86 results about "Fiber-Optic Spectroscopy" patented technology

The invention provides various fiber optic probe assemblies for the delivery and collection of light in small spaces. The provided probe assemblies are small, flexible and well suited to performing minimally invasive spectroscopic examinations of biological tissues in-vivo. The invention also provides intravascular catheters that include the fiber optic probe assemblies.

A method for the evaluation of the ultrastructure of connective tissue, such as cartilage, including (a) providing a probe operative in the near-infrared or mid-infrared region of the electromagnetic spectrum, (b) positioning the probe either to be in contact with the connective tissue (for detecting attenuated total reflectance) or within a sufficient distance from the surface of the connective tissue (for detecting reflection), (c) detecting infrared radiation which penetrates the surface of the connective tissue for detecting attenuated total reflectance or which reflects off the surface of the connective tissue and (d) analyzing the infrared radiation from step (c) for at least one of peak height, peak area and frequency, and comparing at least one of the peak height, the peak area and the frequency for established values for at least one of peak height, peak area and frequency for normal connective tissue to detect a modification in the molecular structure of the connective tissue.

The invention discloses a measurement device and a measurement method of the fluorescence quantum efficiency of half integrating spheres. The measurement device comprises a constant-current and constant-pressure source, a patch LED light source, a half integrating sphere optical cavity, an optical fiber spectrometer and a computer, wherein the constant-current and constant-pressure source is used for supplying stable current to the LED light source; the half integrating sphere optical cavity is surrounded by a half integrating sphere shell and a half integrating sphere reflector with the high reflectivity; the inner wall of the half integrating sphere shell is coated by a diffuse reflection coating with the high reflectivity; the half integrating sphere reflector penetrates through the sphere centers; the plane reflector is provided with a round hole which is used for fixing the patch LED light source and a to-be-detected sample; the to-be-detected sample is arranged on the patch LED light source; and a detection hole is formed in the half integrating sphere shell, and is used for coupling connection of an optical probe of the optical fiber spectrometer. A spectrum signal is detected by virtue of the optical fiber spectrometer; the to-be-detected sample is arranged out of an optical fiber numerical value aperture region to prevent primary direct light from entering a detector; and the use of a baffle plate is avoided, and thus the uniformity of light distribution in the integrating spheres is improved.

The invention relates to a radiation spectrum measurement system of the sky polarized light, belonging to the optical electron testing technology field, which is applicable to measuring the sky polarized light and spatial and temporal distribution analysis. The measurement system is consisted of a polarization measurement head, a telescopic optical system, a fiber spectrometer system and a computer. Arranging the polarization measurement head comprises: arranging a cylindrical rotary head on the inside of an interface (1); screwing down a ding screw; then putting a wafer-shaped polarizer in the lumen of the rotary head; using an annular pressing ring to compress and fix the polarizer on the rotary head via two bolts. An equatorial is arranged on an A-frame. Then a refractor is arranged above the equatorial. The back-end of anti-ultraviolet optical fiber is connected on a spectrograph. Then a cosine corrector is arranged on the front-end of the anti-ultraviolet optical fiber. And then the probe-end of the cosine corrector is inserted into an interface (2) and the ding screw is screwed down. The system is provided with strong currency, wide application range and convenient operation.

A modification to a commercial Fourier Transform (FT) Raman spectrometer is presented for the elimination of thermal backgrounds in the FT Raman spectra. The modification involves the use of a mechanical optical chopper to modulate the continuous wave laser, remote collection of the signal via fiber optics, and connection of a dual-phase digital-signal-processor (DSP) lock-in amplifier between the detector and the spectrometer's collection electronics to demodulate and filter the optical signals. The resulting Modulated Fourier Transform Raman Fiber-Optic Spectrometer is capable of completely eliminating thermal backgrounds at temperatures exceeding 300 DEG C.

