200 results about "Interference filter" patented technology

The invention relates to the technical field of signal processing, and provides an intelligent sensing device electromagnetic interference suppression method and system based on AI identification, and the method comprises the steps: obtaining a multi-source electromagnetic signal set of a target intelligent sensing device in a preset monitoring period, and carrying out the electromagnetic interference feature extraction processing of the multi-source electromagnetic signal set, performing interference mode matching processing on the electromagnetic interference characteristic set based on a preset interference suppression model to generate an electromagnetic interference suppression strategy of the intelligent sensing equipment; the electromagnetic interference suppression strategy comprises a frequency band adjustment direction corresponding to an interference frequency band distribution characteristic, a signal gain compensation direction corresponding to an interference intensity fluctuation characteristic and an anti-interference filtering direction corresponding to an interference source correlation characteristic; and performing interference suppression operation on a signal acquisition module of the intelligent sensing equipment according to the electromagnetic interference suppression strategy so as to reduce the electromagnetic signal distortion rate of the intelligent sensing equipment.

The invention relates to the field of automatic control, and discloses an intelligent control dispensing method and system based on automatic optical detection, and the method comprises the steps: obtaining multi-source real-time data of a dispensing production line, carrying out the feature recognition processing through a preset feature extraction model, and obtaining the dynamically updated production state information; then interference filtering processing is carried out to obtain an effective data set, when it is detected that quality fluctuation exceeds a preset range, an alarm is triggered, deviation identification information is generated, self-adaptive parameter optimization processing is carried out in combination with equipment characteristics and historical operation records, and a control instruction is generated; a control instruction is issued to an execution unit through a double-channel transmission mechanism, transmission delay is monitored in real time, and channels are automatically switched; when the output deviation exceeds the tolerance range, a compensation instruction is generated, parameters of the feature extraction model are updated based on the novel quality fluctuation features, and the dispensing control process is iteratively optimized through closed-loop control. According to the method, the dispensing precision and the production efficiency can be remarkably improved.

The invention discloses a ship cable identification method based on an improved VGG16 network and bidirectional feature fusion. The method comprises an image acquisition module, a preprocessing module, a deep learning recognition module and an output module, and comprises the following steps: firstly, carrying out gray enhancement and anti-interference filtering on a construction drawing through the image preprocessing module, and constructing a ship cable marking database; then, an improved VGG16 network deep convolutional layer is adopted to extract cable multi-scale features, a full connection layer module of an original network is deleted, a lightweight channel self-attention module is added, and BiFPN is adopted to carry out bidirectional feature fusion on shallow texture features and deep semantic features of the improved VGG16 network, so that the features of the ship cable are captured more effectively; and finally, outputting structured data of cable numbers, specifications and path coordinates. The identification precision mAP, the processing speed and the generalization ability of the method are superior to those of a traditional method, the method can be effectively applied to the field of ship cable identification and the like, and the industrial detection efficiency and the automation level are greatly improved.

The invention relates to the technical field of airspace control, and discloses a low-altitude airspace precise control system and method for a low-altitude aircraft, and the system comprises an airspace digital twinning construction module, a multi-dimensional airspace distribution engine and a carbon constraint flight control module. When a low-altitude digital twin airspace is constructed, the system can solve the problem of signal distortion in airspace situation awareness by deploying a multi-source environmental interference filtering algorithm, analyzing waveform characteristics of sensor data in real time and dynamically identifying and eliminating the influence of electromagnetic interference and meteorological distortion on a monitoring signal; the authenticity and reliability of environment dynamic data acquisition are guaranteed, the construction precision of a digital twin model is improved, the accuracy of an airspace management and control decision is further guaranteed, and when dynamic monitoring of the flight path of the aircraft is implemented, a three-dimensional attitude real-time feedback mechanism is established, the space vector included angle between the actual course of the aircraft and a planned path is continuously calculated, and the real-time dynamic monitoring of the flight path of the aircraft is realized. Therefore, the system can sense the pose offset state in time, and the robust control capability of the low-altitude dense traffic flow is enhanced.

