226 results about "Spectral component" patented technology

The invention provides a wind generating set fault monitoring method and system based on voiceprint recognition, and the method comprises the steps: collecting gear box voiceprint signal data in real time, recording signal fluctuation caused by gear surface wear, and obtaining an original signal data set containing a frequency spectrum high-frequency component enhancement feature; a time-frequency analysis method is adopted for the original signal data set, non-linear interference of vibration signals is recognized, multi-scale decomposition is carried out, initial wear frequency spectrum narrow-band characteristics and medium-term harmonic components are separated out, and a frequency spectrum component set is obtained; extracting characteristic parameters related to modulation depth abnormal fluctuation from the frequency spectrum component set, identifying a gear pair meshing frequency change rule, and determining a distribution mode of a tooth surface contact noise proportion; and if the feature matching result shows that the deviation between the spectrum high-frequency component diffusion distortion feature and the reference feature library exceeds a threshold value, adding the tooth surface fatigue crack noise feature into the feature library to obtain a target feature library.

An on-chip mid-infrared micro-ring resonant cavity microfluidic spectrometer is integrated on a substrate material and comprises a spot size converter, an optical coupler, a microfluidic module, a micro-ring resonant cavity, a miniature thin-film resistance heater, a sequential control power supply module, an optical filtering system and a photoelectric detector array. Selective filtering is performed on an input optical signal, and the flow and flow velocity of liquid or gas to be detected are controlled by using the microfluidic module, so that selective absorption of spectral components of the liquid or gas to be detected is realized. In addition, the invention also discloses a mid-infrared integrated optical chip micro-fluidic multiphase detection device comprising the spectrometer and a detection method thereof, the device also comprises a pumping and reference light source module and an on-chip mid-infrared frequency comb generation module, a broadband frequency comb is generated as a light source, a photoelectric detector array is used for collecting signals, and the detection precision is improved. The detection and inversion of the type and concentration of multi-component liquid or gas to be detected are realized, and the on-chip, real-time and micro detection of multi-component substances is realized.

The invention discloses a method, a system, equipment and a medium based on a multi-composite ultrasonic penetration technology, and the method comprises the steps: generating high-frequency fundamental ultrasonic waves through a piezoelectric transducer array, and adjusting the frequency range to match the acoustic impedance characteristic of target soil; first, second and third harmonics are generated through the induction of a nonlinear medium in the fundamental wave propagation process, the phases of the harmonics are adjusted to realize coherent superposition, and the fundamental wave and the first, second and third harmonics are guided into a composite waveguide device for focusing and delay compensation to form a high-energy composite wave beam; a pulse interval is adjusted by adopting an intermittent emission strategy so as to inhibit energy attenuation in the soil; reflected wave spectrum components are monitored through an embedded acoustic sensor array, and driving parameters are dynamically adjusted; and residual ultrasonic energy is captured and fed back to a driving circuit to form a closed-loop energy utilization system. By integrating multi-order harmonic resonance and a dynamic frequency tuning technology, efficient transmission and deep penetration of ultrasonic energy in a complex medium are realized.

The invention relates to the technical field of monitoring light supplement adjustment, and discloses a monitoring light supplement automatic adjustment system based on ambient light detection. An ambient light dynamic sensing module of the system captures visible light and infrared spectrum components of a monitoring area in real time through a multispectral sensor array, constructs a light intensity distribution model in combination with illumination intensity historical data, and outputs a theoretical illumination distribution diagram; the spectral feature analysis module compares the theoretical distribution map with the actually measured light field data in a multi-dimensional manner, performs spectral deviation detection and generates a spectral difference feature tensor; the light supplement demand mapping module inputs the tensor into a space illumination analysis network, and generates a light supplement coverage demand thermodynamic diagram and calibrates the boundary of a low-illumination area in combination with a field angle of monitoring equipment and position coordinates of a light supplement lamp; and the self-adaptive light supplement strategy execution module starts a multi-band mixed light supplement mode for a high-demand area according to the thermodynamic diagram, and performs phase cooperative control on adjacent light supplement lamp groups. The system realizes dynamic and accurate adjustment of light supplement, and can effectively adapt to complex ambient light changes.

