116 results about "Plasma radiation" patented technology

Plasma discharge sources for generating emissions in the VUV, EUV and X-ray spectral regions. Embodiments can include running a current through liquid jet streams within space to initiate plasma discharges. Additional embodiments can include liquid droplets within the space to initiate plasma discharges. One embodiment can form a substantially cylindrical plasma sheath. Another embodiment can form a substantially conical plasma sheath. Another embodiment can form bright spherical light emission from a cross-over of linear expanding plasmas. All the embodiments can generate light emitting plasmas within a space by applying voltage to electrodes adjacent to the space. All the radiative emissions are characteristic of the materials comprising the liquid jet streams or liquid droplets.

The object of a plasma radiation source is to ensure a more effective protection against debris and, in particular, to counteract secondary sputtering. A target flow that is provided by a target generator by means of a target nozzle and a plasma that is generated by a pulsed excitation beam are enclosed within a vacuum chamber by a gas flow directed transverse to the optical axis.

The present invention proposes one kind of 3D real-time monitoring device for laser welding and cutting process. The 3D real-time monitoring device can acquire the coaxial infrared waveband and plasma radiation light signal for real-time quality monitoring. Compared with available technology acquiring only one kind of radiation light information, the present invention has the advantage of providing more precise information for the closed-loop control of 3D laser processing.

Provided is a method for measuring temperature of long-gap air arc plasma, relating to heat plasma temperature measurement field. The method is based upon spectrum diagnosis principle of air arc plasma radiation, shooting long-gap air arc image through an attachment double-narrow-band-pass filter and a calibrated color CCD high speed image acquisition system, and storing in BMP format which data is not compressed; correcting pixel value of arc color bitmap file responded with two feature center wavelengths to original data of arc radiation intensity; obtaining arc radial light intensity distribution through Abel transformation, then calculating arc plasma projection temperature distribution or arc plasma temperature radial distribution by a colorimetry of spectrum relative intensity, and rebuilding tridimensional temperature field. The method of the present invention can measure open arc plasma temperature in air of several meters accurately and provides an important plasma parameter for researching microcosmic mechanism of long-gap air arc.

A handheld LIBS spectrometer system features an optics stage moveable with respect to a housing and including a laser focusing lens. A laser source is mounted in the housing for directing a laser beam to a sample via the laser focusing lens. A detection fiber is mounted in the housing and is fixed relative thereto. A first mirror is fixed relative to the housing and includes an aperture for the laser beam. This mirror is oriented to re-direct plasma radiation for delivery to the detection fiber. A controller subsystem is responsive to the output of a spectrometer subsystem and is configured to control the laser source and the optics stage.

The invention relates to a method for applying edge strips (edge tape) onto narrow surfaces (narrow sides) of plate-shaped work pieces (material parts) by joining, wherein the edge strip is applied with a glue that can be activated by heat and is heated by plasma radiation. The invention further relates to the materials to which edge strips have been applied obtained in said way and to a device for carrying out said method.

The invention relates to light sources with laser pumping and to methods for generating radiation with a high luminance in the ultraviolet (UV) and visible spectral ranges. The technical result of the invention includes extending the functional possibilities of a light source with laser pumping by virtue of increasing the luminance, increasing the coefficient of absorption of the laser radiation by a plasma, and significantly reducing the numerical aperture of a divergent laser beam which is to be occluded and which is passing through the plasma. The device comprises a chamber containing a gas, a laser producing a laser beam, an optical element, a region of radiating plasma produced in the chamber by the focused laser beam, an occluder, which is mounted on the axis of the divergent laser beam on the second side of the chamber and an optical system for collecting plasma radiation.

