86results about How to "Realize filtering" patented technology

The invention discloses an ultrasonic phased array inspection oil-gas pipe circular weld defect automatic recognition method, in particular to an ultrasonic phased array inspection oil-gas pipe circular weld defect automatic recognition method for a support vector machine, which belongs to a pipe circular weld defect type recognition technology. The recognition method includes two parts of the construction of a support vector machine model and the automatic recognition of unknown defect types in circular weld. The construction steps of the support vector machine model include artificial defect signals extraction, wavelet decomposition promotion, feature extraction, feature optimization and the training of the support vector machine model. The automatic recognition steps of unknown defect types in circular weld include defect signals extraction, optimized feature calculation and automatic recognition based on the support vector machine. The invention combines a lifting wavelet transform with a fractal technology and has the advantages of high recognition accuracy and fast recognition speed. The automatic recognition of the defect types can be realized.

The invention discloses a lane line detection method and device and a computer readable storage medium. The lane line detection method comprises the following steps: acquiring multi-frame point clouddata; optimizing the pose of the multi-frame point cloud data to obtain the positions of all frame point clouds; obtaining the position of the multi-frame point cloud data; obtaining the position of the multi-frame point cloud data; obtaining a local map by cloud local mapping base on that multi-frame point cloud data; converting the format of the local map into an image format; detecting the lanelines in the local map of the image format, and obtaining the lane line data. The laser measuring principle is adopted to obtain the multi-frame point cloud data for realizing the detection of the lane line, the blind area of the field of vision when the lane line is detected by the single frame image or the single frame point cloud can be avoided, the lane line data in a larger range can be detected, and the algorithm is relatively simple.

The invention discloses a radial polarized lighting ellipsoidal surface pupil amplitude filtering confocal imaging device which belongs to the optical microscope measurement field. After passing through a collimated beam expander, a polarizer, a radial polarized converter and a spectroscope in sequence, laser beams emitted by a laser of the confocal imaging device are converged onto the surface of an ellipsoidal reflector by an objective lens with large numerical aperture, are returned along a symmetric path after being reflected twice by the ellipsoidal reflector and a sample, and are reflected when passing through the spectroscope again. The reflected beams are firstly converged by a coupling lens, and are transmitted to a photomultiplier through an optical fiber for imaging. The focus of the objective lens with large numerical aperture overlaps with the distal focus F1 of the ellipsoidal reflector; and the proximal focus F2 of the ellipsoidal reflector is located on the surface of the sample. The ellipsoidal reflector is in a zonal structure; the reflectivity of two separated zones is identical; and the reflectivity of two adjacent zones is respectively 0 and 1. By using the confocal imaging device disclosed by the invention, the transverse resolution can be improved, and the ratio of the maximum axial electric energy current density to the maximum radial electric energy current density at the focus can be increased.

The invention discloses a programmable analog unit for processing a sensor signal, which comprises a first programmable switched capacitor group, a second programmable switched capacitor group, a programmable main fully differential operation amplifier, a first programmable auxiliary fully differential operation amplifier, a second programmable auxiliary fully differential operation amplifier, an output multiway selector and an output control module, wherein the first programmable switched capacitor group is used for receiving an external sensor differential signal; the second programmable switched capacitor group is used for receiving an external sensor differential signal; the programmable main fully differential operation amplifier is used for generating and outputting a main fully differential signal after signal processing; the first programmable auxiliary fully differential operation amplifier is used for generating and outputting an auxiliary fully differential signal; the second programmable auxiliary fully differential operation amplifier is used for generating and outputting an auxiliary fully differential signal; the output multiway selector is used for selecting and outputting one way of differential output signal; and the output control module is used for generating and outputting a positive-negative reverse-phase or modulated differential output signal. The programmable analog unit for processing the sensor signal can read out small capacitance and small voltage sensing signals and process analog signals, is applied to sensor signal detection of physical quantities such as an angular velocity, an accelerated velocity and the like, and is suitable for circuits of an FPAA (field programmable analog array), a FPMA (fixed preassigned multiple access) and a PSOC (programmable system on chip).

