29 results about "Forward scatter" patented technology

The present invention is a cuvette assembly for use in optically measuring at least one characteristic of particles within a plurality of liquid samples. The cuvette assembly comprises a main body having internal walls and external walls, and a plurality of cuvettes within the main body at least partially being defined by the internal walls. Each of the plurality of cuvettes has a liquid-input chamber for receiving a respective one of the plurality of liquid samples, a filter, and an optical chamber for receiving a respective filtered liquid sample caused by passing the respective one of the plurality of liquid samples through the filter. Each of the optical chambers includes an entry window for allowing transmission of an input light beam through the filtered liquid sample and an exit window for transmitting a forward scatter signal caused by the particles within the filtered liquid sample.

This invention relates to the field of substance concentration measurement technology and discloses a VOCs concentration distribution monitoring system in a spray booth, including a feature detection module, a signal receiving module, a pneumatic protection module, a concentration inversion module, and a differential pressure adjustment module. The signal receiving module receives the transmitted signal through a central detector and captures the forward scattered signal using a ring detection array. The concentration inversion module determines the particle size shift of paint mist particles during the phase transition process based on the ratio of transmitted to scattered light intensity, thereby correcting the extinction section parameter in real time and outputting concentration data. The differential pressure adjustment module maintains a slightly positive pressure inside the pneumatic protection module that is 5 Pa to 15 Pa higher than the ambient static pressure. This invention utilizes the scattering physical characteristics to offset the measurement error caused by the nonlinear attenuation of paint mist particle size in situ, effectively eliminating the optical path signal interference caused by droplet evaporation in a multiphase flow field.

A novel method is disclosed for obtaining transmission scan data in a PET scanner by incorporating one or more stationary gamma ray sources that provide forward scattered gamma photons that can be used as transmission imaging radiation.

This invention discloses a high-resolution liquid particle counting device and its optical path debugging method, belonging to the field of liquid particulate matter detection. The liquid particle counting device includes a light source module, which includes a laser and its shaping mirror assembly; a flow control module, located at the rear end of the light source module and including a flow control housing with a flow control chamber inside, the detection area being located at the center of the second cavity of the flow control chamber; a forward collection module, located at the rear end of the flow control module, for collecting forward scattered light; and a side collection module, located on the side of the flow control module, for collecting side scattered light. This invention increases particle size resolution and improves detection accuracy through the integrated detection of forward and side scattered light.

A module includes one or more focusing optics, a flowcell configured to receive one or more particles, a collimated laser configured to shine a beam of light through the one or more focusing optics onto the flowcell, wherein the one or more focusing optics is configured to provide a beam of light from the collimated laser that overfills a width of the flowcell a side scatter optical train which includes one or more optics and one or more side scatter detectors, wherein the one or more side scatter detectors are configured to receive light scattered by the one or more particles, a forward scatter optical train which includes a forward scatter mask, one or more optics, and one or more forward scatter detectors, wherein the one or more forward scatter detectors are configured to receive the scattered light.

Provided are devices and systems including angled flow cells enabling the collection of side and forward scatter and methods of using such angled flow cells. The flow cells including a first optically clear layer and a second optically clear layer; an opaque middle layer disposed between the first optically clear layer and the second optically clear layer, the opaque middle layer including a void and; a sealed chamber formed by the combined edges of the void, the first optically clear layer, and the second optically clear layer; a front prism disposed on an outer surface of the first optically clear layer, wherein the outer surface of the first optically clear layer is opposite the outer surface of the second optically clear layer; and at least one light collection lens.

The invention belongs to the field of meteorological research, and particularly relates to a visibility measurement method and system based on forward scattering. The measurement method comprises the following steps: S1, emitting a laser beam to a to-be-measured area; s2, detecting the scattered light intensity in the scattering angle theta direction of a preset point on the laser beam through a detector, and converging the multi-angle scattered light to the detector through an optical component before the detector detects; s3, calculating the meteorological visibility of the predetermined point according to the scattered light intensity; s4, a detector is moved in the emission direction of the laser, the detector is kept to be located in the scattering angle theta direction of the laser beam all the time, and the meteorological visibility at a plurality of preset points is obtained in sequence; and S5, calculating the meteorological visibility of the to-be-measured area according to the meteorological visibility of the multiple points. According to the invention, the measurement sensitivity and accuracy in severe weather can be obviously improved.

