56 results about "Source spectrum" patented technology

Methods, systems, and apparatuses are provided for estimating a location on an object in a three-dimensional scene. Multiple radiation patterns are produced by spatially modulating each of multiple first radiations with a distinct combination of one or more modulating structures, each first radiation having at least one of a distinct radiation path, a distinct source, a distinct source spectrum, or a distinct source polarization with respect to the other first radiations. The location on the object is illuminated with a portion of each of two or more of the radiation patterns, the location producing multiple object radiations, each object radiation produced in response to one of the multiple radiation patterns. Multiple measured values are produced by detecting the object radiations from the location on the object due to each pattern separately using one or more detector elements. The location on the object is estimated based on the multiple measured values.

PCT No. PCT/NO98/00031 Sec. 371 Date Jul. 29, 1999 Sec. 102(e) Date Jul. 29, 1999 PCT Filed Jan. 29, 1998 PCT Pub. No. WO98/36252 PCT Pub. Date Aug. 20, 1998A device for accurate and repeatable measurements of optical wavelengths, including an interrogation broadband light source (1) and a tuneable optical filter (2). A first part of the light is, in either order, transmitted through the filter (2) and reflected from, or transmitted through, at least one fibre Bragg grating (5) with known Bragg wavelength, providing an absolute wavelength reference, and directed to a first detector (7). A second part of the light is, in either order, transmitted through the filter and transmitted through, or reflected from a Fabry-Perot filter (8) with fixed and known free spectral range, creating a comb spectrum sampling the interrogation source spectrum to provide an accurate frequency/wavelength scale.

An optical fiber Fourier measurement with switching white light interferometer implements Fourier transforms on white light spectrum output from transducer interferometer, the carrier frequency is Fourier spectrum defined by interferometer optical path difference, two sets of carrier frequency components are separated and symmetrical in the frequency space; one set of components is filtered for anti-Fourier transforms and plural logarithm operation, phase information of the transducer interferometer is set as an imaginary part of signals and separated from the background formed by lighting source spectrum outline and interference fringes contrast; the phase information of the transducer interferometer is limited within (minus Pi, Pi) according to operation procedure, the 2 Pi phases polarize of phase information is phase unwrapped, the measuring range is not limited with the 2 Pi phase; absolute optical path difference of transducer interferometer is calculated from phase information, thus realizing testing. The method of the invention prominently increases accuracy of white light spectrum peak measuring method and Fourier peak value frequency switching method.

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 waveform design method is presented for controlled source electromagnetic surveying. A desired source spectrum (82) is specified based on a desired resistivity depth image resolution (81) with spectral amplitudes determined by expected noise levels (83). Techniques are disclosed for designing a source waveform to match the desired source spectrum. When better resolution is desired at a target zone, this leads to a required clustering of frequency components. A modulated waveform can be used to provide this clustering of frequency components.

The invention relates to a rapid nondestructive testing method for male and female silkworm pupas based on a spectrum technique. The rapid nondestructive testing method comprises the following steps: (1) selecting different types of silkworm samples, and carrying out spectrum scanning; (2) after the spectrum scanning, carrying out cocoon-breakage male and female detection on the silkworm samples; (3) constructing an optical model of silkworm cocoon sample; (4) constructing a spectrum collection module, and carrying out spectrum collection; (5) separating a collected spectrum; (6) preprocessing the separated spectrum, extracting a characteristic wavelength, and establishing a discrimination model of a single-source spectrum; and (7) carrying out multi-source information fusion, so as to obtain a nondestructive testing result of the genders of the silkworm pupas. Based on existing researches of reference data mining, an optical technique, a spectral analysis technique, a computer technique and sericultural science, the nondestructive testing is carried out on the male and female silkworm pupas in cocoons based on Raman, fluorescence and near infrared spectrum multisource information fusion by virtue of a combined method of theoretical analysis and experimental verification; and the method has the advantages that the detection accuracy is high, the detection speed is high, the silkworm pupas are not injured, and the like.

The invention relates to an SDABB source apportionment method, a system, terminal equipment and a computer readable storage medium. The method comprises following steps: step one, collecting and analyzing atmospheric particulate pollution sources and identifying labeling components in the atmospheric particulate pollution sources; step two, calculating the particle size distribution of the labeling components; step three, collecting and analyzing the components of environmental particulate pollution sources; and step four, utilizing a three dimensional factor analysis model of multisource spectrum matrix nesting parallel factor analysis to calculate the concentration matrix of the environmental particulate components; substituting the particle size distribution of the labeling components obtained in the step two into the algorithm to obtain a source spectrum matrix and a source contribution matrix, identifying the sources, and quantifying the contribution of the sources. The provided method has the advantages that the particle size distribution of labeling components of atmospheric particulate sources is substituted into a three dimensional factor source apportionment algorithm, the obtained results are more accord with the physical meaning of particle size distribution of particulate sources, and the accuracy of source apportionment results is improved.

