267 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.

The invention discloses a metering equipment interference signal suppression method and system in an electromagnetic compatibility test, and the method comprises the steps: obtaining an input signal of metering equipment in the electromagnetic compatibility test, performing windowing processing on the input signal by adopting a self-adaptive fractional order window function, and then obtaining a frequency spectrum component of the input signal through self-adaptive fractional order Fourier transform; calculating the amplitude of the frequency spectrum component, comparing the amplitude with a power threshold value, and screening out the frequency spectrum component of the interference signal; establishing a spectrum model of the interference signal based on the interference signal spectrum component; and generating a frequency domain compensation signal considering interference signal phase correction, converting the frequency domain compensation signal into a time domain compensation signal, and superposing the time domain compensation signal and the input signal to obtain a signal after interference suppression. According to the method, the frequency spectrum characteristics of the signals in different frequency bands can be ensured to be clear, the interference signal components can be accurately identified, the energy distribution of the interference signals can be effectively simulated, and the high-efficiency interference suppression capability can still be kept in a variable signal environment.

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 relates to the technical field of automatic measurement of flow and liquid level, and discloses a gas flow online calibration system which comprises a component extraction module used for acquiring real-time sensor data, performing spectral component analysis on the sensor data, obtaining component data and calculating characteristic data of the component data; the preliminary compensation module is used for acquiring environment data and mass flow meter data, and performing environment compensation on the mass flow meter data by using the environment data to obtain preliminary calibration flow; the relation construction module is used for constructing a gas component association relation according to the characteristic data and the preliminary calibration flow; and the compensation calibration module is used for performing self-adaptive compensation on the initial calibration flow by using the gas component association relationship and the characteristic data to obtain calibration data. The problem that an existing gas flow online calibration system is still low in calibration precision can be solved.

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.

A personal care system comprises an imaging device configured to obtain images of a region of interest of an object and a processor. The processor is configured to obtain a spectral signature of an adjuvant on the region of interest, identify spectral components in the images and segment the adjuvant from the images by comparing the spectral signature to the spectral components of the images.

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 invention relates to a satellite-borne panchromatic-multispectral-hyperspectral remote sensing image integrated fusion method, which realizes purification of spatial high-frequency detail information and discriminative spectral information contained in a multi-source input image by means of the characteristics of a multispectral image, so that two pure characteristic components, namely a spatial component and a spectral component, are converged; the method is used for subsequent reconstruction; in spectral feature reconstruction, aggregation features are used as main branches, multi-scale coding features are used for detail injection, meanwhile, interactive reasoning is carried out on spectral features through channel expansion and splitting, upper and lower related clues are obtained, and finally an ideal image is generated. And the multi-source remote sensing space-spectrum high-fidelity fusion requirement under large spatial resolution difference and spectrum difference is met.

A method (1000) of generating a plurality of audio channels from audio containing height and non-height audio channels for playing back them with an immersive loudspeaker system of with at least one height loudspeaker (5) inside a listening environment, comprising: applying (1500) a virtual height filter (1300) to a portion of each height channel (1010) for, when playing back the height channel by one of the loudspeakers, attenuating spectral components of the height channel directly emanating from said loudspeaker (1;2;3;4) and for amplifying spectral components of the height channel reflected from a roof or an area close to the roof inside the listening environment, to generate a plurality of virtual height filtered audio signals which are added to the corresponding non-height audio channels for playback by corresponding loudspeakers; and playing back the remaining portions of each height audio channel with the at least one height loudspeaker (5).