A module includes one or more focusing optics, a flowcell configured to receive one or more particles, a collimated laser configured to shine a beam of light through the one or more focusing optics onto the flowcell, wherein the one or more focusing optics is configured to provide a beam of light from the collimated laser that overfills a width of the flowcell a side scatter optical train which includes one or more optics and one or more side scatter detectors, wherein the one or more side scatter detectors are configured to receive light scattered by the one or more particles, a forward scatter optical train which includes a forward scatter mask, one or more optics, and one or more forward scatter detectors, wherein the one or more forward scatter detectors are configured to receive the scattered light.

To keep forward-scattered light from mixing even when capillaries are concentrated in a narrow space, the present invention has a light sheet (121) that irradiates laser light (141) at a plurality of capillaries (122), a line sensor (123) that receives forward-scattered light (142) that is scattered on the reverse side of the capillaries (122) from the side at which the laser light (141) is irradiated, first laser blockers (111) that are provided at positions that are near a light source unit that includes an alignment surface for the capillaries (122) on the side at which the laser light (141) is incident and are offset from projections of the center axes of the capillaries (122) in the direction of the light sheet (121), second laser blockers (112) that are provided between the capillaries (122) between the capillaries (122) and the line sensor (123), and third laser blockers (113) that are provided at a light reception surface of the line sensor (123) at positions that coincide with projections of the center axes of the capillaries (122) in the direction of the line sensor (123).

1. An apparatus for measuring blood flow parameters in a blood vessel, comprising: an interferometric data collection device comprising a light source and a sensor connected to a controller, the controller comprising: 11. The apparatus of claim 10, wherein the apparatus is configured to: direct the light source toward a proximal side of a blood vessel; acquire interference data from tissue adjacent and exterior to a distal side of the blood vessel opposite the proximal side; determine a signal modulation ratio based on the interference data; and estimate a blood flow parameter within the blood vessel based on the signal modulation ratio.

The application discloses a kind of based on optical gain's ultra-scattering and zero forward scattering synergic control system and method, it is related to optical scattering enhancement technical field.Method includes constructing space rectangular coordinate system, let cylindrical scatterer be placed vertically along z axis, transverse magnetic wave is emitted by emission device along x axis incidence, emission device emits transverse magnetic wave, let transverse magnetic wave and cylindrical scatterer interact, total magnetic field in the free space of cylindrical scatterer coordinate is detected using detection device, based on total magnetic field, scattering coefficient of different scattering channels of cylinder and total scattering cross section are obtained, based on scattering coefficient and total scattering cross section, key parameters for controlling scattering intensity and directionality are obtained, scattering pattern is obtained by adjusting key parameters of cylindrical scatterer.The application provides a new way for designing advanced optical devices applied in subwavelength antenna, optical communication, radar sensing and imaging and other fields.

The invention relates to a sample analyzer and a body fluid sample detection method. The method comprises the following steps: acquiring optical signal data of a to-be-detected liquid prepared based on a body fluid sample; the light signal data comprises at least two of a forward scattering light signal, a lateral scattering light signal and a fluorescence signal; generating a scatter diagram of the to-be-detected liquid according to the optical signal data; determining a scatter diagram type and / or an abnormal region in the scatter diagram based on the scatter diagram; the scatter diagram type comprises a normal type, a detection anomaly type and a quality anomaly type; under the condition that the scatter diagram type is abnormal, determining at least one of an auxiliary diagnosis result and a sample quality inspection result of the body fluid sample according to the scatter features of the abnormal region and the scatter diagram type; the scatter features are used for representing the particle distribution condition of the abnormal region. According to the method, by determining the abnormal area of the scatter diagram, targeted recognition and judgment can be performed according to the scatter features in the abnormal area of the scatter diagram, and the sensitivity and specificity of an auxiliary diagnosis result and / or a sample quality inspection result are / is improved.