The invention discloses an in-situ measurement device and a measurement method of a scattering coefficient spectrum of an atmospheric aerosol. The measurement device comprises an integrating sphere, a solar simulator, a fiber spectrometer and a computer, wherein an internal reflectance coating of the integrating sphere is made from polytetrafluoroethylene, and collection efficiency of the scattered light is improved based on the advantage of truncated corners of the internal reflectance coating, so that the sensitivity in the measurement of the scattering coefficient spectrum is effectively strengthened. In the device and the method, a measure equation for the scattering coefficient spectrum in a wave range from 350 nm to 1000 nm is established, so that the difference of conversion responsivity caused by the difference of the wavelength in a photoelectric conversion process can be effectively avoided. The device and the method can detect evolution rules of the scattering coefficient spectrum of the atmospheric aerosol with the temperature, the humidity and the atmospheric pressure, and have the characteristics of being simple in principle, convenient in operation and fast in detection speed.

The invention relates to a spectral type solar radiance measuring instrument and belongs to the technical field of irradiance measurement and information processing. The measuring instrument is composed of an optical receiving unit, an optical coupling unit, a fiber optical spectrometer module unit, a global positioning system (GPS) module unit, a thermostatic control unit, a case and the like. According to the measuring instrument, key technologies such as solar radiation collection by a lens, fiber optic bundle transmission, grating light splitting and an array detector are adopted to measure solar radiance in ultraviolet, visible, near-infrared and infrared wave bands, and wired or wireless transmission of observation data is achieved through data interfaces. As a high-resolution solar irradiation observation instrument provided with a wavelength resolution function, the measuring instrument can obtain a two-dimensional spectrogram about irradiance-wavelength as well as a three-dimensional spectrogram about irradiance-wavelength-time at a certain moment, the data information quantity is rich, and broad application prospects in fields of meteorological observation, solar energy resource assessment, air pollution detection, modern agriculture and ecological security research and the like are provided.

The invention discloses a transmission-type optical fiber liquid level sensor with an irregular core structure. The transmission-type optical fiber liquid level sensor comprises a wideband light source, a sensing head and an optical fiber spectrum analyzer, wherein the sensing head is formed by welding a section thin core single mode fiber onto the middle of common single mode fiber, during measurement, one part of the thin core single mode fiber is positioned on a liquid level, and the other part of the thin core single mode fiber is positioned below liquid level. The common single mode fiber receives light coming from a wideband light source and is coupled to the thin core single mode fiber, so that the light is transmitted inside the thin core single mode fiber in a form of a mandrel and a cladding mode so a to form an interferometer similar to Mach-Zehnder interferometer. Light of the two parts interferes mutually and then is coupled into the common single mode fiber again and finally led into an optical fiber spectrum analyzer. By measuring drift amount of wave length of the characteristic peak in transmitted spectrum, the liquid-level variation can be calculated. The transmission-type optical fiber liquid level sensor has a compact structure, has the benefits of simplicity in preparation, high measuring accuracy, wide measuring range, safety, explosion protection and the like, and is particularly suitable for precision measurement to liquid level of inflammable liquid.

The invention discloses an optical fiber type sensor system based on surface plasma resonance and stimulated Raman scattering. The system comprises a broadband light source, a P-type polaroid, a focusing convex lens, a polarization controller, an optical fiber beam splitter, an optical fiber inclined end, a surface plasma resonance (SPR) probe and an optical fiber spectrometer, wherein the P-type polaroid is positioned between the broadband light source and the focusing convex lens; the focusing convex lens optically couples the polarization broadband to the polarization controller; the polarization controller is connected with one input end of the optical fiber beam splitter, and the optical fiber spectrometer is connected with the other input end of the optical fiber beam splitter; the optical fiber inclined end is connected with one output end of the optical fiber beam splitter, and the SPR probe is connected with the other output end of the optical fiber beam splitter; the free end of the optical fiber inclined end is inclined; the SPR probe comprises an optical fiber; the end face of an exposed fiber core is provide with a first metal film, and the periphery of the exposed fiber core is provide with a second metal film; a nano-film is arranged on the surface of the second metal film; and a sensitive film is arranged on the nano-film. The system has the advantages of high universality, sensitivity and stability, and capable of realizing remote monitoring.

