145 results about "Intensity change" patented technology

The invention discloses an overhead line system cable state real-time monitoring method and sensing system based on distributed optical fiber sensing. The Mach-Zehnder interference and phi-OTDR fusion type distributed optical fiber sensing system comprises a first light source, a second light source, a Mach-Zehnder interferometer, a phi-OTDR and a data acquisition and processing module. Raman amplifiers are arranged at the two ends of the Mach-Zehnder interferometer, so that the sensing distance is prolonged; the optical fiber sensing system extracts an interference optical signal and a backward Rayleigh scattering optical signal corresponding to a fault event after phase modulation when the fault event occurs; then processing the extracted backward Rayleigh scattering light signal to obtain intensity change information of a fault event, and demodulating the position of the fault event; and sending the two-dimensional optical signal into a pre-trained Swin Transform network model to extract a time domain feature, a frequency domain feature and a spatial domain feature, and identifying the type of a fault event through a classifier.

The invention provides a visual detection method based on fabric physical structure simulation. The visual detection method based on fabric physical structure simulation comprises the following steps: a, fabric physical modeling: establishing a physical structure model of a fabric, wherein the physical structure model is woven structure characteristics, warp and weft material characteristics and warp and weft arrangement modes; b, light source automatic calibration: detecting the angle and the intensity of a light source in real time by using a sensor; the irradiation angle and brightness of the light source are dynamically adjusted through the calibration model so as to eliminate the influence of the light source change on the detection. According to the visual detection method based on the fabric physical structure simulation, the influence of the light angle and intensity change on the detection precision in the prior art is innovatively solved. Through multi-angle light source control and an illumination compensation algorithm, the angle and the intensity of the light source are detected and calibrated in real time by using a sensor, so that the surface of the fabric can present consistent detection effects under different illumination conditions.

The invention belongs to the technical field of micro photoelectric mechanical systems and micro inertial devices, and particularly relates to a cascaded Fabry-Perot cavity-based ultra-wide optical bandwidth MOEMS gyroscope, which comprises a mass block, an optical structure, an anchoring structure, an electrostatic comb-shaped driving structure, a detection frame, an anchoring frame, an induction spring, a driving spring and a driving frame, the mass block is connected with the optical structure, anchoring structures are arranged at the four corners of the mass block respectively, electrostatic comb-shaped driving structures are arranged on the two sides of the mass block respectively, detection frames are connected to the two sides of the mass block respectively, and the mass block is connected with the anchoring frames through induction springs. On the basis of the Coriolis force measurement principle, the angular velocity is measured by detecting the wavelength or intensity change of an output harmonic peak caused by the structural change of the cascade cavity. Benefited from broadband tuning characteristics and high compactness of a cascade cavity structure, the device can be used in an optical bandwidth range exceeding 175 nm, and has a highly compact structure consisting of an all-silicon micro waveguide and a cavity.

The invention provides a spectrometer system comprising a spectrometer chip comprising a camera and a metasurface located on a detection surface of the camera; the metasurface comprises a plurality of nano-pore or nano-column arrays, and selective absorption of light with different wavelengths is realized through surface plasmons generated by different nano-pores or nano-columns; the camera detects the intensity change of light to be detected after the light passes through different nano-pores or nano-column arrays of the metasurface, and then spectral information is obtained through calculation. According to the spectrograph system, selective absorption of light with different wavelengths is achieved through the metasurface, and then spectral information is obtained through calculation, so that the structure of the spectrograph system is compact, and the overall size is very small; and the plasmon generated by the nanopore or nanopillar array has high tolerance to the structure size, so that the processing precision is lower, and large-area and large-batch preparation can be realized.

