215 results about "Fiber probe" patented technology

Multi-core optical fiber probe includes a multi-core optical fiber (and method of manufacturing the probe) including a plurality of cores adjacent a cladding material, and a plurality of angled reflectors disposed at a distal end of the cores. An angled reflector of the plurality of angled reflectors deflects light propagating in the core at a deflection angle that is different from an axis of light propagation in the core. Light propagating toward a distal end of the core of the multi-core probe is emitted, after reflection by the corresponding reflector, out of the multi-core optical fiber probe.

A fluorescent fiber-optic biosensor system using ultrasonic concentration of particles and cells for the detection of Salmonella typhimurium. A biosensor test chamber serves as an ultrasonic standing-wave cell that allows microspheres or cells to be concentrated in parallel layers or in a column along the axis of the cell. A fiber probe along the axis delivers laser excitation to fluorescent-labeled antibodies of Salmonella and collects the fluorescent signal. The Salmonella-antibody complexes are moved acoustically to the axis of the cell, increasing the fluorescent signal. Alternatively, the Salmonella-labelled antibody complexes attach to unlabeled antibodies that have been immobilized on the surface of polystyrene microspheres. This entire structure can be manipulated acoustically and the increase in the fluorescent signal, which can be an order of magnitude, indicates the presence of Salmonella.

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 fiber optic probe and optical coupler assembly, and methods for making the assembly and reproducibly aligning a plurality of optical fibers therein. The coupler is used with a probe that includes a housing or probe body, a probe tip, at least one light-transmitting fiber, at least one light-receiving fiber spaced apart from the light-transmitting fiber, and (if desired), in-line devices such as filters and lenses positioned in optical communication with the fibers. The coupler includes at least one aligning pin that helps maintain the transmitting and receiving fibers in precise, reproducible relative alignment therein; thus, the coupler can be cut to install filters and other in-line devices, then readily re-assembled for use with the cut ends precisely and accurately realigned. The coupler is simple and rugged, and can be manufactured and assembled without the need for high-precision machining or optical alignment procedures.

A method for the determination of cellulosic-fibre properties, such as, but not limited to, residual lignin content of chemical pulp, with the aid of a spectroscopic technique obtained over a range covering the visible and the near-infrared regions of the electromagnetic spectrum, comprising the steps of obtaining a sample from the process line, minimally removing some excess water, exposing the fibres in the sample to a large beam light source, optionally moving the sample at a constant speed, and acquiring the spectral data over a pre-determined length of time, and correlating the spectrum to a previously determined calibration so as to determine the Kappa number. Alternatively, as an arrangement for process control, along with other varying configurations, the instant invention includes the mounting of the excitation light source and fibre-optic probe along the various locations of the kraft cooking and bleaching process, such as 1) at the drum brownstock washers and 2) throughout the bleach plant deckers, located just before the doctored blade, the probe being connected to a fast scanning spectrometer, via fibre optic cables, with a computer sequencing spectral acquisition and correlating the spectrum against a predetermined calibration, and logging the results. The process configuration, with the use of the instant invention, overcomes all limitations of prior art, including sampling hardware and sample preparation, and provides true online Kappa number determinations of the order of seconds, as compared to current state of the art Kappa analyzers which require 10 to 15 minutes per analysis. The present method is capable of measuring residual lignin content of chemical pulps with varying consistency, accounts for species effects to provide species insensitivity and can provide analysis in less than 10 seconds. The method can provide true online continuous measurement of Kappa number for feedforward and feedback control of the bleaching, paper machine and kraft cooking processes.

A fiber optic probe assembly is provided. The probe comprises a first optical system and a second optical system, a delivery light guide comprising one or more than one delivery optical fiber for transmitting excitation radiation from a radiation source disposed at a proximal end of the light guide to the first optical system. The first optical system comprising one or more than one first optical element for forming a substantially collimated illumination beam from the excitation radiation. An optically opaque tubular sleeve is fitted over the first optical system to optically isolate the first optical system and the delivery light guide from the second optical system. The second optical system comprising one or more than one second optical element for gathering optical radiation scattered from a sample and forming the optical radiation into a collection beam. A collection light guide comprising one or more than one collection optical fiber receives the collection beam and transmits the collection beam to an analyzer. The first and second optical systems are disposed within a housing so that an emission cone of the first optical system and an acceptance cone of the second optical system substantially overlap. A spectroscopic measurement system comprising the optic fiber probe is also provided.