The invention discloses a plant chlorophyll measuring instrument and a method thereof, which aims at solving the problems of time consuming, living plant destruction, and the like. The plant chlorophyll measuring instrument consists of a computer, a fiber spectrometer and a measuring probe, wherein, the computer is electrically connected with the fiber spectrometer, and the fiber spectrometer and the measuring probe are connected optically and electrically. The method for measuring plant chlorophyll comprises the following steps: 1) the computer is started up, and the devices are tested at first, if the devices are normal, the fiber spectrometer sends a signal to a laser generator to turn on a laser diode, and the fiber spectrometer starts to collect fluorescence which is excited by laser at the same time; 2) laser radiated from the laser diode of the laser generator radiates on plant leaves directly, and excited fluorescence is received by a fluorescence receive probe and introduced into the computer after being treated by the fiber spectrometer; 3) the computer analyses and processes the introduced data; 4) the computer judges the analyzed and processed result, displays and saves the result which conforms to the reality. The invention is suitable for plant with thin and thick leaves.

The invention provides a measuring apparatus for a continuous spectrum bidirectional scattering distribution function (BSDF), which relates to optical measurement equipment. The invention aims to overcome the problems of incapable measurement of the continuous spectrum BSDF, a narrow measurement spectral band, a small measurement angle and a low measuring speed. The rotating shaft of a rotating table board is connected with the motor shaft of a stepping motor; a sample ring is fixedly arranged at a through hole in the center of the rotating table board; a lighting source probe is fixedly arranged above the sample ring; a collimation amplifier assembly is fixedly arranged at a ray emitting lens of the lighting source probe; a reflection ray reception probe is installed above the sample ring, and a ray reception lens of the reflection ray reception probe faces the sample ring; a transmitted ray reception probe is fixedly arranged below the sample ring; a ray reception lens of the transmitted ray reception probe faces the sample ring; a ray signal input end of a control and data processor is connected with a ray signal output end of a two-channel fiber spectrometer. The measuring apparatus provided by the invention can be extensively used for measuring optical scattering characteristics of a material.

The invention provides a quantum efficiency calibration device for a CCD (charge coupled device), comprising a light source, a monochromator, an integrating sphere, a monitoring detector, a fiber optic spectrometer, a data acquisition system, a precise displacement platform, a CCD drive circuit and a control system; the output light of the light source and the monochromator is injected to the integrating sphere through four symmetric directions; the fiber optic spectrometer obtains the wavelength of the output light at the output port of the integrating sphere through a light collector; the precise displacement platform adjusts the photosensitive surface of the tested CCD to be positioned in the center of the light outlet hole of the integrating sphere; the data acquisition system collects one frame or multiple frames of the output signal of the tested CCD; the monitoring detector obtains the light power distribution of the integrating sphere at the output port of the integrating sphere; the control system changes the output wavelength of the monochromator according to certain stepping and tests the quantum efficiency of the CCD at the next wavelength point and draws the changing curve of the quantum efficiency of the tested CCD, along with the wavelength.

The invention discloses a vehicle-mounted portable liquid chromatographic instrument. The liquid chromatographic instrument comprises a double-motor straight-belt infusion pump, a sample feeding valve, a fluorescence and ultraviolet-visible absorption integral circulation tank, an optical fiber, an optical fiber spectrograph, a light source and a built-in wireless router, wherein the double-motor straight-belt infusion pump is connected with an inlet of the sample feeding valve; an outlet of the feed sampling valve is connected with a high-performance chromatograph column; an outlet of the high-performance chromatograph column is connected with the circulation tank; the light source is guided into the circulation tank through the optical fiber; transmission light or fluorescence of the circulation tank is guided into the optical fiber spectrograph through the optical fiber, is converted to an absorbance or fluorescence signal to be output; a control module is used for controlling and carrying out data collecting and processing on the infusion pump, the sample feeding valve and the optical fiber spectrograph through a wireless network. The vehicle-mounted portable liquid chromatographic instrument is complete in function, high in precision, small in size, good in anti-seismic property and applicable to field fast check of food safety and environmental protection.

