33 results about "Interference filter" patented technology

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.

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.

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.

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 application discloses a kind of patch inductance test equipment, it is related to patch inductance test equipment technical field, it includes: test operating platform, the test operating platform is provided with test mechanism above, the test mechanism includes connecting frame, test component, test station, anti-interference test box, anti-interference filter component, drive assembly, test block and contact inductance foot position, the connecting frame is provided with test component above, the top of the test component is provided with test station, the inside of the test component is provided with drive assembly, the test component below is provided with anti-interference test box, the inside of the anti-interference test box is installed with anti-interference filter component, the anti-interference filter component is electrically connected with the test block, the top of the test block is welded with contact inductance foot position.The application has the function of anti-interference test, realizes the effect of improving the anti-interference ability and detection efficiency of test equipment.

The application provides an anti-interference emergency communication signal enhancement device, which comprises a multi-band antenna array, the multi-band antenna array is connected with a preprocessing circuit, the preprocessing circuit is connected with a machine learning processing chip and a power amplifier, the machine learning processing chip is connected with an environment sensor group, the preprocessing circuit, the machine learning processing chip and the environment sensor group are powered by a dual power supply system, the multi-band antenna array, the preprocessing circuit and the power amplifier are isolated in a high-frequency chamber by a split shielding cavity, and the machine learning processing chip, the dual power supply system and the environment sensor group are isolated in a low-frequency chamber by a split shielding cavity. The machine learning processing chip is used to realize real-time interference filtering parameter adjustment, improve dynamic response capability and anti-interference capability, meanwhile, the split shielding cavity is used to ensure that the high-frequency circuit and the low-frequency circuit work without interference, improve electromagnetic compatibility capability and maintain device operation stability.

The application provides an image redness correction method, device, medium and product, and relates to the technical field of electric digital data processing.The method comprises the following steps: receiving a first waveband light signal and a second waveband light signal reflected by an identification object through a preset bandwidth interference filter; capturing the spatial light intensity distribution of the first waveband light signal and the second waveband light signal through a photoelectric sensor, obtaining a first original light intensity distribution matrix and a second original light intensity distribution matrix, and performing differential processing to obtain a light intensity spatial distribution graph. Then, the light intensity spatial distribution graph is converted to an HSV color space to generate a first HSV image, the first HSV image is divided into a plurality of first target regions and first interference regions according to a target HSV range. Finally, each first interference region is compensated and corrected to generate a first corrected image. The scheme solves the technical problem that the red light residue is serious in image recognition in the prior art.

An electronic device may be provided with conductive structures such as conductive housing structures. A visible-light-reflecting coating may be formed on the conductive structures. The coating may have adhesion and transition layers and a thin-film interference filter on the adhesion and transition layers. The thin-film interference filter may be a four-layer interference filter stacked directly onto the adhesion and transition layers and having an uppermost SiCrN layer, a lowermost SiN layer, and interleaved SiH and SiN layers. If desired, an opaque coloring layer such as a Cr layer may be disposed between the interference filter and the adhesion and transition layers. The coating may exhibit a deep red or orange color that has a relatively uniform visual response even when the underlying conductive structures have a three-dimensional shape.

The present application relates to physiological signal processing technical field, disclose a kind of multi-modal physiological signal acquisition equipment's anti-interference filter method, system, terminal and storage medium, comprising: the multi-modal physiological signal of acquisition is preprocessed;Modal identification and feature extraction are carried out to the multi-modal physiological signal after pre-processing;According to modal identification result, corresponding filter is selected, and filter parameter is dynamically adjusted;Filtering path and order are adjusted based on cascaded filter structure and dynamic switching mechanism;Based on crosstalk processing and reference channel compensation mechanism, adaptive interference estimation and offset are carried out;According to the extracted feature, parallel filtering is carried out, and the evaluation parameter of each filtering result is compared based on output result selection mechanism, and according to the comparison result, the final signal is selected and output.The present application realizes the effective suppression of power interference, motion artifact, crosstalk and multi-source interference such as high-frequency noise, improves the real-time and stability of filtering effect.