The invention discloses a method for measuring the focus heat effect and the heat damage of a Raman probe. The method comprises the following steps: S1, establishing a stable laser output system, and configuring a proper optical focusing system; s2, heating the standard sample to a target temperature according to a preset step length, keeping for several minutes at each target temperature, and performing spectral measurement on the standard sample by using a Raman spectrometer; s3, in the Raman spectrum measurement process, carrying out real-time temperature monitoring on the surface of the standard sample, and carrying out normalization processing on collected Raman spectrum data; s4, establishing a quantitative relation model between the relative intensity change characteristic # imgabs0 # of the Raman spectrum and the temperature T; and S5, predicting the temperature T of the standard sample under the current preset parameters according to the model, and adjusting the measurement parameters according to the prediction result, so that the predicted temperature T is lower than the temperature threshold value of the to-be-detected sample. According to the method, the thermal effect of the laser can be predicted before Raman measurement, proper measurement parameters are set in advance, and thermal damage to a measured sample is avoided.

Provided are a laser interferometer capable of reducing the frequency of a signal calculated and processed in a demodulation circuit and reducing the cost of the demodulation circuit, and a spectroscopic device provided with the laser interferometer. A laser interferometer is provided with: an optical modulator that adds a modulation signal to laser light using a resonator element; a light receiving element that detects a change in the intensity of the laser light including the sampled signal and the modulated signal, and outputs a laser reception signal; a signal oscillation unit that generates a reference signal of a first frequency with the vibration element as a source vibration; and a demodulation circuit that demodulates the sampled signal from the laser reception signal on the basis of the reference signal, the demodulation circuit comprising: a DC offset removal unit that removes the offset; a first phase regulator that regulates the phase of the reference signal; a first multiplier that multiplies the laser reception signal by a reference signal; a first filter; a second multiplier multiplying the first multiplication signal by a reference signal; a second filter; and a phase calculator that calculates a phase.

A sensor device for observing a scene comprises a plurality of pixels each configured to receive light from the scene and to perform photoelectric conversion to generate an electrical signal, event detection circuitry that is configured to detect as event data intensity changes above a predetermined threshold of infrared light received by each of a first subset of the pixels, pixel signal generating circuitry that is configured to generate pixel signals indicating intensity values of visible light received by each pixel of a second subset of the pixels, and a control unit that is configured to extract additional information from the event data detected within the received infrared light, which additional information differs from two-dimensional intensity information on the observed scene.

The invention discloses a visual tactile sensing system and method based on visual-magnetic fusion, and the method comprises the steps: isolating an external light source through a surface coating, reconstructing the surface texture of a sensed object, and obtaining the texture deformation information; the texture deformation information of the surface coating is received based on a camera, image information is obtained, force measurement is carried out through mark points arranged between the surface coating and the transparent silica gel, and standard force is obtained; magnetic field intensity change information caused when the postures of the marking points change is collected through a Hall sensor; based on the image information, the standard force and the magnetic field intensity change information, force measurement of the sensed object is achieved, and a force measurement result is obtained. The method provided by the invention can measure the high-precision multi-dimensional displacement of the mark point, has faster response or frequency, and realizes the functions of high-precision force measurement, high response and proximity sense of the visual tactile sensor.

The invention relates to a dual-wavelength vortex light interference displacement measurement system and a dual-wavelength vortex light interference displacement measurement method for compensating installation and adjustment errors through image recognition, and belongs to the technical field of optical precision measurement of precision measurement. Comprising a laser light source A, a beam expander A, a collimating mirror A, a vortex wave plate A, a laser light source B, a beam expander B, a collimating mirror B, a vortex wave plate B, a beam splitter prism A, a reflector A, a reflector B, a beam splitter prism B, a reflector C, a displacement table and a camera. An image recognition method is used for processing a dual-wavelength vortex light interferogram, displacement calculation is carried out according to the overall intensity change distribution of the interferogram, and different from traditional angle recognition extraction, the method is used for solving the problem that a measurement result is affected by system errors existing in a measurement system. The traditional angle identification precision is reduced due to interference pattern distortion, so that the measurement precision is influenced, the error influence is effectively reduced, the accuracy of the measurement result is ensured, and the micro-displacement measurement method is novel, effective, high in precision and large in range.

