132 results about "Laser intensity" patented technology

The invention discloses a LiDAR-IMU-camera tight coupling positioning and mapping method and device for a mobile platform, and belongs to the technical field of robot SLAM. Synchronously triggering the color camera, the laser radar and the IMU through hardware, and unifying timestamps; performing compensation and distortion removal on the laser point cloud motion by the IMU data; based on curvature, intensity and density self-adaptive downsampling, local plane fitting errors are used for distributing observation weights; the IMU pre-integration pose is used as an initial value, point-to-surface registration of the weighted point cloud and the local map is carried out, and a laser-IMU tight coupling odometer factor is obtained; the color image and the laser intensity graph are fused into a multi-mode loopback descriptor, and loopback factors are generated through global retrieval and geometric verification; and inputting an odometer, an IMU, a laser loopback factor and a visual loopback factor into an increment factor graph optimizer, jointly solving a global optimal key frame pose, and outputting a dense laser point cloud map and a color visual point cloud map. The method can be operated in real time on an embedded platform, effectively inhibits drifting, and realizes centimeter-level global consistent positioning and mapping.

The invention discloses an all-optical three-dimensional scanning confocal fluorescent microscopic imaging device and an implementation method thereof. According to the invention, through a deep learning driven adaptive regulation and control method, CNN is adopted to process spatial distribution data and dynamically regulate and control a phase hologram and the light intensity and phase compensation of a laser, so that the focal point of exciting light is subjected to aberration-free axial displacement, a bidirectional parallel optical scanning track of a two-dimensional scanning system is optimized, and all-optical three-dimensional scanning is realized; lSTM and TCN are combined to obtain a time sequence dependency relationship, a laser light source, an adjustable diaphragm, an electric focus-adjustable lens and a photoelectric detector are integrally controlled, efficient synchronization and automatic operation and high-speed axial focusing adjustment are realized, errors and time sequence mismatch are eliminated, optical characteristics of different samples and environmental interference are automatically adapted, and high-quality imaging is kept. The robustness and the applicable scene range of the system are improved; the method is used for model biological embryo real-time tracking, intracellular signal molecule dynamic visualization, cell membrane protein migration and aggregation observation and intracellular organelle interaction tracking.

The invention discloses an underwater navigation positioning method and system based on supercontinuum laser intensity correlation. The system comprises a master control system, a transmitting end underwater base station and a receiving end underwater carrier. The method comprises the following steps: firstly, a main control system generates a super-continuum laser signal with pseudo-random code information, the super-continuum laser signal is separated into optical signals of different wavelength channels through a light splitting module, and the optical signals are respectively sent to underwater base stations uniquely corresponding to the wavelength channels and are emitted; then the underwater carrier receives optical signals from a plurality of base stations, identifies a signal source base station according to wavelength identification, performs correlation operation with a locally copied pseudo-random code sequence, determines signal arrival time TOA and calculates a pseudo-range; and finally, resolving the three-dimensional coordinate and local clock error result of the underwater carrier by combining the pseudo-ranges, absolute positions and transmission delays of the underwater carrier and the at least four base stations. According to the invention, high-precision and high-robustness absolute positioning of the underwater environment is realized, and the reliability of long-time positioning and navigation of the underwater robot is enhanced.

The invention relates to a laser processing system (1) having at least one laser source (3, 4) for generating a plurality of mutually independent laser intensity distributions (5, 6). The laser processing system (1) comprises a control device (7) for controlling the laser power levels (P1, P2, 13, 14) and / or the beam quality levels (K1, K2, 14, 16) of the laser intensity distributions (5, 6) independently of one another. The laser processing system (1) is designed to vary the laser power levels (P1, P2, 13, 15) and / or the beam quality levels (K1, K2, 14, 16) of the laser intensity distributions (5, 6) differently from one another within each laser pulse by means of the control device (7). The invention also relates to a corresponding method for processing material (2) by means of corresponding laser radiation (5, 6).