The present application relates to a kind of aerosol particle optical detection device, comprising: light source, for emitting light beam to irradiate into the aerosol particle of detection area;Aerosol flow channel, for the scattered light detection of aerosol particle;Digital micromirror array component, for the deflection modulation and convergence of different annular aperture scattered light;Distributed single-point detector, for receiving the annular aperture scattered light of convergence, and converting optical signal into electrical signal.The present application is a kind of by digital micromirror array and distributed single-point detector aerosol particle light scattering counting detection device, by the angle selection of each micro-mirror in digital micromirror array, the scattered light of different particle size particles is converged into several single-point detectors respectively, can avoid using large area array multi-element photodetector, while improving the collection efficiency of forward scattering light energy, and no need to calibrate F-D curve, so there is no problem of inaccurate particle size detection caused by Mie resonance zone.

This invention relates to the field of radar imaging technology, and more particularly to a shadow inverse synthetic aperture imaging method employing back projection. The proposed method utilizes a forward-scattering surface target scattering model to provide a reference signal, and then performs correlation processing between the reference signal and the target echo, theoretically achieving optimal imaging resolution. Since it does not employ slant-range approximation, this method is applicable to any relative positional relationship between the target and the radar, thus eliminating phase errors caused by the target obliquely crossing the baseline. This offers an advantage over traditional large diffraction angle algorithms when the target does not perpendicularly cross the baseline.

Aiming at the problem of detection blind area caused by strong direct wave interference in bistatic imaging sonar system, a narrow-band filtering method based on fractional Fourier transform domain is proposed. The characteristic of linear frequency modulation signal is that it appears as an impulse in the fractional Fourier transform domain at its best transform order. The fractional Fourier transform of the best order is performed on the element domain signal to separate the direct wave from the echo. Then the direct wave is eliminated in the fractional Fourier transform domain. Finally, the forward scattering time domain signal of the seabed is reconstructed by fractional inverse Fourier transform. Further, the acoustic imaging processing is performed on the signal processed by fractional filtering, and the acoustic imaging result after direct wave suppression is obtained. Compared with the traditional bistatic sonar imaging, the method can effectively suppress the direct wave, reduce the direct wave masking area in the bistatic acoustic imaging, and improve the detection blind area problem caused by the direct wave in the traditional bistatic sonar imaging.

The invention particularly relates to a method and a system for detecting a phase splitting point of a two-phase absorbent for capturing CO2, and belongs to the technical field of carbon dioxide capturing. The method comprises the following steps: controlling the temperature of an absorbent in a phase splitter, and irradiating with laser with a specific wavelength; a linear array CMOS sensor is used for receiving forward scattered light in the range of 0.1-0.29 degrees and converting the forward scattered light into an electric signal, and a light intensity sequence I (t) is obtained; cO2 is introduced for absorption-standing circulation; by calculating the light intensity relative attenuation rate R (t) and monitoring whether the light intensity relative attenuation rate R (t) is continuously lower than the threshold value Rth for reaching the time Thold or not, the phase splitting point is automatically judged, and the CO2 load is recorded. The system comprises a corresponding optical detection module, a signal processing module and a control analysis module, objective, real-time and high-precision detection of phase splitting points is achieved, and the problems that a traditional naked eye method is large in subjective error, and an existing instrument method is insufficient in sensitivity or difficult to be online are solved.

The invention discloses a forward and backward scattering integrated microwave photon radar system, and the system comprises a light source module which is used for generating an optical carrier signal; the signal generation module is used for generating a chirp signal based on the optical carrier signal and modulating the chirp signal to the optical carrier to form an optical sideband signal; the photoelectric conversion module is used for converting the optical sideband signal into a microwave signal; the transmitting antenna is used for transmitting the microwave signal to irradiate a target in a detection area; and the receiving antenna is used for receiving the microwave signals scattered back by the target, and the scattered signals comprise forward scattered signals and / or backward scattered signals. According to the invention, high-coherence processing and fusion of forward and backward scattering signals are realized on the same optical domain platform through a microwave photon technology, so that high-sensitivity detection of a small-radar-sectional-area target and accurate distance resolution of the target can be obtained at the same time.

The utility model discloses an atmospheric mist drop forward scattering characteristic detection device, emit light source unit and the correction unit, detection window, forward scattering detection unit that set gradually along the light path of emitting light source unit emit, and forward heat removal unit includes spatial filter wheel, and the second reflector of oblique setting is fixedly connected on spatial filter wheel, and the second reflector is used for separating transmission light and mist drop forward scattering light. In the utility model, through setting spatial filter wheel at this detection end of forward scattering detection unit, and setting the reflector of inclination, can separate transmission laser beam and scattered light, avoids the detection of scattered light.