The present invention discloses a vibration suppression system and method for a star simulation system using laser interference detection. The system includes a laser light source, a first beam splitter, a collimator set, a second beam splitter, a mirror, a detection convergent mirror assembly, a CCD detector, a computer control system, a jitter compensating mirror and a flat splitter; the optical path of the whole system includes a reference optical path and a detection compensating signal optical path. The reference optical path and the detection compensating signal optical path converge at the same time on the CCD detector to constitute a vibration detection interference optical path, and the computer control system performs feedback compensation according to the interferogram intensity change formed by the vibration detection interference optical path. Both the CCD detector and the jitter compensating mirror are connected to the computer control system. The present invention improves the accuracy of spacecraft attitude tracking correction by adding a laser light source and a second beam splitter so that both star simulation imaging and optical path jitter compensation correction can be performed.

A sensor device comprises a plurality of pixels each configured to receive light and perform photoelectric conversion to generate an electrical signal, circuitry that is configured to generate event data by detecting as events intensity changes above a predetermined threshold of the light received by each of event detecting pixels that form a first subset of the pixels, generate for each of a series of frame periods pixel signals constituting a frame image that indicates intensity values of the light received by each of intensity detecting pixels that form a second subset of the pixels during respective exposure periods, and associate with each other event detecting pixels and intensity detecting pixels that have a corresponding field of view and to dynamically change the exposure periods of the intensity detecting pixels based on the events detected by the associated event detecting pixels.

The embodiment of the invention discloses a signal detection method, device and equipment and a computer readable storage medium. The method comprises the following steps: acquiring an observation map of a to-be-detected signal; extracting intensity change data, frequency change data and chromatographic change data of the to-be-detected signal from the observation map; intensity characteristic information is extracted from the intensity change data, frequency characteristic information is extracted from the frequency change data, and chromatographic characteristic information is extracted from the chromatographic change data; and detecting the signal type of the to-be-detected signal based on the intensity characteristic information, the frequency characteristic information and the chromatographic characteristic information to obtain a type detection result. Through the method, the accuracy of signal type detection can be improved.

The invention provides a magnetic field sensing system based on polarization interference. A polarizer and an electro-optical modulator modulate an incoherent optical signal into two beams of linearly polarized light with different polarization states; the delay polarization adjustment module performs phase delay processing on the corresponding wavelength linear polarized light and performs polarization adjustment on another wavelength linear polarized light, and then the polarized light is combined by a polarization beam combiner and transmitted to the magneto-optical crystal; under the action of an external magnetic field, the polarization state of the beam-combined light changes when the beam-combined light passes through the magneto-optical crystal; the polarization analyzer guides the combined light with the changed polarization state to the same polarization direction, so that the intensity of the combined light is changed; the photoelectric detector carries out square law detection on the combined light with the changed intensity to obtain six paths of electric signals; the processor generates four polarization interferences based on the six paths of electric signals, two vernier envelopes are obtained, and the size of the external magnetic field is determined according to the frequency width of split valleys appearing in the lower envelope after the two vernier envelopes are superposed. The device is high in sensitivity and adjustable in measurement range and sensitivity.

The invention provides a laboratory digital management method and system, electronic equipment and a storage medium, and relates to the technical field of laboratory automation and spectral analysis. The method comprises the following steps: acquiring a multi-wavelength spectral image sequence in an experimental reaction container in a non-contact manner, associating the multi-wavelength spectral image sequence with a final performance index, and performing differential enhancement to generate a spectral change feature map; performing differential amplification on the spectral electric signal to suppress noise and enhance an effective signal, dividing a region of interest according to a container structure, calculating average spectral intensity, and generating a spectral response curve; the method comprises the following steps: extracting first-order and second-order derivative curves, identifying an intensity change inflection point and a slope abrupt change interval, screening out a key optical change mode in combination with a final performance index, finally establishing a mapping relation between the key optical change mode and the performance index, and constructing a digital model for monitoring a reaction state and predicting final performance. The reaction process can be monitored and the experiment result can be predicted through the spectrum change characteristics, so that the intelligence and accuracy of laboratory management are improved.

