115results about How to "Exclude external interference" patented technology

The invention relates to a method for measuring coal bunker material level based on laser and binocular vision and a device thereof, belonging to the field of machine vision. The device comprises two CCD cameras with the same parameters, two lenses with consistent parameters, one or a plurality of lasers, a light source, a processing element and an explosion-proof case provided with a window. A rotating mechanism is also included when one laser is used. The method includes that the laser emits variable size laser beams, so as to form a light spot on coal surface, image parallax of the light spot between the two cameras is utilized to measure material level, and an image pair is acquired by the two cameras; corrosion expansion pre-treatment is carried out on the obtained images by utilizing an improved algorithm; for the two images after being pretreated, a new rapid stereoscopic vision algorithm is utilized to calculate a depth map; depth is obtained according to the depth map, and finally high efficiency, real time and accurate coal bunker material level measurement is realized. The device has two measuring modes, namely real-time detection mode and sensor detection mode.

The invention provides a test method for field programmable gate array single particle effect, relating to an integrated circuit technology. The invention comprises the following steps: 1) the package of FPGA is removed, and FPGA is arranged on a test circuit board; 2) FPGA is configured, and then SRAM data are read back and recorded; 3) the test circuit board is arranged in a test room and a particle source emits single particles to bombard FPGA; 4) SRAM data are read back and recorded; 5) data of steps 2) and 4) are compared, and reversed digits of SRAM are determined; 6) when the reversal times reach a preset value or after the period of time without reversal reaches a preset time value, the particle source is changed, FPGA is electrified again, the FPGA is confirmed to return to the initial state, and then steps 3) and 5) are repeated; 7) the data are processed: the reversal section of the LET value is calculated and a reversal curve is generated. The method can precisely test the impact of the single particle effect and eliminate external interferences, thus ensuring the correction and reliability of the test results.

The invention provides a non-contact photoelectric measurement method and device, which obtains the depth value of materials in a bunker on the basis of the number of pixels between a laser facula imaging spot and an image center spot in an image, belonging to the technical field of material position measurement. The invention is especially suitable for measuring the depth of the bunker coal position. In the device of the invention, a digital camera and a laser emitter are fixed on the top of the principal axis of a barrel-shaped bunker, so that the light path of the camera is vertical to the surface of material. The laser emitter is arranged on the position at the angle theta with the horizontal direction so as to ensure that the imaging zone of the laser facula can be projected on the material surface within the field range of the camera. The camera focuses by N-gear segment so as to satisfy the situation that clear images can be shot on all different coal positions of the bunker. DSP (Digital Signal Processor) serves as the inner core of a processor. The number of pixels between the laser facula imaging spot and the image center spot is calculated, and a depth table which is calibrated in advance and corresponds to different pixel number mean values is inquired to finish depth detection. The measurement device is composed of the digital camera, the laser emitter, the image processor and a real-time display module.

A complete optical probe scanning near field optical microscope is disclosed, comprising laser lighting system, monitoring system, sample support, light fiber probe scanning mechanism, three-dimensional rack and pinion adjustment, feedback control and data collecting system. Its basic idea that light fiber probe is fixed on tuning fork, through three -dimensional scanner, light fiber probe is made to scan on the surface of sample nearby, when light fiber probe is approaching the surface of sample, it will be influenced by effect of atom shearing force which will change concussion of tuning fork so that the information of distance between light fiber probe and sample can be obtained. The information is feedback to Z direction control system to make light fiber probe keep a distance to a constant value with surface of sample, whose appearance will be reflected by the information feedback, and light intensity collected by light fiber probe provides permeability of sample. The invention has the advantages of large scanning range, no limitation of sample, high modularization, convenient combination and change.

The invention discloses an automatic-tracking double paraboloids light-concentrating, power-generating and heating system, which comprises a big parabolic reflecting surface and a small parabolic reflecting surface. The concave surfaces of the two paraboloids are opposite to each other, and the normal axes are on a same straight line with focal points or focal lines superposed with each other. An infrared filter plate is arranged on or adjacent to the focal points of the two paraboloids; a photovoltaic electroplate is fixed on the bottom of the concave surface of the big parabolic reflecting surface; the photovoltaic electroplate is connected with a metal heat-conductive sheet; a cooling metal slim tube is attached to the metal heat-conductive sheet; the photovoltaic electroplate is connected with the rotating shafts of transverse direction and longitudinal direction via a mechanical supporting mechanism. A look-down detector is arranged in front of the small parabolic reflecting surface, and the spherical axis of the detector is parallel to the axis of the paraboloid; the look-down detector is connected with a controller which is connected with an actuating motor for controlling the rotation of transverse rotating shaft and the longitudinal rotating shaft. The system is reasonable in structure, solves the problems of much interference, low precision and poor stability of the existing sunlight tracking system, reduces detection error and improves tracking precision and stability.

