43 results about "Synthetic spectrum" patented technology

Methods, luminaires and systems for matching a composite light spectrum to a target light spectrum are disclosed. Method embodiments may be optimized for simultaneously maximizing luminous output with minimal chromaticity error. Method embodiments may further be optimized for simultaneously minimizing both chromaticity and spectral error. Embodiments of the present invention may be used with composite light sources having four or more distinct dominant colors within the visible spectrum.

The invention discloses an analytical method of multi-source spectrum fusion water quality. The method takes an ultraviolet / visible absorption spectrum signal and a multi-dimensional fluorescence emission spectrum signal of a water sample to be tested as input, and respectively adopts independent component pretreatment method to extract characteristic signals, remove interference information and obtain characteristic signals of the spectrums. According to the contribution of the characteristic signals of the spectrums to a water quality analyzing model, and aiming at avoiding information hiding, the combined characteristic signal number of the two types of spectrums is determined, the characteristic signals are combined into a spectrum characteristic signal federated data set, and the optimal spectrum configuration combination is solved. Based on an improved support vector machine algorithm, a Boosting method is adopted for modeling, and the optimal spectrum fusion water quality analyzing model is obtained by combining a plurality of modeling results. Based on the spectrum characteristic signal federated data set, the computation model is adopted to compute the comprehensive organic substance pollution index value of the water sample to be tested. The method has the remarkable advantages of high analyzing accuracy, high analysis speed, no pollution of chemical agent, simple operation and maintenance and the like.

A method for attenuating pump noise in a wellbore drilling telemetry system includes spectrally analyzing measurements of a parameter related to operation of a pump used to move drilling fluid through the drilling system. Synthetic spectra of the parameter are generated based on a number of pumps in the pump system and a selected number of harmonic frequencies for each pump. Which of the synthetic spectra most closely matches the spectrally analyzed parameter output is determined. The most closely matching synthetic spectrum is used to reduce noise in a signal detected proximate the Earth's surface transmitted from a part of the drilling system disposed in a wellbore.

The present invention provides the ability to use a comparison process (e.g., a matching process) to compare measured peak forms of elements and / or chemicals (e.g., previously measured peak forms for silicon under a particular procedure being monitored) and to collect Spectral data (eg, using a non-linear least squares fitting algorithm) were used for characterization of the film layer. Further, the present invention uses the collected spectral data to provide characterization of the film layer (eg, measurement of silicon oxynitride film thickness). For example, the obtained spectra may be cumulatively synthesized and the geometrical characteristics of the synthesized spectra may be used to determine concentration information of the constituents. Thickness measurements of thin films can be provided based on the above-mentioned component concentration information.

The invention discloses a method for estimating synthetic spectral sensitivity of a narrow-band multi-spectral camera. The method comprises the following steps: using the multi-spectral camera to shoot a multi-spectral image of a standard color card under an ambient light source, keeping the position of the multi-spectral camera unchanged, placing a calibration whiteboard at the standard color card, and shooting a multi-spectral image of the calibration whiteboard and using the multi-spectral image of the calibration whiteboard to correct a multi-channel response value of the standard color card; using a spectrophotometer to measure the spectral reflectance of the standard color card; and using singular value decomposition to calculate a unitary matrix and a singular value matrix of a spectral reflectance matrix composed of all color blocks, and calculating the synthetic spectral sensitivity of the multi-spectral camera in combination with the multi-channel response value calibrated bythe standard color card and a non-negative restricted condition. According to the method for estimating the synthetic spectral sensitivity of the narrow-band multi-spectral camera provided by the invention, the influence of noises on estimating the synthetic spectral sensitivity is reduced, actual physical characteristics of a narrow-band multi-spectral camera channel are considered, and a non-negative restriction calculation condition is added, so that the estimation effect of the synthetic spectral sensitivity of the narrow-band multi-spectral camera is improved.