The invention belongs to the technical field of measurement and relates to a method for measuring a temperature field in a laser welding process. In the laser welding process, a fusion line of a welding joint section and a represented temperature value (a material melting point temperature value) during metal welding are utilized, so that a method for measuring the temperature field in the laser welding process is designed, the thermal imagery and temperature field obtained by utilizing the conventional thermal infrared imager and software processing system thereof are accurately calibrated, and the important problems that the result of the temperature field obtained by the conventional thermal infrared image system has a large error compared with the actual result and an accurate calibration is absent because of the influence of essential factors such as metal steam / plasma radiation, fast temperature change and the like during the current laser welding are solved. The obstacle in the process of measuring the laser welding temperature field by utilizing the thermal infrared imager at present is offset, and a way is provided for accurately measuring the temperature field distribution of a fusion zone and a thermal influence area in the laser welding process.

This device comprises a pulsed laser source (6), means (8, 10, 12) for focusing light from this source onto an object to be analysed (2) to produce plasma on the surface of the object, means (16, 18) of analyzing a plasma radiation spectrum, means (20) of determining the elementary composition of the object from this analysis, and possibly means (4) for displacing the object. The invention is particularly applicable to test radioactive materials.

The invention belongs to the technical field of gas permeable membrane separation and in particular relates to a PDMS (Polydimethylsiloxane)-PVDF (Polyvinylidene Fluoride) composite membrane for separating organic vapor and a modification-preparation method thereof. The modification-preparation method of the PDMS-PVDF composite membrane comprises the following steps of: firstly, carrying out surface pre-treatment onto a PVDF supporting bottom membrane; then, soaking the pre-treated bottom membrane into a toluene solution of PDMS; placing the soaked bottom membrane in a plasma modification reaction device, carrying out plasma radiation and taking out after a certain time; finally, coating the prepared PDMS membrane casting solution on the treated PVDF bottom membrane, and cross-linking and curing at different temperatures to obtain the treated PDMS-PVDF compsosite separating membrane. The PDMS-PVDF composite membrane obtained by modification in the invention is compact and free of defects; the bonding strength of the PDMS separating layer and the PVDF is remarkably improved and a hole leakage phenomenon is effectively prevented. The PDMS-PVDF composite membrane obtained by modification is used for separating a propane-nitrogen gas system, so that the total flux reaches 1.93*10<-2>cm<3> / cm<2>.s, and the separating factor reaches 25.1.

The present invention relates to microwave plasma chemical vapor deposition process of oriented diamond film on alumina ceramic. The technological process includes the following steps: implanting carbon ion to alumina ceramic before deposition; microwave plasma high-temperature annealing of the alumina ceramic under mixed nitrogen and hydrogen atmosphere; and the oriented deposition of diamond film on the alumina ceramic. During the oriented deposition, the alumina ceramic is set inside the quartz tube reactor with microwave plasma radiation, the reactor is vacuum pumped, inflated with mixed gas of hydrogen and methane, and diamond film of oriented crystal grains is formed through vapor deposition under specific technological condition.

The invention discloses a multi-mode fiber LIBS detector based on a composite constraint enhanced spectrum. The multi-mode fiber LIBS detector comprises a LIBS probe, a coupling collection system, anda control detection system, wherein the LIBS probe is composed of a fiber coupling head and a focusing chamber; the coupling collection system comprises a dichroscope, a fiber focusing device, and afiber collector; and the control detection system comprises a nanosecond laser, a spectrometer, a programmable pulse delay generator, an ICCD, and a computer. The multi-mode fiber is taken as a transmission medium, laser is focused to the surface of a to-be-measured sample to break induced plasma according to a convex lens imaging rule, and the element spectrum intensity is increased by a composite constraint enhanced plasma radiation method. The detector can realize simultaneous analysis of a plurality of elements, has the advantages of safe and reliable operation, high sensitivity, high measurement precision, high spectral signal-to-noise ratio, low element detecting limit, fast analysis speed, and high efficiency, realizes remote on-line monitoring, and can effectively satisfy the disadvantages of the traditional fiber LIBS detectors.