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 utility model belongs to the technical field of optical instruments, and particularly relates to an optical tweezer optical path module and a cell optimization system. The optical tweezer optical path module comprises a supporting base, a laser head mounting seat and a multi-stage attenuation module. The laser head mounting seat is arranged on the supporting base and is used for mounting a laser emitting head for emitting laser; and the multi-stage attenuation module is arranged on the supporting base and comprises a plurality of reflection attenuation mirror groups which are arranged on the light path at intervals, and each reflection attenuation mirror group is used for attenuating the laser intensity and changing the laser direction. The optical tweezer optical path module provided by the utility model has a multi-attenuation mechanism, and a relatively large attenuation multiple range is easier to realize, so that laser power adjustment in a relatively large range is realized, the laser power dynamic adjustment capability is favorably improved, the laser intensity is finely controlled, and cells are not damaged when various cells are fixed through an optical trap formed by laser.

The invention discloses a method for calculating and eliminating laser intensity modulation and carrier phase delay in a modulation absorption frequency stabilization system, and belongs to the technical field of semiconductor laser frequency stabilization and precision detection. In order to improve the stability and accuracy of the output center frequency of the laser, a modulation absorption frequency stabilization system is built; executing a coarse adjustment stage of laser intensity modulation and carrier phase delay parameters, and obtaining a phase difference between light frequency modulation and light intensity modulation; a fine stepping optimization stage is executed, laser intensity modulation and carrier phase delay parameter calculation are completed, and the updated phase corresponding to the maximum peak-to-peak value of the light intensity absorption 1f signal and the phase corresponding to the maximum value of the extreme value difference of the light intensity absorption 2f signal are obtained; performing elimination processing to obtain a light intensity absorption 1f signal after elimination processing; and for the modulation absorption frequency stabilization system, residual light intensity fluctuation caused by current modulation on the tunable semiconductor DFB laser is eliminated by using a light intensity stabilization device. The stability and the accuracy of the output center frequency of the laser are improved.

The present application relates to the technical field of sensor data calibration, and specifically relates to a multi-sensor data calibration processing method, system and medium, the method comprising: obtaining at least two sensor data and standard second harmonic signal data; obtaining the second harmonic signal data corresponding to the laser intensity signal from the sensor data; determining the harmonic abnormal feature, the first difference rate and the second difference rate according to the second harmonic signal data and the standard second harmonic signal data; determining the calibration error parameter according to the harmonic abnormal feature, the first difference rate and the second difference rate; based on the calibration error parameter, the initial detected target gas concentration is calibrated to obtain the calibrated target gas concentration. The present application can correct the initial detected target gas concentration according to the calibration error parameter, improve the calibration accuracy, and further reduce the deviation between the sensor detected gas concentration and the real gas concentration.

The utility model discloses a cutting and developing device for steel pipe processing, include: the base plate, the outer wall fixedly connected with the guiding device and the flattening device of base plate top, the inner wall sliding connection has cutting device of guiding device, the utility model relates to steel pipe cutting and developing technical field, this guiding device and flattening device, through fixed plate, threaded rod and the resistance board form "screw thread adjustment and clamping fixed " structure, and the operator can accurately control the resistance board spacing through rotating threaded rod, firmly fixed in the mounting hole with flame cutting nozzle, ensure that the flame nozzle always aligns the bus direction of steel pipe, simultaneously, the MSE-V-ONE laser doppler velocimetry sensor real -time monitoring steel pipe moving speed and position, not only can judge whether the steel pipe reaches the cutting area through the reflected laser intensity, but also can feed back the speed signal to the PLC controller, and dynamically match the gas supply amount of flame cutting nozzle and the conveying speed of steel pipe.

The invention relates to the technical field of power grid operation, and provides a power grid operation safety distance accurate sensing device and method in a non-fixed scene, and the device comprises a hardware device and terminal software which is in communication connection with the hardware device. The hardware device is integrated and deployed on a movable support or a holder, and comprises a laser radar sensor which is used for rapidly scanning a power grid operation scene and obtaining three-dimensional point cloud data including three-dimensional coordinates, laser intensity and echo information; the high-definition visible light camera is approximately parallel to the optical axis of the laser radar sensor and is used for collecting real-time video images of the operation scene; an AI visual analysis module and a point cloud processing unit are arranged in the embedded processor; and the terminal software is deployed on the edge computing equipment or the background server and is used for receiving and processing the data from the hardware device. According to the invention, the safe distance can be accurately sensed.