The invention discloses a fan fault diagnosis method based on SSD-PCA and grid search and a related device, and belongs to the field of fan fault diagnosis, and the method comprises the following steps: collecting a fan vibration signal, and obtaining a plurality of singular spectrum components through singular spectrum decomposition; calculating a kurtosis value of each singular spectrum component, screening the singular spectrum component with the maximum kurtosis value, and performing feature extraction on the singular spectrum component with the maximum kurtosis value to construct a fault feature set; and performing dimension reduction processing on the fault feature set, and inputting the fault feature set into a pre-trained SVM model to obtain a fault diagnosis result. The method can solve the problem that the diagnosis precision is reduced due to the fact that fault features are difficult to extract when non-stable and non-linear signals are processed in the prior art.

The invention discloses a multi-mode feedback control method and system for a femtosecond laser stone crusher, and relates to the technical field of medical instruments. The method comprises the following steps: constructing spectral component analysis, collecting spectral signals, and executing target chemical component identification; ultrasonic position detection: acquiring an ultrasonic echo signal through a transducer, and calculating a spatial distance; performing vision-assisted positioning, acquiring image data through an endoscope, and generating space image information; according to the spectrum identification result, the distance parameter and the space image information, multi-source data synchronization processing is completed; generating a laser parameter control instruction according to the fusion result; and executing a real-time feedback regulation and control process, obtaining feedback information, and completing control parameter updating and closed-loop response. Through fusion of multi-modal information such as spectrum identification, ultrasonic distance measurement and visual navigation, real-time identification of stone types, intelligent matching of laser parameters and accurate control of spatial positioning are realized, and the accuracy, safety and intuition of lithotripsy operation are remarkably improved.

The invention discloses an automatic adjusting method and system for an energy-saving lamp, and relates to the technical field of illumination control, and the method comprises the following steps: S001, collecting an original illumination signal outputted by an illumination sensor in real time, carrying out the frequency domain analysis and time sequence change rate analysis of the collected original illumination signal, and obtaining a time sequence change rate; extracting a frequency domain distribution characteristic and a time change characteristic in the original illumination signal to identify an abnormal spectrum component contained in the original illumination signal; and S002, based on the identified abnormal spectral components, analyzing an energy intensity change trend of the original illumination signal in a target frequency band, extracting an energy mutation feature and a time sequence rapid fluctuation feature appearing in a corresponding frequency band, and constructing a multi-dimensional dynamic feature vector of the abnormal signal. According to the method, high-precision identification and dynamic suppression of abnormal signals of the illumination sensor are realized, and a self-repairing closed-loop feedback mechanism is constructed through feature vector comparison and error locking evaluation and intelligent adjustment of a threshold value and filter parameters, so that the anti-interference performance and the energy-saving control effect of the system are improved.

The invention provides a display control method and system for a liquid crystal display screen, and the method comprises the steps: carrying out the nonlinear spectrum mapping processing of an input RGB drive value, and obtaining a theoretical emission spectrum through combining with the response characteristics of liquid crystal molecules; calculating a reflection spectrum component in the multilayer structure according to the ambient light spectrum, and superposing the reflection spectrum component with the theoretical emission spectrum to obtain an actual observation spectrum; calculating a difference value between the actual observation spectrum and the target spectrum, and converting the difference value into an RGB correction value through a constraint optimization algorithm to obtain an RGB driving value after ambient light compensation; and calculating actual white point color coordinates, and adjusting the actual white point color coordinates to a standard white point position through a progressive white point migration algorithm. Display parameters can be dynamically adjusted according to real-time ambient light conditions, the influence of ambient light reflection on colors is effectively compensated, meanwhile, color temperature consistency and color accuracy are ensured through white point correction, the display quality under different ambient lights is remarkably improved, and the visual experience of a user is improved.

The invention provides a spectrograph based on a fast adjustable filter, the spectrograph comprises the fast adjustable filter, a photoelectric detector, a data acquisition card and a spectrum reconstruction module which are connected in sequence, the fast adjustable filter successively filters spectral components of different wavelengths in the working bandwidth of the spectrograph in sequence, and after each filtering, the spectral components of different wavelengths in the working bandwidth of the spectrograph are obtained. The photoelectric detector detects an optical signal with corresponding light intensity and converts the optical signal into an electric signal, and when the wavelength of the filtered spectral component is within the wavelength range of the to-be-detected light, the light intensity of the optical signal and the current of the electric signal are reduced; the data acquisition card performs current acquisition on each electric signal in sequence to obtain a to-be-measured current vector; the spectrum reconstruction module reconstructs the light spectrum to be measured according to the collected current vector to be measured and a pre-stored spectrum transmission matrix. The spectrograph is high in detection speed, small in size and simple in detection method.

