731 results about "Ir microscope" patented technology

Balloon probes, adapted for use in endoscopy and other medical procedures, are useful to obtain spectroscopic information reflected or emitted from a tissue of interest in the infrared spectral region. The information collected by the probe is useful in the diagnosis and treatment of disease. The invention also relates to methods utilizing these probes to analyze a surface of interest, in a minimally invasive manner, in connection with the diagnosis and treatment of disease.

Methods and apparatus for measuring cerebral O₂ saturation and detecting cerebral hypoxia-ischemia using multi-wavelength near infrared spectroscopy (NIRS). Near-infrared light produced by an emitter is directed through brain tissue. The intensity of the light that passes through the brain tissue is measured using photodiode detectors positioned at distinct distances from the emitter. This process is conducted for at least three wavelengths of near-infrared light. One of the wavelengths used is substantially at an isobestic point for oxy-hemoglobin and deoxy-hemoglobin, but the other two may be any wavelengths within the near-infrared spectrum (700 nm to 900 nm), so long as one of the additional wavelengths is greater than the isobestic point and the other is less than the isobestic point. Tissue oxygenation is calculated using an algorithm derived from the Beer-Lambert law. Cerebral hypoxia-ischemia may be diagnosed using the calculated tissue oxygenation value.

The invention relates to a method for diagnosing the crop water deficit through a hyperspectral image technology, and especially relates to a method for diagnosing the Lycopersicon esculentum Mill. leaf area water based on hyperspectral images. The method comprises the following steps: 1, acquiring Lycopersicon esculentum Mill. leaf hyperspectral image data through a self-constructed hyperspectral imaging system; 2, selecting a characteristic wavelength by optimizing through an adaptive band selection process to realize multidimensional datum dimensionality reduction; 3, dividing the image ofeach sample at the characteristic wave, counter-rotating, carrying out form operation to obtain a target image, and extracting the leaf gray level and the leaf texture characteristic from the target image; and 4, selecting an optimal characteristic subclass through a GA-PLS (genetic algorithm-partial least square) process by fusing the gray scale and the texture characteristic and aiming at ten characteristic variables, and establishing a partial least square regression model based on the optimal characteristic, wherein the correlation coefficient R between a predicted value and a measured value of the model is 0.902. Compared with routine detection methods, the method of the invention has the advantages of rapid detection speed, and simple and convenient operation; and compared with a single near infrared spectroscopy or computer vision technical means, the method of the invention allows obtained information to be comprehensive, and the accuracy and the stability of the detection result to be improved.

The invention relates to an infrared spectrum enhancement and detection method and an infrared spectrum enhancement and detection device based on a graphene nano antenna. The device comprises a light source, a collimating lens, a one-point detector and an MEMS (micro-electromechanical system) grating light modulator based on the three-dimensional graphene nano antenna. Infrared light emitted from the light source is irradiated to the MEMS grating light modulator based on the three-dimensional graphene nano antenna through the collimating lens, an interference signal of the MEMS grating light modulator can be detected by the one-point detector, a detection signal is demodulated through Fourier transform, a spectrum is reproduced, and trace molecules are detected according to obtained spectrum information; the device has the advantages of good stability, high response speed, high sensitivity, dynamic tunable broadband, high enhancement factor and the like, can be expected to greatly increase the variety of substances detected by an infrared spectroscopic analysis technology and improve the detection sensitivity of the infrared spectroscopic analysis technology, and has a huge development space and a wide application prospect.

An efficient method for the extraction of hemodynamic responses in Near-Infrared Spectroscopy (NIRS) systems is proposed to increase the spatial and temporal resolution without hardware overhead. The performance improvement is attributed to high Signal-to-Noise-Ratio (SNR) receivers, a modulation scheme, and a Multi-Input-Multi-Output (MIMO) based data extraction algorithm. The proposed system shows an over 2× increment in the figure of merit (FOM) compared to conventional designs. Experimental results support the validity of the proposed system.

