469results about "Devices using optical means" patented technology

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 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.

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 relates to a resonant optical gyroscope signal detection method based on an optical switch. The resonant optical gyroscope signal detection method comprises the following steps: step 1, adopting a narrow linewidth laser as a light source; 2, the split light field enters a lithium niobate phase modulator A and a phase modulator B to be modulated by a triangular wave voltage signal, the light field subjected to phase modulation is coupled in opposite directions to enter a waveguide resonant cavity, and a photoelectric detector A and a photoelectric detector B are used at the output end of the resonant cavity to obtain a voltage signal; and voltage signals obtained by the photoelectric detector A and the photoelectric detector B are accessed to a lock-in amplifier. 3, arranging an optical switch A between the waveguide resonant cavity and the photoelectric detector A; and an optical switch b is arranged between the waveguide resonant cavity and the photoelectric detector B, so that the detection of a gyro signal is completed. The interference of polarization noise can be reduced, and the resonant frequency locking precision and the angular velocity detection sensitivity of the gyroscope are improved.

The invention provides a speed measurement method based on dynamic zooming of an unmanned aerial vehicle and an inspection system. The method comprises the following steps: acquiring a video stream acquired by the unmanned aerial vehicle in real time through a camera for dynamically adjusting focal length parameters; inputting the video stream into the detection model frame by frame; outputting a target detection frame set of the corresponding current frame; performing cross-frame association on the detection frames of the adjacent frames through a ByteTrack algorithm, and distributing a unique instance identifier for the same target; acquiring real-time parameters of the unmanned aerial vehicle, establishing a real pavement coordinate system and a pixel imaging coordinate system, and performing coordinate system projection mapping; and calculating the real speed of the target. The method has the beneficial effects that the coordinate mapping error is greatly reduced through dynamic parameter fusion and unmanned aerial vehicle displacement compensation, and particularly, the improvement is obvious in a pitch angle or zoom scene; through introduction of central point position transformation, image center offset caused by digital zooming is dynamically calibrated, and pixel-physical coordinate mapping distortion caused by pure image cutting or interpolation amplification is effectively eliminated.

The utility model discloses wire drawing graphite rolling line speed detection equipment, and relates to the technical field of automatic detection. The device comprises a rack; and the mounting plate is detachably mounted on the rack. According to the utility model, the position of the detection wheel can be conveniently adjusted according to graphite rollers with different diameters through the adjusting assembly, so that the detection wheel is in contact rotation with a rotating wiredrawing graphite material, the high-precision linear velocity sensor captures the rotation speed and transmits a signal to the controller, and a measurement result is displayed on an operation interface in real time; an operation interface provides visual operation and data display for a user, so that the whole measurement process is simple, efficient and easy to monitor, a worker does not need to hold a wire speed meter by hand to tightly attach the wire drawing graphite roller for measurement and then record the wire speed meter into a computer, the labor intensity of the worker is greatly reduced, and the working efficiency is improved. And meanwhile, the working efficiency of graphite roller linear speed detection is improved.

The invention discloses an intelligent road disease detection method and system based on a large model, and relates to the technical field of road maintenance engineering.The system collects road state data in real time through path planning and sensor group arrangement and transmits the data to an intelligent road disease detection system for data processing; forming a structure response data set and a vehicle load data set, calculating a periodic vibration accumulation index cap through the structure response data set to perform road state evaluation, executing an impact promotion analysis instruction when an evaluation result is a normal state, calculating an excitation fatigue response index sho through the vehicle load data set, road structure evolution evaluation is carried out in combination with the crack evolution kinetic potential index CEP obtained through calculation, and an optimization instruction is generated according to a road structure evolution evaluation result. According to the invention, full-period dynamic monitoring and intelligent decision making of road diseases are realized, the road fatigue and crack expansion trend can be identified in advance, the maintenance strategy is optimized, and the road use safety and management efficiency are improved.

The invention discloses a centrifugal machine rotating speed control method and system based on image recognition. The method comprises the following steps: acquiring each frame of preprocessed rotor region image; feature point extraction is carried out on each continuous two frames of images of each frame of preprocessed rotor region image, so that a rotation angle, an angular velocity estimation value and a rotor motion track are obtained; obtaining a fused rotation angle and an angular velocity estimation value according to the preprocessed rotor region image; according to the fused rotation angle and angular velocity estimation value, the rotation angle and angular velocity estimation value after self-adaptive fusion is obtained; calculating a real-time rotating speed estimation value of the centrifugal machine; generating a corrected real-time rotating speed estimated value according to the real-time rotating speed estimated value; and acquiring a control signal according to the corrected real-time rotating speed estimation value. According to the technical scheme, the anti-interference performance, the control precision and the environmental adaptability of the system can be remarkably improved, and the high-precision and high-stability control requirements of the high-speed centrifugal machine are met.

