target is constrained to rotate with the wheel and the sensing component is mounted on the actuator support. The target and the sensing component is configured in such a manner that the sensing component detects rotation of the target.

The optical sorting machine comprises: a light source; a color sensor; a determination unit for foreign matter and / or defective products; a color deviation amount calculation unit, which calculates, for a color image obtained by the color sensor, the amount of color deviation caused by the separation of at least two element groups among the R element group, the G element group and the B element group in the transfer direction of the sorting object; a speed calculation unit, which calculates the transfer speed of the sorting object based on the separation distance of at least two element groups in the transfer direction, the color deviation amount, and the scanning time which is the time required for one scan of the color sensor; and a sorting device, which performs a track changing action at a time point determined based on the transfer speed calculated by the speed calculation unit, and the track changing action is used to change the track of a specific sorting object determined based on the determination result of the determination unit.

The invention belongs to the technical field of vehicle overrun detection, and discloses a vehicle determination method and system based on video detection and distributed optical fibers, and the method comprises the steps: obtaining target information recognized by a camera, building a first database, obtaining target information recognized by the distributed optical fibers, and building a second database; pixel coordinates in the first database are converted into relative position coordinates, the similarity between the relative positions in the first database and the relative positions in the second database is judged within the same detection time, and if the similarity exceeds a certain threshold value, it is considered that data of the two vehicle tracks are from the same target vehicle; and fusing the monitoring data in the first database and the second database of the target vehicle to obtain an overrun detection database. According to the method, the target detection function of deep learning and the advantages of distributed optical fibers are combined, the vehicle determination method based on multi-device fusion is realized, and accurate determination of the vehicle is realized.

A self-mixing interferometric laser sensor (100) comprises a vertical cavity surface emitting laser, VCSEL, (10) configured to emit laser radiation (9) with a linear polarization (90) through an emission surface (14), a first photodetector (21) configured to monitor a first part (91) of the laser radiation (9) and to output a first signal (1), a first linear polarizer (23) arranged in front of the first photodetector (21) such that the first part (91) of the laser radiation (9) passes through the linear polarizer (23) before reaching the first photodetector (21), a second photodetector (22) configured to monitor a second part (92) of the laser radiation (9) and to output a second signal (2), a second linear polarizer (24) arranged in front of the second photodetector (22) such that the second part (92) of the laser radiation (9) passes through the second linear polarizer (24) before reaching the second photodetector (22), wherein the first linear polarizer (23) is oriented at a first angle (71) with respect to the linear polarization (90) of the VCSEL (10), wherein the second linear polarizer (24) is oriented at a second angle (72) with respect to the linear polarization (90) of the VCSEL (10), wherein the first angle (71) is substantially +45° and the second angle (72) is substantially -45°.

The invention belongs to the technical field of oil and gas field development, and particularly relates to an experimental determination method for the debris settling velocity of an irregular-shaped bridge plug. The method comprises the following steps: collecting bridge plug scraps flowback on site, classifying and testing the volume and density of the bridge plug scraps according to the material of the bridge plug scraps, measuring the shape parameters of the bridge plug scraps by using an image processing method, combining five bridge plug scrap shape characterization parameters of roundness, aspect ratio, radius ratio, sphericity and equivalent diameter, and taking a correlation coefficient R2 as an evaluation index, the correlation among the shape parameters of the bridge plug chippings is compared, the aspect ratio, the radius ratio and the roundness are determined to serve as main parameter characteristic parameters of follow-up calculation, the settling speed of the bridge plug chippings is measured through a static settling experiment, and a drag coefficient model suitable for the bridge plug chippings in the irregular shape is established on the basis of a spherical drag coefficient model. The model is fitted by using the measured settling velocity data, and theoretical support is provided for the design of the debris flowback flow parameters of the bridge plug of the shale gas horizontal well.

Disclosed are an internal magnetic control device, a flywheel assembly and a fitness equipment, wherein the flywheel assembly comprises a flywheel, an internal magnetic control device and a speed measuring device, wherein the internal magnetic control device comprises a housing unit, a driving unit, two swing arms and two sets of magnetic elements, wherein the driving unit is arranged at the housing unit; a pivoting end of each of the swing arms is rotatably mounted at the housing unit; a driven end of each of the swing arms is rotatably connected to the driving unit; the two sets of the magnetic elements are respectively arranged at each of the swing arms; wherein the flywheel is rotatably arranged around the internal magnetic control device, wherein the speed measuring device comprises a sensing element and an acting member.

The invention discloses an OCT catheter rotation synchronism detection method, system and device and a medium, and the method comprises the steps: obtaining a real-time catheter end face image of an OCT catheter in a simulated blood vessel, and carrying out the feature extraction of the real-time catheter end face image, and obtaining the real-time coordinates of at least two feature points; performing feature point matching according to the real-time coordinates of the at least two feature points to obtain a real-time rotation angle and a real-time offset displacement; calculating an instantaneous rotating speed according to the real-time rotating angle; according to the real-time offset displacement, calculating the accumulated offset displacement of one circle of rotation; acquiring an equipment rotating speed, and obtaining a rotating score value according to the instantaneous rotating speed and the equipment rotating speed; obtaining a jitter score value according to the real-time offset displacement and the accumulated offset displacement; and obtaining the synchronization performance grade of the OCT catheter according to the rotation score value and the jitter score value. Accurate detection of synchronism and uniformity between the equipment end and the OCT catheter is achieved, and the detection result is more comprehensive, accurate and reliable.

A system and a method include a wand assembly including a sanitizing head having an ultraviolet (UV) lamp configured to emit UV light to sanitize a surface of a component. The wand assembly further includes a first monitored member. The system also includes a second monitored member. A verification control unit is in communication with the first monitored member and the second monitored member. The verification control unit is configured to detect a speed of the wand assembly based on a comparison of the first monitored member in relation to the second monitored member.

The invention discloses an integrated optical chip, a preparation method and an optical gyroscope, the integrated optical chip comprises a first device layer and a second device layer, the first device layer is provided with a phase modulator, the phase modulator comprises a fourth waveguide used for connecting an interference ring, and the second device layer is provided with a detection unit. The detection unit comprises a first coupler and a detector, the first coupler comprises a first waveguide, a second waveguide and a third waveguide, the first waveguide is used for connecting a light source, the first waveguide is connected with the third waveguide, the second waveguide is connected with the third waveguide, and the third waveguide is connected with the phase modulator; the detector is connected with the second waveguide; wherein the second device layer comprises a first sub-device layer and a second sub-device layer, the coupling loss of the first sub-device layer is larger than that of the second sub-device layer, at least part of the detector is located on the first sub-device layer, and the first coupler is located on the second sub-device layer.