378 results about "Ft ir spectroscopy" patented technology

Excitation light for normal light observation with wavelengths in the visible spectrum, which is output from a lamp, and excitation light with wavelengths in the infrared spectrum for exciting a fluorescent substance characteristic of being accumulated readily in a lesion are irradiated simultaneously to a living tissue, to which the fluorescent substance has been administered, through an endoscope. Fluorescence components are separated from light stemming from the living tissue by means of a separator such as a dichroic mirror, introduced to a first imaging device, and then imaged. Light components with wavelengths in the visible spectrum are introduced to a second imaging device and then imaged. Signals representing the images are subjected to signal processing, whereby a video signal is produced. For better diagnosis, two images are displayed while, for example, one of the images is superimposed on the other.

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.

A lightwave oven for cooking with light having wavelengths in the visible, near visible, and infra-red spectral ranges uses one or more quartz halogen tungsten lamps or quartz arc bulbs positioned above and below the food item and delivers light energy in select ranges of the electromagnetic spectrum during select portions of the cooking cycle.

Techniques for providing spectroscopic imaging integrates an acousto-optic tunable filter (AOTF), or an interferometer, and a focal plane array detector. In operation, wavelength selectivity is provided by the AOTF or the interferometer. A focal plane array detector is used as the imaging detector in both cases. Operation within the ultraviolet, visible, near-infrared (NIR) spectral regions, and into the infrared spectral region, is achieved. The techniques can be used in absorption spectroscopy and emission spectroscopy. Spectroscopic images with a spectral resolution of a few nanometers and a spatial resolution of about a micron, are collected rapidly using the AOTF. Higher spectral resolution images are recorded at lower speeds using the interferometer. The AOTF technique uses entirely solid-state components and requires no moving parts. Alternatively, the interferometer technique employs either a step-scan interferometer or a continuously modulated interferometer.

Methods and apparatuses of determining the pH of a sample. A method can comprise determining an infrared spectrum of the sample, and determining the hemoglobin concentration of the sample. The hemoglobin concentration and the infrared spectrum can then be used to determine the pH of the sample. In some embodiments, the hemoglobin concentration can be used to select an model relating infrared spectra to pH that is applicable at the determined hemoglobin concentration. In other embodiments, a model relating hemoglobin concentration and infrared spectra to pH can be used. An apparatus according to the present invention can comprise an illumination system, adapted to supply radiation to a sample; a collection system, adapted to collect radiation expressed from the sample responsive to the incident radiation; and an analysis system, adapted to relate information about the incident radiation, the expressed radiation, and the hemoglobin concentration of the sample to pH.

Provided is a surface Raman and infrared spectroscopy double-enhanced detecting method based on graphene and nanogold compounding.According to the method, light sources, a lens, a graphene nanobelt and gold nanoparticle composite substrate, an infrared Fourier spectrograph and a Raman spectrometer are included.Infrared light waves and visible light waves emitted by the infrared light source and the laser light source respectively pass through a beam combiner and then irradiate the graphene nanobelt and gold nanoparticle composite substrate, after the light waves and trace molecules adsorbed on the substrate interact, reflected light is gathered by the focusing lens to enter the infrared Fourier spectrograph, and meanwhile scattered light is gathered into the Raman spectrometer.Raman scattering signals of the trace molecules can be enhanced through the local area plasma effect of the gold nanoparticles, and meanwhile infrared absorption spectrum signals of the trace molecules can be dynamically enhanced through the graphene surface plasma effect within the broadband range.According to the method, double enhancement of surface Raman and broadband infrared spectroscopy signals is achieved on the same substrate, and the advantages of being wide in enhancement wave band, high in detecting sensitivity, wide in detected matter variety range, good in stability and the like are achieved.

A digital camera having a single image sensor made up of an array of filtered photosites used to capture non-visible light wavelengths in addition to the standard red/green/blue (RGB) or other visible light intensity values is presented. Essentially, this is accomplished using a separate filter disposed over each photosite that exhibits a light transmission function with regard to wavelength which passes only a prescribed range of wavelengths—some passing light in the visible light spectrum and others in the non-visible light spectrum. The photosites passing non-visible light wavelengths can be configured to pass light in the infrared (IR) light spectrum, which can be limited to just the near infrared (NIR) spectrum if desired, or alternately light in the ultra-violet (UV) light spectrum.