Methods and apparatus for desolvating flowing liquid streams while retaining temporal resolution of dissolved substrates are disclosed. A novel small-scale self-regulating spray dryer preserves temporal resolution while desolvating a liquid chromatography eluent stream and depositing the solute onto an optical surface for infrared spectrographic analysis. The liquid eluent is pumped through a heated nebulizer to create a high-speed jet of solute containing liquid and solvent vapor. This jet is directed circumferentially inside a hot cylindrical cavity. Centrifugal force causes the larger liquid droplets to travel along the outer diameter of the cavity. The cavity surface is heated to cause the droplets to film boil. Film boiling reduces droplet contact with the cavity surface thereby retaining the solute in the droplets. The solute temperature is limited by controlling the pressure into which the solvent evaporates from the droplets. When the droplets are sufficiently small, Stokes drag from the exiting solvent vapor carries the droplets out through the center of the cylindrical cavity. After exiting, the superheated solvent vapor further dries the droplets. Solvent vapor is removed by condensation onto a cooled surface. A freezing point reducing agent may be added to improve removal of solvent condensate. Stokes drag from a non-condensable gas maintains the dried droplets in suspension. This suspension travels through an orifice that focuses the impaction of the dried droplets onto the optical surface for infrared analysis. The deposition surface is in an evacuated chamber and is temperature controlled to freeze liquid solutes yet allowing sublimation of residual solvent.

The invention relates to a method for preparing a high-oriented gamma phase polyvinylidene fluoride PVDF thin film. The method comprises the following steps of: 1) first, casting a thin film for PVDF liquor to heat, insulate and eliminate thermal history, and quickly cooling the PVDF thin film at 50 DEG C/min to 160-170 DEG C; and 2) applying pressure to melt by a polymethylsiloxane plate to apply a shear stress, standing at 160-170 DEG C, wherein the crystallizing form at 160-163 DEG C is converted to alpha crystallizing form, and conversion from alpha crystallizing form to gamma crystallizing form occurs at 168-170 DEG C; the crystallizing crystal nucleus is alpha crystal nucleus at 164-167 DEG C, and the crystallizing form at 168-170 DEG C is gamma crystallizing form. A polarizing microscope, a scanning electron microscope and an infrared spectrometer represent crystallization of the melt in a shear stress field and a crystal structure after crystallization, so that the method is simple in process, and simple, convenient and accessible, and the problem that pure gamma phase PVDF thin film cannot be obtained by isothermal crystallization is solved. The gamma phase PVDF thin film which is high in purity, high in orientation and excellent in thermodynamic property can be prepared.

The invention relates to a diffuse transmission spectrum and image information fusion method for detecting internal quality of honeydew melons on line and a device. The method comprises the following steps: establishing a honeydew melon internal quality nondestructive testing model and detecting the internal quality of a honeydew melon sample on line. The device comprises a conveying device, a signal control unit, a diffuse transmission spectrum acquisition device, a honeydew melon image acquisition device and a honeydew melon internal quality detection software system; drag rings for containing honeydew melons are arranged on the conveying device; each drag ring sequentially penetrates through an image acquisition chamber of the image acquisition device and a spectrum acquisition chamber of the diffuse transmission spectrum acquisition device; a layer sensor and two industrial cameras in the image acquisition chamber and a laser sensor and a near infrared spectrometer in the spectrum acquisition chamber are connected with a computer provided with the honeydew melon internal quality detection software system through the signal control unit. According to the method and the device, the internal quality of honeydew melons can be effectively detected, and the defect that internal quality indexes of the honeydew melons cannot be accurately detected through the image information is overcome.