A method for manufacturing a vehicle crash pad includes heating a skin layer using a heater, attaching a cushion layer to the skin layer, placing a lower mold and an upper mold relative to a fabric including the skin layer and the cushion layer, forming a molded member on the lower mold, vacuum molding. The upper mold is lowered to perform the vacuum molding. The method further includes a laser processing of the fabric and molded member using a processing system, where a sensor senses the fabric and molded member, and based on sensed data, a through-hole is defined by adjusting the intensity of a laser's light irradiated to the fabric and molded member.

A device includes a grouping of N qubits, where N is equal to two or more, and a coherent light source configured to, given selected values for a set of parameters of at least a first and a second laser pulse, the parameters selected from a relative phase shift, a laser frequency, a laser intensity, and a pulse duration: apply at least the first and second laser pulses to all qubits within the grouping of N qubits, thereby coupling a non-interacting quantum state |1 to an interacting excited state |r, such that each qubit that begins in quantum state |1 returns to the state |1 upon completion of the at least first and second laser pulses, and such that qubits in the grouping are mutually blockaded.

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.

The invention discloses an NV color center excitation laser adjusting method, a medium, a control device and measurement equipment, and relates to the technical field of quantum measurement. The method is used for the NV color center excitation laser debugging system. The system comprises a laser used for emitting target laser, at least two adjusting lenses used for expanding the target laser, and a focusing lens used for focusing the expanded target laser to generate laser spots. The method comprises the following steps: adjusting an adjusting lens according to a laser spot, so that the laser spot is matched with a laser incident surface of a target diamond; the adjusting lens is adjusted according to the fluorescence brightness generated when the NV color center in the target diamond is excited by the laser spot, so that the area of the laser spot is reduced, the position of the laser spot on the laser incident plane is adjusted, and the fluorescence brightness meets the target excitation requirement. Therefore, the NV color center position can be quickly positioned, the concentration ratio of the laser is enhanced, the laser intensity and the effective utilization rate are improved, and the accuracy and the sensitivity of measuring equipment are improved.

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.

To provide an optical integrated laser element capable of reducing the occurrence of a mode hop while increasing the intensity of an output laser beam.SOLUTION: The optical integrated laser element includes a distributed feedback laser part, a semiconductor optical amplification part, and a high reflection film. The distributed feedback laser portion includes a diffraction grating and a first optical waveguide. The first optical waveguide is provided along the diffraction grating and has a gain. The semiconductor optical amplifier unit is provided on the substrate, is provided on a first side of the distributed-feedback laser unit, is optically connected to the first optical waveguide, has a gain, and includes a second optical waveguide having a width wider than a width of the first optical waveguide. The high reflection film is provided on an end surface on a second side opposite to the first side of the distributed feedback laser portion. The distributed feedback laser portion and the semiconductor optical amplification portion are integrated on the substrate. The length of the first optical waveguide in the optical waveguide direction is 1000 μm or less, and the length of the second optical waveguide in the optical waveguide direction is 1.5 times or more and 7 times or less the length of the first optical waveguide in the optical waveguide direction.SELECTED DRAWING: Figure 1

The application discloses a kind of based on vacuum environment laser intensity detection device and detection method, including cavity, photoelectric sensor and detector;The periphery of cavity is provided with at least two through holes and one air extraction hole;Wherein, two through holes form channel for laser transmission between them, and two through holes can be communicated with external device by pipeline;Air extraction hole is connected with external vacuumizing equipment;Photoelectric sensor is movably installed in cavity, and can be switched to the middle part of channel, to cut off the measurement state of optical path or switch to the idle state of channel optical path unblocked;Detector is electrically connected with photoelectric sensor.The application relates to the technical field of laser intensity detection, by the above setting, the intensity of laser formed under vacuum environment is detected by switching the position state of photoelectric sensor, without breaking vacuum or changing optical path, to realize the detection of light intensity without interfering with the original optical path in the device.