The invention discloses a rapid and nondestructive meat quality detection method. The method comprises the following steps: acquiring reflection spectrums of various different microscopic structures of a meat sample to be detected by utilizing a microscopic spectrum system, and combining the spectroscopic data into a synthetic spectrum; selecting a characteristic wavelength combination which can reflect a predictive index in the synthetic spectrum by utilizing a stepwise regression method, establishing a multiple linear regression prediction model by using the characteristic wavelengths, and judging the meat quality index by using the prediction model. According to the method, the meat quality parameters can be rapidly and nondestructively detected, so that the detection means for quality of the meats in China is in line with that of the developed countries.

The invention discloses a method for detecting moisture in meats. The method comprises the following steps: acquiring a reflection spectrum of a meat sample to be detected and a reflection spectrum of the dried sample by utilizing a spectrum system, and combining the reflection spectrum of the meat sample to be detected and the reflection spectrum of the dried sample into a synthetic spectrum; selecting a characteristic wavelength combination which can reflect a predictive index in the synthetic spectrum by utilizing a stepwise regression method, establishing a multiple linear regression prediction model by using the characteristic wavelengths, and judging the moisture rate of the meats by using the prediction model. According to the method, rapid and nondestructive testing for the moisture rate of the meats can be realized, so that the detection means of the moisture rate of the meats in China is in line with that of the developed countries.

The invention provides a spectrum adjustment method for a multi-channel LED (Light-Emitting Diode) illumination system. The method comprises the following steps of presetting a spectrum adjustment target variable and a requirement thereof according to an illumination application demand; generating a synthetic spectrum of the multi-channel LED illumination system; calculating a target variable value of the synthetic spectrum; judging whether the target variable value of the synthetic spectrum satisfies the requirement of the preset spectrum adjustment target variable or not, and if not, regenerating the synthetic spectrum of the multi-channel LED illumination system until the target variable value of the obtained synthetic spectrum satisfies the requirement of the preset spectrum adjustmenttarget variable to obtain the synthetic spectrum which meets the illumination application demand. According to the spectrum adjustment method for the multi-channel LED illumination system, the adjustment for any target spectrum can be implemented, and the illumination control for the multi-channel LED illumination system can be effectively implemented, thereby providing important technical support for the research and development of related products.

The present invention relates to an apparatus for radiopharmaceutical quantification of a body part. It is described to provide (210) a processing unit (30) with at least one gamma image of a body part. The at least one gamma image was acquired by at least one gamma camera configured to detect gamma rays and / or X-rays. The at least one gamma image comprises spectral energy data that comprises datathat has resulted from the decay of at least one radiopharmaceutical. The processing unit is provided (220) with characteristic photon emission energies and emission probabilities associated with thedecay of the at least one radiopharmaceutical. The processing unit determines (230) an activity of the at least one radiopharmaceutical at a plurality of spatial positions in the body part. The determination for a spatial position of the plurality of spatial positions comprises generating (240) a synthetic spectrum and correlating the generated synthetic spectrum to an experimental spectrum generated from the spectral energy data for at least one position in the at least one gamma image that corresponds to that spatial position. Generating the synthetic spectrum comprises utilising the photonemission energies and emission probabilities associated with the decay of the at least one radiopharmaceutical. The processing unit determines (250) a spatial distribution of the at least one radiopharmaceutical in the body part.

The invention provides a method for correcting the wavelength drift of an array type spectrometer based on the combination of an optical switch and a mercury lamp, and relates to a method for correcting the wavelength drift in the optical field. The method comprises the following steps of selecting an emission spectrum of a mercury lamp as a determined spectrum, conducting the real-time X-axis calibration, outputting the real-time calibration result to a computer as the X-axis, and adopting the series output of the array type spectrometer as the Y-axis to synthesize a spectrogram. According to the technical scheme of the invention, the wavelength migration and the wavelength drift, caused by environmental factors and the factors of an instrument, during the pre-calibration process can be eliminated. Therefore, the accuracy of the instrument is improved and the requirement of high-precision measurement can be met. Moreover, the difference between instruments can be eliminated, and the model migration difficulty is lowered. In addition, the periodic manual calibration is not required, so that both the usage cost and the labor cost are saved.