The invention discloses a foreign object intrusion identification and positioning method based on an optical fiber Rayleigh scattering technology. The method comprises the following steps: laying a cable and a double-core optical fiber in parallel; pulse light is injected into the double-core optical fiber, the pulse light generates backward Rayleigh scattering in the double-core optical fiber and is received, and the backward Rayleigh scattering is converted into an electric signal; positioning and verifying a fault position according to the electric signal, calculating attenuation compensation after the fault position verification is passed, calculating a positioning deviation according to the attenuation compensation, and obtaining a positioning result according to the positioning deviation. The distributed sensing characteristic of the optical fiber Rayleigh scattering technology is utilized, and the phase / intensity change of a backscattered light signal is analyzed in real time, so that millisecond-level response and meter-level positioning of disturbance along the underground cable are realized. After the fault position is positioned, the fault position is verified, the positioning accuracy of the fault position is ensured, and after the fault position is verified and positioned, attenuation compensation is performed, and the positioning deviation is eliminated, so that the positioning precision is further improved.

The invention relates to a defect detection method of a VR lens, and belongs to the technical field of lens detection. The method comprises the following steps: acquiring a to-be-detected VR lens; fixing the VR lens to be detected in a target container; turning on the light source emitter, and obtaining the intensity of a light beam before the light beam enters the to-be-detected VR lens; acquiring the intensity of the light beam when the light beam passes through the defect through an imaging image detected by an imaging device; wherein the imaging image comprises two types of stripe images with alternate light colors; determining the defect according to the intensity change before and after the light beam enters the to-be-detected VR lens and the stripe spacing in the imaging image; and determining the depth of the defect according to the intensity of the light beam penetrating through the defect. Through the method, the depth of the defect of the VR lens can be accurately determined.

The invention relates to the technical field of indirect time of flight (iTOF) ranging, and discloses an iTOF ranging power consumption optimization method, which comprises the following steps of: dynamically adjusting signal sampling frequency according to the change of environment illumination intensity; comparing the real-time sampling frequency with a preset interval, and generating an adjusting signal if the real-time sampling frequency exceeds the range; dividing power supply partitions based on the adjustment signal, calculating a partition power supply influence value, comparing the partition power supply influence value with a threshold value, and generating a power supply adjustment related signal; obtaining a load fluctuation value and a cooperative efficiency value according to the power supply adjustment execution signal, and calculating a partition optimization coefficient; and obtaining dynamic power supply strategy parameters, and superposing the dynamic power supply strategy parameters with the current power supply partition configuration to generate an optimization scheme. According to the method, the sampling frequency and the power supply strategy are dynamically adjusted, multiple influence factors are comprehensively considered, power consumption optimization of the iTOF ranging system is achieved, the system performance and stability are improved, and the method is suitable for multiple iTOF ranging application scenes.

The invention provides a dry-mixed mortar crack risk early warning method and system. The method comprises the following steps: acquiring reflection spectrum differences of dry-mixed mortar aggregates in ultraviolet and visible light wave bands, and quantifying distribution uniformity difference characteristics of coarse and fine aggregates; dynamically adjusting the intensity of a near-infrared light source of the multi-band imaging device based on the characteristics, and constructing a mortar space thermodynamic diagram; identifying the position of a stress concentration area in the thermodynamic diagram, and constructing a stress mapping network taking aggregate particles as topological nodes and stress transfer strength among particles as topological edges; measuring the stress transfer strength change of the topological edge, and calculating the probability distribution value of the crack initiation position; and comparing the probability value with a preset risk threshold value, and generating an aggregate proportion adjustment instruction. According to the method, millisecond-level visual early warning of the aggregate stress transfer risk is realized, the crack initiation prediction accuracy is improved, and the service life of the structure is prolonged.

