75 results about "Intensity change" patented technology

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.

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 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 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.

The invention discloses a GIS defect detection method and system based on X-ray intensity self-adaptive regulation and control, and the method comprises the steps: starting a closed-loop self-adaptive regulation and control process through inputting equipment parameters and a safety threshold value; the process preferentially guarantees radiation safety, and intelligently switches to an enhanced excitation mode or an optimization adjustment mode according to the partial discharge signal intensity detected in real time so as to dynamically update the X-ray intensity, thereby effectively exciting latent defects or finding an optimal working point. And when the signal and the intensity change meet the convergence condition, the regulation and control are completed. And then automatically realizing judgment of defect types and positions based on the discharge signal excited by the optimal intensity. According to the method, the limitation of a traditional fixed dose method is overcome, the sensitivity of early defect detection is remarkably improved, and the optimal balance between radiation safety and detection efficiency is realized.

The present invention discloses a locker system and a locker management method, the locker system comprising: a locker comprising a door; the image sensor is located in the storage cabinet and used for sensing at least one first image in first time and at least one second image in second time after the first time, and the door is opened in the first time and closed in the second time; and the processing circuit is used for judging the object state of the object in the storage cabinet according to the first intensity change between the at least one first image and the at least one second image. Object detection interference caused by light source change or light leakage of the storage cabinet can be improved.

The invention relates to the technical field of fluorescence temperature measurement, and discloses a calibration system and a calibration method for a fluorescence temperature measurement demodulator, which are used for generating an optical signal for simulating a fluorescence signal in a manner that the intensity of the emitted optical signal changes according to a specified function so as to replace an optical signal returned by a sensor. Therefore, a photoelectric diode of the demodulator receives a photoelectric signal of which the intensity changes according to a function and converts the photoelectric signal into an electric signal, and after the demodulator analyzes the electric signal, the demodulator corrects a direct error between a restored parameter and a standard parameter sent by the calibration device and takes the direct error as a deviation correction value. Therefore, the channel error of the demodulator is corrected by using the standard optical signal so as to calibrate the demodulator.

Target Pointing Device The target pointing device (10) for a target (C) comprises: - a reference set including a reference laser with intensity variations of known period, - an additional set (12A) including an additional laser with intensity variations of known period, time-shifted from those of the reference laser, - a tracking set (14) comprising: • a camera (30) for acquiring images of the target (C) and the laser spots on the target (C), • a main processing unit (32) for: o identifying the spots of the reference and additional lasers based on known time signatures, o generating a servo command based on the images and the identification, and • an actuation unit (34) for modifying the orientation of the line of sight of the reference and additional sets (12A) based on the servo command. Figure for the abstract: 1

The invention discloses laser projection equipment, a control method thereof and a computer readable storage medium, and belongs to the technical field of photoelectricity. The laser projection equipment comprises a detection assembly, a control assembly and a laser projection assembly. The detection assembly is used for acquiring an infrared detection signal and sending the infrared detection signal to the control assembly; the control assembly is used for sending a first control signal to the laser projection assembly under the condition that the infrared detection signal meets the starting condition of the human eye protection function, the starting condition comprises that a signal parameter of the infrared detection signal is not smaller than a parameter threshold value, and the signal parameter comprises at least one of signal intensity, intensity change rate, signal energy and energy change rate; and the laser projection assembly is used for stopping projecting the display content under the condition that the first control signal is received. According to the scheme, the projection of the display content does not need to be stopped after waiting for the preset duration, but the projection of the display content is stopped immediately under the condition that the signal parameter meets the starting condition, so that the harm to human eyes can be reduced as much as possible.

The application discloses an exposure device and method based on a DPP light source, comprising a DPP light source, a zirconium film, a multilayer film mirror and a linear grating, wherein the DPP light source is used for generating EUV light; the zirconium film filters the EUV light generated by the DPP light source; the multilayer film mirror collects the EUV light output by the DPP light source, and reflects the EUV light to vertically enter the linear grating; the vertically-entered EUV light interferes through the linear grating, and reaches photoresist to be exposed, wherein the intensity distribution of the EUV light on the photoresist plane is triangular distribution, and the intensity changes linearly with the position. The application can form a small-feature pattern by controlling an exposure dose, and can obtain a periodic pattern with a feature size of less than 25 nanometers by controlling the exposure dose; and smaller exposure linewidth can be realized by optimizing photoresist material.

This invention provides a method of detecting an electromagnetic field, and a device for 5 performing said method, the method comprising the steps of: transmitting a probe signal at a probe frequency in a first probe signal path and a second probe signal path to an optical receiver, wherein the first probe signal path passes through a transmission medium and the probe frequency is set to excite electrons of the transmission medium from a ground state to a first excited state; transmitting a coupling signal at a coupling frequency in a first coupling signal path, wherein the first coupling signal path overlaps with the first probe signal path in the transmission medium in a first overlapping section, wherein the coupling frequency is set to excite electrons of the transmission medium to a predetermined excited state so as to induce an Electromagnetic Induced Transparency, EIT, effect in the transmission medium such that an incident electromagnetic field at the transmission medium causes a change in refractive index in the transmission medium at the first overlapping section such that there is a change in an optical path length difference between the first probe signal path and the second probe signal path; combining the first path of the probe signal, following its passage of the first overlapping section of the transmission medium, with the second path of the probe signal; and monitoring, at the optical receiver, the intensity of the combined first and second paths of the probe signal so as to detect the incident electromagnetic field at the first overlapping section of the transmission medium as a change in the intensity caused by the change in the optical path length difference between the first probe signal path and the second probe signal path.

