351 results about "Laser raman" patented technology

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.

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 provides a method for simultaneously measuring the laser absorptivity and thermal conductivity of a single micro-nano wire rod, belonging to the technical field of characterization of property of nano-materials. The method disclosed herein is characterized by using contactless laser Raman measurement technology to position and carry out temperature calibration on the single micro-nano wire rod; then respectively using laser heating and electric heating methods in a vacuum environment to reach equal core temperature of samples to be measured and measure respective heating power; substituting the geometry size, core temperature and heating power of the micro-nano wire rod in a theoretical formula to simultaneously calculate the laser absorptivity and thermal conductivity of the samples to be measured. According to the invention, the method has the advantages of wide range of application, simple principle and convenient operation, is suitable for various micro-nano wire rods which have characteristic Raman spectrum and have different materials, diameters and lengths, fills the technical gap of measuring the laser absorptivity of the single micro-nano wire rod, and provides valuable basic physical property data for practical engineering application.

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 relates to an optic travelling wave cavity enhanced laser raman gas concentration detection device. The device combines a cavity enhanced technology with a laser raman detection technology, and utilizes an optic traveling wave passive cavity; a single curved-surface annular internal reflector forms a high-fineness cavity, and a laser outgoing beam oblique incidence cavity enhanced principle is utilized, so that laser beam is reflected in the cavity for many times and is propagated in a travelling wave manner, the laser beam passes through gas to be detected in an area to generate raman scattering, raman scattered light is collected by a photoelectric detection component after being gathered with the laser beam through a filter plate, and the photoelectric detection component detects the raman frequency shift and the corresponding raman peak intensity of the characteristics of the gas to be detected to obtain the concentration of the gas to be detected. The detection device disclosed by the invention has the characteristics of simple structure, low requirements on mechanical location, good stability and high reliability; meanwhile, the anti-jamming performance of the detection device is improved; the detection device can measure on line in real time to increase the dynamic information of the process and can detect the concentration of nearly all gas, except inert gas; the sensitivity is high; the response speed is high and the response time is short.

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 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 discloses a method for detecting microcystin in water. The method comprises the following steps of: (1) preparing magnetic particles connected with monoclonal antibodies of microcystin; (2) preparing a Raman probe connected with microcystin molecules by Raman enhancement of silver nano particles on micromolecules; (3) drawing a standard detection curve of the microcystin under the determined optimum reaction condition; and (4) determining the concentration of a sample to be determined by comparing detected peak intensity of a specified peak of a Raman spectrum of the sample and the standard curve. In the detection process, laser Raman enhancement and competition immunity are combined, and magnetic separation is applied; and compared with the conventional detection method, the method for detecting the microcystin in water greatly shortens detection time. The method for detecting the microcystin in water can also be used for detecting other kinds of microcystin molecules and small molecules, and a quick and convenient detection way is provided with pollutant in water.

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 provides a sealed sample cell for Raman spectrum measurement of high-temperature volatile molten salt and a use method thereof. The sample cell comprises a platinum crucible, a crucible cover, a hearth, a hearth cover and heating platinum wires. The use method is characterized by adopting high-temperature alumina cement to seal the gap between the crucible cover and the mouth of the platinum crucible after feeding samples to be analyzed into the platinum crucible; during measurement, providing current for the heating platinum wires to heat the samples to be analyzed to the measurement temperature, adopting a thermocouple to measure the temperature of the platinum crucible; using the sample cell by matching an upper laser inlet type micros laser Raman spectrometer. The sealed sample cell of the invention can be used for Raman spectrum analysis of the high-temperature volatile molten salt such as cryolite and NaF-AlF3 molten salt with different mol ratios. The use method of the invention can avoid the ingredients of the molten salt to be measured from being affected by escape of the volatile substances, thus improving the measurement precision of the Raman spectrum.

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.

Belonging to the technical field of laser Raman detection, the invention in particular relates to a flower-shaped silver@graphene oxide@gold nanostar core-shell structure composite particle SERS active substrate and a preparation method thereof. The core-shell structure composite particle is composed of a core layer of a single grain flower-shaped silver particle, a middle coating layer of graphene oxide and an outermost layer of a gold nanostar particle. The core-shell structure composite particle serves as the SERS active substrate. Being visible under an optical microscope, the SERS active substrate can be used for high efficiency single particle SERS detection. According to the invention, gold nanostar particles and flower-shaped silver particles are combined for the first time, the excellent surface plasma resonance coupling effect between gold nanostar and flower-shaped silver particles endows the substrate with more excellent surface enhanced raman scattering effect than monolayer particles.

The invention discloses a deep space exploration microdomain self-adaption raman fluorescence imaging combined system. The system is composed of a main controller, a spectrometer, an optical fiber, athree-dimensional motor driver, a three-dimensional precise electric platform and an optical head. The space exploration microdomain self-adaption raman fluorescence imaging combined system disclosedby the invention has the beneficial effects that the self-adaption raman fluorescence imaging combined system can adjust the diameter of a focusing spot in a self-adaption mode in microdomain analysis; a domain average grey degree of an electronic microscope is used as a scanning imaging point intensity and can meet requirements of self focusing and wide-spectrum scanning imaging at the same time;three-dimensional space initiative laser raman, hyperspectral fluorescence and visible wide-spectrum scanning imaging can be achieved at the same time; varieties of information is provided for performing microdomain analysis.

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 method for discriminating textile fibers, which is based on Raman spectra quantitative. The invention comprises using a raman spectrometer to obtain directly a laser Raman spectrogram of testing textile material, then correcting the Raman spectrogram of the testing textile material in baseline, eliminating a fluorescent background, finally normalizing the Raman spectrogram to a maximum value after baseline correction, obtaining a characteristic peak of the testing textile material, discriminating testing textile fiber according to position and strength of the characteristic peak. The discriminating method belongs to absolute optical methods, needing samples are few, samples need no pre-treatments, testing time is short, testing result is accurate, testing process produces no damages to the sample, and chemical pollution won't be produced. The invention is applicable to fiber qualitative discriminations of various textile materials.

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.

The present invention provides a industrial performance distinguishing method for natural quartz, which aims at using the natural quartz to produce high purity quartz glass. The present invention provides a set of distinguishing methods and guidelines to fill up the blank of the natural quartz industrial performance distinguishing currently. The type of ore or the impure minerals in quartz, the size of quartz mineral grain and the type, the size and the abundance of the fluid inclusion in the quartz are distinguished through a microscope and an electron probe. The homogenization temperature and the shock temperature of the fluid inclusion are determined by a microscope heating table. The gas components in the inclusion are determined through a laser Raman microprobe. The water content in the quartz is determined by using a diffuse reflectance FTOR spectroscopy. The formation cause of a quartz mineral deposit is ensured by combing the methods and the geological characteristics of the mineral deposit. A quartz quality data base is established. A natural quartz industrial performance distinguishing guideline system is established by comparing the element characteristics of the quartz mineral. The potential value of quartz resource is fully exploited through discriminating the raw materials of the high quality quartz glass.