The invention discloses a roller rotating speed detection method and system based on an optical flow method. According to the scheme, on the basis of organic fusion of two-path image optical flow analysis and spatial geometry modeling, the detection of the rotating speed of a roller is realized under the condition of not depending on a physical sensor or any physical mark; non-contact detection is carried out on the rotating speed of the coal mining machine roller in the underground coal mine directly based on the operation video image of the coal mining machine roller, and the efficiency of high robustness and friendly visualization can be achieved.

The invention discloses a smart city traffic data processing system based on distributed sensors, relates to the technical field of city traffic data processing, and realizes dynamic switching of sensor sampling behaviors by introducing a linkage mechanism of an event trigger signal E (Tk) and a scheduling state signal S (Tk). Invalid data uploading is obviously reduced, and network bandwidth and storage resources are saved; the response speed of the system to traffic sudden change is improved; the situation of insufficient sampling density at the critical moment is avoided, and the abnormal event capture rate is improved. The system extracts collected vehicle speed vS, traffic flow density pS and lane occupancy zS from a standardized traffic data set, further constructs a length traffic flow abrupt change rate Hgamma and a fluctuation intensity factor H psi, and compares the length traffic flow abrupt change rate Hgamma and the fluctuation intensity factor H psi with set thresholds. The accuracy and the stability of abnormal event identification are improved; fine-grained and multi-level emergency judgment is supported; scheduling logic is driven through sensitive parameters, and the intelligent level of the whole system is improved.

An in-situ system for a gas turbine engine blade inspection including a sensor system configured to capture images of a forward surface of at least one gas turbine engine blade; a processor coupled to the sensor system, the processor configured to determine damage to the at least one gas turbine engine blade based on video analytics; and a tangible, non-transitory memory configured to communicate with the processor, the tangible, non-transitory memory having instructions stored therein that, in response to execution by the processor, cause the processor to perform operations comprising receiving, by the processor, data for the forward surface of at least one gas turbine engine blade from the sensor system; determining, by the processor, a rotational speed of a fan; and determining, by the processor, a fan synchronization.

The invention relates to the technical field of billiard sports intellectualization, in particular to an AI intelligent identification-based billiard table sounding bag and billiard cue hitting sensing accurate feedback system, which comprises a billiard cue sensing device, a bag opening detection device, a central processing device, a feedback execution device and a network communication device, the club sensing device collects hitting force, club body stress distribution and club body posture data and transmits the data to the central processing device; the bag opening detection device collects billiard ball bag entering state, ball number color, ball hitting speed and ball entering position data through optical, acoustic and infrared detection and transmits the data to the central processing device. After receiving and processing the multi-source data, the central processing device generates sound, vibration, voice feedback and interactive guidance instructions and sends the instructions to the feedback execution device; by integrating AI intelligent identification and multi-sensor data acquisition and processing, precise judgment, real-time feedback, multi-dimensional data statistical analysis and remote competition watching of billiard falling bags are realized, and ball hitting experience, training efficiency and competition propagation capability are improved.

A wind estimation apparatus includes an acquisition unit and an estimation unit. The acquisition unit acquires a target image of a target region. The estimation unit estimates at least one of a direction and strength of wind in the target region by using the target image.

The invention discloses a gravity energy storage speed adjusting device and method, and relates to the technical field of gravity energy storage power generation, the device is arranged on a bearing vehicle running on a track, and comprises a speed measuring mechanism and a speed reducing mechanism, the speed measuring mechanism is used for detecting the running speed of the bearing vehicle on the track, and the speed reducing mechanism is used for reducing the running speed of the bearing vehicle; the speed reducing mechanism is used for reducing the running speed of the bearing vehicle on the track, the speed reducing mechanism comprises a supporting frame, a sleeve, a movable sliding seat, a brake pad and an adjusting assembly, the rotating speed of the generator is prevented from exceeding the limit through real-time speed adjustment, output electric energy frequency and voltage fluctuation are avoided, the impact risk on a power grid is eliminated, and the grid-connected reliability of the gravity energy storage system is improved. Through the characteristic that the pressure of the brake pad is adjustable, scenes such as local gradient sudden change or load fluctuation of a bearing vehicle can be dealt with, and the compatibility of the device to terrain and operation conditions is remarkably improved. Mechanical stress damage is reduced by avoiding overspeed operation of the generator, excessive abrasion is prevented by the pressure controllable design of the brake pad, and the full-life-cycle maintenance cost is reduced.