The invention relates to a narrow-band interference filtering method and device based on an HPLC (High Performance Liquid Chromatography) chip, and belongs to the technical field of power line carrier communication. When pulse processing is carried out on a signal, AGC / DAGC processing is paused if a narrowband interference detection starting signal is detected, a narrowband interference detection module calculates a narrowband interference frequency point by using the signal of which the AGC / DAGC processing is paused, and a filter coefficient used by a narrowband interference elimination module is determined based on the narrowband interference frequency point; and the narrowband interference elimination module carries out narrowband interference elimination processing according to the determined filter coefficient. Wherein the AGC / DAGC processed signal is paused when the signal participating in the calculation of the narrowband interference frequency point is subjected to pulse processing, so that signal fluctuation caused by AGC / DAGC processing is avoided, the calculation accuracy of the narrowband interference frequency point is improved, and the narrowband interference filtering effect is ensured.

The invention provides a power plant equipment sound abnormity identification and health prediction method based on granular computing and an LSTM network, and the method comprises the steps: employing an array pickup and a high-dynamic-range microphone array in a complex and high-noise background environment of a power plant, and combining an anti-interference filtering and beam forming algorithm, thereby achieving the sound abnormity identification and health prediction of the power plant equipment. According to the method, directional, multi-channel and non-contact sound acquisition is carried out on key parts of equipment, acquired sound signals are preprocessed, converted into time domain, frequency domain and time-frequency domain representations and coded into multi-dimensional numerical vectors, and compared with a rule-based expert system, the method has higher generalization ability and real-time response ability; a large language model is introduced, so that the output is closer to an engineering language and is suitable for operation and maintenance personnel to understand and execute; a self-defined knowledge base or safety semantic filtering is supported, and closed-loop deployment in an industrial field is facilitated; the system can be in butt joint with an intelligent inspection system, and full-link linkage of voice recognition, health assessment and suggestion generation is achieved.

The invention belongs to the field of navigation sensor error estimation, and particularly relates to a composite interference filtering method for error separation estimation of a dynamics-assisted gyroscope. The method comprises the following steps: firstly, acquiring error data of the micro-electro-mechanical gyroscope offline and preprocessing; the method comprises the following steps: decomposing sequence data by using wavelet transform, respectively establishing an autoregressive moving average model ARMA of a stationary subsequence and a long short-term memory network model LSTM of a non-stationary subsequence, and combining the ARMA and the LSTM to obtain a hybrid model of gyroscope errors; and then establishing a system equation based on the rotor unmanned aerial vehicle kinetic model and the error hybrid model. And estimating the error of the gyroscope in real time and updating an error model by using the real-time measured value of the gyroscope and the controlled quantity of the rotor unmanned aerial vehicle through a composite interference filtering method, and finally compensating the measurement of the gyroscope. On the premise of not increasing hardware, online estimation of the gyroscope error in the motion state is realized, and the navigation precision is improved.

A light detection device includes: a Fabry-Perot interference filter provided with a light transmission region; a light detector configured to detect light transmitted through the light transmission region; a package having an opening and accommodating the Fabry-Perot interference filter and the light detector; and a light transmitting unit arranged on an inner surface of the package so as to close an opening, the light transmitting unit including a band pass filter configured to transmit light incident on the light transmission region. When viewed from a direction parallel to the line, an outer edge of the Fabry-Perot interference filter is positioned outside an outer edge of the opening, and an outer edge of the light transmitting unit is positioned outside the outer edge of the Fabry-Perot interference filter.

A signal acquisition system and amplifier for resisting high-frequency interference include a signal terminal; a first filter circuit includes a first access point, a second access point, resistors R1, R2, and R3, and capacitors C1, C2, and C3; one end of resistor R1 is connected to the first access point, and the other end is connected to one end of resistor R2, the other end of resistor R2 is connected to the second access point, the end of resistor R1 connected to resistor R2 is also connected to one end of capacitor C3, and the other end of capacitor C3 is grounded; one end of capacitor C1 is connected to the first access point, and the other end is connected to one end of capacitor C2, the other end of capacitor C2 is connected to the second access point, the end of capacitor C1 connected to capacitor C2 is also connected to one end of resistor R3, and the other end of resistor R3 is grounded; the first filter circuit is connected in series with the first access point and the second access point to the signal terminal. Compared with traditional anti-interference filter structures, this invention can achieve better high-frequency interference resistance with a smaller on-chip cost.