Apparatus and methods are described for use with a bodily emission of a subject that is disposed within a toilet bowl. One or more light sensors are configured to receive light from the toilet bowl, while the bodily emission is disposed within the toilet bowl. A computer processor detects a set of three or more spectral components that have a characteristic relationship with each other in a light spectrum of a microorganism, by analyzing the received light, and determines that there is a presence of the microorganism within the bodily emission in response thereto. Other applications are also described.

An optical coherence tomography (OCT) system comprises an interferometer configured to split incident light into a reference beam and a test beam, and to interfere the test beam reflected from the specimen with the reference beam reflected from a reference mirror to produce an interference pattern. The OCT system also comprises a spectrometer configured to analyze spectral components of the interference pattern at non-uniformly sampled wavenumbers. A computer-readable memory of the OCT system is configured to store a measurement model with elements connecting different depth values with different non-uniformly sampled wavenumbers and weighted with weights derived from a power spectral density (PSD) of the incident light for corresponding wavenumbers. The OCT system further comprises a processor configured to determine the profilometry measurements of the specimen as a maximum likelihood estimate of the specimen surface depth by back-projection of the measured intensities with the measurement model.

The method for integrated imaging of surface diffuse reflectance and three-dimensional topography based on oblique stripe patterns belongs to the technical field of structured light three-dimensional imaging; this method generates cosine oblique stripe patterns with different frequencies, forms cosine oblique stripe images under a fixed light wave on a diffuse reflection plate and a sample respectively, then performs Fourier transform to obtain the image spectrum, and performs filtering and inverse Fourier transform to obtain the spatial domain expression forms of the DC component and the first-order spectrum component, thereby obtaining the surface diffuse reflectance and the wrapped phase corresponding to the image pixel points of the sample surface, unwrapping the wrapped phase to obtain the absolute phase and calculating the three-dimensional coordinates of the sample surface corresponding to the image pixel points, and finally realizing the integrated imaging of the surface diffuse reflectance and three-dimensional topography of the sample; compared with the traditional Fourier transform three-dimensional imaging method using positive stripe patterns, the present invention improves the measurement accuracy of the three-dimensional coordinates of the sample surface, realizes the measurement of the surface diffuse reflectance of the sample, and further realizes the integrated imaging of the diffuse reflectance and three-dimensional topography.

The invention provides an EMD (empirical mode decomposition) and correlation analysis-based double-probe vortex shedding flowmeter anti-interference method, which relates to the technical field of signal processing, and is characterized in that a vortex shedding sensor signal sequence containing periodic vibration interference is decomposed into multi-scale IMF components through self-adaptive characteristics of an EMD method, and spectrum components of a flow signal and vibration noise are accurately separated. According to the method, aiming at the non-stable and multi-band coupling characteristics of double-probe signals, the vibration noise interference under the complex vibration interference of an industrial field is effectively solved, and the environmental adaptability of noise suppression is remarkably improved. According to the method, on the basis that the advantages of self-adaptive decomposition are reserved, the IMF component series is dynamically controlled, that is, only the IMF components of the first four stages are taken, redundant calculation caused by over-decomposition is avoided, and the real-time performance of the system is guaranteed. An upper probe signal is introduced to serve as a reference channel, interference components are removed through a correlation analysis method, the complexity of a blind source separation algorithm is reduced, and meanwhile the method has higher detection precision and stability.

