36 results about "Optical noise" patented technology

The invention discloses a photovoltaic glass defect detection method and system based on image recognition, particularly relates to the technical field of visual inspection, and is used for solving the problem that defect recognition is interfered by optical artifacts caused by a film layer interference effect on the surface of coated glass. The method comprises the following steps: extracting interference characteristics through a reflection image to generate an optical artifact distribution diagram, positioning an interference region in a transmission image frequency domain space, constructing a process response template in combination with a sedimentary pulse frequency, and executing polarization coherence screening and time-varying deconvolution collaborative filtering to eliminate artifacts; based on energy ratio dynamic decision reinspection or defect classification process implementation, inherent optical noise and real physical defects of a material are effectively separated, and the accuracy and reliability of coated glass defect detection are remarkably improved.

An optical multi-pass cell system, a gas absorption data detection method, and a terminal device. The optical multi-pass cell system comprises: an optical multi-pass cell (11), which comprises an input end (101) and an output end (102); and a driving mechanism (12), which is used for driving M sub-mirrors of the optical multi-pass cell (11) to perform periodic reciprocating motion in a Z-axis direction during each data collection process of a gas absorption data detection process, wherein the Z-axis direction is parallel to the optical axis of the optical multi-pass cell (11), M≥1, and the detection process comprises: when the optical multi-pass cell (11) is filled with a gas to be detected, a detection beam is inputted from the input end (101), is reflected multiple times in the optical multi-pass cell (11), and then forms an interference beam that is outputted from the output end (102). Optically noise-smoothed gas absorption data can be obtained, such that the sensitivity of detecting gas absorption data on the basis of an optical multi-pass cell system can be improved.

The invention discloses an intelligent monitoring method for slope deformation, particularly relates to the technical field of optical vision measurement, and is used for solving the problem that a deformation signal and optical noise are difficult to effectively separate due to the influence of atmospheric disturbance in an existing vision monitoring method. Collecting image data and point cloud data of the surface of the side slope through vision measurement equipment; analyzing high-order statistical characteristics of the data to identify abnormal components; analyzing cluster behaviors of abnormal components under different spatial scales to distinguish a random cluster from a structural cluster; marking according to cluster types or performing correlation analysis with atmospheric environment parameters; evaluating the comprehensive influence of the abnormal component on the deformation signal based on the analysis result; and finally, according to an evaluation result, adopting adaptive filtering to separate abnormal components and deformation signals, and outputting a monitoring result. Noise and real deformation signals caused by atmospheric disturbance can be effectively recognized and separated, and the accuracy and reliability of slope deformation monitoring are remarkably improved.

This invention proposes a dual-resonance coherent population trapping magnetometer and its implementation method, which can effectively suppress optical noise of lasers, improve sensitivity, and increase the lower limit of the measurement range. It includes: a first microwave source, a second microwave source, a first current source, a second current source, a first bias-T, a second bias-T, a first VCSEL laser, a second VCSEL laser, a first collimating lens, a second collimating lens, a first PBS, and a λ / 2 waveplate. 87 The system includes an Rb atom gas cell, a second PBS, a first photodiode, a second photodiode, a differential amplifier, and a dual-channel lock-in amplifier. The first VCSEL laser, the second VCSEL laser, the first collimating lens, the second collimating lens, the first PBS, and the λ / 2 waveplate are located at... 87 On the left side of the Rb atomic gas cell, the first VCSEL laser and the first collimating lens are located to the left of the first PBS, and the second VCSEL laser and the second collimating lens are located below the first PBS. The laser output from the second VCSEL laser is reflected by the first PBS and propagates towards the right atomic gas cell.

This application relates to the field of particle counters, and discloses a method, system, apparatus, and medium for calibrating the output signal of a particle counter. The method includes: acquiring the optical noise signal output by the particle counter to be calibrated, determining whether the optical noise signal meets preset conditions, and if not, transmitting the calibration signal to an optical power control circuit so that the optical power control circuit adjusts the input voltage of the laser in the particle counter to be calibrated, thereby calibrating the output signal of the particle counter. Therefore, the technical solution provided in this application, by acquiring the output signal of the particle counter and adjusting the input voltage of the laser based on the output signal to calibrate the particle counter's output signal, avoids the influence of factors such as temperature and the stability of the signal amplification circuit in the particle counter on the particle counter's output signal during the particle counter's processing of particle scattered light, such as reception, conversion, and amplification, thereby improving the particle monitoring accuracy of the particle counter.

