270 results about "Laser raman spectroscopy" patented technology

A Raman spectrometer that employs a time-gated single photon avalanche diode array as a sensor is described. The spectrometer can also perform fluorescence spectroscopy and laser induced breakdown spectroscopy (LIBS). A laser is used to provide an excitation signal to excite a specimen of interest. A spectrometer is used to separate the various intensities over a range of wavelengths, which are then caused to impinge on the array to be recorded. The time-gated single photon avalanche diode array is triggered in synchrony with the excitation signal so as to allow time resolution of the response of the sample of interest to the excitation. The array can be time-gated to resolve signals that have shorter durations as a function of time while excluding signals that have a longer time duration. Raman and LIBS signals can be observed even from specimens that fluoresce strongly.

The invention relates to an orderly controllable surface-reinforced Raman scattering active substrate and a preparation method thereof, and belongs to the technical field of laser-Raman spectrum detection. The substrate has a structure of a periodical hexagonal plum-blossom silver nano island, wherein the silver nano island is semispherical; the diameter of the silver nano island is approximately between 45 and 55 nanometers; and the central aperture of each hexagonal plum-blossom structure is adjustable within the spacing approximately between 10 and 90 nanometers. The method for preparing the surface-reinforced Raman scattering substrate with the orderly and controllable silver nano island structure comprises: preparing a porous alumina template; and utilizing magnetron sputtering to spray silver on the surface of the template to obtain the reinforced substrate. The substrate has the advantages of high surface-reinforced Raman scattering effect, orderly and controllable structure, good repeatability, high stability, low technical cost, simple operation and the like.

A silica glass crucible 1 having alpha of 0.05 or less over a thickness of 0.5 mm or more from the inner surface of the silica glass crucible, alpha being obtained by dividing the fluorescent intensity integrated over a wavelength range of 4,000 cm<-1 >and 4,100 cm<-1 >by the fluorescent intensity integrated at a wavelength of 800 cm<-1 >where an SiO peak appears as determined by subjecting a section of the thickness of the silica glass crucible to laser Raman spectroscopy involving excitation by laser beam of 514 nm, and an OH group concentration of 100 ppm or less over the entire periphery beyond a thickness of at least 1.0 mm from the inner surface of the silica glass crucible. A process for the preparation of a silica glass crucible for withdrawing single silicon crystal which comprises supplying helium gas or argon gas at least into the interior of the crucible-shaped molded product, and then initiating or continuing arc fusion before the termination of which the supply of argon gas is suspended or the supplied amount of argon gas is reduced and the supply of hydrogen gas is initiated.

An apparatus for in vivo, endoscopic laser Raman spectroscopy probe and methods for its use are described. The probe comprises a fiber bundle assemble small enough to fit through an endoscope instrument channel, a novel combination of special coatings to the fiber bundle assembly, including a short-pass filter on the illumination fiber and a long-pass filter on the collection fiber bundle, a novel filter adapter comprising collimating lenses, focusing lenses, a band-pass filter, and a notch filter, and a round-to-parabolic linear array fiber bundle. The apparatus further comprises a laser to deliver illumination light and a spectrometer to analyze Raman-scattered light from a sample. The analysis of Raman spectra from in vivo measurements can discover molecular and structural changes associated with neoplastic transformations and lead to early diagnosis and treatment of cancer.

The invention relates to a surface-enhanced Raman scattering nanometer porous metal substrate and a preparation method thereof, which belong to the field of laser Raman spectral detection technology. The nanometer porous metal substrate has a three-dimensional irregular through-hole structure with a spherical cavity with a diameter about 80 to 500 nm and a granular protrusion structure with a size of 5 to 20 nm on the inner wall of the cavity. The preparation method of the template of the nanometer porous metal substrate comprises the following steps of: suspension and dispersion of a spherical template agent; preparation and thermal-treatment of the template; electro-deposition to fill metal in the template; and removing the template to obtain the nanometer porous metal substrate. The substrate obtained by the invention has excellent surface enhanced effect, high repeatability, good substrate stability, lower technical cost and convenient operation control, and can be stored in the air for above two months.