The application provides a speed measurement method and an inspection system based on dynamic zoom of a UAV, comprising: acquiring a video stream collected by a camera of the UAV in real time by dynamically adjusting a focal length parameter; inputting the video stream into a detection model frame by frame; outputting a target detection frame set corresponding to a current frame; performing cross-frame association on detection frames of adjacent frames by a ByteTrack algorithm to assign a unique instance identifier to the same target; acquiring real-time parameters of the UAV, establishing a real road surface coordinate system and a pixel imaging coordinate system, and performing coordinate system projection mapping; and calculating a real speed of the target. The application has the beneficial effects that dynamic parameter fusion and UAV displacement compensation greatly reduce coordinate mapping errors, especially in a pitch angle or zoom scene, and the improvement is obvious; by introducing a center point position transformation, the application dynamically calibrates image center deviation caused by digital zoom, effectively eliminating pixel-physical coordinate mapping distortion caused by simple image cropping or interpolation enlargement.

To provide a speed measurement device capable of easily measuring speed of an object in a non-contact manner.SOLUTION: A speed measurement device includes: a light source 11 for irradiating an object 1 with excitation light; a fluorescence detector 12 for detecting fluorescence generated in the object 1 irradiated with the excitation light; a relation preservation device 21 for preserving a relation between speed of the object 1 and intensity of the fluorescence generated in the object 1; and a speed calculation unit 22 for calculating speed of the object based on the intensity of the detected fluorescence and the relation.SELECTED DRAWING: Figure 1

The invention discloses a wide-range high-precision steady-state and dynamic-state integrated rotating speed measuring system, and belongs to the technical field of rotating machinery metering. The system comprises a rotating speed measuring node (including an anti-interference sensor and an MCU microprocessor), an upper computer (including a time sequence coordination module and a data processing module) and a data output device, and adopts a continuous double-counting synchronous operation method to realize synchronous triggering of pulses and a time counter and period value inheritance. And a 40MHz temperature compensation crystal oscillator is matched to control the timing error within + / -1 clock period. The time sequence coordination module covers the ultra-wide range of 0.01-400000 r / min through a self-adaptive sampling mechanism (T = 0.01-25 s, K = 1-255), and the anti-interference sensor controls edge jitter within 2 microseconds. The dynamic sampling time of the system is less than or equal to 10ms, the steady-state relative error is less than or equal to 5 * 10 <-6 > (k = 2), the dynamic error is less than or equal to 1.5 * 10 <-4 >, the method is suitable for industrial automation, aero-engine testing and other scenes, the technical bottleneck is broken through, the rotating speed measurement precision and the dynamic response capability are improved, and an effective scheme is provided for precise monitoring of rotating machinery.

The application discloses a train positioning and speed measuring system and method with meter-level resolution TGD-OFDR, which comprises a TGD-OFDR optical path, a signal acquisition and demodulation module, a noise reduction module and a positioning and speed measuring module connected in sequence; the TGD-OFDR optical path couples the probe light with the local reference light; the signal acquisition and demodulation module processes the received optical signal to obtain real phase data; the noise reduction module uses the STAWDA algorithm to dynamically analyze the time-space correlation of the signal and the noise, enhances the effective vibration signal and suppresses random noise and interference; the positioning and speed measuring module calculates the differential phase curve based on the phase data after noise reduction, and determines the train position and speed through the time difference of the vibration position. The application effectively improves the train positioning accuracy and speed real-time monitoring, can acquire and process signals in real time, meets the positioning and speed measuring application requirements of the train in the actual scene, and provides reliable support for real-time monitoring and long-distance track train safe operation in the train operation process.