The invention discloses an RAPID (reconstruction algorithm for probabilistic inspection of damage) chromatography-based nondestructive identification method of mechanical structure damages. An RAPID chromatography algorithm based on partial imaging is established by providing a new sensor array form and taking the new sensor array form as a basis, the interference among different damages and the influence of an external interference source of a detected area are eliminated through data truncation and partial reconstruction in sub areas in the nondestructive identification of the mechanical structure damage, therefore, not only is the external interference eliminated, but also the accurate diagnosis and location of multiple damages or single damage are effectively achieved.

The invention discloses an image registration method based on feature points, and relates to the technical field of image registration. The method comprises the following steps: a, preprocessing a reference image and an image to be registered by adopting a wavelet transform threshold denoising method; b, extracting feature points by an SIFT algorithm; c, describing the feature points by adopting adeformation dimension reduction method; d, performing rough matching on the feature points according to cosine similarity; and e, eliminating part of mismatching by adopting an improved RANSAC algorithm to obtain a matching point pair with relatively high matching precision. Images are preprocessed by using a wavelet transform threshold denoising method before feature points are extracted, part of noise in the image is eliminated, so that the purity of the feature points is improved, a deformation dimension reduction method is provided for describing the extracted feature points when the feature points are described, SIFT descriptor dimensions are reduced, the algorithm operation time is shortened. The matched feature point pairs are optimized by adopting a method of combining rough matching and fine matching, so that the matching accuracy of the algorithm is improved.

The invention relates to a device for simply and conveniently detecting performance parameters of an infrared imaging system, which comprises an infrared lens, a hollowed metal target, a temperature control chip, a temperature sensor and a shell, and is characterized in that the shell is a heat-insulated metal sleeve; the temperature control chip is positioned at one end of the heat-insulated metal sleeve, and the infrared lens is positioned at the other end of the heat-insulated metal sleeve; the hollowed metal target is arranged near the focal surface of the infrared lens in the heat-insulated metal sleeve through a target supporting device; the temperature sensor is arranged on the hollowed metal target; and a hollowed part of the hollowed metal target is positioned on a light path between the temperature control chip and the infrared lens. The device utilizes the imaging principle to simulate a distant target, meets the requirement of the operating distance of a thermal infrared imager, guarantees the temperature stability due to the shell with good heat-insulating property, reduces the environmental requirements under the condition of detection, effectively eliminates external interferences such as air circulation, heat conduction, heat radiation and the like, and reduces the space size of the thermal imager under the condition of detection. Moreover, the whole detection device has small volume and is convenient to operate and quick to detect.

A connector includes a plastic core having upper and lower receiving slots, upper and lower rows of terminal slots, and isolating plate slots provided at a central portion, two slide ways provided at two lateral inner sides, and a connecting head provided at a front end thereof; a plurality of terminals located in the terminal slots; a plurality of isolating plates located in the isolating plate slots; two first conductive plates located in the upper and lower receiving slots; an insertion element having two lateral ends slidably engaged with the slide ways on the plastic core, and having a central receiving slot for receiving a second conductive plate therein; and two outer covers enclosing the insertion element in the plastic core, and having two third conductive plates received in receiving recesses provided thereon to contact with the first conductive plates.

The invention relates to a method for melt spinning and cooling a multifilament thread and to a device for carrying out said method. According to said method, a plurality of filaments is extruded from a polymer melt, said filaments being guided in a filament bundle and cooled by a cooling air stream that passes transversally across the filament bundle, the temperature of the cooling air that is evacuated during the cooling of the filaments being measured and monitored. To detect the cooled state of the filaments and the characteristics of the thread derived from said state, the temperature of the cooling air is measured at least at one measuring point inside the filament bundle. To achieve this, a temperature sensor is located inside the filament bundle between the spinneret and a thread guide that is allocated to the latter.

The invention relates to a road traffic signal light control system based on a GSM network. A laser correlation apparatus which is installed on each lane outflux of a crossroad measures the number of vehicles which pass through the lane outflux at green light. According to traffic data of the front crossroad, release time is calculated, simultaneously a distance between the vehicles during the release time is measured and a release traffic congestion condition is determined. The strong GSM network is used and communication among the crossroads is realized through a mode of sending short messages to each other.

The invention relates to the technical field of triboelectrification, and especially relates to a triboelectrification and electrostatic dissipation detection analysis device for a space environment.The device comprises a vacuum system, a cosmic ray radiation system, an alternating temperature system, a sliding friction and contact separation friction integrated drive unit, and an electrostatic detection system. The device can achieve the observation and analysis of the triboelectrification and electrostatic discharge parameters of a material in the space environment in real time, and has a higher application value for the selection and design of the triboelectrification and electrostatic discharge and electrostatic resistant materials of a spacecraft.