Disclosed is a mixed carbon material for use in an electrode of a non-aqueous secondary battery showing excellent characteristics having rapid charge-discharge characteristics and high cycle characteristics. More particularly, disclosed is a negative electrode material for non-aqueous electrolyte secondary battery comprising the following carbon material A and carbon material B, wherein the carbon material A is a multilayer-structured carbon material which contains graphite particles and amorphous carbon covering the surfaces of the particles, and in which a 002 plane spacing (d002) measured by X-ray wide angle diffraction is 3.37Angstrom or less, Lc is 900Angstrom or more, a tap density is 0.8 g / cm<3> or more, and a Raman R value, which is the ratio of a peak intensity at around 1360 cm<-1> to a peak intensity at around 1580 cm<-1> in an argon ion laser Raman spectrum, is 0.25 to 0.6; and the carbon material B is graphite particles in which a 002 plane spacing (d002) measured by X-ray wide angle diffraction is 3.37Angstrom or less, Lc is 900Angstrom or more, a tap density is 0.8 g / cm<3> or more, a Raman R value, which is the ratio of a peak intensity at around 1360 cm<-1> to a peak intensity at around 1580 cm<-1> in an argon ion laser Raman spectrum, is 0.2 to 0.5, and an average circularity measured by a flow-type particle analyzer is 0.9 or more.

The invention relates to an underwater spectrographic detection device combining a laser raman spectrum with a laser induced breakdown spectrum. The device comprises a raman host chamber with a window and an LIBS external hanging chamber which has a window and is connected by cables and an LIBS signal transmission front-end fiber (5), and can realize detection of underwater cation and anion at the same time. The raman host chamber is equipped with a continuous laser, a front optical circuit, a spectrograph, a detector and a power supply / control communication module which are connected by the cables and an ROV deck. The LIBS external hanging chamber is internally equipped with a double impulse laser and a front optical circuit, LIBS signals enter the spectrograph through the LIBS signal transmission front-end fiber (5), a coupling device and a fiber (7), the raman signals enter the spectrograph through the raman signal transmission fiber, and multi-spectrum joint detection or single spectrum detection is realized by a set sequential control. The joint detection device has small volume and low power consumption, can be used for different marine environment measurements in submersibles, and provides a detection way capable of acquiring overall information for marine chemical detection.

Present invention discloses photons crystal optical fiber probe transducer based on nano particle surface enhancing Raman spectra belonging to laser Raman spectra detection technique. Combining photons crystal optical fiber PCF and SERS spectral technique to obtain PCF-SERS probe transducer having SERS activity, PCF-SERS probe covered with cycle arranged airport, the inner wall of central light guiding air core on PCF-SERS probe end having SERS activity nano metal granule. Said invention can be used in gas and liquid molecule detection with low background noise and high sensitivity, and making exciting light and SERS signal light existing steady mode field in PCF to realize very transmission loss, thereby suitable for on line analysis, real-time analysis, living body analysis, and in situ detecting etc.

The invention discloses a silver nanometer column array erected on the orifice of a porous alumina template and a preparation method and application thereof. The silver nanometer column array is characterized in that silver nanometer columns with the heights of 30-200 nanometers and the diameters of 30-60 nanometers are sequentially hexagonally arrayed on the periphery of the orifice of the porous anodic alumina template with taper holes; and silver nanometer particles with the particle size of 5-40 nanometers are attached to the walls of the taper holes. The preparation method comprises the following steps of: firstly placing an aluminum sheet into an oxalic acid solution, and carrying out anodization at direct-current voltage for at least 2 hours; then placing into a phosphorus-chromium acid mixed solution, and soaking for at least 3 hours to obtain an intermediate product; then firstly placing the intermediate product into the oxalic acid solution, carrying out the anodization at the direct-current voltage for at least 20 seconds, then placing the intermediate product into a phosphorus acid solution, and soaking for at least 1 minute; repeating the process for at least 10 times to obtain the alumina template with the holes in the shape of the taper holes; and then placing the alumina template into an ion sputter for silver sputtering so as to prepare a target product. The silver nanometer column array disclosed by the invention can be used as an active base of surface-enhanced Raman scattering; and the content of rhodamine or tetrachlorobiphenyl which is attached to the silver nanometer column array is measured by using a laser Raman spectrometer.