Methods and devices including implantable micro-sensors used to detect tissue-dissolved inert gas and to detect microbubble formation to avoid Caisson disease are described. The disclosed methods and devices are based on measuring the refractive index changes in hydrophobic liquids after absorbing an inert gas such as nitrogen. The changes in the refractive index are based on implementing one of an interferometry, optical microcavity resonance shift, a photonic crystal resonance, a beam deflection, a resonance tuning or detuning, an amplitude change, or an intensity change method.

The application discloses an insulator aging detection method based on spectral image consistency constraint driving, which synchronously collects homologous spectrum and evolution image signals of laser-induced plasma, extracts spectral degradation features reflecting material degradation and image evolution features reflecting energy coupling states; the core lies in constructing a spectral image physical consistency criterion, identifying and de-weighting or eliminating non-aging interference signals caused by environmental disturbance and laser fluctuation by quantifying the physical correlation degree of spectral intensity change trend and image shape evolution trend; an aging response index is constructed based on the data through consistency constraint, and a stable evaluation of the aging state is realized through a multi-point detection and an adaptive closed-loop adjustment mechanism. The application effectively solves the interference of plasma random instability on the detection result, and improves the reliability and quantitative precision of the insulator aging online evaluation.

The present invention relates to a PGC-Atan demodulation method and system for directly calculating the phase modulation depth, and belongs to the field of sensor phase demodulation technology. The method is based on the correspondence between the phase change caused by laser modulation and the interference light intensity. By monitoring the intensity change of the interference signal under different laser modulation parameters, the phase modulation depth is directly calculated. The demodulation system adopts internal modulation to perform high-frequency modulation on the laser light source, and uses synchronous A / D acquisition to eliminate the influence of the associated amplitude modulation. The obtained interference signal is mixed with the carrier frequency-doubled sine, carrier frequency-doubled cosine, and carrier frequency-doubled cosine signals respectively, and a pair of orthogonal signals containing the phase of the signal to be measured are obtained through low-pass filtering and signal processing. The orthogonal signal is subjected to inverse tangent operation and high-pass filtering to achieve accurate demodulation of the signal to be measured. The present invention eliminates the associated amplitude modulation and directly calculates and compensates for the carrier modulation depth and phase difference, significantly improving the accuracy of demodulation.

An apparatus for inducing ripples in a brain of a subject includes a light source. The light source is adapted to generate light. The produced light has at least two light variations. The at least two light variations are selected from at least two of a spatial variation, a temporal variation, a wavelength spectral variation, an intensity variation, or a polarization variation. The at least two light variations are selected for inducing ripples in the brain. The produced light produces a visual stimulus in the brain at the frequency of a ripple.

A piece hanging structure of glasses comprises a glasses frame, a piece hanging piece, a clamping block piece and a hinge seat, the piece hanging piece is provided with a pair of hinge joints, the hinge joints are provided with first hinge holes, the peripheral surfaces of the hinge joints are equally provided with a plurality of clamping grooves around the first hinge holes, and the hinge seat is fixedly arranged on the upper eyebrow frame part of the glasses frame. The hinge seat is provided with a second hinge hole hinged to the first hinge hole, a first installation groove is formed in the position, corresponding to the clamping groove of the hinge head, of the middle section of the hinge seat, the clamping block piece is fixedly arranged in the first installation groove, and the clamping block piece is provided with a protruding part extending into the overturning path of the clamping groove. The automatic closing caused by movement is avoided, and meanwhile, a user can adjust the opening degrees of the hanging piece at different angles according to the intensity change of ambient light, so that the eyes are in comfortable brightness.

An apparatus for emitting an incident laser beam that is a linearly polarized laser beam at a predetermined intensity, includes: an intensity changing optical element (polarization beam splitter) disposed on the optical path of the incident laser beam, for changing the intensity of an outgoing laser beam by allowing a transmission of a component of the incident laser beam polarized in a predetermined variable transmission direction and to rotate around the optical axis of the incident laser beam within a range of at least 90° with respect to a predetermined reference angle; and a polarization direction changing optical element (concave lens) disposed upstream the optical path of the incident laser beam with respect to the intensity changing optical element, and for changing the polarization direction of the incident laser beam and to emit the incident laser beam, the change direction being variable.