The invention discloses a dynamic force sensor sensitivity calibration method and device. The method comprises steps that silicone grease is filled between a calibration force sensor and a standard acceleration sensor fixing surface; M mass blocks are respectively arranged on a standard acceleration sensor for measurement, and the M is not smaller than 2, a vibrator is driven to generate vibration, output voltage signals of a standard acceleration gauge and a to-be-calibrated force sensor and acceleration detected by the standard acceleration gauge are acquired, and sensitivity of the to-be-calibrated force sensor is calculated according to the acquired signals. According to the method and the device, a fixing method of the to-be-calibrated force sensor and the standard acceleration sensor is realized, a specific dynamic calibration precision expression of the force sensor is acquired through derivation, no-suspension mounting requirement is proposed for the standard mass blocks, operation difficulty is reduced, and measurement precision and reliability are easily guaranteed.

The invention discloses a gamma radioactive source augmented reality method and system, and mainly solves the problems existing in the prior art that accurate locating and tracking of the moving unknown radioactive source and real-time display of the radioactive source cannot be realized. The system comprises at least four scintillator detectors which are discretely distributed and configured in atwo-dimensional or three-dimensional space; a camera which is arranged at the edge of the space area and used for performing video image photographing of the space; an industrial control computer which is connected with the scintillator detectors and the camera and used for acquiring the counting rate and the energy spectrum detected by the scintillator detectors to realize nuclide identification, locating and surface dose rate calculation of the radioactive source; and a terminal machine which is connected with the industrial control computer and used for transformation of the three-dimensional locating coordinates and the two-dimensional video image coordinates, fusion of the radioactive source icon and the video image and storage and display of the video image and the radioactive source parameters. The gamma radioactive source augmented reality method and system have the advantages of accurate locating of the radioactive source, nuclide identification, surface dose rate calculation, continuous tracking and visual real-time image display.

The invention relates to a crossroad traffic signal lamp time variable control system. According to the invention, laser correlation devices mounted at lane outlets of a crossroad are used to identify vehicles waiting for release at the lane outlets and calculate the number of vehicles which reach to a current crossroad after being released at a last crossroad, so that the traffic light timing plan is determined timely.

Technical scheme of the invention provides a method and device for testing the quality factor of a transmission coil in a high-frequency wireless power transmission system. Aiming at a condition thatthe stray capacitance of a transmission coil cannot be neglected, the method and device employs a feed coil and an additional high-frequency resonant capacitor for indirect testing, accurately test the internal resistance of the transmission coil under the high-frequency condition, and determines the quality factor of the transmission coil according to the internal resistance. Through the testingof the self-inductance and mutual inductance of the coil under a low-frequency condition, the method and device eliminate the impact from a parasitic parameter of the coil, employ an external tuning capacitor as a compensation capacitor to adjust the self-resonant frequency of the transmission coil, facilitate the testing of the coil at the working frequency, indirectly testing the internal resistance and quality factor when the coil works at the working frequency through the coupling effect of the feed coil and the transmission coil, and eliminates the external interference.

The invention discloses a field direct-current partial discharge test system and method for a converter transformer. The system comprises a direct-current high-voltage generator, a voltage regulator,a control device and a partial discharge instrument; the control device is connected with the direct-current high-voltage generator; the voltage regulator is connected with an input unit sleeve in thedirect-current high-voltage generator; the direct-current high-voltage generator is connected with a valve side winding of the converter transformer through a voltage-sharing ring and an anti-coronawire; and the partial discharge instrument is connected with the valve side winding of the converter transformer. By adopting the system, the field direct-current partial discharge test of the valve side winding of the converter transformer is realized; the direct-current high-voltage generator is connected with the valve side winding of the converter transformer through the voltage-sharing ring and the anti-corona wire so as to eliminate field corona discharge interference or magnetic suspension discharge interference; and by adopting the multi-channel partial discharge instrument, whether the polarity of direct-current voltages in a plurality of channels is consistent with the polarity of a voltage provided by the direct-current high-voltage generator or not is recognized to judge, recognize and eliminate external interference pulses, so that the field test accuracy is improved.

The invention provides a dust material quantity detection device for a dust collection device of a sewing machine. The dust material quantity detection device at least comprises a processor (5), an ultrasonic detection unit (6) and an alarming unit (7), the processor (5) controls air suction action of an air suction motor (4) and detection action of the ultrasonic detection unit (6) according to a speed control signal, and the ultrasonic detection unit (6)is controlled by the processor (5) to detect dust material quantity in a dust collection bucket (2) by transmitting ultrasonic waves into the dust collection bucket (2). Dust collection work and detection work are done at different times according to the speed control signal of a pedal speed controller, and the rotating speed of the air suction motor is stopped or lowered when the sewing machine does not work, so that energy sources can be effectively saved, energy consumption can be lowered, automatic stopping and alarming can be realized after the dust material quantity reaches an extreme limit, and the motor can be protected effectively. Multiple working frequency points are introduced, working frequency is changed according to actual circumstances, outside interference is eliminated, and reliability is guaranteed.