A method for attenuating pump noise in a wellbore drilling telemetry system includes spectrally analyzing measurements of a parameter related to operation of a pump used to move drilling fluid through the drilling system. Synthetic spectra of the parameter are generated based on a number of pumps in the pump system and a selected number of harmonic frequencies for each pump. Which of the synthetic spectra most closely matches the spectrally analyzed parameter output is determined. The most closely matching synthetic spectrum is used to reduce noise in a signal detected proximate the Earth's surface transmitted from a part of the drilling system disposed in a wellbore.

A holographic imaging device and method realizes both a transmission type and a reflection type, and also realizes a long working distance wide field of view or ultra-high resolution. Object light emitted from an object, sequentially illuminated with parallel illumination light whose incident direction is changed, is recorded on a plurality of object light holograms for each incident direction using off-axis spherical wave reference light. The reference light is recorded on a reference light hologram using in-line spherical wave reference light being in-line with the object light. An object light wave hologram and its spatial frequency spectrum at the object position are generated for each incident direction using each hologram. A synthetic spectrum which occupies a wider frequency space is generated by matching each spectrum in the overlapping area, and a synthetic object light wave hologram with increased numerical aperture is obtained thereby.

The invention discloses a database-based Raman spectrum preprocessing method, which comprises the following steps: collecting Raman spectra of various samples and constructing a Raman spectral database, wherein a spectral matrix formed by Raman spectral data contained in the Raman spectral database is low-ranking; under certain preset integration time conditions, collecting original spectra of thesamples with the same components; when the noise of the original spectra exceeds a threshold, extracting appropriate spectral data from the Raman spectrum database to construct a temporary database,combining the original spectra and the temporary database into a spectral matrix, and using a low-rank spectral optimization algorithm to process the spectral matrix; extracting the Raman spectrum optimized by the algorithm and evaluating the noise of the Raman spectrum; if the noise does not exceed the threshold, obtaining the Raman spectrum of which the effect of the noise is eliminated and thesignal-to-noise ratio is satisfactory; otherwise, performing next iteration, and performing data optimization process again. The method effectively shortens the acquisition time of the spectral data and provides a broader application prospect for the Raman spectrum detection.

The invention discloses a synthesis method of N-color (7<=N<=9) full-spectrum white light by a two-step method. N primary color spectra is utilized to mix colors. According to the chromaticity coordinates of N primary color spectra, the chromaticity diagram is divided into three groups and corresponding graphs are drawn to form a blue-light group triangle, a yellow-green-light group triangle and ared-light group, and then each point in the three groups of graphs is taken to form an inner triangle. The synthesis method includes: firstly, calculating the luminous flux Ya, Yb, Yc of the three vertices of the inner triangle needed for synthesizing the color temperature according to the color coordinates of the target color temperature; secondly, calculating the luminous flux Y1, Y2, ...YN ofthe primary color spectrum corresponding to each vertex to obtain the synthesized spectrum of the inner triangle combination and calculating the corresponding chromaticity index; traversing all the inner triangle combinations, and obtaining the best ratio of N primary color spectra of the synthetic target color temperature. The ratio of the primary color spectrum from the target color temperatureis inversely estimated, which improves the screening accuracy, avoids blind calculation, reduces the calculation amount and shortens the screening time.

