1029 results about "Absorbance spectra" patented technology

A catheter based method and apparatus for reflectance generated absorption spectral analysis of chronic inflammatory vascular conditions such as seen with atherosclerotic plaque within a blood vessel or other body cavity or compartment. The use of a bright mid range infrared light (mid-IR) source yields detectable reflected optical signals that may be sampled from an area smaller or larger than the typical diameter of a mammalian cell. The mid-IR light is delivered at selected mid-infrared wavenumbers. Using the apparatus and methods, the reflectance spectra and reflectance generated absorption spectra of a target tissue can be compared to reference spectra to identify and distinguish normal epithelium from tissue containing physiological markers indicative of vascular disease or other inflammatory conditions.

A photoelectric conversion element comprises a first photoelectric conversion part, the first photoelectric conversion part comprising: a pair of electrodes; and a photoelectric conversion film between the pair of electrodes, wherein the photoelectric conversion film comprises an organic photoelectric conversion material having an absorption peak in an infrared region of an absorption spectrum within a combined range of a visible region and the infrared region and generating an electric charge according to light absorbed, and the first photoelectric conversion part as a whole transmits 50% or more of light in the visible region.

A flow imaging system is used to implement surface plasmon resonance (SPR) detection to study bio-molecular interactions. The flow imaging system is used to capture SPR absorption spectra of large numbers of objects, where each object includes both a metal film capable of exhibiting SPR, and detecting molecules. Analyte molecules are added to a solution of such objects, and the result is introduced into the flow imaging system which collects full SPR spectral data from individual objects. The objects can be nanoparticles or larger particles that support metal island films. The SPR spectral data can be used to determine specificity, kinetics, affinity, and concentration with respect to the interactions between the detecting molecules and the analyte molecules.

The invention discloses a multi-wavelength high-sensitivity online monitor of multi-component NH3 and H2O based on semiconductor laser absorption spectroscopy. It contains host chassis and open long-path system. Equip power receptacle, switch, fiber connector and data transmission interface. It is characterized in that: there are near-infrared semiconductor laser, semiconductor laser controller, phase-locked amplifier, signal generator, data collecting and controlling module and infrared detector in host chassis which is connected with field optical system by fiber. Open optical system contains send-receive optical telescope and multielement reflector array. Optical telescope has input and output fiber couplers. The device realizes simultaneous testing of gas multi-component by using multi-wavelength and frequency division multi-signal detecting technique.

A novel multivariate model for analysis of absorbance spectra allows for each wavelength or spectral region to be modeled with just enough factors to fully model the analytical signal without the incorporation of noise by using excess factors. Each wavelength or spectral region is modeled utilizing its own number of factors independently of other wavelengths or spectral regions. An iterative combinative PCR algorithm allows a different number of factors to be applied to different wavelengths. In an exemplary embodiment, a three-factor model is applied over a given spectral region. The residual of the three-factor model is calculated and used as the input for an additional five-factor model. Prior to the additional five factors being applied, some of the wavelengths are removed. This leads to a three-factor model over the first region and an eight-factor model over the second region. This analysis of residuals can be repeated such that a one to n factor model could be applied to any given wavelength, or rather any number of factors may be employed to model any given frequency or spectral region. A method of predicting concentration of a target analyte from sample spectra applies a calibration developed using the inventive PCR algorithm to a matrix of sample spectral to generate a vector of predicted concentrations for the target analyte.

A reimageable medium for receiving an imaging light having a predetermined wavelength scope, the medium composed of: a substrate; a photochromic material capable of reversibly converting among a number of different forms, wherein one form has an absorption spectrum that overlaps with the predetermined wavelength scope; and a light absorbing material exhibiting a light absorption band with an absorption peak, wherein the light absorption band overlaps with the absorption spectrum of the one form.