The invention discloses a carbon / silicon carbide coaxial fiber which is prepared according to the following steps: fully mixing carbon fibers, silicon powder and silicon dioxide powder to obtain a mixture; arranging in vacuum or at a normal-pressure protection condition of an inertia gas; and heating the mixture by microwave to activate the surfaces of the carbon fibers and trigger a high-temperature reaction to obtain the carbon / silicon carbide coaxial fiber. The preparation method can be used for simply, conveniently, rapidly and efficiently preparing the C / SiC coaxial fiber which is ideal in structure and excellent in oxidation resistance. The C / SiC coaxial fiber is uniform, pure, free of impurities and controllable in shape. Besides, by adopting a technology in which the microwave is used for inducing plasma radiation, the preparation method has the advantages of high heating speed, uniform heating, small thermal inertia, short production period and the like, and the preparation cost is further lowered.

A plasma radiation source is improved in such a way that the lifetime of the optics which is limited by the influence of debris is appreciably increased. A gas curtain through which the radiation proceeding from a source region in a vacuum chamber is emitted at a defined solid angle for debris suppression along an axis of the mean propagation direction of the radiation exits as a radially directed supersonic gas jet from a propulsion nozzle of a gas jet vacuum pump, which propulsion nozzle is arranged on the axis. The gas curtain is directed to an annular mixing nozzle that is arranged coaxial to the axis and is guided out of the vacuum chamber by a diffuser. This makes it possible to use source arrangements having an optimal conversion efficiency but extensive debris.

The invention relates to a method and a device for online detecting element components of a liquid sample. The device is characterized in that the liquid sample is injected into a sample feeding tank(2) by a creepage pump (1); the sample flows through a water storage tank (3) above a microporous spraying sheet (5), and one part of liquid sample is sprayed out via spraying holes (6) in the microporous spraying sheet (5) under the high-frequency vibration function of liquid tension and a piezoelectric ceramic sheet (7), so as to form dense liquid droplets which can move at high speed; the liquid droplet sample is maintained in a stable cylinder way by a fan (10) and a flow guide and air exhaust pipe (8); a laser pulse which is transmitted by a laser device (11) is focused by a focusing lensgroup (12), and breaks down the dense liquid droplets to produce plasma; a plasma radiation signal is collected by a lens group (13), an optical fiber (14) and a spectrometer (15); the element components of the sample are analyzed according to the obtained spectrum signal. The device and the method can be applied to the high-precision detection in the fields of ocean, chemical engineering, foods,medicines, science and research, water pollution and the like.

The invention provides a method for preparing sheet-shaped nanometer Mg(OH)2 by using electrolyte diaphragm discharge plasma, and belongs to the technical field of preparation of nanometer materials. With a magnesium piece as an anode and a carbon rod as a cathode, instant high temperature and local high pressure are generated along with luminescence and shock waves in liquid by using an electrolyte diaphragm discharge plasma radiation principle; meanwhile, such high-activity particles as HO-, H-, O-, HO2- and H2O2 are generated; and the active particles can trigger multiple chemical reactions to accelerate such reactions as oxidation, reduction, decomposition and hydrolysis to prepare nanometer particles. The method for preparing the sheet-shaped nanometer Mg(OH)2 by using the electrolyte discharge plasma of a sacrificial anode has the advantages of simple equipment, easy operation, mild conditions (wherein room temperature is provided and other gas is not required for protection) and controllable process (wherein, by changing such parameters as electrolyte concentration, voltage or current magnitude and electrifying time, the sheet-shaped nanometer Mg(OH)2 with different structures and different particle sizes can be acquired), and is a new environment-friendly green preparation technology of sheet-shaped nanometer Mg(OH)2.

The invention relates to a method for applying edge strips (edge tape) onto narrow surfaces (narrow sides) of plate-shaped work pieces (material parts) by joining, wherein the edge strip is applied with a glue that can be activated by heat and is heated by plasma radiation. The invention further relates to the materials to which edge strips have been applied obtained in said way and to a device for carrying out said method.