The present application relates to a kind of background guided schlieren temperature field reconstruction method and device combined with laser absorption spectrum, the method includes the following steps: step one, build the measuring device of background guided schlieren tomography, complete laser collimator alignment;Step two, kHz sawtooth wave signal is generated using function signal generator, the output wavelength range of tuning laser is scanned repeatedly the absorption spectral line of each gas component in flame;Step three, using multi-camera acquisition a group of schlieren image when temperature and density are uniformly distributed in the measurement region, and the schlieren image of the measurement region is synchronously collected when the temperature and density to be measured are non-uniformly distributed;Step four, move background pattern board through time-sharing mechanism;Step five, acquisition multi-wavelength laser scanning signal;Step six, according to laser intensity, Voigt line type fitting is carried out;Step seven, inversion operation is carried out, and the three-dimensional temperature field of measurement region is obtained.The method can obtain higher resolution three-dimensional temperature field distribution.

The invention discloses a laser radar full-waveform intensity correction method based on spatial-temporal feature decoupling, and the method comprises the following steps: (1) obtaining laser radar data, and synchronously carrying out the preprocessing of original full-waveform data; (2) constructing a waveform distortion model, and decomposing the full waveform data into a target component and a system noise component; (3) dividing the target component into a plurality of time sequences, and extracting time features and space features; (4) constructing a dynamic convolutional strength compensation network, and accurately predicting a distance compensation coefficient and a material compensation coefficient based on the spatial-temporal characteristics obtained in the step (3); and (5) enabling the compensation coefficient obtained in the step (4) to act on the laser intensity of the original target component to obtain corrected full-waveform intensity data. According to the method, the target reflection component and the system noise component are separated by establishing the waveform distortion model, and the distance compensation coefficient and the material compensation coefficient are accurately predicted by using the dynamic convolution intensity compensation network, so that high-precision correction of the laser radar full-waveform intensity is realized.

The invention discloses a lens laser etching machine, which relates to the technical field of camera lens processing, and comprises an acquisition module for acquiring laser etching information of a lens to be subjected to laser etching; the laser etching determining module is used for determining laser intensity information and marking speed information according to the laser etching information; the detection module is used for detecting the actual laser intensity information and the actual marking speed; the processing module is used for determining marking speed adjusting information according to the actual laser intensity, the target laser intensity, the actual marking speed and the target marking speed; the adjusting module is used for adjusting the laser intensity according to the laser intensity adjusting information; and the marking speed is adjusted according to the marking speed adjusting information. The laser intensity and the marking speed are measured in real time in the laser etching and marking process of the lens and are compared with the target mechanism intensity and the target marking speed, so that the real-time laser intensity and the marking speed are adjusted, the real-time laser intensity and the marking speed are within the target value range, and the marking precision is improved. And therefore, the laser etching marking effect is ensured.

The present application relates to the technical field of coating, and particularly provides a cladding auxiliary device and process for improving coating uniformity, which comprises a supercritical fluid generating unit, a coupling unit and a signal sensing and control unit; the supercritical fluid is transported to the coupling unit, mixed with coating powder transported to the inside of the coupling unit, and then sprayed to a molten pool on the surface of a substrate; the signal sensing and control unit at least comprises a high-speed camera, a high-frequency acoustic emission and vibration sensing mechanism and a control part; the high-speed camera is used for collecting molten pool liquid surface images; the high-frequency acoustic emission and vibration sensing mechanism is used for collecting characteristic high-frequency stress waves; and the control part is electrically connected with control structures for controlling the flow of supercritical fluid, the powder delivery amount and the laser intensity respectively. By mixing the supercritical fluid and the coating powder and then injecting them into the molten pool on the surface of the substrate, the present application significantly improves the coating thickness consistency, composition uniformity and surface finish.

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.