A multi-spectral super-pixel photodetector for detecting four or more different bands of infrared radiation is described. The super-pixel photodetector includes two or more sub-pixel photodetectors, each of which includes a diffractive resonant optical cavity that resonates at two or more infrared radiation bands of interest. By detecting infrared radiation at two or more different applied biases and by generating a spectral response curve for each of the sub-pixel photodetectors at each of these biases, the response to each of the individual bands of infrared radiation can be calculated. The response to each band of infrared radiation can be found by deconvolving the response at each bias. The super-pixel photodetector finds use in military and medical imaging applications and can cover a broad portion of the infrared spectrum.

Disclosed is a FT-IR spectroscopy method for the determination of the wax precipitation temperature, and the estimation of the amount of precipitated solid wax material (both crystalline and amorphous) present in a liquid hydrocarbon, such as a petroleum crude oil.

An interference coating (22) for reflecting both visible light and a portion of the region of the infrared spectrum is disclosed. The coating includes a dichroic structure of a plurality of layers of a material having a low index of refraction and a plurality of layers of a material having a high index of refraction. The coating has an average spectral high reflectance of at least 80% for wavelengths in the visible light section of the electromagnetic spectrum and of at least 50% for wavelengths in a portion of the infrared section of the electromagnetic spectrum at least 150 nm wide.

The invention discloses a high resolution micro infrared spectrometer based on an MEMS scanning micromirror. The high resolution micro infrared spectrometer comprises a fiber connecting device, an incident slit, a collimation reflector, a scanning micromirror, a blazed grating, a spherical surface focusing reflectors, an emitting slit and a high sensitivity unit infrared detector. A novel optical path structure is employed by the high resolution micro infrared spectrometer: an external optical signal to be measured is coupled into a spectrometer through the fiber and the slit and collimated by the spherical surface collimation reflector; the MEMS scanning micromirror and a diffraction grating are utilized to substitute a scanning raster in a traditional scanning raster spectrometer to realize optical splitting and spectrum scanning functions together; during torsional pendulum of the micromirror surface, a combination of two spherical surface reflectors carries out focusing and imaging on the spectrum, so that light with different wavelengths is focused and imaged and irradiates on the detector through the emitting slit successively to realize continuous detection of spectrum. The spectrometer based on the MEMS scanning micromirror provided by the invention has advantages of small volume, wide spectrum measurement scope, high resolution and low cost, etc.

A heterodyne detection technique for highly localized IR spectroscopy based on an AFM. A pulsed IR source illuminates a sample and causes contact resonance of an AFM probe, which is a function of localized absorption. The probe is operated in intermittent contact mode and is therefore oscillated at a resonance frequency. A secondary oscillation is mixed in to the probe oscillation such that the sum of the secondary oscillation and the IR source pulse frequency is near another harmonic of the probe. A mixing effect causes measurable probe response at the other harmonic allowing data to be taken away from the pulse frequency, resulting in background effect rejection and improved spatial resolution.

Manually portable reflectance spectrometer and method of detection of absorption and reflection of light, wherein the visible and invisible (infrared) light is derived from LEDs. A phototransistor or photodiode measures the light reflected by the surface being measured, and a digital converter ADC translates the phototransistor's output into a digital format display. Three or more LEDs blue, aqua, green, yellow, orange, crimson, red and infrared provide a range of readings across the visible and infrared spectrum.

A high-speed, high-resolution, broadband dynamic infrared scene generator based on semiconductor transducer conversion of visible spectrum scene images into infrared spectrum images. Wavelength conversion is accomplished in the semiconductor material through absorption of visible spectrum energy by valence electrons in a subsurface layer of the semiconductor material and photogeneration by valence band to conduction band electron transfer occurring within about one diffusion length of the semiconductor material surface. The semiconductor material used, for example Germanium or Silicon provides a band gap energy value that is smaller than the quantum energy level of the optical emission. Temperature of the semiconductor material may be maintained at a selected level above or below that of the infrared scene. Infrared images of higher frequency content than are achievable with conventional thermal heating infrared converters are accomplished. The invention thus includes down conversion of visible generated light in order to develop a semiconductor pixel-less Dynamic Infrared Scene Projector capable of simulating high-speed broadband IR scenery.

