53 results about "Forward scatter" patented technology

The invention provides a low-orbit forward scattering detection method and system and a medium. Comprising the steps that a low-orbit forward scattering detection model based on Walker constellation configuration is constructed, each satellite and a receiver form a detection unit, and after an aerial target is excited by a radiation signal of a satellite group {}, if the kth detection unit meets a bistatic angle, according to the Cavalieri principle and a signal-to-noise ratio threshold condition, the kth detection unit meets the bistatic angle; determining a real effective coverage ratio meeting a geometric constraint condition and a detectable elevation threshold meeting a power constraint condition; an effective detection window is formed in the shadow cone unit based on the true effective coverage ratio and the detectable elevation threshold, and low-orbit forward scattering detection is performed. According to the method, the detection performance of the low-orbit forward scattering detection system under the conditions of different satellite numbers, different detection wavelengths and the like is analyzed, and theoretical support is provided for reliable airspace perception of the low-orbit giant constellation forward scattering detection system.

The invention provides a dual-wavelength smoke temperature composite fire detector and a detection method. The dual-wavelength smoke temperature composite fire detector comprises an infrared transmitting device, a blue light transmitting device, a 1 # light receiving device and a 2 # light receiving device, a thermistor is also included; optical axes of the infrared transmitting device, the blue light transmitting device, the 1 # light receiving device and the 2 # light receiving device are intersected at one point, the 1 # light receiving device receives forward scattered light of smoke particles to the infrared transmitting device and backward scattered light of the smoke particles to the blue light transmitting device, and the 2 # light receiving device receives backward scattered light of the smoke particles to the infrared transmitting device; and forward scattering light of the smoke particles to the blue light emitting device; the thermistor obtains environment temperature information; and identifying the type of the smoke according to the forward and backward scattering characteristic data of the smoke under the dual wavelengths and the environment temperature. According to the invention, functions of smoke detection and temperature detection are combined, and accuracy and reliability of fire detection are greatly improved by monitoring fire characteristic parameters of smoke and temperature at the same time.

The invention discloses an atmospheric aerosol detection method and system based on a dual-angle light scattering signal, and relates to the technical field of environment monitoring. The method comprises the steps that forward scattering signals and lateral scattering signals generated by particles to be detected in atmospheric aerosol conveyed into a detection area under laser irradiation are obtained, and environmental parameters of the atmospheric aerosol are obtained, specifically, the environmental parameters comprise at least one of the temperature value and the humidity value; and calculating a signal intensity ratio of the forward scattering signal to the lateral scattering signal of the to-be-detected particle, and inputting the signal intensity ratio of the to-be-detected particle, the forward scattering signal, the lateral scattering signal and the environmental parameters into a pre-trained particle size identification model to obtain a particle size value of the to-be-detected particle output by the particle size identification model. According to the scheme, the particle size detection precision of the particles in the atmospheric aerosol can be improved.

The invention discloses a super scattering and zero forward scattering coordinated regulation system and method based on optical gain, and relates to the technical field of optical scattering enhancement. The method comprises the steps that a space rectangular coordinate system is constructed; the cylindrical scatterer is vertically placed along the z axis; a transverse magnetic wave emitted by an emitting device is incident along the x axis; the emitting device emits the transverse magnetic wave, the transverse magnetic wave interacts with the cylindrical scatterer, and a total magnetic field of a free space in coordinates of the cylindrical scatterer is detected by using a detection device. Scattering coefficients and a total scattering cross section of different scattering channels of the cylinder are obtained based on the total magnetic field, key parameters for controlling scattering intensity and directivity are obtained based on the scattering coefficients and the total scattering cross section, and a scattering pattern is obtained by adjusting the key parameters of the cylindrical scatterer. The invention provides a new way for designing advanced optical devices applied to the fields of sub-wavelength antennas, optical communication, radar sensing, imaging and the like.