The invention relates to the field of agricultural lighting equipment, and discloses a plant light quality regulation and control integrated LED light source with a uniform spectral space and a method of the plant light quality regulation and control integrated LED light source. The multispectral LED chip group is arranged on the lamp bead substrate in a die bonding manner; the plurality of groups of independent bonding pads are arranged on the lamp bead substrate and are electrically isolated from one another; and the transparent optical lens adhesive layer covers the chip group. And different spectrum chip groups in the multi-spectrum LED chip group are electrically connected with the corresponding independent bonding pads respectively. Driving current is provided for the multiple groups of independent bonding pads through an external driving circuit, and the luminous intensity of different spectral components is independently adjusted by independently adjusting the magnitude of the current input to different bonding pad groups, so that the output composite spectrum is changed. According to the invention, the multispectral chip is integrated in a single packaging body, the problem of non-uniform spectral space is solved from the physical source, the accurate regulation and control of the spectral ratio are realized through multichannel independent control, and the design and manufacturing cost of the lamp is reduced at the same time.

Described is a system for modulating power to one or more radio frequency (RF) amplifiers to suppress undesired output signal components, improve linearity and reduce noise. The described systems and techniques enable shaping of spectral components introduced via an amplifier bias voltage owing to transitions among bias discrete states. The systems and techniques facilitate operation of multilevel, RF amplifiers under a wider range of operating conditions. In embodiments, the system includes modulators coupled to a supply terminal port of each of the one or more amplifiers to modulate the voltage levels supplied to the one or more amplifiers. The outputs of the modulators may be combined to provide a combined signal coupled to the amplifiers. A delay circuit delays switching of at least one of the power modulators relative to other modulator, by a variable time delay. This results in suppression of undesired output signal components of the amplifier output.

A calculation module for determining a localization, system, eyewear and computer implemented method. The calculation module is configured to receive, from a spectrophotometer of an optical device, data representing a power density of at least two spectral components of a light received by the spectrophotometer and to determine the localization using the power density of the at least two spectral components.

The invention discloses a Raman spectrum-based EVA polymerization reaction feed composition content determination method, and belongs to the field of polymer production and spectral component quantitative analysis. The method comprises the following steps: measuring the volume contents of ethylene, propylene and vinyl acetate in a feeding sample; measuring the Raman spectrum of the feeding sample, and analyzing and selecting the characteristic spectrum of each pure component after pretreatment; fitting and deducting interference peaks by adopting a spectrum analysis technology; and establishing a regression model for the ethylene, propylene and vinyl acetate characteristic spectrum segments from which the interference peaks are deducted and the volume contents of corresponding substances by using a partial least square algorithm, and obtaining the analysis value of the content of each component. The method effectively solves the problem of mutual overlapping of different component signals in the Raman spectrum, remarkably improves the accuracy of the analysis model, has the advantages of small demand of training samples, strong model extrapolation, short analysis time, accurate prediction result and the like, and is suitable for online quantitative analysis and detection of the EVA polymerization reaction feed content.

Measurement system and method are presented for determining spatial distribution of chemical elements in a sample. The system comprises a measurement unit and a control system. The measurement unit is adapted to produce primary radiation having spectral characteristic adapted to excite a number M of chemical elements in the sample to induce secondary radiation responses, and generate spectral measured data indicative of intensity of detected responses. The primary radiation interacting with the sample includes a sequence of two or more encoded radiation patterns of the primary radiation, each having its predetermined spatial intensity pattern. The measured spectral data includes a sequence of data pieces, each being modulated by the respective one of the two or more predetermined spatial intensity patterns of the encoded primary radiation and characterized by sparsity in spectral domain with respect to each spectral component of the secondary radiation response.

The invention relates to the technical field of gasoline detection, in particular to a method and a device for detecting methanol and ethanol in automotive gasoline based on a near infrared spectrum, and provides a near infrared spectrum detection method for alcohol concentration in gasoline without multivariate analysis modeling. Spectral components of a methanol component and an ethanol component are obtained by performing spectral projection on a near infrared spectrum of an alcohol substance-containing gasoline solution, and a standard curve is established by using the alcohol spectral components and corresponding concentrations of a standard solution with known mass concentrations, so that the influence of coexistence of methanol and ethanol on the predictive capacity of the standard curve is eliminated, and the predictive capacity of the methanol and ethanol-containing gasoline solution is predicted. The problem of serious overlapping of near infrared spectrum bands of different components is solved, and the solving process is simple.