The invention discloses a wavelength division isolation anti-interference method and system for a radio frequency optical network front return signal, and the method comprises the steps: introducing an interference monitoring system which represents the quality of a radio frequency signal and the power optical noise at the same time, and constructing a wavelength interference matrix of the normalized interference intensity between any wavelength channel pairs according to the interference monitoring system; carrying out topology analysis based on the matrix, calculating the interference degree and automatically dividing interference clusters of high-interference channels to realize global perception and quantitative description of a common-fiber link interference relationship; target wavelength configuration parameters of the central wavelength, the wavelength interval, the guard band width and the optical filter bandwidth of each channel are adaptively determined by using the interference matrix and the interference cluster result, and differential widening and frequency shift are performed on the channels in the interference cluster; and finally, by controlling the adjustable light source and the adjustable optical filter, the wavelength division configuration is dynamically reconstructed along with the interference environment. Therefore, in an ARoF + PoF common-fiber transmission scene, both the anti-interference capability of the radio frequency signal and the frequency spectrum utilization rate of the optical fiber can be considered.

The invention provides a method for improving the discrimination threshold of laser methane telemetering equipment, which comprises the following steps: in a dark environment, turning off a laser of the laser methane telemetering equipment, and measuring a first harmonic light intensity value I1c, a second harmonic light intensity value I2c and a fourth harmonic light intensity value I4c; selecting a central wavelength of a laser, and selecting a standard methane gas chamber with a remote measurement value of Wt; calculating a proportionality coefficient k21 considering the influence of the white noise, and calculating a telemetry measurement value W21 after the compensation of the electrical noise; calculating a proportionality coefficient k41 considering optical noise influence and an estimated value W41 of a telemetering value, and calculating a credibility criterion F '; selecting a confidence interval [b-1, b]; the standard methane gas chamber is slowly deflated, Wreal is calculated in real time, when the methane concentration is reduced to enable all the calculated Wreal to be zero, the methane concentration value Cmin at the moment is measured, and the identification threshold Wmin of the laser methane telemetering equipment is obtained through calculation. According to the method for improving the discrimination threshold of the laser methane telemetering equipment, electrical noise can be compensated, and part of optical noise can be filtered out.

The application discloses a photovoltaic glass defect detection method and system based on image recognition, and particularly relates to the technical field of visual detection, and is used for solving the problem of optical artifact interference defect recognition caused by film layer interference effect on the surface of coated glass; the optical artifact distribution map is generated by extracting interference characteristics from a reflection image, the interference area is positioned in the frequency domain space of a transmission image, a process response template is constructed in combination with a deposition pulse frequency, polarization coherence screening and time-varying deconvolution cooperative filtering are performed to eliminate artifacts; based on the energy proportion dynamic decision re-inspection or defect classification process implementation, the inherent optical noise of the material and the real physical defects are effectively separated, and the accuracy and reliability of the coated glass defect detection are significantly improved.

The invention provides an optical system for reducing optical noise, which is used in the field of laser gas analyzers, and comprises a doublet collimating lens, the doublet collimating lens is arranged on an emission light path of an infrared laser light source, the doublet collimating lens is used for shaping a laser beam emitted by the infrared laser light source, and the doublet collimating lens is used for outputting the shaped laser beam. And the obtained laser collimated light beam is a nearly flat-topped light beam with uniform energy, is freely propagated in the space and is received by a receiving end. According to the invention, a single-piece doublet lens is used as a core optical element, the free light laser beam of TO packaging is shaped to realize laser beam homogenization and collimation, the introduction of intensity noise caused by non-uniform light intensity distribution of the light beam after long-distance light beam transmission is reduced, and the optical interference noise frequency is increased in combination with the long-focal-length light path design, so that the optical interference efficiency is improved. The influence of optical interference noise is reduced through a filtering algorithm. And the structure is compact, the installation and adjustment are simple and convenient, the environmental adaptability is strong, and the application effect of the laser gas analyzer in the gas detection field is realized.