The invention relates to a surface reinforced scattering active base in the filed of laser spectrum measurement, which comprises glass substrate with mercapto treatment on the surface which deposits Ag nanometer modification inlay by silver mirror reaction. The process for preparing the base comprises substrate-hydroxylating treatment; substrate mercapto treatment and substrate surface Ag nanometer modification inlay formation.

The invention belongs to the technical field of microscopicspectral imaging detection, and relates to a split pupil laser differential confocal Raman spectrum test method and device. According to the test method and device, a split pupil laser differential confocal microtechnique and a laser Raman spectrum detection technique are organically combined, precise imaging of three-dimensional geometrical positions is realized through segmentation focal spot differential detection, the optical path structure of a traditional differential confocal microscopic system is simplified, advantages of an original laser differential confocal system and a split pupil confocal system are inherited, and multi-mode switching and processing of split pupil laser differential confocal microscopic detection, laser confocal Raman spectrum detection and laser differential confocal Raman spectrum detection can be realized only through softwareswitching processing. The test method and device provide a new technological approach for detection ofnanoscale microcell three-dimensional geometrical positions and spectrum, can be applied to fields of biomedicine, industrial precision detection and the like, and has the broad application prospect.

The invention relates to the field of Raman spectrometers, and discloses a deep ultraviolet laser Raman spectrometer which comprises a deep ultraviolet laser emitter, a reflector path, a chromatic dispersion system, a receiving system and an information processing system, wherein the deep ultraviolet laser emitter, the reflector path, the chromatic dispersion system, the receiving system and the information processing system are sequentially connected; the wavelength of a laser emitted by the deep ultraviolet laser emitter is within a range of 210-230 nanometers; an optical splitter adopted at the front end of the reflector path is a short-pass optical filter; the chromatic dispersion system is an adjustable optical filter. The deep ultraviolet laser Raman spectrometer disclosed by the invention has the characteristics of high sensitivity, large illumination point and high resolution and avoids the eyesight impairment.

A fiberscope device is disclosed which is suitable for video imaging, laser Raman spectroscopy and laser Raman spectroscopic (i.e. chemical) imaging. The fiberscope design minimizes fiber background interference arising from the laser delivery fiber optic and the coherent fiber optic light gathering bundle while maintaining high light throughput efficiency through the use of integrated spectral filters. In the fiberscope design, the laser delivery fiber optic is offset from the coherent fiber optic light gathering bundle. The laser delivery field is captured entirely by the light gathering field of view of the coherent fiber bundle. The fiberscope incorporates spectral filter optical elements that provide environmental insensitivity, particularly to temperature and moisture. The fiberscope is suited to the analysis of a wide range of condensed phase materials (solids and liquids), including the analysis of biological materials such as breast tissue lesions and arterial plaques, in such a manner to delineate abnormal from normal tissues.

The invention belongs to the technical field of laser-Raman spectrum detection appliances and Raman spectrum analysis and detection, and in particular relates to a recyclable surface-enhanced Raman-spectrum active substrate with low cost and good reproducibility, and a preparation method thereof. The substrate is characterized in that a porous titanium dioxide film is loaded on the surface of a carrier base sheet through a dipping and lifting method, and then gold nanoparticles grow on the surface of the titanium dioxide film. The composite substrate has an outstanding surface enhanced effect; and chemical compound molecules absorbed on the surface of gold in a previous Raman experiment can be effectively removed through ultraviolet irradiation, and thus the substrate can be recycled.

The electrochemical device of the present invention comprises a positive electrode (2), a negative electrode (1), a nonaqueous electrolyte and a separator (3). The separator (3) includes a porous layer (I) composed of a microporous film composed predominantly of a thermoplastic resin and a porous layer (II) containing a filler having a heat-resistant temperature of 150° C. or higher as the main component. The negative electrode (1) contains graphite having an R value of 0.1 to 0.5 and d002 of 0.338 nm or less as a negative electrode active material, where the R value is a ratio of a peak intensity at 1360 cm−1 to a peak intensity at 1580 cm−1 in an argon ion laser Raman spectrum and the d002 is a lattice spacing between 002 planes. The ratio of the graphite to the negative electrode active material is 30 mass % or more, and the nonaqueous electrolyte contains vinyl ethylene carbonate or a derivative thereof, or a dinitrile compound or acid anhydride.