This invention provides a testing device and method for testing the maximum driving speed of a weapon station artillery piece. The testing device includes a testing box and a laser pointer. The laser pointer is coaxially mounted on the muzzle. The testing box contains a power module, a maximum driving speed test board for elevation and azimuth, and a maximum driving speed test board for azimuth. Four photosensitive modules and a stopwatch are arranged on the same panel of the testing box. Two photosensitive modules are symmetrically arranged at the top and bottom and left and right positions of the panel, respectively, to convert the received laser signals into electrical signals and transmit them to the maximum driving speed test board for elevation and azimuth or the maximum driving speed test board for azimuth, thereby controlling the start or end of the stopwatch. Based on the elevation and azimuth angles and the stopwatch display time, the maximum driving speed of the artillery piece for elevation downward and upward, and azimuth left and right is calculated. The device of this invention has high testing efficiency and accurate test results, overcoming the problems of complex and error-prone existing testing processes.

The invention belongs to the technical field of intelligent sensors, and particularly relates to a high-resolution velocity field image optical measurement method and system based on coherent detection. The method comprises the specific steps that light output by an intensity modulation laser is split into reflected light and reference light, the reflected light passes through a reflected light path and then enters an object to be measured, and the reference light passes through a reference light path and then enters a coherent image sensor together with a reflected light beam reflected by the object to be measured; the coherent image sensor comprises a space bridge and four charge-coupled devices, the space bridge splits incident light into four paths through beam splitting control, so that the four paths of incident light are uniformly distributed on the four charge-coupled devices, and the space bridge regulates the polarization state of the incident light; after a set integral exposure time, the controller collects voltage signals in each pixel unit of the four charge-coupled devices, combines the voltage signals and performs coherent processing to obtain a fundamental frequency signal, and calculates a target speed according to the fundamental frequency signal.

The invention relates to a speed measuring device and method based on a spatial light modulator, and the device comprises a single-mode laser, a beam-expanding collimation module, the spatial light modulator, a 4F system, a projection convex lens, a receiving convex lens, and a photoelectric detector. The beam expanding and collimating module is used for receiving a laser beam output by the single-mode laser and emitting the laser beam to the spatial light modulator after beam expanding and collimating; the spatial light modulator diffracts incident light and generates first-order diffracted light with alternately dark and bright stripes; the 4F system receives the first-level diffraction light, filters the first-level diffraction light and outputs the filtered first-level diffraction light to The projection convex lens vertically irradiates the filtered first-order diffraction light to the surface of an object to be measured, and the stripe change direction of equidistant light and shade alternated stripes in the first-order diffraction light is consistent with the motion direction of the object to be measured; the photoelectric detector receives part of scattered light carrying the speed information of the to-be-measured object based on the receiving convex lens and converts the scattered light into an electric signal so as to calculate the speed of the to-be-measured object.

A connected system includes a sensor module having a pulley pin load sensor sized and shaped to support a pulley of a strength fitness appliance. The sensor module also includes a sensor for sensing movement of the pulley as the pulley rotates. The sensor module includes a processor and a memory that stores machine-readable instructions that, when the processor executes the instructions, cause the sensor module to: acquire raw force data from the pulley pin load sensor; obtaining raw movement data from the sensor; determining corrected force data from the raw force data based on the calibration data; determining corrected movement data from the original movement data based on the calibration data; and outputting the corrected force data and the corrected movement data via the communication interface. The interface module may receive and display the corrected force data and the corrected movement data.

According to the present invention: a continuous sine wave signal is emitted toward an object serving as a target; a reflected wave comprising the sine wave signal reflected by the object is received; a frequency component of the sine wave signal that has been Doppler-shifted in accordance with the relative speed of a moving body and the object is extracted from the received reflected wave and output as a Doppler shift signal; a plurality of Doppler shift signals having a second duration are generated by cutting out, at a plurality of mutually different timings within a predetermined time period, a part of the Doppler shift signal having a predetermined first duration corresponding to the predetermined time period; a Doppler velocity for each of the Doppler shift signals having the first and second durations are calculated on the basis of the Doppler shift signals having the first and second durations; and the speed of the moving body in the current time period is determined on the basis of the calculated Doppler velocities of each of the Doppler shift signals having the first and second durations.

A polarization gradient detection and suppression structure based on light field regulation can directly replace different pumping and detection optical paths by setting a pumping optical path matching structure and a detection optical path selection structure on the main structure of the device, thereby realizing the combination of various gradient detection and gradient suppression schemes, facilitating the verification of the optimal combination scheme and improving experimental efficiency.