A main object of the present invention is to provide a high quality pattern formed body, wherein only the target region is made liquid repellent with a high precision at the time of forming a pattern made of a lyophilic region and a liquid repellent region by use of plasma radiating; and a method for manufacturing the same. To achieve the object, the present invention provides a method for manufacturing a pattern formed body comprising a plasma radiating step of radiating plasma to a patterning substrate having: a base material; a photocatalyst containing layer formed on the base material and containing at least a photocatalyst; and a resin layer formed in a pattern form on the photocatalyst containing layer and containing at least a resin, wherein a fluorine compound is used as an introduction gas to radiate the plasma to make the upper face of the resin layer liquid repellent.

The invention relates to a production method of a fluoride-free waterproof woven fabric. The production method comprises the following processes in sequence: (a) pre-treatment process; (b) dyeing process; (c) cleaning process; (d) plasma process; and (e) fluoride-free waterproof heat setting process. The production method is characterized in that plasma beams emitted by a plasma generator are utilized to irradiate the woven fabric to ensure that a concave-convex coarse structure is formed on the surface of the treated fabric and then fluoride-free finishing liquid is padded on the coarse surface of the fabric. The coarse structure on the surface of the plasma irradiated fabric can form a lotus effect so as to enhance the water repellency of the fabric. Meanwhile, after the plasma irradiation, reactive free radicals can be generated on the fiber surface so that the combination of the subsequent fluoride-free waterproof finishing agent and the fiber surface is steady and the fabric still has water repellency after repeated washing. According to the production method, the technical problems of low water repellency and washing intolerance in present fluoride-free waterproof finishing are solved.

Provided is a method for forming a diamond-like carbon (DLC) film capable of enhancing the adhesion strength of a diamond-like carbon (DLC) film by simple steps. A surface of a substrate 11 made of polytetrafluoroethylene (PTFE) is modified by plasma radiation, and a diamond-like carbon film 12 is formed on the modified PTFE substrate 11 surface by chemical vapor deposition.

The invention relates to a twin-lens based LIBS system for trace heavy metal detection. The twin-lens based LIBS system for the trace heavy metal detection comprises a sample table, a laser device, a focusing lens assembly, an optical fiber, a multi-channel spectrograph and a data processor. The focusing lens assembly is used for focusing plasma radiation light produced after a sample to be detected is subjected to laser radiation and obtaining the focused plasma radiation light so as to enable the multi-channel spectrograph to obtain spectroscopic data of the sample to be detected through the optical fiber and enable the data processor to determine the heavy metal content of the sample to be detected according to the spectroscopic data. The radiation light collecting efficiency is improved, further the detection accuracy, stability and practicability of the system are improved and an LIBS technology is further developed and applied by arranging the focusing lens assembly with the numerical aperture greater than that of the optical fiber on a plasma radiation light collecting optical path.

The invention provides a jeans garment shaping liquid as well as a preparation method and an application thereof in an ultraviolet light photocatalytic shaping and finishing method and relates to a jeans garment shaping liquid. The jeans garment shaping liquid comprises the following components in percentage by weight: 5.0-15.0 percent of polycarboxylic acid, 3.0-9.0 percent of sodium hypophosphite, 0.1-2.0 percent of Fe<3+>doped nanometer titanium dioxide, 1.0-5.0 percent of penetrating agents, 2.0-5.0 percent of formaldehyde-free environmentally-friendly stiffening agents, 3.0-5.0 percent of smooth brighteners and 59.0-85.9 percent of water. The invention also relates to the jeans garment ultraviolet light photocatalytic shaping and finishing method by adopting the shaping liquid, which comprises the following steps of: carrying out plasma radiation treatment on a part of a jeans garment required to be shaped, spraying the shaping liquid onto the treated part of the jeans garment, pre-drying on a drying tunnel-type drying oven and crinkling the treated part of the jeans garment; then carrying out photocatalytic shaping on the treated parts; and finally washing and drying. The method is high in catalytic efficiency, is environmental-friendly and energy-saving and is high in production efficiency. The finished jeans garment is durable, is good in shaping effect and good in handfeel and gloss, is environmental-friendly and generates no formaldehyde emission.