A probe of a Raman spectroscopy system has a wavelength and / or amplitude referencing system for determining a wavelength of the excitation signal. Preferably, this referencing system is near an output aperture, through which the excitation signal is transmitted to the sample. In this way, any birefringence or polarization dependent loss (PDL) that may be introduced by optical elements in the system can be compensated for since the wavelength reference system will detect the effect or impact of these elements.

The invention discloses a method for evaluating a reservoir forming control effect on natural gas by a diagenetic environment of a compact sandstone reservoir. According to the method, on the basis of comprehending a plurality of types of experiments, a regional burying thermo-evolution history is combined and the diagenetic environment is finely divided; a relation between the diagenetic environment and fluid filling is judged by using a formation sequence of a diagenetic phenomenon and a diagenetic ore and combining a covering body uniform temperature value and an organic component quantity in a laser-Raman spectrum testing result; especially, the diagenetic effect and the diagenetic environment are finely divided and are combined with a gas reservoir to be analyzed.

The invention discloses a method for rapidly detecting pigment green in tea through uisng a laser-Raman spectrum technology. The method comprises the following steps of: performing laser-Raman spectrum chart scanning on tea to be detected, and generating any one group of the following three groups of absorption peaks: (1) 2150(+ / -3)cm<-1>, 842(+ / -3)cm<-1>, (2) 1524(+ / -3)cm<-1>, 1339(+ / -3)cm<-1>, 842(+ / -3)cm<-1>, and (3) 2150(+ / -3)cm<-1>, 1524(+ / -3)cm<-1>, 1339(+ / -3)cm<-1>, 842(+ / -3)cm<-1>, so as to obtain a qualitative result of pigment green in the tea, wherein when the first group of characteristic peaks occurs, the pigment green is formed by mixing iron blue and lead chromate yellow; when the second group of characteristic peaks occurs, the pigment green is formed by mixing phthalocyanine blue and lead chromate yellow; and when the third group of characteristic peaks occurs, the pigment green is formed by mixing the iron blue, the phthalocyanine blue and the lead chromate yellow. According to the method, the existence of the pigment green in the tea can be accurately, qualitatively and quantitatively determined.

The invention provides a laser-raman spectrum gas analyzer. The laser-raman spectrum gas analyzer comprises a laser, an optical resonator, a hollow reflection pipe, a scattered light collecting device and a spectrograph. The laser emits laser beams to the optical resonator. The optical resonator is composed of optical resonator reflectors. The hollow reflection pipe is a hollow pipe containing gas to be analyzed and is placed between two of the optical resonator reflectors in the optical resonator, and the laser beams in the optical resonator enter the hollow reflection pipe from one end and are emitted out through the other end of the hollow reflection pipe. The laser beams in the optical resonator transmit in the inner wall of the hollow reflection pipe and act with the gas molecules to be analyzed in the hollow reflection pipe to produce scattered light; the scattered light is reflected by the pipe wall in the hollow reflection pipe for multiple times and then are emitted out from the two ends of the hollow reflection pipe. According to the laser-raman spectrum gas analyzer, the cavity length of the optical resonator is precisely adjusted through piezoelectric ceramics, an external incident laser beam longitudinal mode is locked, and enhanced laser beams are formed in the optical resonator; the enhancing effect is dozens of times or higher that of a pure optical resonator enhancing technology, and the sensitivity of gas detection is improved.

The invention discloses a laser Raman spectroscopy method for quickly analyzing the content of melamine in milk powder, which is carried out according to the following steps of: (1) weighing 1.0 to 2.0g of milk powder, adding 3 to 5ml of acetonitrile, oscillating, ultrasonically processing and standing, then accurately weighing supernatant, adding a protein precipitation agent to the supernatant, evenly mixing and centrifuging the mixture, accurately weighing the supernatant once more, adding n-hexane, oscillating the mixture, and obtaining subnatant which is used as the solution to be detected; (2) successively adding a surface strengthening reagent, the solution to be detected and an inorganic salt flocculant to a detection pond, evenly shaking the mixture, putting the detection pond in a laser Raman spectrograph detection room, and carrying out Raman spectrum scan in 400 to 1700 cm<-1> range to obtain a Raman spectrogram; (3) carrying out qualitative judgment; and (4) carrying out quantitative calculation. The pretreatment procedure of the measurement method of the invention is simple and quick, the recovery rate of the melamine is high, the technical problem that the treatment method of the milk powder in the prior art is not suitable for Raman spectroscopy detection is overcome, and the method is the important supplement of the traditional detection technology.