The application relates to a DMD-based molecular marker velocimetry system, comprising an MTV marker grid generation module and a camera module and a computer connected with the MTV marker grid generation module, the MTV marker grid generation module comprising two groups of symmetrically arranged DLP units which are orthogonal to a measuring fluid region, each of the DLP units being connected with a UV LED light source, the DLP unit comprising a DMD chip which converts the UV LED light source into a modulated light beam with stable intensity, spatially uniform distribution and time stability under the control of the computer, forms a marker grid in the measuring fluid region, excites a tracer, and realizes velocity field construction based on two shooting images collected by the camera module. Compared with the prior art, the application can greatly improve the grid thickness and light intensity stability of the molecular marker velocimetry marker grid, thereby improving the precision, and can reduce the number of optical elements used in the traditional molecular marker velocimetry technology, thereby reducing the measurement cost.

To detachably mount a portable information terminal to an adjustment target device.SOLUTION: A terminal holding tool has: a holding part 2 that detachably holds a portable information terminal 9 comprising a display part 91 that is used for adjustment and setting of an adjustment target device 84 when the adjustment target device 84 is installed; an insertion / removal part 3 that is inserted into or removed from a receiving part 6 provided on the adjustment target device 84 side; and a rotary connection part 5 interposed between the holding part 2 and the insertion / removal part 3.SELECTED DRAWING: Figure 1

The present invention proposes a device for measuring particle velocity under strong background interference using modulated laser light. The device comprises a laser light intensity modulation system for modulating the laser light into a laser with varying intensity according to a modulation frequency; a data acquisition and processing system for collecting the scattered light signal from the particles when the laser light of varying intensity irradiates the particles, performing a bandpass filter on the scattered light signal centered on the modulation frequency, and obtaining the particle velocity based on the bandpass filtered scattered light signal. The device proposed by the present invention is suitable for measuring particle velocity under strong background interference and can solve the problem of particle velocity measurement failure caused by strong background noise during the measurement process.

The present invention provides a distance calculation device that can calculate distance information relating to the distance a workpiece travels. [Solution] The system comprises a light source 10 that emits light, a first optical system 20 that converts the light from the light source into elliptical polarization and emits it toward a workpiece W1 that is transparent and moving in a specific direction, a second optical system 30 that converts the light from the workpiece into linear polarization and emits it, and an optical sensor 40 that acquires optical information of the workpiece based on the light from the second optical system. The first optical system includes a first polarizing filter 22 that converts to linear polarization and a first waveplate 23 that converts the linear polarization from the first polarizing filter into elliptical polarization. The second optical system 30 includes a second waveplate 31 that converts the light from the workpiece and a second polarizing filter 32 that is placed between the second waveplate and the optical sensor 40 and converts the light from the second waveplate into linear polarization.

The invention discloses a generator rotating speed measuring system and method, and the system comprises a motor body which is provided with a rotating shaft. The light source module is used for generating a light source; the photoelectric module is used for irradiating the light source generated by the light source module to the end face of the rotating shaft; the counting module comprises an integrated phase-locked loop and a frequency divider, the integrated phase-locked loop and the frequency divider are matched to multiply the number of pulses output from the shaping circuit within one second by 60 and then send the multiplied number to a counter and a display circuit, and the phase discriminator PD1 adopts an exclusive-OR gate structure; transmission mechanical gear speed measurement is changed into infrared photoelectric speed measurement, a phase-locked loop tracking speed measurement method is adopted, and a phase-locked loop has the characteristic of no frequency difference after locking, so that rapid measurement when a prime mover is at a low speed is realized, the rotation speed of a prime mover rotor can be followed in real time, and the problem of long measurement period of a traditional speed measurement method is solved.

The utility model relates to the technical field of nondestructive testing, and discloses a metering device for measuring the rotating speed of a liquid metal sliding bearing, which comprises a driving motor, a shaft to be tested, the liquid metal sliding bearing, an acoustic emission sensor, a signal collector, a photoelectric rotating speed sensor and a monitoring computer, and is characterized in that the driving motor is in transmission fit with the shaft to be tested; a to-be-tested shaft is arranged on the liquid metal sliding bearing; the acoustic emission sensor is arranged on the outer side of the liquid metal sliding bearing; the signal collector is electrically connected with the acoustic emission sensor; the signal collector is electrically connected with the photoelectric rotating speed sensor; and the signal collector is electrically connected with the monitoring computer. The device has the effect of conveniently measuring and verifying the rotating speed of the liquid metal sliding bearing.