269 results about "Interference filter" patented technology

The invention relates to the technical field of discharge detection, in particular to a high-precision detection method and device for partial discharge of totally-enclosed GIS equipment. The method comprises the following steps: carrying out metal shell three-dimensional structure modeling on the GIS equipment, and carrying out electromagnetic shielding evaluation so as to obtain a multi-point electromagnetic shielding evaluation value; acquiring an original discharge signal of each sampling point based on the electromagnetic wave sensor, and performing interference suppression processing and back propagation attenuation compensation according to a multi-point electromagnetic shielding evaluation value, so as to obtain an attenuation compensation discharge signal waveform; micro-vibration response parameters are collected based on an MEMS micro-vibration sensor, actual influence waveform point detection marking and physical vibration interference filtering are carried out on attenuation compensation discharge signal waveforms, and therefore pure optimized discharge signal waveforms are obtained. According to the invention, through efficient and accurate partial discharge detection, real-time early warning of the state of the GIS equipment is realized, and the stability and safety of the equipment are improved.

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 relates to the field of intelligent control, and discloses a refrigerator multi-parameter collaborative awareness and resonance intelligent wakeup control method, which comprises the following steps: dynamically acquiring temperature, humidity and door state signals and adjusting the weights of the signals, extracting the resonant frequency offset by combining the vibration spectrum of a compressor, and performing intelligent wakeup and refrigeration duration prediction based on the characteristics. And credibility evaluation, a self-learning mapping model and an interference filtering mechanism are introduced. Compared with a traditional single-parameter or fixed threshold value control mode, the control logic is driven through physical quantity changes, under triggering of a door state event, a three-dimensional linkage relation of an environment state, a physical signal and a control decision is formed, timely sensing and accurate response to changes of the internal thermal characteristics of the refrigerator are achieved, and the problems of data splitting and lag control are solved.

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.

Described herein are methods and systems for protecting a light detection and ranging (LIDAR) device against external light that is originated at a light source other than a light source of the LIDAR device and that is being emitted towards the LIDAR device. In particular, the LIDAR device may be equipped with a mitigation system that includes an interference filter, an absorptive filter, an adaptive filter, and / or a spatial filter. Additionally or alternatively, the LIDAR device may be operated to carry out reactive and / or proactive mitigation operations. For example, the LIDAR device may be operated to vary over time characteristics with which light is being emitted and to only detect light having characteristics that match the characteristics with which light is being emitted. In another example, the LIDAR device may be operated to activate a shutter to block the external light from being detected by the LIDAR device.

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 relates to the technical field of intelligent bathrooms, in particular to an intelligent toilet bowl and a human body position detection method, device and system for an intelligent bathroom space, the intelligent bathroom space is divided into at least one static interference area and a dynamic detection area, and a cross-domain detection window is arranged at the boundary of the static interference area; a reflection signal in the intelligent bathroom space is detected through a microwave radar; analyzing a reflection signal in a preset peripheral distance range of the static interference area to generate human body target trajectory data; when it is judged that the human body target enters the static interference area, the position information of the human body target is locked in the static interference area, and interference filtering processing is carried out on reflected signals detected in the static interference area. Through the method, it can be effectively determined that the target human body is located in the static interference area, misjudgment caused by interference influence in the static interference area is avoided, and the accuracy of human body position detection is improved.

A Mach-Zehnder interferometer (MZI) filter comprising one or more passive compensation structures are described. The passive compensation structures yield MZI filters that are intrinsically tolerant to perturbations in waveguide dimensions and / or other ambient conditions. The use of n+1 waveguide widths can mitigate n different sources of perturbation to the filter. The use of at least three different waveguide widths for each Mach-Zehnder waveguide can alleviate sensitivity of filter performance to random width or temperature variations. A tolerance compensation portion is positioned between a first coupler section and a second coupler section, wherein the tolerance compensation portion includes a first compensation section having a second width, a second compensation section having a third width and a third compensation section having a fourth width, wherein the fourth width is greater than the third width and the third width is greater than the second width.

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.

An inverter system controller for an automotive vehicle includes a housing and has disposed within the housing a Y-capacitor defining a terminal, a ground busbar, and a surface mount resistor in direct contact with the terminal and ground busbar to form an electromagnetic filter that lacks a printed circuit board.