The invention relates to a method for detecting BHA (butylated hydroxyanisole) in edible oil and plastic packages by laser nanometer Raman spectroscopy. The method comprises the following steps: setting the parameters and scanning conditions of a laser Raman spectrometer, and preparing a nano-gold solution with a certain particle size; scanning a series of BHA standard solutions with a certain concentration gradient and plotting a standard curve; extracting BHA in the packaging material by an organic solvent, precipitating, filtering, concentrating, fixing volume, and the like; mixing BHA methanol solution with the prepared nano-gold colloidal solution at the ratio of 1 to 10; and adjusting pH value; and carrying out laser scanning. The method has the advantages of low detection limit, high detection speed, less consumption of analytical reagent, and low detection cost, and can achieve rapid quantitative and qualitative detection of BHA in the sample.

The invention belongs to the technical fields of laser Raman spectroscopy and trace narcotic testing, and especially relates to a high-sensitivity SERS sensor active substrate used for detecting narcotics, and a preparation method thereof. The invention provides a rapid preparation method of a nano-grade conical SERS active substrate. The nano-grade conical SERS active substrate is a precious metal nano-grade conical array structure coated on a substrate. The precious metal material is silver, copper, and / or gold. The high-sensitivity SERS sensor active substrate has surface-enhanced Raman activity, and has high repeatability. The substrate can be used for detecting trace compounds such as narcotics and explosives.

The invention discloses a preparation method for a shape-controllable silver nanosheet assembly structure array and application of the shape-controllable silver nanosheet assembly structure array. The method comprises the following steps: performing gold steaming on an inert conductive substrate, coating the inert conductive substrate with positive photoresist, and drying the positive photoresist to obtain an inert conductive substrate coated with the positive photoresist and a gold film; covering the inert conductive substrate coated with the positive photoresist and the gold film by using a photoetching plate with an ordered array transmitting pattern, exposing the inert conductive substrate under ultraviolet light, rinsing the inert conductive substrate in a developing solution, and drying the inert conductive substrate to obtain an inert conductive substrate with the ordered array transmitting pattern, the positive photoresist and the gold film; connecting the inert conductive substrate serving as a positive electrode with a copper sheet serving as a negative electrode by using a wire, placing the inert conductive substrate and the copper sheet in silver electrolyte, and standing to obtain the shape-controllable silver nanosheet assembly structure array. The shape-controllable silver nanosheet assembly structure array can be widely used as an active substrate for surface enhanced raman scattering, and a laser raman spectrometer is used for measuring a trace amount of rhodamine or tetrachlorobiphenyl attached to the shape-controllable silver nanosheet assembly structure array.

The invention belongs to the technical field of laser-Raman spectrum and trace drug detection, and in particular relates to a high-sensitivity SERS (surface enhanced Raman scattering) sensor active-substrate for drug detection and a preparation method thereof. The invention provides a SERS active-substrate, the SERS active-substrate is a precious metal nano cone array structure coated on a chip, and the precious metal material is silver and / or gold. The invention also provides a method for preparing the SERS active-substrate by using an argon ion impact method. The high-sensitivity SERS sensor active-substrate disclosed by the invention has surface enhanced Raman activity and is high in repetition rate, and can be applied to the detection of trace compounds such as drugs and explosives and the like.