This invention belongs to the field of electronic circuit technology, specifically relating to a true random number generation device based on a carbon-based chip, comprising: a broadband optical noise entropy source and an entropy collector. The broadband noise entropy source is used to generate a broadband chaotic noise signal. The entropy collector includes: a sample-and-hold circuit; a TIQ comparator for converting the sampling result into a digital signal output; a one-hot code generator for converting the digital signal output by the TIQ comparator into a one-hot code; and an encoder for converting the one-hot code into a binary code. In this invention, all parts of the entropy collector are designed using CNTFET technology, reducing power consumption.

The invention discloses a three-dimensional area light source light path magnetic control on-off device which comprises a first electromagnet (1), a second electromagnet (2), a third electromagnet (3), a first area light source (4), a second area light source (5), a third area light source (6), a magnetic fluid box (7), a first light intensity decision device (8), a second light intensity decision device (9) and a third light intensity decision device (10). As the light intensity transmissivity of the light beam transmitted into the magnetic fluid along the direction of the magnetic field is increased along with the increase of the external magnetic field within a certain range, when the light intensity transmissivity reaches a certain value, the light path of the light beam is determined to be on, otherwise, the light path is determined to be off, the magnetic field intensity generated by the three electromagnets is respectively adjusted, and the on-off of the three light paths can be realized; the optical on-off device has high environmental adaptability and optical noise interference resistance, and has good application potential in the technical field of optical communication and optical sensing.

The disclosure relates to an optical ranging sensor configured to determine proximity of a target object and an electronic system. The optical ranging sensor includes: a housing cover including a transmitting opening and a receiving opening; a light radiation source positioned to direct ranging light radiation through the emission opening toward the target object; an optical radiation receiver positioned to receive the ranging optical radiation reflected from the target object through the receiving opening; and a retroreflective mechanism implemented on a surface of the housing cover, where the retroreflective mechanism directs undesired optical noise back toward the undesired optical noise source and away from the optical radiation receiver; wherein the proximity of the target object is determined based on one or more attributes of the ranging light radiation.

The invention discloses an optical noise suppression difference method for an atom magnetometer, which belongs to the technical field of magnetic field measurement and weak signal detection, and comprises the following steps of: after acquiring double-optical-path optical signals of a main path and a reference path and converting the double-optical-path optical signals into voltage signals, separating alternating-current and direct-current components of the two paths of signals; the method comprises the following steps: respectively modulating and demodulating alternating current components of a main path and a reference path to obtain a main path demodulation signal containing magnetic field information and optical noise and a reference path demodulation signal only containing the optical noise, then calculating a dynamic gain coefficient based on two paths of direct current components, offsetting the optical noise through weighted difference operation, and outputting an effective magnetic field signal. According to the optical noise suppression difference method for the atom magnetometer, variable light intensity noise is effectively stripped, clinical landing enabling is carried out on the wearable SERF magnetometer, complex optical elements are not needed, interference resistance and adaptation integration are achieved, and the real-time measurement requirement of biological magnetic signals is met.

The application discloses a kind of all-fiber current sensor noise suppression method, light emitted by light source successively passes through coupler, polarizer, phase modulator, polarization maintaining optical fiber, 1 / 4 wave plate, sensing optical fiber and mirror, and the light reflected by mirror successively passes through sensing optical fiber, 1 / 4 wave plate, polarization maintaining optical fiber, phase modulator, polarizer and coupler, and then enters balanced photodetector positive port M, and the other outlet of coupler is electrically connected with balanced photodetector negative port N through optical attenuator.By adjusting the optical power of input light passing through coupler directly to photodetector through optical attenuator, and replacing common photodetector with balanced photodetector, the purpose of suppressing optical noise and photodetector common-mode noise is achieved, and the signal-to-noise ratio of output signal is improved.

This invention discloses a dual-laser synergistic high-temperature, high-speed rotating object axial vibration measurement device, relating to the field of vibration detection technology. It includes a main plate and a radiation-resistant plate mounted on the main plate. A drive motor is installed on the main plate. Measuring the dynamic characteristics, such as axial vibration, of a high-speed rotating object at high temperatures is a challenging problem. This device uses a dual-laser measuring instrument for measurement, and also features non-contact functionality. Furthermore, the dual lasers can compensate for light path disturbances caused by hot airflow. Specifically, one laser acts as the main measurement optical path, while the other acts as a reference optical path, specifically monitoring common path optical noise caused by hot airflow. Through differential calculations by a subsequent signal processor, environmental noise is subtracted from the main signal, thereby extracting the pure vibration signal of the measured turntable.