The invention discloses a forward scattering type visibility meter capable of being calibrated on line and a calibration method. The forward scattering type visibility meter comprises an emitter, a receiver and a data acquisition unit. The emitter is provided with a bypass detection device, and the laser power is monitored in real time through a light splitting device; the receiver is provided with a detection laser with the same wavelength as the main light source, so that coaxial calibration is realized; and the data acquisition unit verifies the ADC linearity through an analog signal. According to the three-stage calibration system, a transmitting end performs closed-loop adjustment on driving parameters to keep laser power stable; a receiving end detects optical window pollution and detector aging; and the data acquisition end automatically calibrates signal processing parameters. The technology realizes full-automatic online calibration, can compensate influences of factors such as laser aging and optical pollution in real time, enables visibility measurement precision to be stabilized in a range of + / -5% for a long time, and is especially suitable for key places such as airport runways needing continuous monitoring.

This invention relates to the field of underwater weld technology and discloses a method and system for forward modeling of nonlinear ultrasonic scattering in the early stage of underwater welds. The method includes: obtaining material nonlinear parameters based on the ratio of second harmonic to fundamental wave amplitude; obtaining interface contact nonlinear parameters through the second harmonic amplitude in the reflected wave from the crack interface; establishing water-solid interface propagation conditions and constructing a sound velocity model; combining the sound pressure superposition relationship under multipath propagation and array excitation conditions to obtain the total fundamental wave sound pressure at any receiving point within the weld; and constructing a unified nonlinear ultrasonic forward scattering model by introducing equivalent local nonlinear parameters for unified characterization. This invention, by constructing a unified characterization model of material nonlinearity and contact acoustic nonlinearity, and combining the water-solid coupling propagation mechanism with Green's function forward modeling, can improve the completeness of the description of nonlinear ultrasonic scattering mechanisms and the accuracy and stability of the quantitative characterization of early-stage micro-damage in underwater welds.

This invention discloses a pyrolysis particle detection system, belonging to the field of fire detection technology. It includes an airflow acquisition module, a photoelectric detection module, an environmental parameter sensing module, a processing unit, and an alarm module. The photoelectric detection module is equipped with two laser sources of different wavelengths. It acquires the intensity of scattered light from particles at the two wavelengths at a preset forward scattering angle and calculates their ratio. It utilizes the difference in wavelength dependence between submicron pyrolysis particles and larger dust particles to identify and determine the concentration of pyrolysis particles. The environmental parameter sensing module acquires characteristic gas concentration and temperature information. The processing unit generates a fire risk value based at least on the pyrolysis particle concentration change rate, the cumulative characteristic gas concentration, and the temperature change rate, and outputs an alarm signal when the risk value exceeds a threshold. This invention can capture pyrolysis particles before visible smoke is generated, offering advantages such as very early warning, strong anti-interference capability, and adaptively adjustable sensitivity.

The utility model discloses a multispectral water body attenuation and forward small-angle scattering measurement device, which is characterized by comprising a light source, a scatterer and a water body attenuation and forward scattering luminous flux detection module, wherein the light source comprises N collimation lasers and a laser output gating module; each collimating laser is transmitted or reflected by the laser output gating module after being subjected to electric control time-sharing gating, and then outputs a single-wavelength collimating working light source in a time-sharing manner; the single-wavelength collimation working light source is scattered by the scatterer to form scattered light in different directions; the water body attenuation and forward scattering luminous flux detection module comprises a scattered light receiving and converging hyperbolic convex lens, an optical filter and an area array CCD (Charge Coupled Device); scattered light is collimated and converged to a radial optical filter through a scattered light receiving and converging hyperbolic convex lens, and scattered light signals are attenuated by the optical filter according to the attenuation amount of the radial optical filter in proportion and then are incident to a photosensitive element of the area array CCD. According to the utility model, measurement of multi-wavelength multi-angle forward small-angle volume scattering functions is realized.