A fiber optic probe device having a sampling end positionable over optical fibers is provided. The sleeve could be releasably attached to the fiber optic probe device. The sampling end can be discarded after use, or re-used. A sample chamber including a reflective surface can be formed at the distal end of the sampling end.

Provided is an optical fiber measurement method and device of blade tip clearance. A multipoint orientation reflecting compensation type optical fiber is adopted to carry out distance measurement; laser emitted by a laser device in a working wavelength range is transmitted to the surface of an object to be measured through a fiber probe, is reflected back to the fiber probe after being reflected through the surface of the object to be measured, and then enters multiple channels of receiving optical fibers respectively; filtering is carried out on laser entering the receiving optical fibers through optical filters, energy of laser entering the multiple channels of receiving optical fibers in the working wavelength range after the laser is reflected by the surface of the object to be measured is obtained respectively, the energy of the laser is converted into weak current signals through photoelectric detection, the weak current signals are amplified into current or voltage signals for being collected through a signal amplification filtering circuit, comparison processing is carried out by collecting the multiplexed output current signals or voltage signals, and the distance between the optical fiber probe and the object to be measured is obtained. The invention further discloses a measurement device for achieving the method.

The invention discloses human body oxidative stress non-invasive fluorescence detection device and method. An excitation light source system comprises one near ultraviolet light source and one light filter and one beam splitter which are arranged on the emergent light path of near ultraviolet light source; wherein the beam splitter splits the emergent light into a reference light and an exciting light. A spectrum acquisition system comprises a conduction optical fiber, a fiber probe and a spectrometer. The conduction optical fiber is used for transmitting the reference light to the spectrometer; the fiber probe is used for transmitting the exciting light to skin part of human body to be tested, collecting fluorescent light generated by excitation on skin of human body and transmitting the fluorescent light to the spectrometer. The spectrometer is used for analyzing and processing the collected spectrum signal and finally obtains oxidative stress status of the detected object. Autofluorescence of skin is utilized to reflect human body oxidative stress status, detection speed is rapid, and result can be displayed in real time. The invention can provide reliable basis for prevention, diagnose and treatment effect evaluation on critical illness.

The invention relates to the laser induced spectrum measuring technology, in particular to a laser induced spectrum measuring apparatus having self-adjusting calibration function and a control method.The invention solves the problem that laser focus adjustment and fiber probe alignment are difficult to realize by the prior laser induced spectrum measuring apparatus. The measuring apparatus comprises a platform for placing articles to be measured, a spectrum collecting and analyzing assembly, a computer, an assistant light source assembly, an electronic control unit, a focus adjustment assembly, an angle adjusting assembly for the fiber probe, wherein the focus adjustment assembly comprises an optical amplifying lens group, a CCD image sensor and an electric elevator mechanism; the angle adjusting assembly for the fiber probe consists of electric control rotary apparatuses arranged for each fiber probe, respectively; the assistant light source assembly comprises an electric control constant flow source, a selective transflective lens and a frequency range calibration light source. The control method comprises a focus adjustment step and an angle adjusting step for the fiber probe.The measuring apparatus has the advantages of simple structure, favorable using effect, simple and reasonable control method and realization of laser focus adjustment and fiber probe alignment with high precision.

A complete optical probe scanning near field optical microscope is disclosed, comprising laser lighting system, monitoring system, sample support, light fiber probe scanning mechanism, three-dimensional rack and pinion adjustment, feedback control and data collecting system. Its basic idea that light fiber probe is fixed on tuning fork, through three -dimensional scanner, light fiber probe is made to scan on the surface of sample nearby, when light fiber probe is approaching the surface of sample, it will be influenced by effect of atom shearing force which will change concussion of tuning fork so that the information of distance between light fiber probe and sample can be obtained. The information is feedback to Z direction control system to make light fiber probe keep a distance to a constant value with surface of sample, whose appearance will be reflected by the information feedback, and light intensity collected by light fiber probe provides permeability of sample. The invention has the advantages of large scanning range, no limitation of sample, high modularization, convenient combination and change.

The invention discloses a method for assembling precious metal nanocrystalline on the surface of conical fiber. According to the method, electrified precious metal nano particles are modified on the surface of a conical fiber probe according to an electrostatic absorption principle, and organic pollutants are detected according to an SERS (surface enhancement Raman scattering) effect. First, the positively charged or negatively charged precious metal nano particles such as gold, silver and the like as well as the fiber probe with a conical tail end are prepared, siliane coupling agents with exposed negatively charged or positively charged functional groups are modified on the surface of the conical fiber probe, the nano particles which are charged oppositely to the surface of the fiber and dispersed in a solvent are absorbed on the surface of the fiber according to the electrostatic absorption principle, accordingly, the variety, the morphology and the density of the assembled nano particles are controlled, and the taper angle of the tail end of the fiber is optimized. The method provides a new assembly concept for coupling of the nano particles and the fiber, is effective for preparation and optimization of high-performance fiber SERS probes, and lays a foundation for convenient, quick and online SERS detection of environmental pollutants.