An imaging system includes a plurality of sets of optical sensors and a plurality of sets of optical filters, each set of optical filters being associated with a set of optical sensors. Each set of optical filters further includes a plurality of sets of absorption filters and a plurality of interference filters, with each interference filter of the plurality of interference filters configured to pass light of a different wavelength range and with each absorption filter of a set of absorption filters configured to pass light of a different wavelength range. The system includes one or more processors adapted to sample a first output from optical sensors associated with an absorption filter associated with each set of filters. The system further includes one or more processors adapted to sample a second output from optical sensors associated with an interference filter associated with each set of interference filters.

A method of manufacturing a Fabry-Perot interference filter includes a forming step of forming a first thinned region, a first mirror layer, a sacrificial layer, and a second mirror layer are formed on a first main surface of a wafer, and the first thinned region in which at least one of the first mirror layer, the sacrificial layer, and the second mirror layer is partially thinned along each of a plurality of lines is formed; a cutting step of cutting the wafer into a plurality of substrates along each of the plurality of lines by forming a modified region within the wafer along each of the plurality of lines through irradiation of a laser light, after the forming step; and a removing step of removing a portion from the sacrificial layer through etching, between the forming step and the cutting step or after the cutting step.

The application discloses a kind of digital control circuit board anti-interference filter design methods under group pulse action, realize the accurate modeling of EFT noise to digital control circuit conduction interference coupling, and based on conduction interference coupling circuit model and failure threshold, the quantitative design of anti-interference filter is carried out.Compared with traditional method, the application provides a kind of method for establishing chip black box impedance model based on online test and vector matching method, solves the impedance model modeling problem of chip under no internal structure data, and establishes the conduction interference coupling model of digital control circuit under EFT noise, provides model basis for quantitative design;From the angle of quantitative design, the anti-interference filter design method of the application effectively improves the anti-interference level of digital control circuit.

The invention relates to an adaptive anti-interference terminal sliding mode control method and device for a servo drive system, and the method comprises the steps: reading a torque current and an actual measurement motor speed, and obtaining a filtered motor speed through a speed filter; calculating a driving torque and a friction torque; lumped interference in the operation process of the servo motor is observed on line through an interference observer, and a lumped interference observed value is output; the chattering phenomenon existing in the lumped interference observation value is relieved through the interference filter; calculating a speed error and a nonsingular terminal sliding mode surface; calculating an adaptive anti-interference terminal sliding mode control law; converting the control law into a torque current reference instruction, and inputting the torque current reference instruction into a current loop of a speed regulation system for execution; and updating the motor speed observation value and the lumped interference observation value. Therefore, the problems that in the prior art, under the non-negligible interference observation error caused by the large interference change frequency, it is difficult to guarantee high-stability operation of the servo motor, and the robust anti-interference capacity is poor are solved.

The invention discloses a disc Mmyshev mode-locked laser, and belongs to the technical field of ultrafast laser. The disc Mmyshev mode-locked laser comprises a laser gain module, a first nonlinear medium, a second nonlinear medium, a first interference filter, a second interference filter, a dispersion compensation module, an output coupling mirror, a first concave reflecting mirror, a second concave reflecting mirror, a high reflecting mirror, a third concave reflecting mirror and a fourth concave reflecting mirror. According to the disc Mmyshev mode-locked laser, a Mmyshev filtering mechanism is introduced into the disc Mmyshev mode-locked laser, and mode-locked self-starting and ultra-short pulse output under the condition of high average power are achieved. The disc Mmyshev mode-locked laser does not need an SESAM or Kerr mode-locked medium, can obtain stable ultrashort pulses smaller than 100 femtoseconds, has high stability, self-starting, good beam quality and structural expandability, and is suitable for application fields such as precise micromachining and extreme ultraviolet lithography driving sources.

A filter unit includes a substrate having an opening and a Fabry-Perot interference filter having a pair of mirror portions facing each other in a Z-axis direction and spaced apart by a variable distance. The Fabry-Perot interference filter is disposed on the substrate so as to overlap the opening in the Z-axis direction. A first recess portion is formed in the substrate with the Z-axis direction as the depth direction. The Fabry-Perot interference filter is disposed in the first recess portion. Viewed in the Z-axis direction, a distance from an inner edge of the first recess portion to an outer edge of the substrate in a Y-axis direction is greater than a width of the Fabry-Perot interference filter in the Y-axis direction.