The time delay (and therefore the OPD) between object and reference beams in an interferometer is manipulated by changing the spectral properties of the source. The spectral distribution is tuned to produce a modulation peak at a value of OPD equal to the optical distance between the object and reference arms of a Fizeau interferometer, thereby enabling the use of its common-axis configuration to carry out white-light measurements free of coherence noise. Unwanted interferences from other reflections in the optical path are also removed by illuminating the object with appropriate spectral characteristics. OPD scanning is implemented without mechanical means by altering the source spectrum over time so as to shift the peak location by a predetermined scanning step between acquisition frames. Finally, the spectrum is controlled on a pixel-by-pixel basis to create a virtual surface that matches the profile of a particular sample surface.

This invention relates to a space modulation interference spectrum image apparatus scaling method, which comprises the following steps: the spectrum curve flat even light source enters the integral ball; the source spectrum curve generates the absorption peaks; it generates the parallel light with certain visual angle through calibration lens system to measure the scaling source spectrum curve by device. The scaling light source generates interference image on the detector array through interference device, Fourier lens, and column prism through spectrum image front lens. It gets the spectrum curve of the scaling source through computer restoring. It compares the spectrum curve with the pre-set spectrum curve to get the needed scaling parameters.

In the present invention, the histogram model used in H-PMHT is extended to treat the problem of tracking using hyper-spectral data. Completely general spectral density functions are handled via the use of non-parametric methods. The present invention is not restricted to derivations based on knowledge of the spectral character of the source being tracked. The source spectrum can be estimated in a non-parametric fashion based on an initial track, and this allows the invention to adapt to the source spectrum in situ. The resulting method has improved crossing track performance on sources that have some degree of spectral distinction and will perform no worse than regular H-PMHT on sources that have identical spectral densities.

The invention belongs to an optical design technique, and relates to a depolarization light path design method of a high-precision fiber gyroscope and a depolarization light path design system. The depolarization light path design method of the fiber gyroscope disclosed by the invention comprises an online measurement module of a wide-spectrum light source spectrum, a calculation module of a light source coherence function, a detection module of coherence function correlation peak and decoherence length and a depolarization scheme design module. The depolarization light path design method comprises the following steps: firstly, judging a correlation peak position of a light source and calculating the light source decoherence length by adopting a corresponding algorithm by online measurement of the spectrum data of each light source; providing design parameters of a depolarization scheme light path, wherein the design parameters comprise a length requirement on each polarization maintaining fiber in a depolarizer, a length requirement on a Y-waveguide tail fiber, and a shaft angle requirement of fusion of the polarization maintaining fiber in the depolarizer. By adopting the design method and the design system, accurate parameters are provided for the structure design of the depolarization light path, the depolarization light path capable of effectively eliminating a gyroscope zero oscillation phenomenon is designed, the product quality and the production efficiency are improved, and the design method and the design system have good practical application values.

Methods for generating a customized spectral profile, which can be used to generate a corresponding filter, lamp or other type of illuminant. A trial spectrum is generated. A reference spectrum is determined or otherwise obtained. A SOURCE spectrum is determined or otherwise obtained. One or more optical indices are calculated using the trial spectrum and one or more of the optical indices are optimized by varying the trial spectrum to generate the customized spectral profile. A radiation force parameter can be used to minimize unsafe build-up of light in spectral regions. Adaptations of color rendering parameters can be used in the optimization process. Smoothing parameters can be used to enable easier design of filter structures. A reflectance camera can be used to measure reflectance data at one or more pixels of a digital representation of an object to be illuminated.

The time delay (and therefore the OPD) between object and reference beams in an interferometer is manipulated by changing the spectral properties of the source. The spectral distribution is tuned to produce a modulation peak at a value of OPD equal to the optical distance between the object and reference arms of a Fizeau interferometer, thereby enabling the use of its common-axis configuration to carry out white-light measurements free of coherence noise. Unwanted interferences from other reflections in the optical path are also removed by illuminating the object with appropriate spectral characteristics. OPD scanning is implemented without mechanical means by altering the source spectrum over time so as to shift the peak location by a predetermined scanning step between acquisition frames. The invention and its advantages are applicable to optical coherence tomography as well as conventional white light interferometry.

An optical spectrum equalizer and method, for modifying the output of a source of optical radiation. One or more optical filters are arranged in series in the path of the source. At least one filter defines a spatially-varying filter function. The position of at least one filter relative to the source is adjusted so that the filters together, as a whole, equalize the source spectrum by reducing the relative power of the source output at one or more of its wavelengths.