A fiber optic sensor for detecting acceleration or displacement includes a fiber optic probe with a multimode transmitting optical fiber, a multimode receiving optical fiber and a edge reflector spaced apart from the fiber probe. The reflector moves in a transverse direction substantially normal to the longitudinal axis of the fiber optic probe, so the amount of light received by the receiving fiber indicates a relative acceleration or a relative displacement of the reflective surface with respect to the fiber probe in the transverse direction of motion of the edge of the reflector. The reflector can be mounted on a cantilever beam. The sensor can have one transmitting fiber, two receiving fiber, and a reflector with two edges, each edge partially covering one of the receiving fibers. A triaxial sensor system has at least two two-fiber sensors.

A fiber probe tip, particularly for use on a fiber-optic probe in endoscopic applications. The probe tip prevents contamination of the probe imaging elements and maintains proper distal relationships between imaging components and tissue under examination. In one embodiment, the fiber probe tip is comprised of a sheath placed over an optical fiber. The probe tip provides a sterile interface between the optical fiber and the tissue. The fiber tip probe includes an imaging element to capture reflected light from the tissue. The fiber probe tip maintains the positioning of the imaging element relative to the optical fiber to properly capture reflected light from the tissue. The fiber probe tip may also contain an optical window positioned relative to the imaging element. The optical window allows the reflected light from the tissue to pass through to the imaging element and provide an optimized focal distance between the tissue and the imaging element for the imaging technology employed.

A method of building a set of experimental prediction model that requires fewer experimental frequency, shorter prediction time and higher prediction accuracy by using the advantages of combining the experimental data of Taguchi method and neural network learning is disclosed. The error between the experimentally measured result of photolithography and the simulated result of the theoretical model of near field photolithography is set as an objective function of an inverse method for back calculating fiber probe aperture size, which is adopted in the following Taguchi experiment. The analytical result of Taguchi neural network model of the present invention proves that the Taguchi neural network model can provide more accurate prediction result than the conventional Taguchi network model, and at the same time, improve the demerit of requiring massive training examples of the conventional neural network.

The invention discloses an optical fiber sensor array, and belongs to the technical field of electromagnetic measurement and the microwave photonics. The optical fiber sensor array comprises a Kth optical switch array and a set of optical fiber sensors connected with ports of the Kth optical switch array respectively. The switch time sequence of the optical switch array is controlled, a corresponding delay scheme is combined, time division multiplexing is achieved, and the measurement data of the optical fiber sensors at the same time can be obtained in sequence. The invention further discloses an antenna pattern measuring device and measuring method. The optical fiber sensor array is used for measuring the space electric field intensity of all optical fiber probes at the same time in sequence, and therefore an antenna instant pattern can be measured. Electromagnetic interference caused by a metal probe in the traditional antenna pattern measuring process is eliminated, and spatial resolution, measurement precision and measurement speed are improved. In addition, antenna instant pattern measurement which cannot be achieved by a traditional measurement method can be achieved, and a pulse radar pattern can be measured.

The invention provides an on-line diagnosis method for defects in a laser material increasing manufacturing process on the basis of spectrum diagnosis. The method comprises the following steps: adjusting the position of a fiber probe; when a metal direct depositing system based on coaxial powder feeding begins to work, acquiring laser induced plasma spectrum signals generated in a manufacturing process by the fiber probe and feeding the spectrum signals into a computer via a fiber spectrometer; observing conditions of fluctuation of relative radiation intensities of plasmas with different wavelengths along with time in real time and determining a characteristic spectral line used as an analyzing object; filtering a characteristic spectral line relative radiation intensity time-domain figure; judging whether relative radiation intensities of the characteristics spectral line in a laser material increasing manufacturing process rapidly fluctuate or change or not on the basis of the selected characteristic spectra line time-domain figure or filtering images; if the relative radiation intensities of the characteristics spectral line in the laser material increasing manufacturing process rapidly fluctuate or change, showing that manufacturing defects exist; and if the relative radiation intensities of the characteristics spectral line in the laser material increasing manufacturing process do not rapidly fluctuate or change, showing that the manufacturing defects do not exist. By the diagnosis method, generation and appearing time of the defects in the laser material increasing manufacturing process and defect types can be judged rapidly and accurately.

