141 results about "Laser light scattering" patented technology

Device, method, and computer program product for determining a material parameter of a blood coagulation cascade based on parameters of light diffused at a biofluid sample. In one example, the biofluid sample includes a blood sample. Laser light scattered by the sample is collected by the optical system in reflection and/or transmission mode. An image of the sample in so collected light is formed, and data representing fluctuations of laser speckle intensity with is processed to derive numerical descriptors associated with blood coagulation and fibrinolysis. In a specific case, such numerical descriptors are derived based on temporal dynamic of a viscoelastic characteristic of the blood sample.

An electro-optic system, e.g., mounted to a weapon, measures down range winds and a range-to-target for compensating the ballistic hit point. The system may include an optical light source, collimated to generate a laser spot on the target. The system may include a wind measurement receiver that captures laser light scattered from the target. The captured light may be modulated by atmospheric scintillation eddies, producing optical patterns which change in time and move with the crosswind. These patterns may be analyzed by a processor using covariance techniques to determine path-integrated crosswinds and associated errors. Ranging is done by measuring the time of flight of the laser pulse to the target collecting the scattered signal from the target. Compensated ballistic hit point, measurement errors and other data may be displayed on a micro-display digital eyepiece, overlaid on the real-time image of the target.

An electro-optic system, e.g., mounted to a weapon, measures down range winds and a range-to-target for compensating the ballistic hit point. The system may include an optical light source, collimated to generate a laser spot on the target. The system may include a wind measurement receiver that captures laser light scattered from the target. The captured light may be modulated by atmospheric scintillation eddies, producing optical patterns which change in time and move with the crosswind. These patterns may be analyzed by a processor using covariance techniques in either the time-domain or the frequency-domain to determine path-integrated crosswinds and associated errors. Ranging is done by measuring the time of flight of the laser pulse to the target collecting the scattered signal from the target. Compensated ballistic hit point, measurement errors and other data may be displayed on a micro-display digital eyepiece, or projected onto the direct view optics (DVO) of a riflescope so as to be overlaid in real-time on the optical image of the target.

A composition for polishing a semiconductor wafer contains fumed silica particles that are produced by wet grinding using a grinding medium and that have characteristics (A) to (C):

(A) a specific surface area in the range of 50 to 200 m²/g measured by a BET method;

(B) an average particle diameter in the range of 10 to 50 nm measured by a laser light-scattering method; and

(C) an average ratio A/B of the major axis A to the minor axis B of the fumed silica particles in the range of 1.2 to 2.0 measured by TEM observation,

wherein the concentration of silica particles containing the fumed silica particles is in the range of 0.5 to 50 weight percent relative to the total weight of an aqueous dispersion.

A particle counter (10) passes a sample stream of a carrier gas or fluid containing particles (72) through an elongated, flattened nozzle (16) and into a view volume (18) formed by an intersection of the sample stream and a laser beam (13). Particles entrained in the sample stream scatter light rays while passing through the view volume. The scattered light is collected by an optical system (26) and focused on to a detector (40). The magnitude of signal coming from the detector is indicative of the particle size. To correct for variances in particle velocity and light beam intensity across the view volume, flow aperturing is used. Flow aperture modeling (Eqs. 1-7) provides a format for designing the nozzle such that the lateral velocity profile matches the laser beam lateral intensity profile, thereby providing uniform detection sensitivity to laser light scattered from monodisperse particles distributed laterally across the view volume. Uniform detection sensitivity of monodisperse particles provides accurate particle sizing resolution.

The invention provides an anode material for lithium ion secondary battery using a coated graphite powder as a raw material. The coated graphite powder is coated with carbonized material of thermoplastic resin of a carbonization yield of not more than 20 wt % in a proportion of not more than 10 parts by weight the carbonized material per 100 parts by weight graphite powder. The graphite powder as coated with thermoplastic resin increases 5% or more in accumulative pore volume of the graphite powder having a pore size of 0.012 μm to 40 μm as measured by a mercury porosimeter method, as compared with the graphite powder before coated with the thermoplastic resin. The coated graphite powder has a mesopore volume defined by IUPAC of 0.01 cc/g or less as calculated with the BJH method as viewed from desorption isotherm, which is also equal to 60% or less of the pore volume of the graphite powder before coated with the thermoplastic resin, an average particle size ranging from 10 μm to 50 μm, as measured by a laser-scattering-particle-size-distribution measuring device, and a ratio of standard deviation to the average particle size (σ/D) of 0.02 or less.