The invention discloses a camouflage target detection method based on multi-scale feature fusion and interference suppression, and the method comprises the steps: firstly constructing and training a camouflage target detection model which comprises a preprocessing network module, a difference feature interaction module, a detail feature fusion module, a boundary sensing module and an interference filtering module; and inputting a to-be-detected image into the detection model, wherein the output of the detection model is the camouflage target image obtained by detection. A progressive feature extraction architecture is adopted, in the initial feature extraction stage, a network constructs basic feature representation through multi-scale convolution operation, and a primary feature graph with global semantic information is generated. In the second stage, edge information is introduced to assist feature extraction, and in the third stage, interference filtering and refining processing is carried out on a feature map through IFM. According to the method, multi-scale features and interference suppression are fused, and the detection performance of the camouflage target is remarkably improved through parallel coding and multi-scale feature fusion in combination with edge feature information and an interference filtering module.

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 method for generating an image begins by sampling an output for each optical sensor of a plurality of optical sensors of an array of optical sensors, where the array of optical sensors is overlaid by a plurality of sets of interference filters and a plurality of sets of spatially distributed absorption filters, with each set of interference filters of the plurality of sets of interference filters configured to provide a multi-band wavelength response for an absorption filter of the plurality of sets of absorption filters. The method continues by generating a sampled output for each optical sensor of the plurality of optical sensors to provide a plurality of sets of sampled outputs. The method then continues by de-mosaicing a set of sampled outputs of the plurality of sets of sampled outputs to generate spectral bandpass information for the image.

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 lens unit (2) is provided with a housing (21) and an optical system (22) disposed in the housing. An optical system (22) is provided with: a Fabry-Perot interference filter (10); a first aperture (P1), which is formed integrally with the Fabry-Perot interference filter (10), and through which light directed toward the Fabry-Perot interference filter (10) or light transmitted through the Fabry-Perot interference filter (10) passes; a first lens unit (23) that focuses or parallelizes light from the incident unit toward the Fabry-Perot interference filter; and a second lens unit (24) that forms an image of the light that has passed through the Fabry-Perot interference filter and has been emitted from the emission unit. When viewed from the optical axis direction, the width of the light at the incident position of the first aperture (P1) is wider than the width of the first aperture (P1).

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.

An optical interference filter includes one or more sets of layers. Each set of layers includes a first layer that includes at least aluminum and nitrogen (e.g., an aluminum nitride (AlN) material), a second layer that includes at least silicon and oxygen (e.g., a silicon dioxide (SiO2) material), and a third layer that includes at least hydrogen and silicon (e.g., a hydrogenated silicon (Si:H) material). The second layer is disposed between the first layer and the third layer.

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.

An optical filter device includes: a Fabry-Perot interference filter that includes: a first structural body having first and second surfaces; a second structural body having a third surface; a first mirror portion provided to the first structural body; a second mirror portion provided to the second structural body so as to face the first mirror portion via an air gap; a first driving electrode provided to the first structural body; a second driving electrode provided to the second structural body; first and third terminals electrically connected to the first driving electrode; and a second terminal electrically connected to the second driving electrode. A distance between the first driving electrode and the air gap is shorter than a distance between the second surface and the air gap. A resistance measurement unit is electrically connected to the first and third terminals and measures a resistance value of the first driving electrode.

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.

A wavelength variable interference filter includes a first substrate, a second substrate facing the first substrate, a first reflective film provided on the first substrate, and a second reflective film provided on the second substrate and facing the first reflective film via a gap. The second substrate includes a diaphragm substrate having a uniform thickness in a Z direction and a support substrate bonded to the diaphragm substrate. The support substrate includes a movable portion overlapping the first reflective film and the second reflective film, and a support portion provided along an outer peripheral edge of the second substrate, and a hole portion for exposing the diaphragm substrate is provided between the movable portion and the support portion.

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.

A variable wavelength interference filter includes: a first substrate; a first multi-layered film provided at the first substrate; a first electrode portion provided at an electrode region of the first multi-layered film; a second substrate disposed so as to be opposed to the first substrate; a second multi-layered film provided at the second substrate; a second electrode portion provided at an electrode region of the second multi-layered film so as to be opposed to the first electrode portion; and a coupling section disposed between a coupling region of the first multi-layered film and a coupling region of the second multi-layered film. A reflective region of the first multi-layered film and a reflective region of the second multi-layered film are disposed so as to be opposed to each other with a gap being interposed between them. The first multi-layered film and the second multi-layered film each include an optically stacked body and an end-surface layer formed at an end surface of the optically stacked body. At least a portion of the end-surface layer is electrically coupled to the first electrode portion or the second electrode portion.

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.