The invention relates to a reflection color filter, which comprises a three-color pixel array, wherein each color of pixel is an optical grating structure; and the optical grating structure comprises a substrate, a dielectric optical grating and a metal layer, wherein the metal layer completely covers the dielectric optical grating, the thickness of the metal layer is smaller than the half of the groove width of the dielectric optical grating, and the thickness of the dielectric optical grating corresponds to complementary color light of filtering color of the optical grating structure. The reflective color filter is used for carrying out color filtering on the basis of a substrative theorem, not only ahs higher optical energy utilization rate but also has the characteristics of low angle sensitiveness, benefit for manufacturing and the like.

The invention discloses a plasma curved waveguide filter based on a microcavity coupling structure. The plasma curved waveguide filter comprises a metal film, and a curved waveguide and a resonant cavity which are formed on the metal film. The curved waveguide consists of an incident waveguide, a middle waveguide and an outgoing waveguide. The resonant cavity is disposed at one side and/or two sides of the middle waveguide. A straight waveguide is changed to a curved waveguide formed by two right angles, so that the middle waveguide can form an F-P cavity; moreover, two rectangular resonant cavities are added at two sides of the middle waveguide, a resonant coupling effect of the surface plasma polariton (SPP) is used to realize a filter function of the plasma polariton by adjusting the length of the resonant cavities; and in addition, the filtering and electromagnetic induction transparent effect can be realized by adjusting a distance between the resonant cavity and the waveguide, the length of the resonant cavity and the quantity of the resonant cavity, and a special coupling effect can be reflected.

The invention relates to an astronautic programmable thermocouple temperature transmitter. A circuit part is composed of a power circuit, a programmable amplifying circuit, a programmable cold junction compensation circuit, an operation amplifying circuit and an output protecting circuit, wherein the functions of power filtering, reverse connection protection, transient impact protection, and the like, are achieved by the power circuit; a thermocouple signal is adjusted to be in a suitable voltage range by the programmable amplifying circuit; the programmable cold junction compensation circuit is used for sensing the temperature of a cold junction of the thermocouple, converting a temperature signal of the cold junction into a voltage signal and compensating the temperature of the cold junction of the thermocouple; output signals of the programmable amplifying circuit and the programmable cold junction compensation circuit are operated and amplified to be 0-5V by the operation amplifying circuit; and the output protecting circuit is used for limiting an output voltage within a scope of -0.5V to +6.5V and protecting a next-stage system from being damaged when the circuit is in fault. The astronautic programmable thermocouple temperature transmitter has the advantages of high intelligent degree, adjustable range, no requirement for hardware debugging, suitability for batch production and suitability for thermocouples of K type, E type, T type and tungsten rhenium type.

The invention provides an anti-broadband interference Beidou vehicle-mounted all-in-one machine. The anti-broadband interference Beidou vehicle-mounted all-in-one machine is composed of a host machineand a cable; the host machine comprises an anti-interference antenna array element, a receiving channel module, a power amplifier/combiner, an anti-interference module, a transmitting filter, a baseband signal processing board, a power source information board, a power source filter and the like; the core of the all-in-one machine of the invention is the anti-interference module; according to theanti-interference module, a frequency domain narrowband interference suppression and space-time adaptive notching processing cascaded mode is adopted, namely, frequency domain narrowband interferencesuppression is performed on intermediate-frequency signals, space-time adaptive processing is performed on a notching result, and therefore, broadband interference can be suppressed. According to theanti-broadband interference Beidou vehicle-mounted all-in-one machine of the invention, anti-interference performance, system complexity degree, reliability, power consumption and other factors are balanced. The anti-broadband interference Beidou vehicle-mounted all-in-one machine can resist narrow-band interference and multi-broadband interference simultaneously, perform up-conversion on interference-cancelled signals so as to obtain radio frequency signals, and process navigation signals according to a conventional method.

