25 results about "Laser intensity" patented technology

The application relates to a detection method and system for measuring residual oxygen concentration by laser, and relates to the field of gas concentration detection. The method comprises the following steps: selecting laser with oxygen absorption peak wavelength as detection laser, applying a periodically changed modulation signal to form a modulation laser and irradiate the headspace, demodulating a direct current component from the modulation laser passing through the headspace, calculating a deviation rate according to the direct current component and a reference direct current, judging whether the deviation rate is within a threshold value, feeding back and adjusting the laser wavelength if the deviation rate is not within the threshold value, and finally outputting a laser intensity attenuation curve of residual oxygen to obtain the residual oxygen concentration. The detection system comprises an optical subsystem, an electrical subsystem, a feedback control subsystem and a data processing subsystem. The application can accurately measure the residual oxygen concentration in the headspace, effectively detect and correct the laser wavelength drift, and improve the measurement precision and stability.

The application relates to a laser speckle image denoising method and device, which combines the complementary advantages of a laser intensity image and a laser phase image, extracts and fuses a contour feature map of a laser speckle image and a curvature feature map and a normal vector feature map of a laser phase image, provides a neural network with abundant geometric context, and further adds geometric feature constraints in the neural network to form a hierarchical system. The synergistic effect of the geometric constraints enables the denoising model to accurately maintain the edge contour, local surface morphology, surface orientation and overall topological structure of the image when removing speckle noise, significantly improves the geometric structure integrity of the denoised image, and effectively solves the problem that denoising and structure preservation are difficult to balance and diagnostic information is lost in the background technology. The application provides a more reliable and accurate solution for medical imaging application scenarios, and has significant technical progress and application value.

This invention discloses a system and method for detecting water dynamics information based on laser intensity modulation, comprising: a signal sensing and modulation transmission module, an optical signal receiving and conversion module, and a data acquisition and processing module connected in sequence; the signal sensing and modulation transmission module is used to sense water dynamic parameters and generate corresponding electrical signals, thereby modulating the output light intensity of the laser transmitter so that the intensity of the output laser carries water dynamics information; the optical signal receiving and conversion module is used to receive the modulated laser signal and restore it to an electrical signal; the data acquisition and processing module is used to acquire, process, and analyze the electrical signal to extract the water dynamics information. This invention, by adopting a simplified technical approach of laser intensity modulation and direct detection, replaces the traditional complex frequency modulation system, successfully solving the long-standing core problems in the field of water dynamics detection: high equipment cost, system complexity, and difficulty in widespread adoption.

This invention proposes a high-precision method for measuring airflow thrust by extracting the Doppler frequency shift difference from the scanning absorption spectrum. A tunable laser performs forward and reverse scanning of the absorption spectrum. The laser wavenumber scanning waveform is symmetrical about the lowest wavenumber point. The laser beam is split into two beams, which cross the longitudinal section of the airflow center. The target gas absorption spectrum curve is obtained by measuring the laser intensity curve. The sum of the central wavenumbers of the absorption spectrum in both forward and reverse scans along the airflow path is calculated, as is the sum of the central wavenumbers in both forward and reverse scans against the airflow path. The Doppler frequency shift difference is extracted from the difference between the two sums of central wavenumbers, thus measuring the airflow velocity. The static temperature of the airflow is obtained using colorimetric thermometry, and the static pressure of the airflow is obtained using a nonlinear fitting method. The thrust is calculated by combining the airflow velocity, static temperature, and static pressure. This invention achieves airflow velocity measurement resistant to temporal noise interference and has significant application prospects in the field of integrated space-ground thrust measurement for engines.

The present invention relates to an apparatus and a method for detecting swelling of a battery mounted on an electric vehicle. To this end, the apparatus for detecting swelling of a battery mounted on an electric vehicle according to an embodiment of the present invention may comprise: a display unit; a light emitting unit disposed on each of an upper portion and a lower portion of one side of a battery case; a light receiving unit disposed on each of an upper portion and a lower portion of the other side of the battery case; and a processor electrically connected to the display unit, the light emitting unit, and the light receiving unit, wherein the processor is configured to acquire intensity of an output laser beam emitted through the light emitting unit, identify intensity of an input laser beam received through the light receiving unit on the basis of the output laser beam, calculate a ratio of the identified intensity of the input laser beam to the acquired intensity of the output laser beam, compare the calculated ratio with a threshold range to determine whether the battery is normal or whether swelling of the battery has occurred, and output a warning through the display unit when it is determined that swelling has occurred in the battery.