The present invention relates to a method for creating a sound signal to be added to a sound library comprising one or more sound signals intended as a horn signal when output by a loudspeaker. The method comprises receiving a recording of a time domain signal of an existing horn in operation measured at evaluation distance, and analysing a frequency domain representation of the candidate sound signal and selecting one or more dominant spectral components with their respective amplitudes. The method further comprises - checking if a 1 / 3 octave frequency band containing said one or more spectral components contains at least a predetermined part of the power of said candidate sound signal, and, if that condition is not met, adapting the amplitude of said selected one or more spectral components, - generating a sound signal containing said one or more selected dominant spectral components and corresponding amplitude, - storing the sound signal in the sound library.

The application provides an optical system and a monitoring method for monitoring stimulated Brillouin scattering effect. The optical system for monitoring stimulated Brillouin scattering effect firstly delivers a narrow linewidth seed source into a laser amplifier through a first optical device to amplify the narrow linewidth laser, and guides stimulated Brillouin scattering light generated by the laser amplifier to a back light monitoring module to detect the back light power and spectral components of the stimulated Brillouin scattering light in real time through the back light monitoring module, so as to realize the purpose of simultaneously and accurately measuring the stimulated Brillouin scattering light power and observing the laser components, and is more conducive to judging whether the stimulated Brillouin scattering effect occurs. Further, the optical system can adjust the light splitting ratio of the first optical device and the back light monitoring module to protect the narrow linewidth seed source and the spectrometer in the back light monitoring module from the damage of the back light to the greatest extent, and achieve the purpose of accurately judging the stimulated Brillouin scattering effect and protecting the system safety.

We combine an array of waveguides having different lengths with a reconfigurable integrated optical network that allows full customization of the filter function after fabrication to provide optical filters. This customization can also optimize filter performance, compensating for fabrication errors or imprecision. This network can also self-configure automatically to the problem. Hence this approach provides a new class of compact, convenient, high-performance and highly customizable optical filters that are also suitable for mass manufacture on integrated photonics platforms.

The present invention presents improved systems and methods for performing multi-photon lithography. A line-scanning temporally focused two-photon lithography (LS-TFTPL) technique is capable of patterning three-dimensional structures with high throughput. An example LS-TFTPL system may include a pulsed laser, first optical components for expanding light pulses into an elongated or line cross section, a digital micromirror device for modulating the light pulses with a linear pattern and dispersing spectral components of the modulated light pulses, and second optical components for focusing the dispersed spectral components of the modulated light pulse at a line in or on a target material. The focused spectral components may alter the target material within selected voxels along the line, where the selected voxels spatially correspond to the linear pattern.

The present invention provides a method for estimating the subtransient reactance of a surface-mounted permanent magnet motor based on the finite element method, which relates to the technical field of motors. The method includes constructing a finite element model, setting the rotor angular frequency, and calculating the back electromotive force amplitude and synchronous reactance under specific working conditions; performing at least two groups of parameter settings on the model, short-circuiting the three-phase winding circuit, and calculating the three-phase short-circuit current waveform; for the three-phase short-circuit current waveforms under different groups of parameters, selecting a specific phase to calculate the waveform difference; performing a spectral analysis on the waveform difference, and calculating the subtransient reactance parameter under the initial rotor position condition according to the relevant parameters of specific spectral components, the back electromotive force amplitude, and the synchronous reactance; changing the initial rotor position, and taking the average value of the subtransient reactance parameters at multiple positions as the final result. The present invention considers the influence of rotor eddy currents, and based on the finite element method, accurately and efficiently estimates the subtransient reactance through multi-step calculations and parameter adjustments, helping to optimize the power system.

The invention provides an F-P spectral imaging system and method, and belongs to the technical field of spectral component measurement, and the system comprises a front lens which is used for collecting light energy and converting the light energy into emergent light meeting the limitation of the clear aperture of an F-P interferometer; the annular band optical filter comprises a central area and a plurality of concentric annular areas surrounding the central area, the bandwidth of each area is the same as the free spectral range of the F-P interferometer, and the annular band optical filter is used for eliminating level aliasing in emergent light of the front lens; the F-P interferometer is used for carrying out wavelength selection on emergent light of the annular band optical filter and outputting an interference field; the imaging mirror is used for projecting the interference field to the detector; and the detector is used for converting the projected optical signal into a digital electric signal. The F-P spectral imaging system which can maintain high spectral resolution and also can realize wide spectrum coverage is constructed by introducing the annular band optical filter which is accurately matched with the FSR of the F-P interferometer.