The invention discloses a low-concentration, multi-component and high-sensitivity gas detection method based on integration of multiple spectrum technologies. Advantages of an ultraviolet differential optical absorption spectroscopy (DOAS) technology and an infrared tunable diode laser absorption spectroscopy (IR-TDLAS) technology are integrated, so that information integration and characteristic signal extraction of two kinds of spectrum are realized. The method disclosed by the invention is used for measuring the NH3 concentration in smoke by utilizing a TDLAS method and simultaneously measuring the concentrations of SO2 and NO2 in smoke by utilizing an ultraviolet DOAS method; interference of three components in the NO absorbancy is removed according to the obtained concentrations and an interference spectrum of three kinds of gas to the NO absorbancy, so that the NO concentration without cross interference is solved; and thus, the measurement precision and the detection lower limit are greatly increased.

An electroluminescent device includes a light-emitting layer containing a host material and: (a) a compound of Formula (1):

X¹—Ar¹—C(R₁)═C(R₂)—Ar²   (1)

wherein:

Ar¹ represents a divalent aromatic group;

Ar² represents an aromatic group;

X¹ represents at least one electron-donating group;

R₁ and R₂ independently represent hydrogen or a substituent; and (b) a light-emitting boron complex having an absorption spectrum that overlaps with the emission spectrum of compound (1). The device serves to improve luminance efficiency while maintaining good color purity.

According to the invention, there can be provided a non-aqueous electrolyte secondary cell whose capacity is hardly decreased even stored at high temperatures in a charged state.

The non-aqueous electrolyte secondary cell uses an insulation adhesive tape composed of a base material and a glue material. And in an absorbance spectra of the glue material measured using an infrared spectrophotometer so that the maximum peak intensity is 5 to 20% in transmittance, when peak intensities for C—H stretching vibration of 3040 to 2835 cm⁻¹ and C═O stretching vibration of 1870 to 1560 cm⁻¹ are respectively defined as I(C—H) and I(C═O), a peak intensity ratio represented by I(C═O)/I(C—H) is 0.01 or less.

A rapid diagnosis method for organ specific disease state is based on obtaining an infrared absorbance spectra of a patient's blood at a frequency range from about 400 cm<-1 >to about 2000 cm<-1 >and further from about 3000 cm<-1 >to about 3100 cm<-1>. Comparing it with the predetermined normal infrared absorbance spectra of known healthy subjects for the presence or absence of predetermined features such as increase or decrease of infrared absorbance, peaks at particular frequencies allows for accurate diagnosis of a disease of an organ, including most major organs such as a heart, lungs, stomach, liver, kidneys, brain, etc.

The present invention relates to a composite semipermeable membrane, which is useful as a reverse osmosis membrane or a nano-filtration membrane and comprises a polysulfone porous support membrane and a polyamide ultrathin layer formed on one of the surfaces of the porous support membrane, the composite membrane having the characteristic that in the infrared absorption spectrum obtained from the surface of a polyamide ultrathin layer of the composite semipermeable membrane, the ratio T (=Aa/As) of absorption intensity Aa at the absorption peak revealing C=O of polyamide in the region of 1600-1700 cm-1 to absorption intensity As at the absorption peak revealing polysulfone at a wavenumber around 1586 cm-1 is at least 0.05 and not higher than. The composite semipermeable membrane thus obtained can attain conversion of sea water into fresh water, desalination of brackish water, recovery of valuable matter in aqueous solutions, treatment of waste water, and particularly removal of impurities (e.g., organic substances) from water.

The invention discloses a dual-functional probe and a preparation method and application in detection of a G-quadruplex structure thereof. The probe is simple to prepare, readily available, and stable in structure, and can be used for the specific detection of G-quadruplex nucleic acid secondary structure, and fast detection of the secondary structure of a DNA sample in a solution according to an ultraviolet and visible absorption spectrum, a fluorescence spectrophotometer, or direct visual inspection of naked eyes. The method for detecting the G-quadruplex nucleic acid secondary structure by the probe has the advantages of simple and convenient operation, excellent and fast selectivity, and visibility by naked eyes, and overcomes the defects of high cost and equipment requirement, relatively complex technical operation and the like of other detection methods.