The application relates to an overlying water intelligent sampling system based on ultrasonic dynamic distance adjustment, which comprises an ultrasonic distance measurement module, a T-shaped mounting support, a self-adaptive position adjusting mechanism and a multi-channel sampling unit. A high-frequency ultrasonic sensor emits sound waves to detect the sediment distance every 10 seconds. After the data is removed from water body fluctuation interference through an anti-interference filtering algorithm, the data is transmitted to a PID controller for dynamic analysis. The PID controller controls the self-adaptive position adjusting mechanism to adjust the height of a sampling head assembly according to the sediment distance data. The multi-channel sampling unit is used for continuous collection and storage of water samples in different time periods. The application realizes dynamic tracking of a target water layer by real-time detection of the sediment interface distance through high-frequency ultrasonic waves and adjustment of the height of the sampling head through a self-adaptive stepping motor.

This application provides a TDLAS gas sensor and its anti-interference filtering and noise reduction method, relating to the field of gas concentration detection technology. The method includes: acquiring the original analog-to-digital conversion data of the gas to be measured; using an adaptive median filtering algorithm to filter, reduce noise, and correct the baseline of the original data to obtain a time-domain signal; and calculating the gas concentration based on Beer-Lambert's law. The adaptive median filtering algorithm uses multi-resolution analysis to decompose the signal into low-frequency and high-frequency components, identifies noise regions and absorption peak regions by calculating local gradient changes, and performs multi-scale reconstruction after adaptive threshold classification. This invention addresses the problem of TDLAS gas sensors being susceptible to interference from environmental temperature and pressure fluctuations. By protecting the absorption peak region while filtering out the noise region, it significantly improves the signal-to-noise ratio and detection stability, and has the advantages of strong anti-interference capability, fast response speed, and significant noise reduction effect.

The application discloses an interference filter type multi-wavelength erbium-doped fiber laser based on optical path difference regulation, relates to the technical field of a ring-shaped tunable multi-wavelength erbium-doped fiber laser, and comprises a pump source, a wavelength division multiplexer, an erbium-doped fiber, an isolator, a first optical fiber coupler, a three-paddle polarization controller, a polarizer, a Mach-Zehnder interferometer filter containing an adjustable delay line, a black phosphorus saturable absorber and an extrusion type polarization controller which constitute a ring cavity. By connecting a 0-6.6 cm continuous adjustable delay line to one arm, the optical path difference of the filter two arms is accurately regulated, and continuous precise tuning of wavelength spacing of 0.3 nm to 1.54 nm is realized; meanwhile, by combining the nonlinear polarization rotation effect and the hybrid mode-locking mechanism of the few-layer black phosphorus, the mode-locking threshold is significantly reduced, and the long-term stability of the pulse is improved. The laser can realize stable emission of up to six wavelengths at the same time, the wavelength drift is less than 0.75 nm, and the power fluctuation is less than 7.0 dB.

The utility model relates to the technical field of foundation navigation, and discloses an anti-interference device for foundation navigation, which comprises an anti-interference device and a fixed base, a foundation navigator body is mounted on the surface of the top end of the fixed base, a buffer device is mounted on the surface of the top end of the fixed base, and an antenna is mounted on the surface of the top end of the buffer device. The fixed base is in threaded connection with the lower end of the anti-interference device. According to the anti-interference device for foundation navigation, the connecting piece, the metal block, the anti-interference filter and the connecting frame are arranged, the connecting piece is inserted into the metal block, and the connecting piece and the connecting frame can clamp and fix the anti-interference filter, so that the connecting piece is quickly and conveniently separated from the metal block, and the anti-interference filter is quickly and conveniently disassembled; the insertion frame drives the bearing frame to move outwards, so that the insertion frame and the connecting frame are fixed through threads, the anti-interference filter can be clamped and fixed, and the safety of the anti-interference filter can be protected.