The utility model relates to a housing cap for an optical ranging sensor and an electronic system. A housing cap for an optical ranging sensor and an electronic system for transmitting and receiving optical radiation are provided while minimizing optical noise, such as ambient light, received at a reference sensor of the optical ranging sensor. An example housing cap of an optical ranging sensor may include a barrier wall defining a transmit cavity and a receive cavity. The emission cavity includes an optical radiation source positioned to direct the ranging optical radiation through the emission opening toward the target object, a reference sensor positioned to receive a portion of the ranging optical radiation, and an attenuation wall positioned between the optical radiation source and the reference sensor, an attenuation gap through which the portion of the ranging optical radiation passes is defined. The receiving cavity includes an optical radiation receiver positioned to receive the ranging optical radiation reflected from the target object through the receiver opening.

A method of making a grating coupler includes etching a first grating region into a substrate layer, wherein the first grating region comprises a first plurality of gratings having a first height and a first pitch between adjacent gratings of the first plurality of gratings. The method further includes etching a second grating region into the substrate layer, wherein the second grating region comprises a second plurality of gratings having a second height, different from the first height, and a second pitch between adjacent grating of the second plurality of gratings. The method further includes forming a cladding layer on the first and second grating regions, wherein the cladding layer has a different refractive index from the substrate layer.

The invention relates to a disturbance compensation device applied to a quantum current sensor and the quantum current sensor with an optical noise suppression function. The disturbance compensation device comprises an environment sensor array and a noise separation processor, wherein the environment sensor array is used for detecting environment disturbance in an external environment; the noise separation processor is used for receiving and acquiring a transmission disturbance signal captured by an end face detector in the quantum current sensor based on laser output by the laser and an original disturbance signal output by the laser in the quantum current sensor; a fluorescence detector in the quantum current sensor can determine a compensated current signal based on a light intensity signal determined by laser transmitted by an end face detector and environment disturbance output by an environment sensor array, so that current compensation is realized. Compared with a traditional laser-fluorescence cross-correlation observation device, the disturbance compensation device gives consideration to environment disturbance, original disturbance of the laser and transmission disturbance of the laser, and more accurate current signals can be obtained.

This application discloses a wavelength division multiplexing (WDM) isolation anti-interference method and system for front-back signals in radio frequency (RF) optical networks. The method includes: introducing an interference monitoring system that simultaneously characterizes RF signal quality and power optical noise, and constructing a wavelength interference matrix based on this matrix to represent the normalized interference intensity between arbitrary wavelength channel pairs; performing topology analysis based on this matrix to calculate the interference degree and automatically classify high-interference channel interference clusters, achieving global perception and quantitative characterization of interference relationships in co-fiber links; using the interference matrix and interference cluster results, adaptively determining the target wavelength configuration parameters for the center wavelength, wavelength spacing, guard band width, and optical filter bandwidth of each channel, and implementing differentiated widening and frequency shifting of channels within the interference clusters; finally, by controlling tunable light sources and tunable optical filters, the WDM configuration is dynamically reconstructed according to the interference environment. Therefore, in ARoF+PoF co-fiber transmission scenarios, both RF signal anti-interference capability and fiber optic spectrum utilization can be balanced.

The invention discloses a multi-channel time-to-digital converter with an on-chip optical noise suppression function, and belongs to the technical field of photon time-of-flight distance measurement. The multi-channel TDC circuit and the histogram circuit form a closed-loop feedback structure, invalid signals caused by dark counting and ambient light noise can be effectively shielded in a chip, the false triggering probability is reduced, and the distance measuring precision and the circuit efficiency are remarkably improved. The multi-channel TDC circuit comprises a control circuit, a multi-channel VCO circuit, a counter, an encoder and a selection circuit, and extraction and feedback of effective photon data are achieved by combining peak detection, storage and calibration mechanisms of the histogram circuit. The structure supports a single-event response mode and a multi-event response mode, noise data is dynamically suppressed according to a histogram feedback threshold value, high-precision distance measurement is kept, meanwhile, overall power consumption is reduced, the frame rate is improved, and adaptability in a high-dynamic, multi-target and low-power-consumption application scene is enhanced. The method can be widely applied to the fields of intelligent wearing, automatic driving and Internet of Things.