The invention provides an optical system and a monitoring method for monitoring a stimulated Brillouin scattering effect, and the optical system for monitoring the stimulated Brillouin scattering effect comprises the steps: firstly, conveying a narrow-linewidth seed source into a laser amplifier through a first optical device, and carrying out the narrow-linewidth laser amplification; and the stimulated Brillouin scattering light generated by the laser amplifier is guided out to the return light monitoring module, so that the return light power and the spectral component of the stimulated Brillouin scattering light are detected in real time through the return light monitoring module, and the purposes of simultaneously and accurately measuring the power of the stimulated Brillouin scattering light and observing the laser component are achieved. Whether the stimulated Brillouin scattering effect occurs or not can be judged more easily; furthermore, according to the optical system, the narrow-linewidth seed source and a spectrograph in the return light monitoring module can be protected from being damaged by return light to the maximum extent by adjusting the light splitting proportion of the first optical device and the return light monitoring module, and the purposes of accurately judging the stimulated Brillouin scattering effect and protecting system safety are achieved.

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.

The invention discloses a generator stator winding dynamic turn-to-turn short circuit fault detection method and device, and relates to the technical field of generator state monitoring and fault diagnosis, and the method comprises the steps: measuring a generator rotor vibration signal in real time; transforming the vibration signal from a time domain signal to a frequency domain signal by using fast Fourier transform; and comparing the collected time domain signal and the converted frequency domain signal with each component of the frequency spectrum of the vibration signal under the normal condition, and judging whether the generator has a winding dynamic turn-to-turn short circuit fault or not. Whether the dynamic turn-to-turn short circuit fault of the stator winding occurs in the generator is identified by detecting the rotor vibration of the generator. The method is simple and easy to implement, overcomes the defects of winding dynamic turn-to-turn short circuit fault detection at present, is obvious in detection characteristic and good in effect, and provides reference for detection and diagnosis of generator stator winding dynamic turn-to-turn short circuit faults.

The subject matter of the invention relates to a method for the automatic technical diagnosis of rotating machines, including detection of faults in rotating machines, in particular vibration measurements of rotating machines by the automatic detection of changes in the signals of machine vibration. The method consists in that monitoring and diagnosis are performed in terms of identifying both the assemblies or parts of an object of the rotating machine subjected to the diagnosis, in such a way that vibration data are recorded in the form of a vibration signal from at least one vibration sensor (2) mounted on the housing of the mechanical elements of the rotating machine (1), wherein each subsequent vibration signal is recorded at the same length and at the same sampling frequency. Then, collected vibration signals are processed in a vibration data acquisition unit (3) equipped with a reductive-redundant mechanism (4) by means of which the vibration signal is modified by calculating the values of spectral components in the domain of frequency or orders and the values are segmented relative to subsequent tested spectral resolutions on the basis of current scale of class intervals. Then, an averaged spectrum is calculated and added to the state matrix and a statistical measure of the comparison of spectral amplitudes is calculated for individual class intervals at the standard score measure and the procedure is repeated for each tested spectral resolution in the range from the value equal to the inverse of the vibration signal length to half the sampling frequency. Finally, the results of the vibration growth index are saved, then are sorted from the highest to the lowest value thus allowing the potential occurrence of a fault to be determined in terms of identifying both a specific assembly or part of the rotating machine (1).

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.

An optical transmitter includes a frequency comb light source; a demultiplexer configured to demultiplex light output from the frequency comb light source into n channels (n is an integer of 2 or greater) at a wavelength interval Δλ; and n filters respectively connected to n output ports of the demultiplexer, the n filters being configured to reduce a high-order spectral component for each wavelength.

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.

In an embodiment an apparatus includes at least one optoelectronic laser configured to provide excitation radiation to a sample, the excitation radiation being generated by an electric current flowing through the at least one optoelectronic laser, a transistor configured to modulate the electric current flowing through the at least one optoelectronic laser in order to switch on and off generation of the excitation radiation and a spectrometer configured to analyze Raman light scattered from the sample in response to exposing the sample to the excitation radiation, wherein the Raman light includes one or more spectral components, wherein the spectrometer includes a diffraction element configured to split the Raman light into the spectral components, and wherein the diffraction element includes at least a photonic crystal or a plasmonic Fabry Perot filter.