The invention discloses an infrared absorption structure and an uncooled infrared detector based on the infrared absorption structure. The structure is composed of a bottom infrared reflecting layer with high conductivity, a first insulating layer, an infrared sensitive layer, a second insulating layer and a surface structure layer, wherein the above-mentioned layers are overlaid successively. The surface structure layer is manufactured by nonmetal conductive materials and has an island-like array structure in a circle or square shape, wherein the array structure is distributed according to two-dimension period. On the basis of the structure of the surface structure layer, it is easy to design a high-infrared absorption structure with a certain spectral width by selecting an appropriate surface conductive property; meanwhile, an infrared response of wide angle can be obtained. An infrared detector based on the infrared absorption structure has advantages of low thermal mass and no limitation of a cavity height of thermal insulation. Moreover, the infrared absorption structure is not sensitive to an incident angle of infrared radiation. Therefore, the infrared absorption structurecan be widely applied to fields including an infrared biochemical sensor, an infrared spectrometer, and an uncooled infrared thermal imaging system and the like.

The invention discloses a preparing method and application of polyose quaternary ammonium salt in oceanography engineering technique domain, which comprises the following steps: modify for high and low molecular weight chitose with glycidyl trimethyl ammonium chloride; adopting different condition; preparing hydroxypropyl trimethyl amchlor chitose; proceeding simulation for the structure with infrared spectrum; analyzing for IR spectrogram; replacing with N upper; possessing oxidation resistance desiccating moisture keeping active; setting the active stronger than chitose quaternary ammonium salt. This invention can increase oxidation resistance and desiccating moisture keeping property of the chitose, which can be used as antioxidant and humectant for food and cosmetic product.

Provided are a method and apparatus for the production of a polyimide film, which allow a polyimide film having physical properties with in-plane uniformity to be produced with high productivity. In the method for the production of a polyimide film, a solvent content of a self-supporting film is measured by infrared spectroscopy, and based on the measurement result, one or more kinds selected from a drying condition of a cast of a polyimide precursor solution, a post-heating condition of the self-supporting film, and an amount of extrusion of a polyimide precursor solution from a die are controlled.

A library of material samples is provided in a condition suitable for imaging using infrared (IR) spectroscopy. The samples are provided to one or more detection cells, each of the cells including or containing a reflective surface. Preferably, for imaging, an energy source (e.g. a source of infrared radiation) provides energy to the detection cells to interact with the samples. Thereafter, images (e.g., spectra) related to the samples are created based upon the interaction.

The present invention discloses an infrared image-spectrum associated intelligent detection method and apparatus, including: first searching for targets in a field of view (FOV), and performing image-spectrum associated intelligent identification sequentially on the searched targets, that is, first performing infrared image target identification on each target, and if a detection identification rate is greater than a set threshold, outputting an identification result and storing target image data; otherwise, acquiring an infrared spectrum of the target, and performing target identification based on infrared spectrum features. The present invention further discloses an apparatus for performing target detection using the above method, and the apparatus mainly includes a two-dimensional scanning mirror, a multiband infrared optical module, a long-wave infrared (LWIR) imaging unit, a broadband infrared spectrum measuring unit, and a processing and control unit. The method and apparatus of the present invention are improvements and enhancements of the conventional infrared target detection method and device, and may be used for infrared image detection, infrared image-spectrum associated detection of the target and infrared spectrum collection of the target. Compared with the conventional infrared detection device, the present invention has a higher cost performance, and can significantly improve the detection identification rate of the target.

The present invention discloses a traceable method for rice origin and application thereof, and belongs to the technical field of security and detection of agricultural product. The method is as below: pretreating paddy rice or polished rice into rice flour, acquiring spectral image by an infrared spectroscopy, pretreating the spectral image, establishing an infrared spectral signature mathematical model of rice origin, correcting the mathematical model, and identifying rice origin by the mathematical model. The method of has the characteristics of simple feedstock pretreatment, low detection cost, easiness to operate, fast detection, good repeatability and high accuracy and is applicable to for traceability and identification of the origin of rice and rice flour.