The present invention relates to improved Raman spectroscopy flow cells and integrated systems for in situ analysis of fluid samples under enclosed conditions. Two novel flow cell designs are disclosed: a Z-design, featuring an angled optical path with a beam dump cavity lined with non-reflective, non-fluorescent material to reduce optical noise, and a T-design, featuring a horizontal flow channel with vertical optical access through a window, sealed using standard O-rings. Both designs isolate the Raman probe from direct fluid contact, minimize dead volume, and facilitate efficient beam management for enhanced signal-to-noise ratio. The invention also covers integrated systems comprising a Raman spectrometer, probe, and the improved flow cells, enabling real-time, high-accuracy fluid analysis in industrial and laboratory environments. These designs improve optical performance, manufacturability, and adaptability across a range of Raman spectroscopy applications.

The application discloses a microwave photonics system double optical path cancellation optical noise elimination method and device. The method comprises the following steps: receiving a pulse light source signal, and inputting the pulse light source signal into a pre-constructed double optical path; collecting an output signal of the double optical path, and constructing the collected output signal of the double optical path into virtual double-channel data; determining a down-conversion signal from the virtual double-channel data by using a Fast-ICA algorithm, so as to realize elimination of an optical noise signal. The above scheme realizes elimination of optical relative intensity noise in a microwave photonics system, has fast calculation speed, can recover the down-conversion signal to the maximum extent, and improves the sensitivity of the system; and the above method does not need strict consistency of amplitudes and phases of double optical path signals, and the phases of the double optical path signals can be different by an integral multiple of a heavy frequency period, so that the method is more easily realized in engineering.

The application discloses a visible light communication device and method thereof and an electronic device, and belongs to the electronic technical field.The visible light communication system comprises a signal generating device, a light emitting driving circuit, a light emitting element, a photoelectric sensing device, a sensing driving circuit and a signal receiving device; the light emitting driving circuit comprises a digital-to-analog converter and a first operational amplifier; the signal generating device, the digital-to-analog converter, the first operational amplifier and the light emitting element are sequentially electrically connected; the sensing driving circuit comprises a transimpedance amplifier, a high-pass filter, a second operational amplifier and an analog-to-digital converter; the signal receiving device comprises a sampling decision module and a signal processing module; the photoelectric sensing device, the transimpedance amplifier, the high-pass filter, the second operational amplifier, the analog-to-digital converter, the sampling decision module and the signal processing module are sequentially electrically connected. By adopting the application, the influence of optical noise can be reduced, and the signal-to-noise ratio of a signal is improved.

This application provides an optical communication method, system, communication device, and storage medium, relating to the field of communication technology, for ensuring the stability of optical power during optical signal transmission, thereby improving the transmission performance of the optical communication system. The method includes: acquiring the wavelength channels occupied by activated services and the total wavelength channels of the optical communication system; determining the remaining wavelength channels of the optical communication system based on the wavelength channels occupied by activated services and the total wavelength channels; filtering a preset optical noise signal to obtain a first optical wave and a second optical wave; the first optical wave and the second optical wave have different frequencies; merging the first optical wave and the second optical wave to obtain a merged optical wave, and filling the merged optical wave into each of the remaining wavelength channels.

The application discloses a low, slow and small moving target sample generation method based on a degradation model and relates to the technical field of image processing, and specifically comprises the following steps: preparing a data set; acquiring infrared target and background samples; constructing an image degradation model; constructing a target pseudo sample generation model; pseudo data set comparison detection experiment; and pseudo data set sample comparison experiment. The application generates high-quality training data by simulating various degradation phenomena (such as motion blur, optical noise, illumination change and the like) in a real environment, constructs a direction angle controllable generative adversarial network, gradually learns a low-dimensional manifold of a target under continuous direction angles, generates target images of specific direction angles, and is optimized through adversarial training of a loss function, so that high-quality fake low, slow and small moving target images are finally generated; different degradation modes are constructed for the target and the infrared background, the target motion characteristics and the background imaging mechanism are comprehensively considered, and training samples consistent with actual scenes are generated.