The present application relates to a wide voltage intelligent electronic horn and a control method thereof, wherein the wide voltage intelligent driving circuit of the electronic horn is integrated with an anti-interference filter network, a self-starting voltage stabilizing module of a depletion mode MOS tube, a double-PWM output microcontroller and a decoupling power driving module; and the control method dynamically adjusts the driving duty cycle by real-time sampling of the input voltage. The present application has a wide voltage adaptation range, strong anti-interference performance, can realize constant power output under wide voltage, and has strong versatility and is suitable for multiple types of vehicles.

The embodiment of the application provides an interference filtering circuit, a signal detection circuit, a slave device, a signal detection method and a bus arbitration method, belongs to the technical field of electronics, and can effectively improve the accuracy of signal detection of the slave device, reduce design complexity, cost and power consumption, simplify a control process, and improve the work efficiency of the slave device. The interference filtering comprises: a delay unit that generates a second signal by performing delay processing on a first signal, the first signal being a serial clock bus signal or a serial data bus signal supported by a system power management interface protocol; an AND gate that generates a third signal according to the first signal and the second signal, an OR gate that generates a fourth signal according to the first signal and the second signal, and a flip-flop that generates a fifth signal according to the third signal and the fourth signal, the fifth signal being a signal in which interference signals in the first signal are filtered out.

The utility model relates to the technical field of anti -interference filter component, and disclose an anti -interference filter component of electromagnetic compatibility laboratory, the protective shell is fixedly installed with the installation base at the top, and the outer wall both sides of installation base are fixedly installed with mounting plate, the inside of mounting plate is worn and is led out the fastener, the below of installation base is provided with heat abstractor, the heat abstractor includes bottom shell, bottom shell fixed mounting is at the bottom of installation base, the utility model discloses the design through bottom shell, filter screen, loading plate, through -hole, fixed plate and the heat dissipation fan, realized the electronic component of filter in the intermediate position of protective shell and installation base inside, avoid being in the bottom end heat too concentrated, and let gas after filtering from below into protective shell and installation base inside, through the through -hole and let gas circulate, improve the overall nature of gas circulation, avoid the situation that heat cannot be dispersed, improve the whole filter heat dissipation effect.

The application provides a machine vision-based object recognition prefabricated component quality detection method and system, relates to the prefabricated component quality detection technical field, and comprises the following steps: based on the BIM model of a prefabricated component, an optimal camera visual angle sequence is generated through an optimization algorithm, a multi-axis adjusting platform drives the camera to perform image acquisition on the key detection area of the prefabricated component according to the visual angle sequence; the collected images are subjected to light self-adaptive compensation and environmental interference filtering pretreatment; a object recognition model with a fusion attention mechanism is used to perform multi-type quality object synchronous identification on the pretreated images; the BIM model and the genetic algorithm are used to optimize the camera visual angle sequence, and the multi-axis adjusting platform is used to realize blind area-free image acquisition on the key detection area of the prefabricated component, compared with the traditional fixed visual angle acquisition mode, the defect missing detection problem is solved completely, the comprehensiveness and pertinence of image acquisition are improved significantly, and a foundation is laid for subsequent accurate identification.

A tunable interference filter includes: a first substrate provided with a first reflection film; and a second substrate provided with a second reflection film facing the first reflection film with a gap between the first reflection film and the second reflection film. The first substrate includes a movable portion that is a portion where the first reflection film is provided, a diaphragm portion surrounding the movable portion, and a base portion supporting the movable portion via the diaphragm portion to allow displacement of the movable portion in a thickness direction, the diaphragm portion is a portion in which a thickness at the first substrate is thinner than a thickness of the base portion due to a groove opened in a surface of the first substrate, and a width of a bottom portion of the groove is larger than a width of an opening of the groove.