This invention relates to the field of gravity measurement, aiming to provide a small-sized, high-precision gravimeter based on the principle of antimagnetic levitation. The gravimeter includes a low-frequency magnetic potential trap unit, a levitation oscillator unit, a displacement detection unit, and a cavity enclosure unit. The lens groups of the low-frequency magnetic potential trap unit, the levitation oscillator unit, and the displacement detection unit are all located in the cavity of the innermost insulated shell. This invention provides a measurement environment free from external influences for displacement detection of the levitation oscillator, counteracts adjustments to the vertical frequency in the antimagnetic levitation potential trap, and uses a photoelectric converter to measure voltage fluctuations caused by changes in laser intensity to reflect the motion of the object under test, achieving high-precision gravity measurement. The oscillator uses magnetic levitation and does not have mechanical contact with the environment, avoiding long-term irreversible deformation. It eliminates the need for bulky temperature control and magnetic shielding devices or other auxiliary equipment; therefore, the overall size of the gravimeter is small, easy to move, and inexpensive, facilitating widespread adoption.

This application discloses a laser processing system and a method for compensating for laser beam directionality deviation. The method includes: a laser; a beam splitting module for splitting the laser emitted by the laser into a first beam and a second beam, wherein the percentage of the intensity of the first beam relative to the total laser intensity is less than the percentage of the intensity of the second beam relative to the total laser intensity; a photoelectric detection module for receiving the first beam and generating a corresponding electrical signal; a shaping module for shaping the second beam, wherein the shaped second beam illuminates a working surface; a processing module, communicatively connected to the photoelectric detection module, for determining the deviation of the first beam based on the electrical signal output by the photoelectric detection module and generating a driving command based on the deviation; and a driving module, communicatively connected to the processing module, for adjusting the position of the shaping module according to the driving command sent by the processing module. This design enables online monitoring of laser beam deviation.

The application discloses an electromagnetic wave non-reciprocal transmission structure based on light-excited graphene and a transmission method thereof. The structure is composed of silicon rods with different widths placed on a silicon / silicon dioxide substrate, and large-area CVD graphene is transferred to the structure to form a graphene super surface structure. Due to the asymmetry of the structure and the excitation of the nonlinear Kerr effect, the transmission efficiency of electromagnetic waves is significantly related to the incident direction of signal light. By optimizing the structure parameters, the light-excited graphene super surface structure based on the light-excited graphene super surface structure shows a large positive and negative transmission ratio. The device structure is simple and compact, the required incident laser intensity is only 80kW / cm 2 , and is relatively easy to realize in experiments. By utilizing the optical adjustable function of graphene, the working frequency band of the non-reciprocal device can be effectively controlled, thereby flexibly realizing the optical isolation function.

This utility model relates to the field of detection device technology, and in particular to a building wall verticality detection device. It includes a base plate for overall stability, undulating platforms at all four corners of the base plate for overall balance and stability, a marking guide frame at the center of the base plate to increase laser intensity and adapt to the wall surface, and symmetrically arranged vertical calibration frames on the base plate for guided sliding to adapt to wall verticality detection. The undulating platforms dynamically adjust the airbag pressure via an air pump, and the support columns adapt to uneven ground, eliminating equipment swaying caused by wind or vibration. The triangular calibration block of the vertical calibration frame carries a laser ball, and combined with the scale adjustment of the support rod and the cylinder-driven sliding, it achieves multi-point synchronous scanning of the wall surface, accurately mapping the overall flatness of the wall. The first and second steering columns of the marking guide frame support 360° rotation scanning of the laser rangefinder. The magnetic base plate and detachable vertical calibration frame support rapid assembly, adapting to different building scenarios and improving the overall detection effect.

This provides a system and method for parallel execution of multi-qubit quantum gates. [Solution] The device includes a coherent light source configured such that, given a set of N qubits, where N is equal to 2 or greater; and selected values ​​for a set of parameters for at least first and second laser pulses, where the parameters are selected from relative phase shift, laser frequency, laser intensity and pulse duration, the first and second laser pulses are applied to all qubits in the set of N qubits, thereby coupling a non-interacting quantum state |1> to an interacting excited state |r>, and as a result, each qubit that starts in quantum state |1> returns to state |1> upon completion of at least the first and second laser pulses, and the qubits in the set are blocked from each other.