The present invention relates to a plant leaves health monitoring system based on visual image spectrum detection technology. The system includes an image spectrum detection unit, an illumination component and a first camera obscura. The image spectrum detection unit and the illumination component are mounted within the first camera obscura. The image spectrum detection component includes a lenses, a beam splitting cube, an area array CCD camera, a DMD digital micromirror component, a convert lens group, a fiber optic coupler, optical fiber, an optical fiber spectrograph and a computer; and the area array CCD camera, DMD digital micromirror component and the optical fiber spectrograph are connected to the computer; and the optical fiber spectrograph is connected to the optical fiber coupler through fibers. The detection system provided by the present invention does not require spectrum measurement and storage of all the pixels, or spectral-dimensional scanning, so as to effectively improve the detection speed. By the high-precision optical fiber spectrograph, wide spectrum measurement can be realized, and at the same time the spectrum resolution can be raised to delta lambda / lambda=0.0001 magnitude.

The invention discloses a device for synchronously measuring the power, the spectrum and the beam quality of a high-power fiber laser. A collimator, a high-reflectivity mirror group, first wedge glass, a first multi-slot pluggable attenuator, a convex lens and a fiber probe are successively arranged along the same optical axis and form a spectrum-measuring optical path. The collimator is arranged at the output end of the fiber laser to be tested. The fiber probe is connected with a fiber spectrometer. A plane-concave mirror and a power meter target surface are successively arranged on the reflection optical path of the high-reflectivity mirror group. The power meter target surface is connected with a power meter. Second wedge glass is disposed on the reflection optical path of the first wedge glass. The second multi-slot pluggable attenuator and a beam quality analyzer are successively disposed on the reflection optical path of the second wedge glass. The above components are arranged on an optical platform. The device synchronously measures the power, the spectrum and the beam quality of the high-power fiber laser, improves measurement efficiency, reduces the influences of interference factors such as optical aberrations and pumping light on a measurement result, and improves measurement accuracy.

The invention relates to a fluorescence type glucose capillary biosensor. The biosensor comprises nano sensors, a capillary coupling device, capillaries, a light source, a fiber optic spectrometer and a probe, wherein the nanometer sensors are distributed on the inner walls of the capillaries; the capillary coupler is connected with optical fibers and hoses; the optical fibers can be used for receiving an exciting light generated by the light source; the hoses can be used for receiving liquid to be detected; and a new fluorescence spectrum generated by the liquid to be detected and the nano sensors under the excitation of an evanescent field produced by the exciting light is received by the probe, and the probe transmits the received fluorescence spectrum to the fiber optic spectrometer to be analyzed. According to the fluorescence type glucose capillary biosensor, the capillaries are adopted for sampling, thus the dosage of samples to be detected can be obviously decreased, and reagents are saved. A fluorescence signal is excited through the evanescent field, therefore, the background fluorescence in a biological sample can be reduced efficiently, and the lower detection limit can be elevated.

The invention discloses a fiber light-splitting multipath ultraviolet light source. According to the invention, an ultraviolet silica fiber is used as a multipath light splitter for providing a multipath ultraviolet light source required in an ultraviolet fiber spectroscopy process analysis process. The fiber light-splitting multipath ultraviolet light source comprises a light source, a lens, a fiber splitter, a fiber coupler, a common-end fiber group and a branch-end fiber group, wherein the common-end fiber group comprises a plurality of parallel fibers, the branch-end fiber group comprises a plurality of parallel fibers, the light source is arranged at one focus of the lens, input ends of all fibers of the common-end fiber group are arranged at another focus of the lens, and all the fibers of the common-end fiber group, the fiber splitter, all the fibers of the branch-end fiber group and the fiber coupler are connected with Y-type fibers of a fiber in-situ drug dissolution / release tester in sequence.

The invention provides an accurate measurement method for the signal-to-noise ratio of a fiber optic spectrometer. The method includes the following steps that first, related devices are connected; second, measurement on the signal-to-noise ratio of the fiber optic spectrometer under different light intensities is achieved; third, the specific value between a correction average value mu of a signal corresponding to the ith exposure pixel of an array photoelectric detector and a jittering value sigma of a signal deflection average value is calculated through N times of signal acquisition and measurement. By the adoption of the scheme, the method can adapt to the measurement requirement of the signal-to-noise ratio of the fiber optic spectrometer, not only can influences of stray light be decreased or reduced, but also the intensity of incident light of the fiber optic spectrometer can be conveniently and fast changed through a variable optical attenuator, and accurate measurement on the signal-to-noise ratio of the fiber optic spectrometer under different light intensities is achieved.