The invention discloses a camera exposure time control method under high-dynamic background light intensity change, and aims to solve the problem of camera overexposure caused by environment light intensity change in optical measurement. The method comprises the following steps: building a test system, and setting a camera frame rate; setting initial exposure time, and shooting an image of the measured object to obtain an optimal gray scale; adjusting parameters of the signal processing circuit; and starting the to-be-tested equipment, and obtaining the exposure time when the ambient light intensity rapidly changes. According to the invention, an open-loop control method is applied, the ambient light intensity is captured in real time through the photodiode, and the ambient light intensity is converted into the camera exposure time inversely proportional to the ambient light intensity through the signal processing circuit, so that rapid adjustment of the camera exposure time is realized. Compared with a fixed exposure time measuring method and a traditional method based on an image gray value, the method has the advantages of being high in response speed, small in calculation burden, real-time in feedback and the like, and is particularly suitable for an application scene where the light intensity changes rapidly in a high-temperature environment.

The aggregation state determination method according to the present invention is a method for irradiating a liquid containing particles with laser light and determining the aggregation state of the particles on the basis of the amplitude of change in the light reception intensity of scattered light obtained by scattering the laser light by the particles, and comprises: a correlation acquisition step for acquiring a correlation between the particles and the laser light; obtaining the correlation between the particle size of the particles and the change amplitude of the light receiving intensity; and a determination step for determining the aggregation state of the particles on the basis of the correlation.

The present invention relates to the technical field of indirect time-of-flight (iTOF) ranging technology and discloses a method for optimizing iTOF ranging power consumption. The method comprises dynamically adjusting the signal sampling frequency based on changes in ambient light intensity; comparing the real-time sampling frequency with a preset interval and generating an adjustment signal if the range is exceeded; dividing the power supply into zones based on the adjustment signal, calculating the zone power supply impact value and comparing it with a threshold value to generate a power supply adjustment-related signal; obtaining the load fluctuation value and the collaborative efficiency value based on the power supply adjustment execution signal, and calculating the zone optimization coefficient; and finally obtaining dynamic power supply strategy parameters, which are superimposed on the current power supply zone configuration to generate an optimization solution. By dynamically adjusting the sampling frequency and power supply strategy, the method comprehensively considers multiple influencing factors to optimize the power consumption of the iTOF ranging system, improve system performance and stability, and is suitable for a variety of iTOF ranging application scenarios.

The embodiment of the invention discloses a system and method for rapidly representing a grain boundary network by using a series of transmission electron microscope dark field images, and belongs to the field of polycrystalline material microstructure characterization, and the method comprises the following steps: collecting series of dark field images at different positions on a plurality of diffraction rings; correcting drifting of the series of dark field images; for any position in the dark field image, taking the intensity change of the series of dark field images at the same pixel as the feature of the pixel, and calculating the data similarity of the pixel and the features corresponding to a plurality of adjacent pixels; and synthesizing and visualizing the similarity between any pixel and a plurality of adjacent pixels to obtain the form of the crystal boundary network. The method for rapidly characterizing the grain boundary network by using the series of transmission electron microscope dark field images provided by the embodiment of the invention has the advantages of high spatial resolution, insensitivity to crystal defects, small irradiation damage and capability of rapidly and accurately obtaining the grain boundary network, and can support further enrichment of material characterization technologies and provide technical support for development of crystal materials.

The present invention proposes a device for measuring particle velocity under strong background interference using modulated laser light. The device comprises a laser light intensity modulation system for modulating the laser light into a laser with varying intensity according to a modulation frequency; a data acquisition and processing system for collecting the scattered light signal from the particles when the laser light of varying intensity irradiates the particles, performing a bandpass filter on the scattered light signal centered on the modulation frequency, and obtaining the particle velocity based on the bandpass filtered scattered light signal. The device proposed by the present invention is suitable for measuring particle velocity under strong background interference and can solve the problem of particle velocity measurement failure caused by strong background noise during the measurement process.