The invention provides a cobalt-free positive electrode material and a preparation method thereof. The cobalt-free positive electrode material comprises an inner core and a shell coating the inner core, the inner core is doped cobalt-free positive electrode particles, and the shell comprises a dopant; and the cobalt-free positive electrode material is subjected to infrared spectroscopic analysis, the peak area of a wave crest formed at the position of 520-620 cm<-1> is recorded as X, the peak area of a wave crest formed at the position of 800-900 cm<-1> is recorded as Y, and Y/X is larger than or equal to 0.010 and smaller than or equal to 0.035. Intercrystalline microcracks are reduced by optimizing doping, surface residual alkaline substances are reduced while the interface stability of the material is improved by coating, generation of gas is effectively inhibited, and the failure risk of the battery is further reduced.

Miniature planar IR waveguides of thickness 30–50 μm, consisting of 12-mm long, 2-mm wide strips of Ge supported on ZnS substrates and tapered quasi-tapered waveguides, tapered from a thickness of 1 mm at the ends to a minimum of 1–100 μm at the center, are disclosed. The surface sensitivity is increased as a function of incidence or bevel angle. The tapered waveguide improves the efficiency of the optical coupling both into the waveguide from an FTIR spectrometer, and out of the waveguide onto a small-area IR detector. The tapering makes it possible to dispense with using an IR microscope couple light through the waveguide, enabling efficient coupling with a detector directly coupled to an immersion lens. This optical arrangement makes such thin supported waveguides more useful as sensors, because they can be made quite long (e.g. 50 mm) and mounted horizontally. Furthermore, even with a 20-μm×1-mm cross section, sufficient throughput is obtained to give signal/noise ratios in excess of 1000 over most of the 1000–5000 cm-¹ range, with just 2 min of scanning at 8 cm-¹ resolution.

The invention relates to a centrifugal micro-fluidic chip for detecting oil and grease and a preparation method of the centrifugal micro-fluidic chip. The centrifugal micro-fluidic chip is a disk type centrifugal micro-fluidic chip with a microstructure and a microchannel; the centrifugal micro-fluidic chip is formed by sealing multiple layers of chips on which micro structures and micro channels with micro levels are etched, a Teflon film used as an infrared optical view window and a dual-layer sticky film; the mixing, extracting and separating process of a sample to be measured and an extraction agent is finished by taking a centrifugal force as a driving force of sample micro fluid; and the contents of the oil and the grease in the sample on each chip are quantitatively or qualitatively detected by taking an infrared spectrometer as a detection device. According to the micro-fluidic chip and the method, a plurality of groups of samples can be simultaneously treated and detected; reagents and samples are fewer, and thus the integration, the micromation and the automation of the oil and the grease are realized; and the centrifugal micro-fluidic chip has the characteristics of economy, quickness, portability and high efficiency and provides a brand-new analysis technology for detecting the oil and the grease conveniently, quickly and quantitatively.

The invention relates to a device for measuring the spectral responsivity of an infrared photoelectric detector. Most current Fourier transform infrared spectrometers cannot be directly used for measuring the spectral responsivity of the infrared photoelectric detector. The device for measuring spectral responsivity of the infrared photoelectric detector comprises a Fourier transform infrared spectrometer which comprises a Michelson interferometer, a sample room, a first computer, an infrared photoelectric detector, a preamplifier and a second computer. The infrared photoelectric detector and preamplifier are arranged in the sample room. The arranging position of the infrared photoelectric detector ensures that the photosurface can receive the interference intensity signal emitted by the Michelson interferometer. The infrared photoelectric detector is connected with the second computer via the preamplifier and an A/D collector, and the second computer is in communication connection with the first computer. In the invention, the Fourier transform infrared spectrometer can not only be used to measure the spectral responsivity but also have the previous function of measurement.