A method of monitoring a blood pressure includes: emitting a laser to a blood vessel in a body part; detecting, from the body part, laser speckles caused by scattering of the emitted laser; obtaining a bio-signal indicating a change in a volume of the blood vessel by using the detected laser speckles; and estimating a blood pressure based on the obtained bio-signal.

A detecting device and method for mass concentrations of aerosol granules are disclosed. The device includes a laser emitting laser pulses of a plurality of wavebands. The laser pulses enter air through a collimation and beam expanding system and a reflector. Laser light scattering echo signals are received by a telescope, are introduced through optical fibers into a beam splitting system, and are then subjected to signal conversion through a photoelectric detector. A data collecting system performs data collecting on the signals. Finally, data processing is performed in a computer to invert an aerosol granule mass concentration. The device and the method are based on novel theories and novel methods of granule mass concentration distribution detection by multi-waveband laser radar remote sensing, can achieve high-spatial-resolution detection of granule mass concentrations in a range of a plurality of kilometers, effectively overcome a difficulty that present granule mass concentration spatial distribution monitoring techniques are not mature, and provide air scientific research, space environment monitoring and executive decisions with scientific bases and methodologies.

The invention relates to a laser cleaning device for oxide layers on surfaces of steel plates. The laser cleaning device comprises a bearing system, a laser, multiple spectroscopes, rust removal heads, a dust removal system, a protection system and a central control system, wherein the bearing system is used for horizontally storing the steel plates and can drive the steel plates to move in the front and back direction; the laser can emit horizontal laser beams; the spectroscopes are used for splitting the horizontal laser beams and conducting downward reflection; the rust removal heads are in one-to-one correspondence with the spectroscopes, gather reflected light and then scatter the reflected light to the surfaces of the steel plates; the dust removal system is used for collecting the removed oxide layers, and the protection system is used for introducing inert gas to the surfaces of the cleaned steel plates; the central control system is used for controlling the bearing system, the laser, the dust removal system and the protection system to work. The rust removal heads are distributed in an array in the left-right direction of the steel plates, so that the whole surfaces of the steel plates are covered with the laser light scattered by the rust removal heads in the moving process. According to the laser cleaning device, the oxide layers on the surfaces of the steel plates are gasified or stripped in an ablation discrete mode through high energy of the laser light, and a non-contact, safe and environment-friendly cleaning method is provided.

The embodiment of the invention discloses a fluorescent wheel and fluorescent conversion system. The fluorescent wheel is used for receiving irradiation of a laser and comprises a fluorescent powder region and a laser diffusion region located on a reflection base plate; the fluorescent powder region is used for emitting a fluorescent light under the excitation of an incident laser and reflecting out; the laser diffusion region is used for diffusing the incident laser and reflecting out. If the fluorescent wheel is applied in the fluorescent conversion system, the fluorescent light and the laser emitted by the fluorescent wheel can be directly collected by a same light collection device; compared with the mode of respectively carrying out corresponding alignment and convergence to the fluorescent light and the laser and the design of an optical path conversion part in the prior art, the fluorescent conversion system is simplified; the integrated size is reduced; and the fluorescent conversion system is minimized.

The present invention discloses a fine particle matter measuring device for detecting the content of PM2.5 in the air, the fine particle matter measuring device includes a PM10 collector for collecting an air sample, a PM2.5 cutter for separating fine particulate matters in the air sample, a detecting device for detecting the content of the fine particulate matters in the air sample, and an air pump for stabilizing the air flow, the detecting device comprises a laser light scattering apparatus, a photoemission detector, and a signal processor, the fine particulate matter measuring device is simple, reliable, low in price , and apparatus-saving, and the present invention also discloses a measuring method using the fine particle matter measuring device.

A welding inspection method has steps of: generating transmission laser light for generating an ultrasonic wave and transmitting the transmission laser light to an object to be inspected during or after welding operation for irradiation; generating reception laser light for detecting an ultrasonic wave and transmitting the reception laser light to the object to be inspected for irradiation; collecting laser light scattered and reflected at surface of the object to be inspected; performing interference measurement of the laser light and obtaining an ultrasonic signal; and analyzing the ultrasonic signal obtained by the interference measurement. At least one of the transmission laser light generated in the transmission laser light irradiation step and the reception laser light generated in the reception laser light irradiation step is irradiated onto a welded metal part or a groove side surface.