The invention discloses an electrochromic nanometer cellulose composite material and a method for preparing the same, and belongs to the technical field of intelligent materials. The electrochromic nanometer cellulose composite material comprises nanometer celluloses, polyethylene glycol and aniline. N, N-dimethylacetamide is used as a solvent. The method includes steps of (1), dissolving raw materials in the solvent at the temperature of 70-80 DEG C for 1-4 h according to proportions to obtain mixed solution of the nanometer celluloses; (2), evaporating the mixed solution of the nanometer celluloses under a vacuum condition at the temperature of 60-70 DEG C to obtain nanometer cellulose films; (3), carrying out plasma radiation on the nanometer cellulose films under the protection of inert gas to obtain a polyaniline nanometer cellulose composite material; (4), soaking the polyaniline nanometer cellulose composite material in sulfuric acid and washing and drying the polyaniline nanometer cellulose composite material to obtain the electrochromic nanometer cellulose composite material. The electrochromic nanometer cellulose composite material and the method have the advantages that the method is simple, and the method and the electrochromic nanometer cellulose composite material are little in environmental pollution and have huge application prospects.

The invention provides a detection method and system for a high-speed near-space aerocraft. A signal produced in a physical process in a plasma sheath produced by the aerocraft self is used for detecting the aerocraft, and the method comprises the following steps: acquiring electromagnetic wave of plasma radiation for the high-speed near-space aerocraft; acquiring flight characteristics of the high-speed near-space aerocraft according to the electromagnetic characteristics carried by the electromagnetic wave of the plasma radiation, wherein the electromagnetic characteristics comprise one or combination of the frequency, delay and doppler information, and the flight characteristics comprise one or combination of the distance, the azimuth angle, the altitude angle and the speed. By applyingthe technical scheme disclosed by the invention, the effective detection of the near-space aerocraft can be realized.

The invention discloses a highly-sensitive rapid detection device for elements in liquid. The highly-sensitive rapid detection device comprises a YAG (yttrium-aluminum-garnet) laser, a focusing lens, optical fibers, a spectrograph, a trigger and a computer. The highly-sensitive rapid detection device for the elements in the liquid is characterized by being internally provided with a system composed of a vacuum cavity body and a pulse sampling device, and the vacuum cavity body and the pulse sampling device are connected through a guide tube. The device has obvious characteristics that liquid column samples with different diameters are rapidly detected in a vacuum environment, on one hand, the limit of ambient gas to plasma expansion and interference of an air background spectrum to a plasma spectrum are reduced in the vacuum environment, on the other hand, the liquid is excited by lasers in a form of a thin liquid column, so as to overcome negative effects of liquid level fluctuation and atomic radiation quenching and facilitate the laser induction to generate strong and stable plasma radiation, and additionally, the controllable pulse liquid column samples are adopted, so that the detection stability can be improved and the sample consumption can be reduced.

The light source contains a gas filled chamber with a region of radiating plasma sustained by a focused beam of a CW laser. The means for plasma ignition is a pulsed laser system generating a first and a second laser beams focused in the chamber. The first laser beam provides the optical breakdown, after which the second laser beam ignites the plasma, whose volume and density are sufficient for stationary plasma sustenance by CW laser after finishing the second laser pulse. Preferably, the first laser beam is generated in Q-switching mode and the second laser beam is generated in free-running mode. The technical result consists in ensuring high reliability of igniting the plasma, in creating in this basis electrodeless high-brightness broadband light sources with the high spatial and power stability, and in providing an ability to collect broadband plasma radiation in a spatial angle of more than 9 sr.