The invention discloses a method for measuring effective component content in kuhuang injection on line by near-infrared spectroscopy quickly. Effective components in kuhuang injection mainly comprise aloe-emodin, rhein, emodin, chrysophanol, physcion, sophocarpine and matrine so on. Near-infrared absorption spectroscopy collecting kuhuang injection make data of effective component content relate with near-infrared spectroscopy by HPLC method. Calibration model is built by partial least-squares regression method. Quick on-line measurement for effective component in injection can be accomplished. Studying result shows that near-infrared spectroscopy analyzing method can measure effective component in kuhuang injection effectively. The method is provided with simple pretreatment for sample, quick measurement and measuring multiple components at the same time. It can be used in on-line analysis and on-line quality control in tcm manufacture process.

The invention discloses an online calibration method of an in-situ type laser gas analyzer. A laser emitting unit, a laser splitting module, a signal detecting unit, a calibrating signal detecting unit, a signal switching module, a laser device controlling module, a signal processing module, a data analyzing module, a calibrating air chamber and a measuring pipe are provided. The online calibration method comprises the following steps that: during regular measurement, the signal detecting unit is connected with the signal processing module through the signal switching module so that the regular measurement is carried out on the in-situ type analyzer; and when calibration needs to be carried out, standard gas with known consistency is charged into the calibration air chamber firstly, the calibrating signal detecting unit is connected with the signal processing module through the signal switching module, and the signal processing module records a gas absorption spectrum obtained by the calibrating signal detecting unit and can be used for comparing a measurement value with a calibrating air consistency value, and thus the online calibration of the in-situ type laser gas analyzer is realized.

Described herein are spectrometers comprising one or more wavelength-selective filters, such as guided mode resonance filters. Some of the spectrometers described herein are configured for obtaining absorbance spectra in a discrete fashion by measuring absorbances of a sample at multiple discrete wavelengths or wavelength bands. In another aspect, methods are also provided for obtaining spectra, images and chemical maps of samples in a discrete fashion.

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 rapid detecting method and device for the optical property of a heavy-caliber optical element. Firstly, a pumping light beam is irradiated on a measurement point 1 on the surface of a measured sample, pumping light reflected by the measurement point 1 is irradiated on a measurement point 2 on the surface of the measured sample again after passing through an energy recovery reflecting mirror, by parity of reasoning, the pumping light interacts with the surface of the measured sample many times after passing through the energy recovery reflecting mirror, and thus, partial material characteristic change is caused from the measurement point 1 to the measurement N on the surface of the measured sample. The partial material characteristic change of the N measurement points is detected in parallel by using detecting light beams. The laser energy reflected by the measured sample is recycled by using the pumping light energy recovery reflecting mirror, so that the speed for detecting the optical property of the heavy-caliber optical element is greatly increased. The method and device can be used for various fields such as photo-thermal nondestructive detection, photo-thermal precise measurement, optical absorption spectrum, photo-thermal imaging, defect analysis and the like and are particularly suitable for rapidly detecting and imaging the weak absorption characteristic of a heavy-caliber laser reflecting mirror.

The invention designs a quantitative measurement method and device for a transient combustion field and belongs to the technical field of combustion diagnosis. The device comprises a clock synchronization and delay triggering module, a tunable laser generation module, an optical fiber beam splitter, a lens group, a photoelectric detector array, a high-speed multi-path data acquisition module, a high-energy pulse laser generation module, an area array photoelectric detector, a control and calculation module and the like. The optical parameters of a laser-induced fluorescence test system are calibrated by utilizing a steady-state combustion field; the calibrated device is used for measuring the same section of the transient combustion field; and low-resolution temperature distribution obtained by laser absorption spectrum tomography is substituted into an established laser-induced fluorescence calculation model, so that high-resolution temperature and the concentration distribution of measured groups and molecules can be obtained. According to the method and device of the invention, laser-induced fluorescence and a laser absorption spectrum are fused, so that the method and device are of great application value for the monitoring and diagnosis of a combustion field.

The invention discloses an octa-sulfonic phthalocyanine metal complex, and a preparation method and application thereof, and belongs to photosensitizers, photodynamic medicines or photosensitive agents. The compound disclosed by the invention has the characteristics of high photosensitive activity and high water solubility; the compound exists in water in the form of monomers and is favorable to play the photodynamic activity in a water body; the absorption spectroscopy is red-shifted to a near infrared area which facilitates the penetration of human tissues.