The object of the invention is a method and a system for spectral narrowing of laser light pulses, wherein the laser pulses are put into a group delay dispersion medium via an optical fibre, where they are chirped, subsequently, the optical signal obtained in this manner is split by means of a beam splitter (BS) into two parts; the first part of the optical signal is directed directly to an electro-optic phase modulator (EOPM), while the second part of the optical signal is directed via an optical delay element to a light detector (PD), which generates a pulsed output electrical signal corresponding to said second part of the pulsed optical signal directed to the light detector (PD), while the output electrical signal from the light detector (PD) is used to control the electro-optic phase modulator (EOPM) and controls said electro-optic phase modulator (EOPM) in such a way that the modulator executes the spectral shifts of time-distributed spectral components of laser light pulses to narrow the spectrum of these pulses.

The present invention discloses an optical convolution acceleration device and method based on the time-domain Talbot effect. The device includes: an optical pulse generation module configured to generate a first optical pulse cluster, wherein the amplitude of the optical pulses in the first optical pulse cluster represents the data to be convolved, the optical pulses in the first optical pulse cluster have a comb-shaped spectrum, and the comb-shaped spectrum has at least one spectral component; a convolution calculation module configured to edit the spectral components to obtain optical pulses with the target convolution kernel loaded on the spectrum, and perform convolution calculation on the data to be convolved based on the time-domain Talbot effect, and output a second optical pulse cluster; and a balanced photodetector configured to convert the second optical pulse cluster into an electrical signal and output the electrical signal as the convolution result. By representing the data to be convolved with the amplitude of the optical pulses, loading the target convolution kernel onto the spectral components of the optical pulses, and then performing convolution calculation based on the time-domain Talbot effect, the speed of convolution calculation is improved by utilizing the advantages of large bandwidth, low latency, and high speed of photon technology.

The invention discloses a synthetic aperture radar radio frequency interference suppression method based on two-stage processing, and the method comprises the steps: obtaining SAR single-view complex image data containing an interference signal, carrying out the fast Fourier transform of the SAR single-view complex image data along a distance dimension, and obtaining a distance frequency domain-azimuth time domain two-dimensional distance spectrum; based on a wavelet decomposition algorithm and a quartile distance method, preliminarily extracting a frequency spectrum component of an interference signal in the two-dimensional distance frequency spectrum to obtain a first interference signal distance frequency spectrum; based on a fast generalized singular value threshold low-rank sparse decomposition algorithm, separating the frequency spectrum component of the echo signal from the first interference signal distance frequency spectrum by using the low-rank characteristic of the interference signal to obtain a second interference signal distance frequency spectrum; and based on the two-dimensional distance spectrum and the second interference signal distance spectrum, obtaining an SAR single-view complex image after interference suppression. According to the method, the double bottlenecks that the notch threshold is difficult to select and the low-rank condition is difficult to meet in the traditional SAR radio frequency interference suppression are solved.

A movement prediction apparatus including first and second light output devices, a light reception device, and a processor. The first light output device outputs output-light having a spectral component of a first optical frequency comb of which a frequency comb interval is a first interval. The second light output device outputs reference light having a spectral component of a second optical frequency comb of which a frequency comb interval is a second interval. The light reception device receives combination light that is a combination of the output-light, reflection light that is the output-light reflected by a flying object rotor wing, and the reference light, and measures a distance to the rotor wing based on the combination light. The processor calculates a rotation amount that represents a rotational speed of the rotor wing based on a change amount of the measured distance, and predicts a movement of the flying object.

Self-calibrating adaptive optical systems, devices, and methods for biological analyte measurements are provided in accordance with various embodiments. Some embodiments include a method that includes emitting light from a laser. The light from the laser is filtered utilizing one or more short pass filters. The filtered light from the laser is focused onto an object. Light scatters from the object. The scattered light from the object is filtered utilizing a long pass filter. The scattered light from the object is collected into a spectrometer aperture. The scattered light from the object passes through a spectrometer to spatially separate the spectral components of the scattered light into a scattered spectra; the scattered spectra is filtered and detected on one or more optical sensors to form a detected spectra. The detected spectra is digitized to deliver a Raman spectra to a processor for analysis.