The invention provides a signal blind detection method based on hidden Markov model variational mode decomposition. The signal blind detection method comprises the following steps: obtaining a boundary detection result of a received signal based on a hidden Markov model algorithm; determining the number of sub-band signals in the received signal and the range of each sub-band signal based on a variational mode decomposition model algorithm; hidden Markov model algorithm detection results in the existence range of each sub-band signal are combined, and then signal components and non-signal components in the detection results are effectively distinguished by using a plurality of intrinsic mode function IMF marginal spectrums; according to the method, the USB measurement and control signal can be correctly detected in the received signal, the method can be used in a non-cooperative communication scene and is not influenced by wavelet basis selection, the number of wavelet layers and a noise interference filtering threshold value, most of signal components of the USB measurement and control signal can be detected, and a complete USB measurement and control signal can be prevented from being detected into a plurality of sub-band signals.

The invention belongs to the technical field of image recognition, and discloses a real-time video AI recognition accuracy improving method and system based on an unmanned aerial vehicle. Comprising the following steps: collecting flight shooting video data of an unmanned aerial vehicle in real time and cleaning the data to obtain a high-definition frame video data sequence; carrying out lift-off jitter correction, and outputting jitter correction video data; performing out-frame prediction compensation to obtain out-frame compensation video data; performing real-time scene interference identification, executing confidence offset calibration based on an identified interference scene, and generating oscillation correction video data; removing ghost interference to obtain continuous and stable video data; carrying out artifact filtering, and outputting interference filtering video data; sending the interference filtering video data to an unmanned aerial vehicle identification terminal; the method improves the recognition stability and accuracy, and is higher in scene adaptability and higher in processing real-time performance.

Thise Fabry-Perot interference filter comprises a fixed layer including a fixed mirror part, and a movable layer including a movable mirror part facing the fixed mirror part, with a gap therebetween. The movable mirror portion includes a first portion corresponding to a light transmission region, and a second portion surrounding the first portion when viewed from the direction in which the fixed mirror portion and the movable mirror portion face each other. The area of a region in which the first portion is disposed and which corresponds to the light transmission region is larger than the area of an annular region in which the second portion is disposed and which surrounds the light transmission region. The distance between the outer edge of the first portion and the outer edge of the gap is greater than the thickness of the gap.

A lens portion includes a housing and an optical system disposed inside the housing. The optical system includes a Fabry-Perot interference filter, a first aperture which is formed integrally with the Fabry-Perot interference filter, and through which light traveling toward the Fabry-Perot interference filter or the light that has transmitted through the Fabry-Perot interference filter passes, a first lens portion that focuses or collimates the light traveling from an incident portion toward the Fabry-Perot interference filter, and a second lens portion that images the light that transmits through the Fabry-Perot interference filter and is emitted from an emitting portion. When viewed in an optical axis direction, a width of the light at an incident position on the first aperture is wider than a width of the first aperture.

A filter unit includes a substrate having an opening, a Fabry-Perot interference filter disposed on the substrate so as to overlap the opening in a Z-axis direction, and a conductor substrate disposed on the substrate so as not to overlap the Fabry-Perot interference filter in the Z-axis direction and electrically connected to the Fabry-Perot interference filter. A first recess portion and a second recess portion are formed in the substrate with the Z-axis direction as the depth direction. The first recess portion and the second recess portion are arranged in an X-axis direction perpendicular to the Z-axis direction. The Fabry-Perot interference filter is disposed in the first recess portion. A conductor substrate is disposed in the second recess portion. The substrate includes a separator disposed between the first recess portion and the second recess portion.

The application relates to the technical field of wireless communication, and discloses a DAB signal processing device, a DAB receiving system and a vehicle, wherein the device comprises: an input filtering module configured to perform out-of-band interference filtering processing on an initial DAB radio frequency signal to obtain a filtering preprocessed signal; a low-noise amplification module configured to perform intermodulation interference detection on the filtering preprocessed signal, perform intermodulation suppression processing on the filtering preprocessed signal according to the intermodulation interference detection result to obtain a first intermediate signal, and perform dynamic gain control on the first intermediate signal according to the amplitude-frequency characteristic of the first intermediate signal to obtain an amplified radio frequency signal; and an output filtering module configured to perform sideband shaping processing on the amplified radio frequency signal to obtain a target DAB radio frequency signal. The application not only improves the anti-saturation capability of a front-end circuit, but also effectively realizes in-band intermodulation suppression and sideband slope optimization, and significantly improves the anti-radiation interference performance of a DAB system.

