43 results about "Synthetic spectrum" patented technology

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.

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 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 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.

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 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 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 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.