The application discloses a plating process of a metal packaging shell of a radio frequency interference filter, which comprises the following steps: S1, electroplating a nickel layer on the outer wall of the shell, the inner wall of a blind hole and a lead wire; S2, electroplating a gold layer one on the nickel layer, wherein the thickness of the gold layer one is 0.01-0.05 um; S3, electroplating a gold layer two on the gold layer one, wherein the thickness of the gold layer two is 0.09-0.15 um; S4, electroplating a gold layer three on the outer wall of the shell and the lead wire located outside the blind hole, wherein the gold layer three is deposited on the gold layer two, and the thickness of the gold layer three is 0.2-0.6 um; and S5, electroplating a gold layer four on the lead wire located outside the blind hole, wherein the gold layer four is deposited on the gold layer three, and the thickness of the gold layer four is 2.5-4.2 um. The gold layer is electroplated by multiple steps, so that the thickness of the gold layer electroplated on each part can better meet the requirements, and the thickness fluctuation is small.

This invention relates to a wavelength-variable interference filter and its driving method, and an optical module, providing a wavelength-variable interference filter that can improve the accuracy of wavelength adjustment in a wide band. As described above, the wavelength-variable interference filter (1) includes: a first reflective film (4) and a second reflective film (5) facing each other; and an electrostatic actuator unit (6) that changes the gap amount (G) between the first reflective film (4) and the second reflective film (5). The electrostatic actuator unit (6) includes: a bias electrode (61) to which a bias voltage corresponding to a target value of the gap amount (G) (i.e., a gap target value (Gt)) is applied; a control electrode (62) to which a control voltage controlled by feedback according to the gap amount (G) is applied; and a variable electrode (63) to which the bias voltage and the control voltage can be switched.

An adaptive intelligent optimization zeroing anti-interference method based on interference detection is proposed. This method suppresses various types of interference and minimizes FPGA resource usage, making it easy to implement in engineering. The adaptive zeroing anti-interference method and device based on interference detection have advantages such as strong interference filtering capability, large number of satellites received, strong anti-interference capability, low computational resource usage, and good engineering feasibility. It also has good interference suppression capability against various types of interference.

An electronic device may have a touch sensitive display with optical touch sensors that are insensitive to the presence of moisture. The optical touch sensors may include light sources and light detectors. Light illuminator and detector angular filters (e.g., masks, baffles) can be employed to limit the illumination and receive angles of emitted and detected light to minimize false object detection. In some examples, light illuminator and detector masks and baffles can be formed during the photodiode component fabrication process. Interference filters may be included over the light sources and / or the light detectors to improve discrimination between a user's finger and water, and may have a greater transmission for light at a first incident angle that is greater than the critical angle of the water / cover interface than at a second incident angle that is less than the critical angle.

The utility model discloses an anti -interference filter with waterproof function belongs to filter waterproof technical field, aims at solving the technical problem of filter waterproof performance deficiency under prior art. This anti -interference filter with waterproof function includes filter main part, bottom plate and casing, the bottom plate horizontal adhesion is in filter main part bottom, the casing is covered in filter main part top, and casing and filter main part's upper surface and two lateral surfaces adhesion, and casing is connected with bottom plate, the bottom plate and casing all adopt metal material to make, the bottom plate is with filter main part bottom and is pressed between the sealing washer, the both ends of casing are penetrated, and the both ends of casing inner wall are provided with first sealing strip, and first sealing strip is pressed between casing and filter main part surface. This anti -interference filter with waterproof function has good anti -interference performance and waterproof performance, has improved filter's filtering effect and work stability.

A vehicle-mounted refrigerator vibration acceleration detection device includes a main frame with two support platforms connected to its bottom. A shock absorber is located below the main frame, and an air spring is attached to the inner wall of the shock absorber. The top of each air spring penetrates the main frame and extends to the top of the frame. This device, through the integrated air springs in the shock absorber below the main frame, effectively filters out external vibration interference, providing a stable base for detection, avoiding the influence of environmental vibration on the detection results, and ensuring data reliability. A collaborative robot equipped with a CCD camera achieves visual positioning of the door panel detection location. Combined with a switchable probe-type short rod round cap contact and a direct buffer spring acceleration sensor detection component, it balances the direct transmission of vibration signals with interference filtering capabilities. By offline testing of parameters such as the extension rod length and spring coefficient, it can be specifically adapted to different detection scenarios, balancing signal integrity.