The invention discloses a light aging test frame for a fugitive dye of silk fabrics. The light aging test frame comprises a base with a detection substance placing area, wherein a vertical column is arranged on the side edge of the base; a movable rod and a light source traveling device are connected to the vertical column; the movable rod can move up and down; an input optical fiber of a miniature fiber optic spectrometer is connected to the upper part of the light source traveling device; the side edge of the light source traveling device is connected with an output optical fiber of the miniature fiber optic spectrometer. According to a light aging test method using the light aging test frame for the fugitive dye of the silk fabrics, the miniature fiber optic spectrometer is used as a main body, and the input illumination intensity is changed by sliding of the movable rod in the light aging test frame, so that the fading degree of the fugitive dye of the silk fabrics is changed along with the change of the input illumination intensity, and the aging degree of the fugitive dye of the silk fabrics under the illumination is judged. The light aging test frame has the advantages that the wavelength range is wide; the detection speed is high, and the aging time is short.

A system for real-time monitoring of flame properties in combustors and gasifiers which includes an imaging fiber optic bundle having a light receiving end and a light output end and a spectroscopic imaging system operably connected with the light output end of the imaging fiber optic bundle. Focusing of the light received by the light receiving end of the imaging fiber optic bundle by a wall disposed between the light receiving end of the fiber optic bundle and a light source, which wall forms a pinhole opening aligned with the light receiving end.

A system for real-time monitoring of flame properties in combustors and gasifiers which includes an imaging fiber optic bundle having a light receiving end and a light output end and a spectroscopic imaging system operably connected with the light output end of the imaging fiber optic bundle. Focusing of the light received by the light receiving end of the imaging fiber optic bundle by a wall disposed between the light receiving end of the fiber optic bundle and a light source, which wall forms a pinhole opening aligned with the light receiving end.

The invention provides a dye liquor concentration in-situ on-line monitoring method. The dye liquor concentration in-situ on-line monitoring method comprises the following steps that 1, an optical fiber sensing probe is put into dye liquor needing to be monitored; 2, light beams emitted by a light source are transmitted and are partly adsorbed by the dye liquor; the penetrable light beams reach a reflection mirror and are reflected into the dye liquor by the reflection mirror; the reflected light beams are adsorbed by the dye liquor again; and the penetrable light beams return to an emission mirror, 3, the light beams returning to the emission mirror are transmitted to an optical fiber spectrometer by optical fibers and through the optical fiber spectrometer, an absorbance value and a transmittance value at a specific wavelength are obtained; and 4, an analysis result obtained by the optical fiber spectrometer is transmitted to an analysis processing device; and the analysis result obtained by the optical fiber spectrometer is processed by the analysis processing device so that dye liquor concentration variation with time is known. The dye liquor concentration in-situ on-line monitoring method solves the problem that the existing dye liquor concentration on-line monitoring method has hysteresis quality and can produce a large error. The dye liquor concentration in-situ on-line monitoring method provided by the invention can realize real-time dynamic in-situ on-line monitoring of a dye liquor concentration.

The present invention relates femtosecond pulse stretching, and disclose an adjusting method for a cylindrical surface stretcher grating pair. The adjusting system comprises a cylindrical surface convex mirror, a cylindrical surface concave mirror, a broadband light source, an aperture diaphragm, a demo lens, a fiber optical spectrometer and an adjusting platform for installation of the fiber optical spectrometer, a first raster and a second raster. The first raster and the second raster are to be adjusted. Adjusting of the first raster and the second raster employs similar methods. An adjusting raster is perpendicular to output light of the broadband light source. The position of a probe of the fiber optical spectrometer is fixed, and then the rasters are rotated to make the peak wavelength of diffracted light to be the same with a theoretical calculating value. The diffracted light is utilized to enable the raster pair to be parallel. The adjusting method of the invention has advantages that the operation is simple; the precision is high; the application scope is broad; restrictions by raster levels and vertical staggering distances will not exist; working surfaces of the raster pair can be oriented towards the same direction.