The invention discloses a preprocessing method and a receiver adapted to intensity changes of pseudo satellite pulse signals, and the method comprises the steps: converting a high-bit-width digital intermediate frequency signal outputted by a high-bit-width analog-to-digital conversion chip into a low-bit-width digital intermediate frequency signal adaptive to a capture circuit and a tracking circuit; through a preprocessing circuit, the amplitude of an input signal of a high-bit-width analog-to-digital conversion chip is controlled, and when no pseudo-satellite pulse signal is input, the output power of an amplifier is controlled, so that the amplitude bit of a high-bit-width digital intermediate frequency signal is low 3 bits, and the rest are sign bits; the control parameter is the same as that when no pseudo-satellite pulse signal is input; under the conditions of not changing the data bit width in the existing capture circuit and tracking circuit and not obviously increasing the logic resources of the circuit, the receiver can adapt to satellite navigation signals and pseudo satellite pulse signals with variable strength, and the application range of the navigation receiver is expanded.

The application discloses an SBS phase conjugation mirror capable of displaying a sound wave field in real time, and belongs to the technical field of nonlinear optics.The application comprises the following steps: pump light passes through a half-wave plate and a polarization beam splitter, passes through an optical isolator, changes a polarization state through a quarter-wave plate, is focused through a focusing lens, and then enters an SBS medium pool, stimulated Brillouin scattering occurs, a periodic density modulation is formed in the medium, and an equivalent acousto-optic grating structure is generated.Through introducing an independent probe light beam, the probe light enters the SBS medium pool at an incident angle satisfying the Bragg diffraction condition, and the probe light will be diffracted on the acousto-optic grating formed by the sound wave field.The intensity of the diffracted light changes with the intensity of the sound wave field, so that the real-time measurement of the sound wave field waveform and the life parameter in the SBS process can be realized by detecting the change of the diffracted light intensity with time.

The application provides a film layer detection method, provides a to-be-detected film layer, focuses test laser on a first target position in the to-be-detected film layer and continuously irradiates for a first preset time period, obtains first intensity information of second harmonic generated by the first target position, determines doping concentration information of the first target position according to an initial intensity value in the first intensity information, and determines a doping type of the first target position according to intensity change information in the first intensity information. In this way, the doping type and the doping concentration inside the to-be-detected film layer can be determined based on the intensity information of the second harmonic, the to-be-detected film layer can be monitored, the monitoring time and means are flexible, the to-be-detected film layer will not be physically damaged, and a complete device structure including an electrode is not required, so that rapid analysis and online monitoring of the to-be-detected film layer can be realized.

An X-ray imaging system and a method thereof are provided. In one or more embodiments, the imaging system includes an X-ray detector having neuromorphic X-ray pixels that can be combined with integrating pixels in a single hybrid detector package. The X-ray detector may generate two types of datasets (e.g., output data streams), one of integrating keyframes, the other an asynchronous event stream of intensity changes. In one or more embodiments, the method may include detecting X-rays from an imageable event using the X-ray detector, generating the two types of datasets based on the detected X-rays, and reconstructing one or more images of the imageable event based on the two types of generated datasets. By utilizing artificial intelligence / machine learning, these datasets may be combined to generate novel x-ray imaging modes that include deblurred high dynamic range real-time frame sequences or a high-speed, high dynamic range frame sequence for subsequent viewing.

In a technique that uses collimated light to measure the position and vibration of an object, the goal is to ensure that the spot position of the collimated light can be reliably captured by a camera. [Solution] The measurement target area 30 formed on the surface of the object 12 includes a first area 31 that scatters incident light and a second area Ra, Rb that reflects light in the exit direction corresponding to the incident direction. Collimated light is irradiated onto the measurement target area 30 of the object 12. As a first measurement, the first area 31 is photographed by a camera 16, and the spot position of the collimated light is measured from the captured image. As a second measurement, reflected light from the second area Ra, Rb is received by a light receiving unit 18, and the vibration of the object 12 is measured using the change in the light reception intensity of the light receiving unit 18.