This invention provides a method and apparatus for measuring the intensity distribution of high-energy laser light, relating to the field of laser intensity measurement technology. The apparatus includes: a beam sampling element, a sampling material, a sampling material control platform, a damage spot monitoring system, and a data processing terminal. The beam sampling element is used to sample a single beam of fixed diameter from the high-energy laser to be measured, obtaining the incident laser. The sampling material control platform, connected to the sampling material, is used to adjust the incident angle of the incident laser onto the surface of the sampling material and to adjust the position of the incident laser acting on the surface of the sampling material. The damage spot monitoring system is used to monitor the radius of the laser damage spot on the surface of the sampling material. The data processing terminal determines the intensity distribution of the high-energy laser to be measured based on the prior data of the damage threshold of the sampling material and the radius of the laser damage spot. This invention achieves direct measurement of the intensity and intensity distribution of high-energy laser light without using a beam attenuation element, providing intuitive results and simple operation.

The application discloses a device and method for measuring the stability of particles captured by a lithium niobate-based photovoltaic tweezer, and is composed of a particle capturing system and a real-time particle position measuring system. The particle stability measurement first makes laser sweep across the particles on the pure lithium niobate chip. Due to the unique crystal characteristics of lithium niobate, the image recorded by the CCD camera below presents regular light and dark changes. The image is calculated to obtain the function relationship between the particle displacement information and the gray value change. Then the substrate is replaced with an iron-doped lithium niobate chip, the particles on the chip are captured by the particle capturing system, and the real-time particle position measuring system can calculate the real-time particle position information. The application can measure the stability of the particles captured by the lithium niobate-based photovoltaic tweezer under weak laser intensity, and also can measure the capturing stability of the particles under large light intensity by adding an attenuator, and has the characteristics of wide measurable light intensity range and real-time observation during the whole process.

The method for calculating and eliminating laser intensity modulation and carrier phase delay in a modulation absorption frequency stabilization system belongs to the technical fields of semiconductor laser frequency stabilization and precision detection. In order to improve the stability and accuracy of the output center frequency of the laser, the modulation absorption frequency stabilization system is built; the coarse adjustment stage of the laser intensity modulation and the carrier phase delay parameter is executed, and the phase difference between the optical frequency modulation and the optical intensity modulation is obtained; the fine step optimization stage is executed, the laser intensity modulation and the carrier phase delay parameter calculation are completed, the phase corresponding to the maximum peak-to-peak value of the updated optical intensity absorption 1f signal and the phase corresponding to the maximum value of the extreme difference of the optical intensity absorption 2f signal are obtained; the elimination processing is carried out to obtain the optical intensity absorption 1f signal after elimination processing; for the modulation absorption frequency stabilization system, the optical intensity stabilization device is used to eliminate the residual optical intensity fluctuation caused by the current modulation of the tunable semiconductor DFB laser. The stability and accuracy of the output center frequency of the laser are improved.

This invention discloses a three-dimensional scene positioning method and system that deeply couples laser intensity correlation and inertial navigation. Specifically, it involves: first, constructing a laser positioning system by setting up four base stations that emit light quantum pulses of different wavelengths, distinguishing the base stations by wavelength; then, obtaining prior position information through the strapdown inertial navigation system of the carrier; next, constructing a discrete candidate point array centered on the prior position; at each candidate position, calculating the sequence of light quantum pulses to be received based on its geometric positional relationship with the known base stations, and performing correlation calculations with the actual received sequence of the carrier, outputting the candidate position with the largest correlation value as the direct position estimation result; finally, inputting the direct position estimation and the positioning result of the strapdown inertial navigation system into a Kalman filter for combined filtering to obtain the optimal position estimate and compensate for sensor errors in the inertial measurement unit. This invention achieves high-precision positioning in three-dimensional scenes and enhances the reliability of long-term positioning and navigation.

A method for inspecting an ophthalmic lens for the presence of an unacceptable semi-opaque defect in a lens body thereof comprises the steps of: illuminating the lens body with laser light in an area bounded by an edge of the lens body; detecting the intensity of laser light scattered by the illuminated lens body in a predetermined detection direction which is different from a direction of reflection; comparing the detected intensity of the scattered laser light with a predetermined threshold intensity; determining a size of at least one coherent area in which the detected intensity of the scattered laser light is higher than the predetermined threshold intensity; determining whether the size of the at least one coherent area is larger than a predetermined threshold size, and rejecting the ophthalmic lens in case the size of the at least one coherent area is larger than the predetermined threshold size.