The invention relates to a visual detection method for slots on the surface of a bridge pier, which obtains a color image of the surface of the bridge pier through a linear array CCD camera. The colorimage is compressed and stored in blocks, and the color image is converted into gray-scale image, and the noise is reduced. Based on the linear characteristics of bridge pier slot, the image mask filter algorithm is used to enhance and smooth the gray image. the interval of the region A and the region B is calculated by the region distance method, In the region distance, the distance ratio between the region A and the region B is maximized by changing the parameter value, and the threshold value is used as the comprehensive segmentation threshold value of the pier slot image. The wavelet transform gradient image segmentation algorithm is used to detect the edge of the pier slot image. Finally, the edge detection method of multi-scale morphological image is used to extract the edge of thepier image, and the morphological watershed algorithm controlled by markers is used to identify the gap in the pier image, which can realize the efficient identification and detection of the pier gap.

The invention discloses a tone regulation and control circuit based on a NE5532 chip; the tone regulation and control circuit comprises the following parts: a pre-stage amplification circuit with twoinput ends respectively connected with a left channel audio signal and a right channel audio signal, the pre-stage amplification circuit comprises an amplifier U1A and an amplifier U1B, the amplifierU1A and the amplifier U1B are integrated in the NE5532chip, and respectively are used for amplifying the left channel audio signals and the R channel audio signals; a tone control circuit with two input ends respectively connected with output ends of the amplifier U1A and the amplifier U1B, the tone control circuit is used for respectively adjusting low pitch, middle pitch and high pitch for the two paths of audio signals amplified by the amplifier U1A and the amplifier U1B; a volume adjusting circuit used for adjusting volumes of the two paths of audio signals. The tone regulation and controlcircuit can better amplify, rectify and filter sounds and make fidelity treatment, and can remove unnecessary interferences, thus further obtaining better sound quality.

The embodiment of the invention discloses a filtering type cross directional coupler with wide band-pass response and a design method. The filtering type cross directional coupler comprises a parallelcoupling line, a parallel open-circuit line, a series transmission line and four matching ports, wherein the parallel coupling line comprises two sections of parallel coupling lines and three sections of capacitor loading parallel coupling lines; the two sections of parallel coupling lines respectively comprise two coupling lines, the three sections of capacitor loading parallel coupling lines respectively comprise two coupling lines and a lumped capacitor arranged between the coupling lines, and the parallel open-circuit line comprises four parallel open-circuit lines; the series transmission lines comprise four series transmission lines; by setting the impedance value of the parallel open-circuit line, two transmission zeros can be generated outside the passband to form a stop band, andthe smaller the characteristic impedance of the parallel open-circuit line is, the wider the stop band is; according to the invention, the passband bandwidth range can be changed by adjusting the characteristic impedance of the series transmission line. Based on the method, broadband, filtering and any power division ratio can be realized.

The invention discloses a laser voice restoration method and circuit based on a PSD. The laser voice restoration method based on the PSD comprises the design of a PSD photovoltaic conversion circuit module; the design of a current pressure converting circuit module and the design of a differential amplification circuit module. The laser voice restoration circuit based on the PSD comprises the PSD photovoltaic conversion circuit module which is used for indirectly obtaining a relative value of a vibration amplitude of glass and generating current signals with strength changing; the current pressure converting circuit module which is used for respectively converting current pressure of two-way weak current signals output by the PSD photovoltaic conversion circuit module and is connected with the PSD photovoltaic conversion circuit module; and the differential amplification circuit module which is used for carrying out simultaneous difference and main amplification and filtering of two-way signals, is connected with the current pressure converting circuit module and enables a signal amplitude to reach about 3 V to facilitate the collection of rear-end signals and the restoration of laser voice signals. According to the laser voice restoration method and circuit based on the PSD, an RC (resistor-capacitor) network is used in combination with an AD 704 to achieve the filtering of the signals through the current pressure converting circuit module; so that the signal quality is improved; and the AD 8274 is utilized to complete the differential amplification of two-way voltage signals.