The invention provides a smoke detector certification device based on a laser light scattering measurement principle. The smoke detector calibrating device comprises a certification instrument and a calibration instrument, wherein the certification instrument comprises a certification instrument processing circuit, a measurement cavity 14 and a first photoelectric sensor 13, the measurement cavity is provided with a first transparent window 20 and a second transparent window 21, and the calibrationinstrument comprises a second photoelectric sensor 17 and a trigger 18; a measurement beam 23 is incident from the first transparent window and exits from the second transparent window; the first photoelectric sensor 13 is used for detecting the light intensity of a scattered beam formed in a way that the detected smoke is scattered; the second photoelectric sensor 17 is used for detecting the light intensity of a transmitted beam which is formed by passing through the detected smoke and exits from the second transparent window; the trigger is used for synchronously triggering the first photoelectric sensor and the second photoelectric sensor. According to the smoke detector certification device, a calibration scheme of synchronously triggering the first photoelectric sensor and the second photoelectric sensor at high speed is adopted, so that the difficulty of no standard smoke sample is solved.

The invention discloses a method for measuring molecular weight and molecular weight distribution of lentinan. The method is characterized by comprising the following steps: adding lentinan to be detected into a sodium hydroxide solution for dissolving, adding a mobile phase, adding a hydrochloric acid solution for regulating the pH value, filtering, separating by utilizing a gel permeation chromatography (GPC) system, detecting by using a differential refraction detector and a laser light scattering detector, calculating the molecular weight data detected by the laser light scattering detector and concentration data detected by the differential refraction detector through GPC software so as to obtain the molecular weight and molecular weight distribution of lentinan. According to the method, the molecular weight and molecular weight distribution of lentinan can be rapidly and accurately obtained, and the method has high positive significance for improving the interior quality of the drug.

The related temporal resolution 2D laser optical scatterometer for large/small angle (20-90deg/0-20deg) comprises: a large angle detection system included two wide-aperture lens and a very sensitive array detector, a system central line fit to form some included angle with incidence light and detect the continual scattering signal in the range; a detection screen and another detector both on the incidence direction for scattering signal in small angle range. This invention can detect very poor signal or collects strong signal by screen imaging method.

An optical measurement instrument is an integrated instrument that includes an optical cavity with a light source, a sample cuvette, and an optical sensor. The instrument can be used for taking measurements of organism concentration in one or more samples. Preferably, the instrument holds multiple, individually-loaded, independent fluid samples and determines bacteria concentration via a forward-scattering signal. The instrument can incorporate onboard incubation to promote bacterial growth in the samples such that, once a certain bacterial concentration is achieved, the higher concentration sample can be used with a mass spectrometer to identify the type of bacteria. The instrument and mass spectrometer can be a part of a network for medical diagnostic testing data where data is stored in a manner that is inherently untainted by patient identifiable information.

The invention discloses a new technology of extracting, separating and purifying 0.1-1 million Da alkali solubility lentinan and a method of molecular weight determination, by taking a mushroom fruit body as raw material, a crude product is obtained by grinding, potash leaching, filtering, concentrating, washing, grading and drying under low temperature, and then the crude product is dissolved and centrifuged, purified by a DEAE cellulose column and absorbed and discolored by ion exchange resin, and filtered to pass through membrane packets of different molecular weights for ultrafiltrating and concentrating. The molecular weight is measured by adopting a GPC laser light scattering gel chromatograph, and the obtained material is respectively put into dialysis bags for dialysis according to the measured molecular weight range, after freeze drying, the alkali solubility lentinan of various components with a molecular weight of 0.1-1 million Da and the content of more than 98 percent is obtained. The method has the advantages of advanced technology, stable quality, high purity, clear goal and easy industrialized production.

The invention relates to a measurement method for air particle distribution through a laser light scattering method, and an apparatus thereof. The apparatus is characterized in that: the apparatus comprises: an air pump with a measurement chamber and an air pipe; a laser arranged on an opening position of the air pipe and a side of the measurement chamber; a light trapping area arranged on the opening position of the air pipe and the other side inside the measurement chamber; a photoelectric detection sensor, wherein the photoelectric detection sensor is arranged on the opening position of the air pipe and a side inside the measurement chamber, and has a focus-focus lens; a microcomputer control device connected with the electrical signal output of the photoelectric detection sensor; and a display screen. The electrical signal input of the display screen is connected with the electrical signal output of the microcomputer control device. The photoelectric detection sensor adopts a high-sensitivity avalanche diode. Compared to the prior art, the apparatus provided by the present invention has advantages of real availability, long time and real-time measurement, direct acquisition of measurement results, realizations of functions of data storage, data output, automatic measurement, alarm and the like, small size, light weight, convenient operation, high stability and high reliability.