A chemical and biological transducer is prepared by setting two long period fibre gratings, fibre core and fibre covering on one piece of fibre to form a MZ interferometer and then placing a film layer sensitive to chemical or biological molecule on fibre covering surface to form evanescent wave transducer of fibre MZ interferometer structure. The sensing system comprises light source of wide band, optical fibre, chemical and biological transducer of evanescent wave and MZ interference in optical microstructure, fibre spectrograph and computer.

The invention provides a 45-degree annular illumination device used for an on-line light splitting color photometer, and belongs to the technical field of color measuring illumination. The device meets the measuring error requirements caused by uniform illumination and tested object vibration compensation in the on-line color measurement, and comprises a pulse xenon lamp, frosted glass, frosted glass diaphragm, a first tubular diaphragm, a second tubular diaphragm, a flat plate diaphragm, a cylindrical surface annular reflector, a lens group, a reflecting prism and a sample measuring branch optical fiber. The device is particularly suitable for being used for the on-line non-contact color measurement, the 45-degree annular illumination can realize more uniform illumination effect on a tested object, the test result stability is enhanced, the illumination device is modularized, the optical fiber interface is standardized, the connection with a universal optical fiber spectrograph is convenient, and meanwhile, the measuring error caused by the vibration of the tested object is minimized by the illumination device.

The spectrum measuring apparatus for optic fiber in electric field of the present invention is a spectrum measuring apparatus for optic fiber. The structure is that there is an optic fiber sealer on each end of the hollow optic fiber (1) with the sealer housing (3) of the sealer of the optic fiber having the shape of a glass pipe with hollow ball (4) in its center. On one end of the glass pipe is a glass window (5), the other end is sealed with encapsulating materials (7) such as indium and tin after inserted with a hollow optic fiber (1). The electrode (2) and sample filling pipe (6) are mounted on the glass ball of the sealer housing (3). The present invention can be used as a sample chamber for spectrometer with a high sensitivity and ready replacement of sample.

The invention discloses an H2S gas ultraviolet spectrum detection device and an H2S gas ultraviolet spectrum detection method. The H2S gas ultraviolet spectrum detection device comprises an ultraviolet light source, a fiber collimating system, a long-path gas absorption tank, a fiber focusing system, an ultraviolet fiber spectrometer and a computer, wherein the ultraviolet light source is used foremitting ultraviolet light; the fiber collimating system is used for collimating the ultraviolet light and then enabling the ultraviolet light to enter the long-path gas absorption tank; the long-path gas absorption tank is used for reflating the incoming ultraviolet light for many times, then focusing the ultraviolet light to fiber by the fiber focusing system and transmitting the ultraviolet light to the ultraviolet fiber spectrometer by the fiber; the computer is used for receiving spectral data and calculating and storing the data. The H2S gas ultraviolet spectrum detection device combines an ultraviolet differential absorption spectrum detection technology and the long-path gas absorption tank for performing real-time online detection on H2S during oil exploration, power monitoring or environmental monitoring; the H2S gas ultraviolet spectrum detection method has the characteristics of high measurement accuracy, good stability, a simple structure, high integration, low cost and the like; the safe progression of construction can be promoted and thus the exploration and development benefits are increased.

The invention provides a device for testing the color rendering performance of an eye ground laser therapeutic instrument lighting system, and mainly aims to solve the problems that in the prior art, when the color rendering performance of the eye ground laser therapeutic instrument lighting system is tested, steps are complex and efficiency is low. The device is characterized in that a laser therapeutic instrument lighting system simple assembly is fixedly connected with a CCD image acquisition assembly or a fiber optical spectrometer acquisition and processing assembly, optical filters comprise the first optical filter and the second optical filter, the first optical filter is located between a right angle reflecting prism and a slit lamp microscope objective lens and perpendicular to the direction of the slit lamp microscope objective lens, and the second optical filter is arranged between the right angle reflecting prism and a model eye device. The slit lamp microscope objective lens, the first optical filter, the right angle reflecting prism, the second optical filter and the model eye device are located in a same optical path. The device for testing the color rendering performance of the eye ground laser therapeutic instrument lighting system can qualitatively and quantitatively test the color rendering performance of the eye ground laser therapeutic instrument lighting system respectively, and the system is simple and compact in structure and convenient and quick to assemble.