142 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 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 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 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.

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.

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 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.