The present invention provides a polarizing radar target detection method based on a uniform phase diversity system. The method comprises: a radar employs orthogonal dual-polarization array receiving antenna and a uniform phase diversity emission polarization diversity system, and polarization-space joint spectrums are generated for receiving signals in each pulse repetition period; the polarization-space joint spectrums are overlapped to form a synthetic spectrum; after the modular operation of the synthetic spectrum, a four-dimensional unit average constant false alarm detection and trace point merging method is employed to obtain suspected object points; the synthetic spectrum perform orientation-pitching grid division in the orientation-pitching space, the polarized state distance standard deviation characteristic quantity of all the suspected object points in each orientation-pitching grid is calculated and is compared to a detection threshold, and it is determined whether suspected objects are radar targets or not. The polarizing radar target detection method based on the uniform phase diversity system can substantially improve the radar target detection capability of a main lobe having a plurality of adjacent interferences or in the condition that the main lobe has variable polarization interference.

An LED detection method comprises the steps that frequency spectrum data of light emitted by grains of an LED are detected; frequency spectrum data of light emitted by simulated fluorescent powder are detected; according to the ratio of the light emitted by the grains of the LED and the light emitted by the fluorescent powder, a synthetic spectrum of the grains of the LED and the fluorescent powder is calculated; the calculated synthetic spectrum is compared with standard or expected frequency spectrum data, so that whether the calculated synthetic spectrum is within the range of the standard or expected frequency spectrum data is determined; if the calculated synthetic spectrum is not within the range of the standard or expected frequency spectrum data, the ratio of the light emitted by the LED and the light emitted by the fluorescent powder is adjusted until the calculated synthetic spectrum is within the range of the standard or expected frequency spectrum data. The invention further provides an LED detection system.

The invention provides a data recovery method based on an optical fiber field-of-view synthetic spectrum imager. Firstly, the distribution condition of optical fiber surface ends is obtained through an image processing method, odd optical filters and even optical filters which are distributed same as the optical fiber surface ends are obtained by adopting an optical filter etching method; then, auniform light source, the odd optical filters and the even optical filters are used for obtaining detector data not interfered by adjacent optical fiber radiation, and the data is used for solving theenergy distribution of the optical fibers on each detector; finally, an imaging equation of an optical fiber input signal and a detector output signal is established by using an imaging relationshipof the field-of-view synthetic optical fiber spectrum imager, it is achieved that the detectors output recovery optical fiber input by solving the equation, and then two-dimensional space and one-dimensional spectral information are reconstructed through optical fiber input radiation signals.

The invention discloses a method for synthesizing a full-wave-band matching solar simulator spectrum and relates to a light source device special for spectroscopy. Gaussian spectrums are used for replacing spectrums of an LED light-emitting unit, six light sources are used for generating six Gaussian spectrums, and the full-wave-band matching solar simulator spectrum is obtained through synthesizing under reflecting of a reflector. The percentage of the spectral irradiance of the full-wave-band matching solar simulator spectrum in each wave band in the AM1.5G standard is completely matched with that of the full wave bands of the AM1.5G standard, in other words, the percentage of the spectral irradiance of the synthesized spectrum in the total spectral irradiance of the whole six wave bands is completely the same with the the percentage of the spectral irradiance of each wave band in the total spectral irradiance of the whole six wave bands in the AM1.5G standard. According to the method, the defect that the spectral mismatching degree between a synthesized spectrum adopted in the prior art and the spectrum in the AM1.5G standard is deviated is overcome.

The invention discloses a seabed combustible ice detector comprising an optical fiber a and an optical fiber b. One end of the optical fiber a is provided with a light transmission port a, and the other end of the optical fiber a is connected with a beam expander. One end of the optical fiber b is connected with a laser, and the other end of the optical fiber b is connected with a light transmission port b. The seabed combustible ice detector also comprises a shell. The top part of the shell is provided with a field diaphragm. The shell is internally provided with a Fresnel lens, an interference light filter, an imaging lens and a CCD camera which are arranged from the top to the bottom in turn. The detection method comprises the following concrete steps: step 1, the target information ofthe seabed is acquired; step 2, two spectral lines are selected from the imaging interference fringes obtained on the CCD camera in the step 1, the light intensity of the spectrum is detected on the CCD camera and the relative intensity S of the spectral lines is acquired from an HITRAN synthetic spectrum database; and step 3, the temperature, the pressure intensity and the molecular number density of the combustible ice, i.e. the characteristic parameters of the combustible ice, are calculated according to the light intensity and the relative intensity S of the spectral lines acquired throughthe step 2. Higher frequency and more accurate position determination of seabed combustible ice detection can be realized.