The invention provides an event camera laser earth-moon ranging and satellite multi-target tracking system, and solves the problems of detector saturation, insufficient dynamic range and low multi-target separation efficiency caused by solar noise in the daytime of traditional laser ranging. The system comprises an infrared enhanced event camera module (comprising an asynchronous event sensor, a rotary wedge prism and a two-stage interference filter with the bandwidth less than or equal to 2nm), an active laser synchronization control unit (FPGA (Field Programmable Gate Array) for realizing microsecond synchronization and dynamically adjusting an event trigger threshold, and a multi-modal data processing unit (executing a density threshold gt; through a triple anti-noise mechanism (spectrum / space / time domain filtering), the daytime earth-moon distance measurement precision is less than or equal to 0.5 m (distance gt; 384,000 km), the multi-target tracking capacity is greater than or equal to 5 satellites, and the power consumption is reduced to be less than or equal to 5W (gt of a traditional system; 50W) is provided.

The invention relates to the technical field of coal mine underground roadway supporting, in particular to a coal mine tunneling roadway anchor cable automatic tensioning control method and system, and the method comprises the steps: initializing tensioning parameters, a top plate pressure safety threshold value and a pressure deviation allowable range; tensioning pressure original signals, real-time top plate pressure and environment interference data are collected in real time, and the environment interference data comprise humidity and vibration frequency. By collecting environment interference data such as underground humidity and vibration frequency and combining anti-interference filtering processing to correct a tension pressure original signal, the problems of pressure signal attenuation and high-frequency fluctuation caused by an underground complex environment are effectively solved, and it is ensured that tension pressure data are accurate; and according to the comparison result of the real-time top plate pressure and the safety threshold value, the tensioning target pressure and the pressure stabilizing time are adjusted in a self-adaptive mode, and the problem that the anchor cable pre-tightening force is insufficient or too large due to the fact that existing system parameters are fixed is solved.

An ambient light sensor comprising at least three main channel sensing units and at least one cooperative channel sensing unit. Each main channel sensing unit includes a filter and a photosensitive element, with the filter positioned on the light receiving path of the photosensitive element, wherein the filter of at least one main channel sensing unit is an absorptive filter. Each cooperative channel sensing unit includes a filter and a photosensitive element, with the filter positioned on the light receiving path of the photosensitive element, wherein the filter of at least one cooperative channel sensing unit is an interference filter. This configuration effectively controls the error range of spectral reproduction results in ambient light sensor products affected by process variations, thereby improving product yield.

The invention relates to the technical field of complex medium moisture content detection, and discloses a portable complex medium moisture content intelligent detection terminal and system based on a terminal side lightweight algorithm, and the system comprises a detection terminal, an integrated multi-type sensor module, a low-power-consumption embedded processing unit and a lightweight algorithm. Electromagnetic scattering noise is eliminated through the microstrip antenna and the anti-interference filter circuit, and the moisture content of a single point can be calculated locally in real time. Each terminal uploads data to a sink node through a LoRa module by adopting a TDMA mechanism, the node calculates the regional moisture content through a space-time calibration and dynamic weighted fusion algorithm, generates a continuous thermodynamic diagram by means of inverse distance weighted interpolation, and finally realizes visualization and alarm functions through a mobile terminal APP. The problems that traditional equipment depends on cloud computing power and is poor in portability and high in detection delay are effectively solved, and high-precision, low-power-consumption and real-time moisture content detection is achieved through terminal-side intelligent computing and miniaturized hardware design.

The application provides a miniaturized multi-channel 5G anti-interference filter and a design method thereof, and relates to the technical field of filters.The filter comprises a first resonant cavity and a second resonant cavity separated by a zigzag-shaped isolation plate;the first resonant cavity and the second resonant cavity each have a single resonant chain;each resonant chain comprises coaxially connected input end, input end tap resonant column, multiple normal resonant columns, output end tap resonant column and output end in sequence;each resonant column is elliptical, and the major axis of each resonant column is arranged in line in the resonant chain;the resonant column comprises the input end tap resonant column, the input end tap resonant column and the normal resonant column;the zigzag-shaped isolation plate comprises multiple pairs of isolation plate groups;each pair of isolation plate groups comprises a first isolation plate and a second isolation plate in a V-shaped groove combination mode;each V-shaped groove corresponds to a resonant column.The filter significantly improves the signal isolation and anti-interference capability, and ensures the stability and synchronism of multi-channel parallel transmission.