The application discloses a polarization assimilator and a multi-wavelength polarization light beam combining method and system, wherein the polarization assimilator comprises a first polarization rotator, a polarization beam splitter, a phase modulator, a polarization beam combiner, a second polarization rotator and a polariscope arranged in sequence along an optical path. Through the polarization assimilator core design based on the polarization interference filtering principle, the application realizes efficient conversion and beam combining of multi-wavelength polarization light, can achieve nearly zero-loss beam combining output, significantly reduces the insertion loss of the optical module, and helps to reduce the overall power consumption of the system. In addition, the polarization assimilator can adopt a modularized layer-by-layer architecture, and can theoretically realize beam combining of an unlimited number of wavelengths, thereby providing a highly expandable and compact optical engine solution for future higher-rate optical communication modules.

The present disclosure relates to semiconductor pixels combined with a diffraction grating and an interference filter and imaging sensors. An image sensor comprises back-illuminated pixels formed in and on a semiconductor substrate. Radiation in the near infrared spectrum reaches the back-illuminated photodetector of the pixel through an illuminated upper surface of the photodetector. A hybrid structure combining a diffraction grating at this upper surface and an interference filter with an irregular layer deposited on the diffraction grating makes it possible to trap photons in the silicon of the photodetector. The radiation is diffracted in the photodetector at an angle sufficient for it to be reflected on a metal layer deposited on the opposite surface of the back-illuminated photodetector and in a trench isolating adjacent photodetectors, then reflected by the interference filter. The photons are trapped in the substrate; their absorption is improved and thus the quantum efficiency of the back-illuminated pixel.

Methods, devices and systems are described to eliminate or reduce unwanted polarization aberrations associated with interference filters. An example method for producing a polarization aberration compensator for a thin film interference filter includes obtaining a set of Mueller matrix values based on polarization measurements of the thin film interference filter over a spectral range, and generating a metric based on a difference between a compensated Mueller matrix and an identity matrix over the spectral range. The compensated matrix represents a cumulative Mueller matrix for a combination of the thin film interference filter and the polarization aberration compensator. A configuration of the polarization aberration compensator is determined based on evaluating the metric that eliminates or reduces the difference between the compensated Mueller matrix and the identity matrix over the spectral range. Configuration parameters, including thicknesses of birefringent layers, fast-axis angles and the number of birefringent layers in the compensator are obtained.

This invention discloses an intelligent power module, its overcurrent detection circuit, and a home appliance. The overcurrent detection circuit includes an overcurrent detection unit for outputting an overcurrent detection signal when an overcurrent is detected in the intelligent power module; a filtering unit connected to the overcurrent detection unit for filtering out interference signals from the overcurrent detection signal; and an anti-interference enhancement unit connected to the filtering unit for generating an anti-interference enhancement signal based on the control signal of the intelligent power module, and enhancing the interference filtering capability of the filtering unit based on the anti-interference enhancement signal. Therefore, the overcurrent detection circuit of the intelligent power module in this embodiment can significantly improve the stability of overcurrent detection, effectively reduce the probability of malfunctions due to false triggering during overcurrent detection, and simultaneously ensure overcurrent detection sensitivity under normal interference conditions.

This utility model relates to the field of power control circuit technology and discloses a low self-power power switch control circuit, including an external power supply, a control signal input module, a switch drive module, a main power switch module, a protection clamping module, a filtering and stabilizing module, and a control signal anti-interference filtering module. The output terminal of the external power supply is electrically connected to the input terminal of the main power switch module, the output terminal of the control signal anti-interference filtering module is electrically connected to the input terminal of the control signal input module, and the output terminal of the main power switch module is electrically connected to both the protection clamping module and the filtering and stabilizing module. The protection clamping module is connected in parallel between the control terminal and the power input terminal of the main power switch module. In this utility model, through the coordinated connection of the modules, precise control of the power path is achieved, reducing its own power consumption when the circuit is not working or in a sleep state, thus meeting the power management requirements of low-power devices.