The invention discloses a data processing method for an ultraviolet differential gas analyzer. The method comprises the following steps: acquiring dark spectrum data; acquiring source spectrum data of detected gas; performing nonlinear compensation correction on the source spectrum data with the dark spectrum data and the source spectrum data as parameters, thereby obtaining target spectrum data; calculating the pseudo concentration value of the detected gas corresponding to the target spectrum data by a differential optical absorption spectroscopy method; and calculating the concentration value of the detected gas which the pseudo concentration value corresponds to according to a stepped judgment method. On one hand, the method disclosed by the invention can reduce noise effect on a spectrometer brought about by temperature, humidity and the like and ensures the reliability of data, and on the other hand, the method reduces the influence on high concentration gas and low concentration gas brought about by detection environments and improves the detection precision. In addition, the invention further discloses a data processing system for the ultraviolet differential gas analyzer.

The invention discloses a frequency domain reverse time migration algorithm based on the layered medium Green's function. The method comprises steps that S1, the dyadic Green's function of diagonal sampling points of the layered medium space is calculated within the effective frequency band range, and the Green's function of the entire imaging space is obtained through Chebyshev interpolation; S2,the spectrum of data recorded by a receiver after source spectrum or inverse time processing is respectively multiplied by the Green's function of the imaging space, and the forward extension wave field and the reverse extension wave field of the entire imaging space are calculated; and S3, the forward extension wave field and the reverse extension wave field are multiplied according to the cross-correlation imaging condition of the frequency domain, stepping calculation of wave field products of all the sampling frequency points in the effective frequency band range is performed, accumulation is further performed, and the sum after accumulation is subjected to Laplacian filtering and is then taken as the inverse time migration imaging result of the imaging space. The method is advantagedin that the imaging points at the same horizontal plane within the imaging space only require one-time calculation of the Green's function, so calculation cost is greatly saved, and high precision imaging of the underground medium can be quickly performed.

The invention discloses a system and method of sound source encryption of speech coding, which are applicable to vector quantization. The method comprises the steps that: an original sound source is encrypted through encrypting parameters; vector quantization coding is carried out to the sound source encrypted; vector quantization signal decoding is carried out to the result of the vector quantization coding; signal local decryption is carried out to the result of the vector quantization signal decoding according to the encrypting parameters; the error of the two is calculated according to the result of the original sound source and the result of local decryption received; the encrypting parameters are modified according to the error calculation results and the original sound source received later is encrypted according to the encrypting parameters modified. The system and method of the invention minimize distortion through the self-adaptive adjustment of the encryption matrix of source spectrum and effectively improve the distortion caused by encryption.

The invention discloses an organic liquid volatilizing and treating device with controllable conditions. The device comprises a tank body, a temperature controlling device, a pressure controlling device, an absorbing device, a condensing recovery device, a membrane separation device and an activated carbon adsorption device. The device can individually conduct VOC sample collection on various kinds of organic liquid, VOC source spectrums volatilized by all the kinds of organic liquid are obtained, and the interference of other VOC discharging sources is avoided; the actual temperature and pressure of the tank body can be simulated, and VOC discharging source spectrums of a storage tank can be sampled under different conditions of the four seasons, so that the collected VOC source spectrumsamples meet the actual discharging conditions; common organic gas treatment methods of an absorbing method, a condensing method, a membrane separation method, an adsorption method and the like can beindividually selected or used in a combining mode, so that VOC species in the sample organic gas is consistent with the actual conditions, and the discharging conditions of VOC species of gas generated and volatilized by different kinds of organic liquid after the treating device can be differentiated.

The invention provides a crosstalk spectrum calculation method comprising the following steps that step A, an interference source and sensitive equipment in a crosstalk system are confirmed; step B, interference source spectrum, interference source equipment impedance, interference source load impedance, sensitive equipment impedance and sensitive equipment load impedance are measured; step C, short-circuit and open-circuit input impedance of crosstalk wiring harnesses under different frequencies is measured, and frequency-dependent self-parameters and mutual parameters of the crosstalk wiring harnesses are calculated; step D, a crosstalk frequency domain model between the wiring harnesses is established, and a crosstalk frequency domain expression is solved; and step E, crosstalk spectrum is obtained by utilizing the measured interference source spectrum, all equipment and load impedance thereof and the calculated crosstalk wiring harness frequency-dependent parameters through the crosstalk frequency domain expression.

The present invention relates to a liquid crystal display. It possesses several color filters of red, green and blue three pixels and a backlight source. When suppose maximum luminance value of backlight source spectrum is about 1.0, the sum of products of luminance of backlight source spectrum and transmissivity of color filter of blue pixel about less than or equal to 2.0 in wavelength range of 490 nano to 540 nano, so that it can make the transmissivity spectrum of color filter and spectrum of backlight source be coordinated so as to obtain maximum representative colour gamut and can meet correspondent colour coordinate.