A laser system parameter measurement system and method, storage medium, and electronic device are disclosed. The method includes the following steps: S1, zero-point calibration of the detection system: when the incident light is an ideal flat-top light, the focal point of the beam focused by the lens array is located on the center line of the lens. The centroid coordinates of the focal point output by the detector corresponding to each sub-lens are recorded as (X0, Y0), and used as the reference centroid; S2, the laser system under test emits light, and the centroid coordinates of the focal spot output by the detector corresponding to each sub-lens are recorded as (X0, Y0). i ,Y i S3, which is the actual measured centroid; S4, obtain the wavefront average slope (Gx) within each sub-lens region. i ,Gy i S4: The wavefront reconstruction matrix is ​​determined by the number of sub-lenses and the order of the restored Zernike polynomial, and then the average slope of the wavefront (Gx) is used. i ,Gy i The wavefront can be reconstructed using the Zernike mode method. This invention solves the problem of atmospheric disturbance in the original laser intensity measurement method, and allows for direct measurement at the laser system exit, ensuring the accuracy of beam parameter measurement.

The invention relates to a drying device (10) for drying an electrode coating (12) on a carrier film (14), comprising a laser device (18) relative to which the coated carrier film (14) can be moved in a direction of movement (V) for drying and which is configured to direct a laser field (22) comprising at least one laser beam (20) onto the electrode coating (12), wherein, in order to uniformly adjust a predetermined evaporation rate for a solvent of the electrode coating (12) over an entire width (B) of the electrode coating (12), the laser device (18) is configured to provide the laser field (22) with a laser intensity varying in the width (B), and / or a masking device (26) is arranged between the laser device (18) and the electrode coating (12).which allows the laser field (22) to transmit at different strengths along the lateral direction (B), whereby the laser intensity of the at least one laser field (22) reaching the electrode coating (12) can be varied depending on the predetermined evaporation rate of the solvent in the lateral direction (B).

This invention provides a multiphysics-coupled molecular dynamics simulation method and system for femtosecond laser ablation, comprising: establishing an atomic model of a wide-bandgap semiconductor material and its corresponding electronic grid; inputting laser parameters and material parameters and initializing field variables; introducing a carrier concentration evolution equation and updating the laser intensity distribution within the material based on the Drude model; considering the bandgap energy consumption term of the valence band electron transition process under femtosecond laser irradiation, improving the laser heat source term in the electronic temperature equation, updating the electronic temperature, and then obtaining the atomic-scale behavioral evolution through energy exchange between the electronic system and the lattice system, and outputting the results. This invention introduces the nonlinear absorption of femtosecond laser ablation of wide-bandgap semiconductor materials into a dual-temperature model-molecular dynamics model coupling framework, realizing a unified coupled simulation of energy deposition, carrier evolution, transient optical response, and material removal behavior of wide-bandgap semiconductor materials under femtosecond laser irradiation.

Provided is a blood flow quantitative detection system based on diffusion speckle, comprising: a laser for emitting measurement laser; an optical fiber probe for integrating a multimode light source optical fiber and a plurality of detection optical fibers, the light source optical fiber being connected to the laser for vertically projecting the measurement laser to the surface of a to-be-detected object; the plurality of detection optical fibers being capable of forming different source-detection distances with the light source optical fiber for collecting diffusion speckle signals at different depths after the measurement laser is vertically projected to the to-be-detected object; a camera unit for receiving the diffusion speckle signals collected by the detection optical fibers at different exposure times; an analog signal output module for outputting analog signals to the laser to adjust the intensity of the measurement laser, preventing the camera unit from being saturated when the exposure time is changed; and a computer for controlling the analog signal output module to output the analog signals and controlling the exposure time of the camera unit, and processing the received diffusion speckle signals to obtain blood flow quantitative information.

The application discloses a kind of based on multi-channel diffraction grating ultrafast laser intensity modulation method and system, method includes: placing optical element according to optical path design, alignment optical axis, adjust the output direction of ultrafast laser and system main optical axis coincide, complete preliminary calibration.Laser is split by blazed grating, focused to each channel electro-optic modulator by microlens array;8 independent electric modulation signals are generated synchronously, and after loading, the intensity modulation of multi-channel sub-beam is completed, and then synthesized by confocal aspherical mirror to eliminate aberration.When the modulation contrast is less than 30dB, based on fast and slow deviation grading mechanism: high-frequency dynamic deviation is compensated by real-time voltage correction optical path, low-frequency slow change deviation is compensated by temperature control refractive index and fine adjustment grating angle to reduce crosstalk, until standard is reached.Finally, linkage control mechanism is established, and parameters are monitored and dynamically adjusted in real time.Modulation speed, precision and stability are improved.