The application provides a single-cell protein high-resolution quantitative detection system and method based on a micro-droplet compression channel, and the system composition comprises: a micro-droplet lysis and generation module, which is used for realizing the falling of a single-cell dyeing antibody in a droplet; a micro-droplet quartz compression channel detection module, which is used for realizing the collection and detection of a single-cell protein fluorescence signal in a micro-droplet; a micro-droplet fluorescence signal collection and processing module, which is used for processing and analyzing the collected fluorescence signal; and a micro-droplet driving module, which is used for realizing the flow rate control of the micro-droplet in a micro-channel. The application reduces optical noise by using quartz instead of a common base material, reduces electrical noise by using a sine wave to control a laser source to modulate fluorescence, and has a significant two-order-of-magnitude improvement in detection resolution compared with existing methods; and the application realizes high reliability and accuracy of detection results by optimizing the composition of a cell lysis solution compared with existing methods.

The present application relates to the technical field of intelligent detection of transformer substations, and more particularly to a power distribution substation intelligent inspection method and system for urban power grids, comprising: collecting multi-source inspection feature data and performing space-time dimension alignment, obtaining a target area corresponding to the to-be-tested equipment in infrared thermal imaging data, and associating and identifying a three-phase equipment group to which the target area belongs; constructing a thermal load evolution offset index of each sampling time, which is used to quantify the matching degree between the cumulative Joule heat effect generated by the current in a specific time period and the actual temperature rise at the sampling time. The present application constructs a thermal balance window in the time dimension to eliminate thermal inertia errors, and combines three-phase balance degree and image texture features in the space dimension to filter optical noise, thereby accurately identifying real high-temperature thermal defects, greatly improving the inspection accuracy of intelligent robots, and releasing grassroots operation and maintenance human resources.

A multi-polarization-based magneto-optical noise suppression method for inertial measurements is proposed. This method combines pulsed and continuous polarization to design a multi-polarized optical field. By separating the pulsed polarization phase from the detection phase, polarization noise is reduced. The multi-polarized optical field design enhances the nuclear spin polarizability within the gas chamber, overcoming the mutual constraint between nuclear spin polarizability and calibration coefficient improvement under continuous polarization conditions. This improves the nuclear spin self-compensation capability, achieving active magneto-optical noise suppression in atomic spin inertial measurement devices. This invention is reasonable, simple to operate, and applicable to atomic spin inertial measurement systems. It enhances magneto-optical noise suppression capabilities and provides a foundation for the development of high-precision atomic spin inertial measurement devices.

The invention provides an unfolding and folding attitude measurement system and method for a space flexible film deployable structure, and the system comprises a coordinate calibration subsystem which is used for building a unified global coordinate system before testing; the digital surveying and mapping subsystem is used for carrying out multi-camera synchronous acquisition on optical targets arranged at preset key parts of the expandable structure; the coordinate intelligent identification unit is used for carrying out optical noisy point elimination, target point identification and part category division on the collected data, and the unit is realized through a three-dimensional point cloud segmentation network model; and the digital twin modeling unit is used for carrying out point mapping on the optical target and the three-dimensional digital model and reproducing the dynamic posture of the deployable structure in a digital space. According to the method, high-precision attitude measurement in the unfolding and folding process of the flexible film deployable structure can be realized under the conditions that a large number of optical noisy points exist and targets are sparsely distributed, and reliable technical support is provided for ground final assembly and test of a large flexible deployable structure of a spacecraft.

This invention belongs to the field of 3D reconstruction technology, specifically involving a dynamic vehicle reconstruction method and system based on 3D Gaussian splashing and triangular mesh. The provided dynamic vehicle reconstruction method, in addition to 3DGS and Mesh reconstruction methods, incorporates vehicle characteristics and designs algorithms such as scale restoration, vehicle surface patching based on the "side skirt locking" optimization mechanism, and vehicle componentization. This eliminates optical noise and reconstructs regular continuous surfaces, improving the reconstruction effect for dynamic vehicles and increasing the utilization rate of reconstructed assets. It can simultaneously obtain high-precision 3DGS and Mesh reconstruction results for dynamic vehicles.