A vibration detection apparatus is presented which can avoid occurrence of a point where detection sensitivity deteriorates in vibration detection of a scattered light intensity monitor according to optical frequency multiplexing. A multi-dimensional space having as many dimensions as the number of frequencies to be used, causes scattered light intensity change at each optical frequency to correspond to each axis, plots a scattered light signal as a vector on the space, performs linear approximation passing through an origin on the space having a plurality of plotted vector points as original data, and performs vibration detection using a direction vector of an approximate straight line obtained as a result of the approximation.

The invention provides a phased-array wireless piezoelectric sensor signal interaction system and method, and the method comprises the steps: determining piezoelectric signal generation state information of a phased-array wireless piezoelectric sensor based on the excitation beam projection state of an excitation source to an object, thereby collecting a piezoelectric signal queue generated by the wireless piezoelectric sensor; complete acquisition of piezoelectric signals generated by an object in a full range in a first excitation beam projection detection process is realized; normal and abnormal piezoelectric signals are identified based on intensity change characteristics and signal-to-noise characteristics of the piezoelectric signals, and the normal piezoelectric signals are transmitted to a server based on a working state of a wireless transmission channel of the wireless piezoelectric sensor, so that reliable and efficient transmission of the normal piezoelectric signals is ensured; on the basis of the source end of the abnormal piezoelectric signal, excitation beam local re-projection is performed on the object, the corresponding piezoelectric signal is updated, and the transmission state of the object to the server is adjusted, so that signal transmission load increase caused by repeated global detection on the object is avoided, and the signal interaction transmission efficiency and reliability of the piezoelectric sensor are improved.

The invention provides a method and system for measuring the rotating speed of a rotating object based on a multi-core optical fiber, and the method comprises the steps: generating a detection light field with a specific space structure, transmitting the detection light field through the multi-core optical fiber, and carrying out the phase modulation, thereby obtaining an emergent light field with a preset structure; irradiating a rotating object by using the light field, receiving a reflected signal and returning through the same path, and detecting the intensity change of the signal to obtain a time domain signal; frequency shift information is obtained through frequency domain analysis, and the angular velocity is calculated. According to the method, through combination of the spatial light modulator and the multi-core optical fiber, multi-degree-of-freedom flexible regulation and control of a light field are realized, and the limitation of insufficient regulation and control degree of freedom in the prior art is broken through; the requirement on optical axis alignment precision is reduced by utilizing the structured light field; the system miniaturization is realized by adopting the flexible multi-core optical fiber, and the application problem in a narrow space is solved; parallel transmission and anti-interference characteristics of the multi-core optical fiber are brought into full play, and the measurement stability and precision in a complex environment are remarkably improved in cooperation with digital phase conjugation and transmit-receive integrated design.

The invention relates to the technical field of ray physical detection, in particular to a dual-energy X-ray transmission high-precision substance density detection method and system.The method comprises the following steps that the emission intensity of a dual-energy X-ray source is measured, the energy ratio value and the fluctuation trend are recognized, deviation section adjusting power is screened, ray output is adjusted, and response time and a deviation value are recorded; and the synchronous offset range is extracted by comparing signal differences, the signal variation and the threshold are identified, the X-ray response density is reconstructed, and a density evaluation value is output. According to the method, the dual-energy X-ray emission intensity under the condition of no medium is collected, the path attenuation spectrum is constructed, the energy attenuation expression precision is improved, signal offset is judged in combination with energy ratio fluctuation and upper and lower limit difference, transmission channel signal dynamic regulation and control are achieved, synchronous control is enhanced, intensity change is recognized, an adjustment area is accurately positioned, and the local compensation precision is improved; and a multilayer structure density evaluation value is output, so that the density identification and quantitative judgment capability in a complex environment is remarkably enhanced.

The invention relates to a control device with adaptive transmission power. The control device may be configured to transmit messages using the adaptive transmission power. The control device may determine a transmission power for transmitting the message based on a command in the message. The control device may determine a transmission power based on a change in illumination intensity caused by the command. The transmission power may be greater when the illumination intensity change is above a threshold than when the light intensity change is below the threshold. The control device may determine whether the message is successfully received based on reception of an acknowledgement message. When the message is not received, the control device may increase the transmission power and retransmit the message including the command at the increased transmission power. The control device may store (e.g., learn) the increased transmission power for later use.

The invention relates to the technical field of insulators, in particular to a composite insulator fault detection method and device, and the method comprises the steps: collecting the environment temperature, the insulator temperature and the insulator sensor position electric field intensity as initial values; periodically collecting the environment temperature, the temperature of different measuring points of the insulator and the electric field intensity of the sensor position; calculating the temperature rise of the environment temperature, the sensor temperature and the temperature initial value of each measuring point; calculating an electric field intensity change value; calculating the difference value between the temperature rise of each measuring point of the sensor and the environment temperature rise as the hot-spot temperature rise; and analyzing the difference between the temperature rise of different hot spots on the same sensor and the temperature rise of the hot spots among different sensors and the electric field intensity change, and evaluating the state of the insulator. The method is ingenious in design, eliminates the influence of the error of the sensor on the detection result, and solves the problems that the fault characteristic signal is weak and the detection is difficult due to the aging defect of the composite insulator in the power transmission line.