Apparatus and method for acquiring an infrared spectrum of a sample having or suspected to have an amide I band, an amide II band, an amide III band, an amide A band, an OH stretching region or a combination thereof. A representative method includes providing a sample; providing an internal reflecting element (IRE) with a functionalized tip; contacting the sample with the IRE to form a sample-IRE interface; directing a beam of infrared (IR) radiation through the IRE under conditions such that the IR radiation interacts with the sample-IRE interface once; recording a reflectance profile over a range of preselected frequencies, whereby an infrared spectrum of the of a sample having or suspected of having an amide I band, an amide II band, an amide III band, an amide A band, an OH stretching region or a combination thereof, disposed in an aqueous solution is acquired. Representative apparatus includes an internal reflecting element (IRE) comprising a reflection face located on the IRE at a region of intended contact between the IRE and a solublized sample; an infrared radiation source for supplying an evanescent wave of infrared radiation and directing the same from the outside of the IRE to the inside thereof so as to cause the infrared radiation to be incident on the reflection face, wherein the infrared radiation is reflected from the reflection face once; a sample cell; a functionalized tip comprising a surface-immobilized probe that partially or completely fills the volume exposed to the evanescent wave; and a detector for detecting the once-reflected infrared radiation.

The invention relates to a high temperature semitransparent material spectrum direction apparent emissivity inversion measuring device and method, belongs to the technical field of high temperature physical function material hot measurement and aims to solve the problems of low accuracy, low temperature upper limit, narrow measuring waveband and existence of dead measuring angle in the conventional semitransparent material spectrum direction apparent emissivity measurement. According to the invention, a fourier infrared spectrometer is used for measuring the high temperature normal direction transmissivity and the high temperature normal direction emissivity of a semitransparent material respectively, further the spectral refractivity and the spectral absorption factor of the semitransparent material are computed according to a radiation transfer inverse problem solving method, and finally the high temperature spectrum direction apparent emissivity of the semitransparent material is computed through the spectral refractivity and the spectral absorption factor of the material. The invention provides a method capable of accurately measuring the spectrum direction apparent emissivity of the semitransparent material, and can be widely applied to various fields of aviation, military, energy sources, chemical engineering and atmospheric sciences and the like.

A gas measuring apparatus includes: an infrared detecting section that receives an infrared ray from a measurement area and outputs infrared spectrum data relating to the infrared ray; a variation detecting section that detects, by using the infrared spectrum data, a variation in intensity of the infrared ray, which is caused in the infrared ray that radiates from the measurement area and which is caused by a measuring object gas in the measurement area; a converting section that converts the infrared spectrum data to radiance temperature spectrum data which represent wavelengths in an infrared region and radiance temperatures at each wavelength; a background temperature detecting section that detects, as background temperature of the measuring object gas, a maximum radiance temperature from among radiance temperatures represented by the radiance temperature spectrum data; a gas temperature detecting section that detects the temperature of the measuring object gas by using a radiance temperature in a wavelength band included in the water vapor absorption band in the infrared region from among the radiance temperatures represented by the radiance temperature spectrum data; and a computing section that computes surface density of the measuring object gas on the basis of the variation in intensity of the infrared ray, the background temperature of the measuring object gas, and the temperature of the measuring object gas.

The invention relates to a method for establishing an agilawood oil content near infrared spectral prediction model, and belongs to the technical field of physical and chemical detection. The method comprises the following steps: acquiring spectral data of agilawood powder by applying a DA7200 near-infrared spectrum analyzer; then guiding the spectral data acquired from Simplicity TM software in a format of JCAMP-DX into chemometrics software The Unscrambler 9.8 so as to obtain a near-infrared original spectrogram of an agilawood powder sample; and then correlating the convectional determined result of the agilawood oil content and near-infrared spectral data of a sample pretreated by spectrum by a partial least squares so as to establish the agilawood oil content near infrared spectral prediction model. The established model is relatively high in model prediction accuracy, can be used for actually predicting an unknown sample, and can be mainly used for detecting the fragrance formation quality of agilawood rapidly.

The invention discloses a spatial modulation Fourier transform infrared spectrometer based on the MOEMS technology and relates to the field of spectrum analysis instruments. The spatial modulation Fourier transform infrared spectrometer solves the problems that the FTIR is adopted in the prior art, the size is large, the weight is high, and online reliability is limited. The infrared spectrometer is based on the Michelson interferometer principle, two multistage step reflectors which are arranged in an orthogonal mode are used for replacing a movable mirror system and a fixed mirror in a system, staticizing of the system is achieved, and meanwhile the reliability, the repeatability and the real-time performance of the system are greatly improved. Real-time and online measurement on unknown objects is conveniently achieved. A grid type beam splitter is used for replacing a beam splitter and a compensating plate in a traditional Fourier transform spectrometer, the light weight of the system is achieved, a micro-reflector array is used for replacing a beam contracting system in the traditional Fourier transform spectrometer, and the requirement for the light weight and the microminiaturization of the spectrometer can be better met.