The invention discloses an LED spectrum synthesis method and a terminal. The method comprises the steps: S1, inputting material parameters of a light-emitting chip, material parameters of fluorescentpowder and corresponding characteristic spectrums in advance; S2, receiving the demand parameter and a simulation material, and obtaining a synthesis parameter according to the simulation material, the simulation material comprising a simulation light-emitting chip and a plurality of types of simulation fluorescent powder; S3, generating a demand spectrum corresponding to the demand parameter anda synthesis spectrum corresponding to the synthesis parameter on the same interface; and S4, synchronously modifying the synthesis spectrum according to the modification of the simulation material until the synthesis spectrum is consistent with the required spectrum. According to the method, the required spectrum and the synthetic spectrum can be generated on the same interface, so that a white light engineer can be assisted to modify the simulated material according to the displayed spectrum difference until the synthetic spectrum is consistent with the required spectrum, and the white lightengineer can be helped to quickly find the wafers, the fluorescent powder and the proportion combination thereof required by the LED product; therefore, the research and development speed of LED products is increased.

The invention discloses a database-based Raman spectrum preprocessing method, which comprises the following steps: collecting Raman spectra of various samples and constructing a Raman spectral database, wherein a spectral matrix formed by Raman spectral data contained in the Raman spectral database is low-ranking; under certain preset integration time conditions, collecting original spectra of thesamples with the same components; when the noise of the original spectra exceeds a threshold, extracting appropriate spectral data from the Raman spectrum database to construct a temporary database,combining the original spectra and the temporary database into a spectral matrix, and using a low-rank spectral optimization algorithm to process the spectral matrix; extracting the Raman spectrum optimized by the algorithm and evaluating the noise of the Raman spectrum; if the noise does not exceed the threshold, obtaining the Raman spectrum of which the effect of the noise is eliminated and thesignal-to-noise ratio is satisfactory; otherwise, performing next iteration, and performing data optimization process again. The method effectively shortens the acquisition time of the spectral data and provides a broader application prospect for the Raman spectrum detection.

The invention provides a self-observation spectrum library-based fixed star parameter measurement method for a large-scale patrol telescope. The fixed star parameter measurement method comprises the following steps: constructing an actual measurement spectrum library by using a theoretical spectrum library and other star catalogues and adopting a parameter mark transfer method; and realizing parameter measurement of the observation spectrum by using the actually measured spectrum library and adopting a chi-square minimum linear interpolation method. The method for constructing the standard data set has good expansibility, and the constructed spectrum library has important value in the astronomical field. The standard data set plays an important role in the fields of spectrum physical parameter determination, spectrum classification, star synthesis, spectrum teaching and the like.

The invention provides a method for measuring a three-dimensional displacement field and a strain field inside an object by using two three-dimensional Fourier transforms. Using micro-focus computer tomography, micro-nuclear magnetic resonance or laser scanning confocal microscopy to obtain three-dimensional images of objects with natural or artificial speckle structures inside before and after deformation. The three-dimensional images before and after deformation are divided into several sub-blocks of the same size, and the corresponding pairs of sub-blocks are subjected to the first three-dimensional Fourier transform one by one, and the synthetic spectrum is obtained by numerical interference in the spectral domain. In the second step, the three-dimensional Fourier transform obtains the extended impulse function containing displacement information, obtains the displacement vector of the corresponding sub-block by calculating the peak position, and obtains the three-dimensional deformation field inside the object from the displacement vectors of all sub-blocks. Subvoxel accuracy of displacements is obtained by interpolation. From the relationship equation between strain and deformation, the strain field inside the object is obtained.