The invention relates to an unicell detector based on a nano fiber probe, which comprises a nano probe, a light source unit, a micro operation system, an electricity detection unit, a cellular localization system and a photon detection unit, an innermost layer of the nano probe is a fiber layer, the outer wall of the fiber layer is wrapped with a nano ring electrode layer, and the outer wall of the nano ring electrode layer is wrapped with an insulating layer. A manufacturing method of the unicell detector based on the nano fiber probe comprises the steps of drawing, sputtering, making the insulating layer and cutting focused ion beam. The unicell detector has high sensitivity and can realize the unicell grade detection, compared with a traditional detection means by crushing millions of cells, the required cell sample amount is greatly reduced, and the success rate of disease detection at early stage can be increased. The unicell detector can perform in-vivo cell detection and can avoid the false appearance generation during a cell processing process. The space-time resolution and detectable target object scope can be greatly enhanced, and a biochemistry mechanism in the unicell enables real-time detection and analysis.

The invention provides an integrated two-dimensional fiber optic micro accelerometer based on a four-core fiber optic, which is formed by connecting light sources the wave lengths of which are 1310nm and 1550nm respectively, a wavelength division multiplexer, a circulator, a single-core fiber optic, a fiber optic sensing probe and a dual detector, wherein the fiber optic sensing probe comprises a four-core fiber optic, an external shell, mass blocks and a support, wherein each fiber core is carved with fiber optic gratings serving as reflectors; resonance wavelengths of the two orthotropic fiber optic grating pairs are 1310nm and 1550nm respectively; the single-core fiber optic and the four-core fiber optic are connected by utilizing a fiber optic coupler; the single-core fiber optic and the shell are rigidly connected; the mass blocks and the four-core fiber optic are connected and fixed; the mass blocks are fixed at the positions of the four fiber optic gratings; and the four-core fiber optic is fixed with the external shell by the support. The invention is beneficial to the miniaturization and the integration of sensors, can realize the acceleration measurement in the two-dimensional direction, has simple, convenient and feasible manufacture method and can achieve the goal of temperature compensation.

The invention relates to a method for measuring plasma electron density by fiber spectrum synergizing discharge current, and belongs to the technical field of discharge plasma diagnosis. The method is technically characterized by comprising the following steps: using a micro fiber spectrum measuring path and a discharge current measuring circuit at the same time to acquire real-time parameters of optical radiation spectrum of discharge plasma and discharge current, comprehensively analyzing the parameters through a computer data processing system, and calculating the electron density of the plasma. The micro fiber spectrum measuring path consists of a fiber probe, a conducting fiber and a micro fiber spectrometer, which are connected in turn; the discharge current measuring circuit consists of a current sensor, a current signal amplifier and a data acquisition device, which are connected in turn; and the computer data processing system calculates the electron density of the discharge plasma by using the acquired data according to the gas molecule motion theory. The method has the advantage that the application range of the discharge plasma electron density diagnosed by optical emission spectrometry is expanded to an imbalance state from a local thermal balance state.

The invention discloses a nixie tube material arrangement machine with automatic detection and direction rotating functions. The nixie tube material arrangement machine comprises a rack with a control box and a spin vibration sieve. A material arrangement disc capable of moving horizontally is arranged on the rack. Stop strips parallel to the material arrangement disc are arranged above the material arrangement disc in an up-down moving manner. Rotating devices right facing a discharging opening of the spin vibration sieve are sequentially arranged on the stop strips from one ends to the outer sides. Fiber probes are arranged above the rotating devices. According to the nixie tube material arrangement machine with the automatic detection and direction rotating functions, the decimal points of each eight-section nixie tube are detected through the fiber probes and rotated to the same direction through the rotating devices, and then the eight-section nixie tubes are arranged on the material arrangement disc neatly; no manual sorting and adjusting are needed, the whole process is completed automatically, the time and labor are saved, the detection speed is high, the arrangement efficiency is high, and the labor intensity and the labor cost are lowered greatly; and during the detection, it is not necessary to conduct rotation when the direction is right, the direction is corrected if the direction is wrong, it can be guaranteed by the detection that the eight-section nixie tubes entering the material arrangement disc are right in direction, no check is needed after arrangement, the error is avoided, and the situation that the display result is wrong after mounting is prevented effectively.