The invention discloses a gold nanoparticle-silver nano-semisphere array as well as a preparation method and the application of the array. The array is an ordered array which is placed on a silver membrane of a substrate and attached with silver nano-semispheres, wherein the sphere diameter of the silver nano-semisphere is 85-95 nm; the sphere interval is less than or equal to 10 nm; the gold nanoparticles are modified on the silver nano-semispheres; the particle size of the gold nanoparticle is 5-10 nm. The preparation method comprises the following steps: sequentially performing secondary anodic oxidation, reaming treatment and silver membrane plating on one side of an aluminum sheet, so as to obtain an aluminum oxide template covered with the silver membrane on one side and collected with the silver nano-semispheres in the hole; adhering and fixing the substrate to the silver membrane; then, placing the aluminum oxide template covered with the silver membrane and the substrate on one side and collected with the silver nano-semispheres in the hole in an alkali solution to etch off the aluminum oxide template, and then putting the rest in an ion sputtering device to perform gold sputtering for 8-12 s under the sputtering current is 35-45 mA, so as to obtain the objective product. The array can be taken as an active substrate for enhancing raman scattering on the surface, so that the content of trace rhodamine or polychlorinated biphenyl 3 attached on the array can be measured by a laser raman spectrometer.

The invention discloses a gold micron feather cluster modified with silver nanoparticles and a preparation method and application thereof. The gold micron feather cluster is characterized in that the silver nanoparticles are coated on an aluminum sheet, of which the surface is provided with pit arrays, wherein the particle diameter of the silver nanoparticles is 15-25 nm, and the gold micron feather cluster has the diameter of 32-658 microns and consists of gold micron feathers which consist of gold nanoparticles with the particle diameter of 200 nm to 1 micron and have the feather rod length of 16-329 microns, the feather branch length of 8-160 microns and the small feather branch length of 2-13 microns. The method comprises the following steps of: firstly obtaining the aluminum sheet, of which the surface is provided with the pit arrays which are hexagonally arranged in an orderly manner and are bowl-shaped, by using an anodic oxidation method; carrying out gold nanoparticle ion sputtering on the aluminum sheet so as to obtain the aluminum sheet coated with the gold nanoparticles; then putting the aluminum sheet coated with the gold nanoparticles in an argon atmosphere, and annealing so as to obtain the aluminum sheet coated with the gold micron feather cluster; and carrying out silver nanoparticle ion sputtering on the aluminum sheet coated with the gold micron feather cluster, thereby producing a target product. The gold micron feather cluster modified with the silver nanoparticles can serve as a surface-enhanced Raman scattering active substrate, and the content of rhodamine or tetrachlorobiphenyl attached onto the gold micron feather cluster is measured by using a laser Raman spectrometer.

The invention discloses a laser-Raman spectrum method for rapidly detecting the content of Sudan red I in chili powder, belonging to the technical field of food safety detection. The method comprises the following steps: (1) determining a characteristic Raman peak and a peak movement range; (2) drawing a Sudan red I standard curve; (3) preparing a to-be-detected sample solution; (4) detecting the to-be-detected sample solution by a Raman spectrometer to obtain a Raman spectrum of a sample; (5) carrying out qualitative judgment: when the Raman spectrum of the sample has an obvious characteristic Raman peak, judging that the chili powder contains the Sudan red I; and (6) calculating the content of the Sudan red I in the sample according to the Sudan red I standard curve and the Raman spectrum of the normalized sample. According to the laser-Raman spectrum method, the qualification is accurate, the operation is simple, and strong professional backgrounds are not needed; readings are visual, the detection speed is high, the sensitivity is high, and the detection limit can be up to 5mg / kg-50mg / kg; and the cost is low, unqualified foods can be effectively identified, and thus the rights and interests of consumers are protected.

The invention discloses a blood identification method based on an infrared Raman super-continuum diffuse comprehensive spectrum. The blood identification method comprises the following six steps: starting an instrument, and feeding a sample for super-continuum spectrum test; performing super-continuum spectrum laser diffuse comprehensive spectrum test; feeding a sample for Raman spectrum test; performing infrared laser Raman spectrum test; analyzing and fusing data; identifying and distinguishing blood. The blood identification method has the beneficial effects that a two-in and two-out optical fiber complex spectrometer is connected by using a Y-shaped optical fiber so as to form the hardware, an infrared Raman spectrum and a super-continuum diffuse comprehensive laser spectrum are in weighted stack so as to form the software, and thus spectrum data information fusion can be achieved. Due to the hardware structure and robustness of software analysis, the blood identification method can be applied to automatic identification of whole blood, plasma and serum.