The present application belongs to the technical field of underwater acoustic channel and physical field, and relates to a numerical hybrid calculation method of forward scattering acoustic field of a regular shape object underwater. The method comprises: obtaining an initial projection profile of a three-dimensional geometric model of the regular shape object under a specified projection plane and an incident direction; dividing discrete points of the initial projection profile into upper boundary points and lower boundary points; interpolating and completing the upper boundary points and the lower boundary points, so that the upper boundary points and the lower boundary points have the same number and share the same horizontal coordinates; discretizing the completed projection profile by using trapezoidal plane elements; calculating a forward scattering far field pattern function based on the discretization result; and calculating a forward scattering target strength of the object. The method provided by the present application can cover the shape range of the scattering object applicable to the analytical method, and does not need to calculate complex series expressions composed of special functions such as Bessel functions and spherical harmonic waves, thereby obviously improving the calculation efficiency.

The paramagnetic garnet-type transparent ceramic a sintered object of a composite oxide represented by formula (1), (Tb1-x-yYxScy)3(Al1-zScz)5O12 (0.05≤x<0.4, 0≤y<0.004, 0.6≤1−x−y<0.95, 0≤z<0.004, and 0.001<y+z<0.005), which contains SiO2 as a sintering aid in an amount larger than 0 mass % but not larger than 0.1 mass %, and having an average sinter-grain diameter of 5 μm or larger. The transparent ceramic has a total light transmittance of 84.0% or greater and a forward scatter of 0.5% or less at an optical path length of 25 mm and a wavelength of 1,064 nm and has a total light transmittance of 84.0% or greater and a forward scatter of 0.5% or less at an optical path length of 25 mm and a wavelength of 1,300 nm. In the formula (1).

The application provides an optical superstructure coating for temperature reduction of high-voltage transmission lines and a preparation method and application thereof. The optical superstructure coating of the application comprises at least one micro-nano medium with a high scattering characteristic value and at least one functional polymer material medium with a high emission characteristic value. The optical superstructure coating with high electromagnetic wave resonance characteristics is coated on the outer surface of the high-voltage transmission line to realize sustainable and efficient passive cooling of the high-voltage transmission line in a high-temperature environment. After optimization of the multi-physical field model, the micro-nano particles with high forward scattering characteristics are randomly and uniformly distributed in the optical superstructure coating, so as to accurately control the wide-spectrum response peak value of the sunlight wave band and the mid-infrared thermal radiation wave band. The optical superstructure design of "multi-stage scattering-high efficiency reflection" solves the safety hidden trouble problem of high-voltage transmission lines and other power equipment caused by high temperature in a high-solar radiation environment, and significantly reduces the cost of the existing cooling means.

To prevent the mixing of forward scattered light even when capillaries are integrated in a narrow space.SOLUTION: A light sheet 121 that irradiates the plurality of capillaries 122 with laser light 141, a line sensor 123 that receives forward scattered light 142 scattered to a side opposite to a side irradiated with the laser light 141 with respect to the capillaries 122, a first laser blocker 111 disposed at a position close to a light source unit including an alignment surface of the capillaries 122 on a side on which the laser light 141 is incident and at a position shifted from a position at which an axial center of the capillary 122 is projected in a direction of the light sheet 121, and a second laser blocker 112 installed between the capillary 122 and the line sensor 123 and between the capillaries 122; And a third laser blocker 113 installed at a position where the axial center of the capillary 122 is projected in the direction of the line sensor 123 on the light receiving surface of the line sensor 123.SELECTED DRAWING: Figure 1

The invention provides a multi-wavelength optical detection device. The multi-wavelength optical detection device comprises a flow chamber; the first laser is arranged on one side of the flow chamber and emits laser with the wavelength of lambda 1 to irradiate the flow chamber; the at least one second laser is located on one side of the flow chamber and emits laser with the wavelength of lambda 2 to irradiate the flow chamber, the included angle alpha between the second laser and the first laser is larger than or equal to 30 degrees and smaller than or equal to 150 degrees; the first receiving assembly is arranged on the other side of the flow chamber and is used for receiving and processing a forward scattering signal, a lateral scattering signal and a fluorescence signal of the laser emitted by the first laser; and the second receiving assembly is arranged on the other side of the flow chamber and is used for receiving and processing fluorescence signals of the laser emitted by the corresponding second laser. At least two lasers with different wavelengths are adopted, different excitation wavelengths in cells passing through the flow chamber can be detected at the same time, the structure is simple, and the cost is low.