The invention provides a synthetic method of resin with mixing and solidification functions. The synthetic method of the resin with the mixing and the solidification functions comprises the steps that 80-110 g of polyisoprene dibasic alcohol, 4-10 g of 3-ethyl-3-hydroxymethyleneoxetane, 5-12 g of hydroxyl acrylate, 0.1 g of polymerization inhibitor para hydroxybenzene methyl ether and 0.01 g of catalyst dibutyltin dilaurate are added into a three-mouth flask with a thermometer, the temperature is raised to 65 degrees, then 18-32 g of diisocyanate starts to be dropwise added, the temperature is controlled to be 70-75 degrees, and reaction is performed for 2-3 h. The content of NCO perssad is analyzed by an infrared spectrometer, until the NCO peak disappears completely, the heating reaction is stopped, and the urethane acrylate modified by oxetane can be obtained. The resin with the mixing and the solidification functions can manufacture three-dimensional products with low shrinking percentage, low warping, good flexibility, ageing resistance, high machining precision, good photocuring performance and excellent mechanical strength; in addition, the synthetic reaction is simple in technology and easy to control, no special equipment is needed to be used, no solvent is needed, and the production cost is low.

The invention relates to a centrifugal micro-fluidic chip for detecting polycyclic aromatic hydrocarbon in soil and a preparation method thereof. The chip is a centrifugal micro-fluidic chip with a disc-shaped micro-structure and a micro-channel and is formed by sealing a plurality of layers of chips on which micron level micro-structures and micro-channels are engraved and a double-layer adhesive film, the centrifugal force is taken as the driving force of sample micro-fluid to finish the mixing, extraction and separation processes of a sample to be detected and an extract, and an infrared spectrometer is taken as a detection device to quantificationally or qualitatively detect the content of oil and grease in a sample on the chip. The centrifugal micro-fluidic chip and the preparation method thereof have the benefits that a plurality of groups of samples can be simultaneously treated and detected, the consumption of reagents as well as the samples is less, the integration, the miniaturization and the automation of polycyclic aromatic hydrocarbon detection are realized, the centrifugal micro-fluidic chip has the characteristics of economy, quickness, convenience in carrying and high efficiency, and a brand-new analysis technology platform is provided for conveniently, quickly and accurately detecting the polycyclic aromatic hydrocarbon.

The invention discloses a method for fast identifying the variety of edible oil through a near-infrared spectroscopy method.The method comprises the following steps that a to-be-identified edible oil sample with the unknown variety is selected; a near-infrared spectrogram of the edible oil sample is collected; the near-infrared spectrogram of the edible oil sample is preprocessed, and a preprocessed spectrogram of the edible oil sample is obtained; according to the preprocessed spectrogram of the edible oil sample, a palmitic acid quantitative model, an oleic acid quantitative model and a linoleic acid quantitative model are sequentially adopted for predicting the palmitic acid content, oleic acid content and linoleic acid content of the edible oil sample respectively; an optimized qualitative model is adopted for identifying the variety of the edible oil sample according to the obtained palmitic acid content, oleic acid content and linoleic acid content of the edible oil sample.The method for fast identifying the variety of the edible oil through the near-infrared spectroscopy method is safe, fast and high in identification accuracy, detection is convenient and fast, and high practical value and popularization value are achieved.

The invention relates to selecting a light source from a plurality of light sources, particularly to the selecting of a light source by pointing to it with a light source selection device. An embodiment of the invention relates to a light source selection device (10) comprising—at least one photosensor (36, 38, 40) with a field of view (20, 22, 24), wherein light (26, 28, 30) from one or more light sources (32, 34) may be received by the photosensor within the field of view, and - a photosensor output signal processing unit (42) being adapted to select one or more light sources by processing the light received by each photosensor. The present invention may be for example used to select appliances or devices or objects provided with the ability to transmit coded light in the ultra violet, visible or infra red spectra, for example lights, climate, curtains, kitchenware, etc.