A multi-channel image acquisition and processing system comprises simulation CCD cameras, filtering networks, video decoding chips, an FPGA chip, a multi-core DSP unit and a computer, wherein the simulation CCD cameras are used for acquiring video data and carrying out filtering processing of the data through the corresponding filtering networks; data obtained through the filtering processing goes through analog-to-digital conversion through the video decoding chips; data obtained through conversion of the video decoding chips is transmitted to the FPGA chip; the FPGA chip sends a plurality of video digital signals to the multi-core DSP unit; and the multi-core DSP unit processes data and sends processed data to the computer. The system provided by the invention has the advantages that video data acquisition, filtering and decoding of the multiple simulation CCD cameras can be achieved, multiple scene images can be acquired in a parallel manner, and parallel real-time processing and display of the multiple scene images can be achieved through the multi-core characteristic of a DSP.

The invention discloses a method for reducing intraframe noise, comprising the procedures as follows: Reading the K-1 rows pixel of the current frame and the current K rows pixel are obtained with the arrival of the K-th pixel; taking the currently arrived pixel row as the current pixel row and filtering the intermediate pixel point in each pixel block with size KXL in the acquired current K rows pixel; judgign whether the current pixel row is the last pixel row of the current frame. If not, updating the pixel row in the acquired current K rows pixel the rows difference between which and the current pixel row is K-1 by utilizing the current pixel row. The current K rows pixel are obtained with the arrival of the next pixel row of the current frame and returned to execute the filter operation; otherwise, the procedure is finished. The invention has the advantage that the invention discloses a device of reducing intraframe noise simultaneously, which can eliminate intraframe noise effectively under low-light level and improve images quality.

The invention provides a shape description method based on fractional Fourier transform. The method comprises: a first step of estimating the center of mass and the principal axis direction of a target object in an image; a second step of performing rotation and translation on the image; a third step of removing portions outside a target enclosing rectangle from the rotated and translated image to obtain a target image, and performing normalization on the size of the target image; a fourth step of calculating the fractional Fourier transforms with different orders of the normalized image; a fifth step of discarding the amplitudes of the fractional Fourier transforms, and only preserving the phases of the fractional Fourier transforms; and a sixth step of taking phase histograms of each order of fractional Fourier transform of the normalized image as shape features of the object. The shape description method provided in the invention has characteristics of rotation invariance and translation invariance, and the phase of the fractional Fourier transform is utilized. According to the method, filtration of an image in different scales is realized, and the characteristic that described features are not only related to the boundary contour of an object but also related to the internal region of the object is ensured.

The invention discloses an FPGA (Field Programmable Gate Array)-based alternating current electromagnetic field crack detector which comprises an FPGA digital circuit, a DDS (Digital Display Scope) exciting source, a power amplification circuit, an exciting coil, a detection sensor, a preamplifier, a signal conditioning board, an AD (Analog-digital) conversion circuit, a key circuit and a communication circuit. An FPGA is used as a control chip of an alternating current electromagnetic field detection system to design an exciting source module with an adjustable frequency and a phase and design an alternating current electromagnetic field detection sensor, a signal conditioning circuit, the AD conversion circuit and the communication circuit. The FPGA-based alternating current electromagnetic field crack detector has the technical effects that through the design of an FPGA chip control-based alternating current electromagnetic field detection digital circuit system, control over an peripheral hardware circuit module by the alternating current electromagnetic field crack detector is realized, the shortcomings of narrow measurement range, low measurement precision and single measurement of the current detector are overcome, and the flexibility and the intelligence of detection are improved; the FPGA-based alternating current electromagnetic field crack detector can be applied to overhead work and a complicated detected workpiece.