The present invention includes a high-intensity short-pulse laser generation system. The system includes a resonator and an optical path changing device coupled to the resonator. The resonator is configured to circulate or reciprocate at least a portion of laser light output from a light source along a predetermined first optical path, thereby increasing the intensity of the laser light propagating along the first optical path. The optical path changing device is coupled to the resonator and is configured to repeatedly change the propagation direction of the laser light propagating along the first optical path at predetermined timing, thereby propagating the laser light propagating along the first optical path onto a second optical path that is not on the first optical path, thereby generating high-intensity short-pulse laser light on the second optical path.

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.

The utility model discloses an adjustable laser cutting machine applied to an embroidery machine, and aims to provide an adjustable laser cutting machine which can utilize a single laser to continuously cut cloth at two cutting stations at the same time, so that the manufacturing cost is effectively reduced; according to the adjustable laser cutting machine applied to the embroidery machine, the laser intensity of the two cutting stations can be adjusted according to actual needs. The device comprises a laser, a spectroscope and a translation driving mechanism, the spectroscope comprises two reflecting mirror surfaces, and the two reflecting mirror surfaces intersect with each other; laser emitted by the laser device enters the intersection of the two reflecting mirror surfaces, one part of laser in a laser beam emitted by the laser device is reflected by one reflecting mirror surface, and the other part of laser is reflected by the other reflecting mirror surface, so that the laser beam emitted by the laser device is divided into two laser beams; and the translation driving mechanism drives the spectroscope to translate so as to adjust the area of laser spots emitted into the two reflecting mirror surfaces by the laser.

The application discloses a self-selected mode self-injection feedback single-frequency laser, which comprises a pump source, a coupling system, an input coupling mirror, a laser crystal, an output coupling mirror, a full reflection cavity mirror set, a reflective temperature body holographic Bragg grating and a semiconductor refrigeration device. The inner cavity ring oscillator and the outer cavity reflective temperature body holographic Bragg grating jointly constitute a composite cavity oscillator. The reflective temperature body holographic Bragg grating performs mode self-selection on incident laser with constant resonant diffraction efficiency, and then injects the ring oscillator with constant laser intensity, realizes the stable one-way operation of the composite cavity ring oscillator, and solves the problem of unstable structure of the composite cavity laser. The life of the oscillation photons in the cavity is greatly increased, and the output laser has the characteristics of high efficiency, low noise and narrow line width.

A laser intensity measuring device includes a diffraction optical element configured to split a laser beam into a plurality of branch beams; an integrating sphere including an entrance port through which one of the laser beam or the plurality of branch beams enters the integrating sphere, an exit port through which at least one of the plurality of branch beams exits the integrating sphere, and an inner wall on which the other of the plurality of branch beams impinge; and a sensor configured to measure an intensity of the other of the plurality of branch beams reflected by the inner wall.

The utility model provides a mirror surface target displacement sensor capable of inhibiting inclination influence. A left laser and a right laser which are symmetrically arranged are adopted and are incident to a mirror surface target surface at the same inclination angle; a left receiving light path and a right receiving light path which are symmetrically arranged and a linear array CMOS device are adopted to receive reflected laser signals, and an attenuation piece is adopted for each path of receiving to greatly weaken the laser intensity, so that photoelectric devices are protected from being damaged. When the mirror surface target moves back and forth, the distance between the imaging waveforms generated on the left CMOS device and the right CMOS device also changes and belongs to a linear positive correlation relation, and therefore the distance value of the two imaging waveforms can be used for representing the distance of the measured target. When a measuring head or a measured mirror target is inclined, imaging waveforms on the left CMOS device and the right CMOS device are shifted in the same direction, the offset amount is the same, and therefore the distance value between the imaging waveforms on the two CMOS devices does not change, and the influence of inclination can be completely overcome.

An optical pumping-based multimodal fusion detection apparatus is provided, relating to the field of brain-computer interfaces. The system includes a laser generation module, laser path control module, atomic vapor cell, photodetection module, ultrasonic detection module, and data processing module. The photodetection module, ultrasonic detection module, and data processing module function as a detection module. The detection module collects the laser intensity and polarization variation signals of the first laser after passing through the atomic vapor cell to output local magnetic field variations in the brain caused by neural discharges. It also collects ultrasonic signals corresponding to an interaction of the second pulsed laser with the measured part to output the subject's blood oxygen signal.