The embodiment of the invention discloses a spectrum extraction method and device of a hyperspectral acquisition system in the technical field of spectrum processing. The spectrum extraction method ofthe hyperspectral acquisition system comprises the following steps: S1, scanning a spectrum image, and querying sequence coding information corresponding to each color position in a spectrum image; S2, extracting sequential codes to perform cloud numbering storage of the spectrum image; and S3, inputting a specified spectral number, calling a sequence code of the number, extracting a sequence color image according to the sequence code, synthesizing the sequence color image into a spectral image, and displaying the spectral image. According to the invention, when the spectral images are collected, the color codes in the spectral images are identified, the colors of all positions of the spectral images are stored according to the coding sequence, and when the spectral images are inquired, the color images can be directly synthesized by inputting the spectral numbers, so that the mutual conversion between the codes and the spectral images is realized.

The invention relates to a method for configuring a lighting system including a set of at least 3 light sources (Li) having different spectra (Si(λ)), including a step of automatically defining the intensities (φi) of each of the light sources of said set by minimising a distance between a reference spectrum (SR(λ)) and a synthetic spectrum (Ss(λ)) defined by the sum of the spectra (Si(λ)) of each source (Li) of said set weighted by said intensities (φi).

The embodiment of the present invention discloses a light source and a method for generating a natural spectrum, and relates to the field of optoelectronic technology to comprehensively consider the influence of the spectral shape of a synthesized spectrum on human health from the viewpoint of healthy illumination. The invention provides a healthy light source that comprises: an LED chip for emitting light of a first peak wavelength; a first fluorescent powder, a second fluorescent powder, a third fluorescent powder and a fourth fluorescent powder which generate light of a second peak wavelength, light of a third peak wavelength, light of a fourth peak wavelength, and light of a fifth peak wavelength respectively when excited by the light of the first peak wavelength. The ratio of the intensity of the remaining light of the light of the first peak wavelength absorbed by the first fluorescent powder, the second fluorescent powder, the third fluorescent powder, and the fourth fluorescentpowder, the intensity of the light of the second peak wavelength, the intensity of the light of the third peak wavelength, the intensity of the light of the fourth peak wavelength and the intensity of the light of the fifth peak wavelength satisfy a predetermined condition.

The present application provides a spectrum adjustment method for a multi-channel LED lighting system, which includes the following steps: according to lighting application requirements, preset spectrum adjustment target variables and their requirements; generate a composite spectrum of a multi-channel LED lighting system; calculate the target of the composite spectrum Variable value: judge whether the target variable value of the composite spectrum meets the preset requirements of the spectrum adjustment target variable, if not, regenerate the composite spectrum of the multi-channel LED lighting system until the target variable value of the composite spectrum obtained meets the preset requirements The spectrum of the target variable is adjusted to meet the requirements of the synthetic spectrum of the lighting application. The application can realize the adjustment of any target spectrum, and can effectively realize the lighting control of the multi-channel LED lighting system, thereby providing important technical support for the research and development of related products.

The embodiment of the invention discloses a light source for plant illumination. The light source for plant illumination comprises a substrate, a plurality of blue light chips with different emission spectrums which are arranged on the substrate, and a packaging body arranged on the substrate and covering the plurality of blue light chips. A synthetic spectrum of the plurality of blue light chips has a plurality of crest points in a wavelength range of 400 nm-540 nm, the normalized intensity of each of the plurality of crest points is greater than 60%, and the full width at half maximum of the synthetic spectrum is in a range of 25 nm-80 nm. The full width at half maximum of the synthetic spectrum of the light source for plant illumination can be as wide as possible in a blue light wave band below 500 nm, so that the full width at half maximum is close to that of a plant illumination model, and the requirements of different blue light wavelengths of various plants are met.