The invention relates to a handheld testing device used for testing of a refrigerator electric control board and a testing method. The handheld testing device is in direct communication with the refrigerator electric control board; the corresponding forced load working mode of the handheld testing device is set according to the fault phenomenon of the whole machine, then a corresponding control instruction and a corresponding code are generated, the control instruction is sent to the refrigerator electric control board, and the refrigerator electric control board controls corresponding loads to work independently and feeds back the operation situations of the corresponding loads; when starting of the corresponding loads fails, it is judged that the electric control board has a fault; when starting of the corresponding loads succeeds, an output port of the corresponding loads of the refrigerator electric control board is tested according to the displayed corresponding code, and whether the electric control board has a fault or not is judged. The after-sale repair convenience and accuracy are improved; the repairing frequency is reduced; the after-sale repair expenses of users are reduced; the market reject ratio of electric control boards is reduced; the brand credibility is improved.

The invention relates to a sound wave signal while drilling receiving device. The device comprises a sound wave signal receiving equipment cylinder and a lower connector, wherein an outer protective protection sleeve is sleeved outside the sound wave signal receiving equipment cylinder; the sound wave signal receiving equipment cylinder is of a hollow structure with a cavity inside and an equipment bracket for holding signal receiving and processing equipment is arranged in the cavity; and the lower part of the lower connector is of a hollow structure, the lower part of the lower connector is of an amplitude transformer structure, the sound wave signal receiving equipment cylinder is connected with the upper end part of the amplitude transformer structure, and the outer protective protection sleeve is connected with the root part of the lower end of the amplitude transformer structure. Generally, the sound wave signal while drilling receiving device is a drilling tool short section; and in use, the device is connected in a drill stem and is a part of the drill stem, so underground sound waves coming along the drill stem can be absorbed completely without signal loss or mixing with extra external interference signals.

The invention provides a building photovoltaic integrated hollow amorphous silicon solar cell assembly and a manufacturing method. The solar cell assembly is a stacked structure, including front encapsulation glass (1), amorphous silicon cell layer (2), Adhesive film connecting layer (3), tempered glass (4), color crystal glass back plate (5); toughened glass (4) and color crystal glass back plate (5) are fixed by hollow aluminum strips (6) around them, and The edge of the hollow aluminum strip (6) is coated with polysulfide glue (7) for sealing, and a color crystal decorative coating (8) is provided on the inner side of the color crystal glass back plate (5). The target product of the present invention is a product that adopts prefabricated tempered transfer film decoration process to cover the back area of ​​crystalline silicon wafer and amorphous silicon battery respectively and display colorful crystal pattern decoration. This target product can also be combined with Low-E energy-saving glass, which not only has a beautifying effect, but also reduces the thermal conductivity of the component when used as a curtain wall, achieving better effects of shielding sunlight, heat insulation, and light filtering.

The invention discloses a shielding G-line terahertz surface wave filter. The invention aims to realize a terahertz filter which has the advantages of high quality factor, low loss, selectable frequencies and strong anti-electromagnetic interference capability. According to technical schemes of the invention, two grounding planar waveguide metal strip G lines (4) which are parallel to each other and are symmetrical with each other relative to a center line are arranged on a dielectric substrate (2) which is fixedly suspended in a metal shielding cavity (1) along the box body length direction of the metal shielding cavity (1) and is separated by air layers (3); metal ridge filtering sheets (5) which are symmetrical with each other in opposite directions, face the center line and are arranged at intervals are manufactured on the inner sides of the grounding planar waveguide metal strip G lines (4) along the length direction of the grounding planar waveguide metal strip G lines (4); and therefore, the passband frequency of the shielding G-line terahertz surface wave filter can be adjusted through using the metal ridge filtering sheets (5), and terahertz radio frequency signals can beinputted to the shielding G-line terahertz surface wave filter from one end and are outputted from the other end of the shielding G-line terahertz surface wave filter; and the shielding G-line terahertz surface wave filter can perform filtering and frequency selection on the terahertz radio frequency signals.