The invention relates to a metal element liquid phase cathode discharge plasma spectrum rapid detection system and a detection method thereof. The system comprises a plasma generation device, a fiber spectrometer and an ICCD camera. A needlelike platinum electrode cathode is arranged in the plasma generation device, the top of the plasma generation device is provided with an anode, the sidewall of the plasma generation device is provided with a fiber probe, and the needlelike platinum electrode cathode is respectively connected with a power supply negative electrode and an oscilloscope through two resistors; a graphite carbon rod is connected with a translation bench, a power supply positive electrode and a third resistor connected with the oscilloscope; and a condensing lens is arranged in front of the ICCD camera, and the fiber spectrometer and the ICCD camera are connected with a computer. In the detection process, voltage and current are increased, the needlelike platinum electrode cathode discharges to generate glow plasma, and the oscilloscope determines the current-voltage waveform; and the computer analyzes an optical signal to complete qualitative or quantitative detection of a metal element. The detection system uses no peristaltic pump, so loss caused by flow introduction of a sample in the determination process is avoided, and analysis detection of a trace quantity of the metal element in an environment sample is convenient.

A non-constructive detection method for dyes on textile antique comprises following steps: (1) connecting a composite light source composed of deuterium lamp and halogen tungsten lamp, a micro fiber optic spectrometer and a diffuse reflection device to a portable computer; (2) running the spectrometer software, adjusting the angle and height of the optic fiber probe and correcting the spectrometer with a standard white board; (3) putting the sample to be detected under the optic fiber probe ( the distance is about 1 cm), adjusting the integration time according to the strength of the spectral signals and obtaining a ultraviolet-visible spectrum of the dyes; (4) saving the spectrogram of the sample to be detected, comparing to a standard dye spectrogram, and identifying the sorts of the dyes. Compared to the prior art, the non-destructive detection method has the advantages that: the method is suitable for dye detection under various environments, the sorts of dyes can be identified without sampling, categories of various natural dyes can be precisely identified by the method, and the method also provides basic data for the color protection of textile antiques.

A fluorescent fiber-optic biosensor system using ultrasonic concentration of particles and cells for the detection of Salmonella typhimurium. A biosensor test chamber serves as an ultrasonic standing-wave cell that allows microspheres or cells to be concentrated in parallel layers or in a column along the axis of the cell. A fiber probe along the axis delivers laser excitation to fluorescent-labeled antibodies of Salmonella and collects the fluorescent signal. The Salmonella-antibody complexes are moved acoustically to the axis of the cell, increasing the fluorescent signal. Alternatively, the Salmonella-labelled antibody complexes attach to unlabeled antibodies that have been immobilized on the surface of polystyrene microspheres. This entire structure can be manipulated acoustically and the increase in the fluorescent signal, which can be an order of magnitude, indicates the presence of Salmonella.

The invention discloses a high-consistency photoacoustic excitation and detecting integrated fiber probe, a manufacturing method and a testing method thereof. According to the probe, a light absorbingmaterial (such as graphene or molybdenum disulfide and the like) and an elastic material (PDMS) are combined and deposited on the end surface of a double-clad fiber, and high-power pulse laser is utilized for performing photoacoustic signal excitation. Furthermore a light-absorbing sensitive material and a single-mode fiber end surface form a Fabry-Perot (F-P) interference chamber for realizing photoinduced ultrasonic signal detection. The probe has a photoacoustic excitation function and a detecting function and can be manufactured and formed in one time. Furthermore because the light absorbing material is prepared through a chemical liquid phase deposition method, the high-consistency photoacoustic excitation and detecting integrated fiber probe has advantages of controllable thickness,low number of steps, high repeatability, etc. Therefore, the fiber type photoactoustic probe has advantages of photoacoustic signal receiving-and-transmitting integration, small size, simple manufacture, high consistency, high photoacoustic conversion efficiency, high electromagnetic interference resistance, etc. The high-consistency photoacoustic excitation and detecting integrated fiber probe can be used in the fields such as industrial nondestructive detection, biomedical ultrasonic and material characteristic measurement.

The invention discloses a backward elastic scattering spectral measurement analysis system and method for online detection of size distribution of small particles in a suspension. A linear array fiber probe and an off-axis parabolic reflector are used to construct a multi-angle spectral measurement system, and a spectral analysis method based on wavelet multi-scale analysis is utilized to provide quick and accurate acquisition for the size distribution of particles. The method may be used for real-time monitoring of the production of standard particle, detection of oil-in-water pollutants, granularity detection for milk products, study on particle structure in biological cells and the like. The system is simple, and analytical results are accurate.