The application discloses a kind of multi-beam laser spot welding machine calibration device and use method, it is related to laser welding equipment technical field.Multi-beam laser spot welding machine calibration device includes base, first positioning piece, second positioning piece, calibration piece;Base is used to be installed on the rotary table of electric welding machine;First positioning piece is installed on base, and calibration point position is equipped on first positioning piece;Second positioning piece is installed on base, and long strip-shaped positioning slot is opened in second positioning piece, and positioning slot is located between calibration point position and the muzzle of laser gun;Calibration piece is set in base;Multi-beam laser spot welding machine calibration device provided by the application, by utilizing calibration piece, the laser intensity of each laser gun is tested and adjusted, then the laser emission direction of each laser gun is adjusted, finally the laser of each laser gun is confirmed to be emitted in direction, it is convenient to realize the calibration of the welding strength, welding accuracy of each laser gun, ensure the processing quality of electric welding machine to light device.

This invention provides a micro-Raman detection system for in-situ monitoring of nucleation changes in a nucleation reactor, comprising: a nucleation reactor, a microfluidic channel, a vacuum sampler, a micro-Raman detection unit, and a signal control and acquisition device. By coupling and integrating laser technology with an optical microscope, the system achieves precise and rapid focusing of incident light using a microscope objective, simultaneously acquiring the microscopic morphology of the sample surface. Combined with three-dimensional displacement adjustment of the microscope stage, it allows for targeted detection and analysis of specific micro-regions of the sample, with the system's smallest spot size reaching the micrometer level. Simultaneously, using the microscope objective as a Raman detection module, a 180°... o The backscattering excitation-collection mode concentrates the average laser intensity at the focal point, effectively enhancing the Raman scattering signal at the target site and ensuring efficient acquisition and transmission of the Raman signal, thus forming a microscopic Raman detection unit. This invention enables in-situ monitoring of structural changes in nanoparticles during nucleation, such as changes in the metal-oxygen bond in the nucleus and interlayer anions.

The application discloses a laser light intensity correlation positioning method based on a receiver array and belongs to the technical field of laser positioning. The method comprises the following steps: an ultrashort supercontinuum wide spectrum laser is used as a light source, a wavelength division multiplexing component is used to divide the light source into four narrowband pulses with different central wavelengths, the four narrowband pulses are transmitted to four transmitting ends through equal-length optical fibers and are synchronously transmitted, a photoelectric receiver array with a known topological structure is arranged on a target to be measured, four signals are independently and in parallel collected by units, a TDOA differential sequence is constructed by extracting the arrival time stamps of the four light signals, a plurality of independent instantaneous spatial coordinate estimation values are solved in parallel by using a hyperboloid intersection equation set, finally, the coordinate points solved are subjected to outlier detection and spatial domain mean filtering based on spatial correlation, and random noise is suppressed by using the law of large numbers. Through the spatial superposition operation of the receiver array, the Gaussian random noise is effectively eliminated, and the precision and stability of the laser positioning are significantly improved.

The application provides a flying marking method and device for a pole piece, electronic equipment and medium, and relates to the field of battery pole piece production. The method comprises the following steps: obtaining attribute information and code marking information of a pole piece to be processed; for any identification information, adjusting a standard laser intensity based on a determined laser intensity coefficient of the identification information to determine a target laser intensity; determining a marking parameter by processing a moving speed, a pole piece position, identification information and an identification interval by using a preset parameter determination model; and controlling a marking device to mark the pole piece to be processed according to the target laser intensity, a time parameter and the position parameter to obtain an identification pole piece comprising a plurality of identifications. The method ensures the clarity of the identification, the accurate identification position and the flow speed of the pole piece.

The application discloses a device and method for uniformly peeling semiconductor material, which is characterized in that a high-speed camera is arranged behind a focusing system, a CCD camera is arranged in front of the focusing system, the high-speed camera is used to shoot the crack length L1 of the first position of the first machining path when the semiconductor material is induced to be modified by the laser, the incident laser intensity is adjusted according to the crack length L1, and the crack expansion length induced by the laser at the subsequent machining position is kept uniform; meanwhile, the CCD camera is used to shoot the crack expansion length L2 of the first position at the current shooting time when the laser moves to the second position of the second machining path along the set machining path, the incident laser intensity is adjusted according to the crack expansion length L2, and the crack length L3 induced by the laser at the position when the laser moves to the third position of the second machining path satisfies the relationship L2+L3=L, the uniformity of the laser modification is improved, and the machining precision of the laser modification and peeling is improved.