The invention discloses a metal nanoparticle-insulator composite material grating coupler and a preparation method and an application thereof. The grating coupler is composed of a metal nanoparticle-insulator composite material coupling grating and an insulator optical planar waveguide. The metal nanoparticle-insulator composite material coupling grating is a two-dimensional orthogonal rectangular diffraction grating which is prepared on the surface of the insulator optical planar waveguide implanted with metal ions by use of electron beam lithography and reactive ion beam etching technologies based on a formed metal nanoparticle-insulator composite material modified layer. Compared with an insulator grating coupler of the same structure, the grating coupler of the invention has higher coupling efficiency, and there is no loss caused by free carrier absorption. In addition, the grating coupler is insensitive to the polarization direction of light. In the realization process of light coupling, light can be filtered, split and deflected with the aid of the formation of guided wave and diffraction distortion. The metal nanoparticle-insulator composite material grating coupler can be used in the field of preparation of large-scale integrated optical circuits.

The invention is applicable to the field of computers, and provides a ball stud size detection method and device, computer equipment and a storage medium. The ball stud size detection method comprisesthe steps of acquiring a first image, preprocessing the first image to obtain a second image, wherein the second image at least comprises a profile diagram of a ball stud; carrying out edge detectionon the contour map, and determining an edge line of the ball stud; and carrying out straight line detection based on Hough transformation on the edge line, determining a straight line part in the edge line, detrmining two end points of the straight line part, adopting the Euclidean distance to measure the distance between the two end points, and obtaining and outputting the straight line size ofthe ball stud. According to the ball stud size detection method provided by the embodiment of the invention, the image of the ball stud is identified and measured through a computer program, the imagenoise is eliminated through image preprocessing, image edge detection and linear detection, and meanwhile, the size is measured through the computer program, so that the speed is high, the efficiencyis high, the product quality is ensured, and the production cost is reduced.

The invention relates to the technical field of electronic circuits, and provides a photovoltaic power generation system for teaching. The system comprises a photovoltaic module, a DC/DC circuit and aDC/AC circuit connected in sequence, and further comprises a zero-crossing detection circuit; the output end of the DC/AC circuit is used for being connected with a power grid, the DC/DC circuit andthe DC/AC circuit are connected with a main control circuit, and the zero-crossing detection circuit comprises a comparison circuit and a filter circuit; the input end of the comparison circuit is used for being connected with a voltage sensor, and the filter circuit comprises a triode Q1, a triode Q2 and an NAND gate chip U2. According to the technical scheme, the problems that in the prior art,a photovoltaic power generation system for teaching is poor in output waveform, and student experience is affected are solved.

The invention discloses a programmable sensor signal processing device adopting a switched capacitor mode. The programmable sensor signal processing device comprises a first programmable switched capacitor bank, a second programmable switched capacitor bank, a programmable master fully differential operational amplifier, a first programmable slave fully differential operational amplifier, a secondprogrammable slave fully differential operational amplifier, an output multiplexer and an output control module. A fully differential switched capacitor working mode is adopted, the fully differential circuit has the advantages of being high in common-mode rejection ratio, large in signal swing and high in linearity, common noise can be effectively suppressed, the signal to noise ratio is increased, harmonic distortion is reduced, and the programmable sensor signal processing device is particularly suitable for reading sensor signals.

A strong light protecting module of a photoelectric detection device comprises a photoswitch, a photoelectric detection device and a control circuit. The photoswitch receives optical signals. The input end of the photoelectric detection device is connected with the output end of the photoswitch and the received optical signals are transformed to electrical signals through the photoelectric detection device. The input end of the control circuit is connected with the output end of the photoelectric detection device, and the signals from the photoelectric detection device are processed through the control circuit. By means of the strong light protecting module of the photoelectric detection device, the optical signals arriving at the surface of the photoelectric detection device are directly processed, the photoswitch is adopted so as to achieve filter function of the nonworking wavelength and time division on-off of the working wavelength, so that the system is enabled to be compact and simple and easy to integrate. The strong light protection of the receiving end of the photoelectric detection device is effectively carried out, and reliability and practicability of an optical module are improved.