The application discloses a kind of identification systems of low cloud fog based on laser wide-area scanning, comprising the following steps:S1, according to the distance resolution data of laser radar fast wide-area scanning, the visibility information obtained by inversion;S2, according to the historical data training network model of forward scattering visibility meter and laser radar;S3, according to the visibility information, draw horizontal visibility distribution chart;S4, image processing is carried out to the visibility distribution chart, and the development path of low cloud fog is identified;And draw the low-visibility area boundary in the original drawing;S5, according to the low cloud fog development boundary identified, the visibility condition of each channel or road is obtained and output;Through the change process of fog in wide-range scanning port range, obtain all the visibility information in scanning range, and have high space-time resolution, can more fine observation entire sea fog change process, it is favorable to more fine guidance port navigation.

The present disclosure refers to optical system condition monitoring, including an automated method for determining a condition of an optical system, the condition comprising the presence of contamination in the optical system or the quality of focus of the optical system, the optical system comprising means for providing a sample and optical means, and being configured to produce a backscattering or forward scattering signal upon illumination.

A smoke detector is provided and includes a housing defining a chamber for receiving ambient materials, a single receiver, first and second emitters configured to emit light into the chamber to be respectively scattered from the ambient materials toward the single receiver with back scatter and forward scatter effects, respectively, and a controller. The single receiver generates first and second output signals in accordance with the light respectively scattered toward the single receiver with the back and forward scatter effects, respectively. The controller is receptive of the first and second output signals and determines whether a condition is appropriate to trigger an alarm.

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.

The invention provides a near-sun region photoelectric telescope detection twin system and method, which are used for simulating the near-sun region detection condition in a telescope view field. Comprising a sky background brightness simulation module which can interact with a photoelectric telescope, a forward scattering type visibility meter and a sky background radiance measurement instrument and is used for simulating and generating the sky background brightness; the limit detection capability calculation module is used for calculating the limit detection capability of the photoelectric telescope when the external environment and the system parameters are known; and the field-of-view detection display module is used for simulating distribution conditions of the observation target and the fixed star after the influence of the sky background is eliminated.

The application discloses a cross-medium uplink imaging simulation method based on a downlink light field, relates to the field of electric digital data processing, and comprises the following steps: based on a bidirectional reflectance distribution theory, an analysis model of laser reflection characteristics of an underwater target is established; based on an imaging simulation angle of the cross-medium, an imaging model of underwater forward scattering is established; through solving the geometric relation between the offset of a pixel point and a surface gradient, local geometric deformation is simulated and imaged; laser radar scanning imaging is simulated, and a cross-medium imaging simulation result is obtained; an ideal Lambert bidirectional reflectance distribution function is used to generate a target uplink light field, a point spread function model is used to solve target multiple scattering degradation imaging under the condition of a calm sea surface, and through constructing a nonlinear mapping of a wave surface gradient field and a light field phase offset, full-element dynamic simulation from laser emission, medium transmission to target imaging is completed.

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.

The invention discloses a method for simultaneously realizing OCT (Optical Coherence Tomography) enhancement and identification by using quantum dot particles. The method comprises the following steps: preparing a quantum dot material by using a hydrothermal method, an injection method, a one-pot method and the like, wrapping the obtained quantum dots or forming a shell-core structure so as to improve the stability and the luminescence property of the quantum dots, and regulating and controlling the size of the quantum dots to the size similar to the wavelength used by OCT so as to realize forward scattering enhancement or transverse scattering enhancement of invisible light of the wave band used by OCT; and the resolution or the detection depth is improved. Meanwhile, the quantum dot particles can emit visible fluorescence under the excitation of blue-violet light, and the enhancement position is marked while the detection is enhanced. The invention provides a new OCT (Optical Coherence Tomography) graph enhancement thought, scattering enhancement is realized by matching the size-controllable quantum dot material with the wavelength of the quantum dot material, and meanwhile, an observation part is identified through light emission of the quantum dots under the irradiation of visible light, so that the purposes of enhancing the image and easily distinguishing the observation part are realized at the same time; the method has an important value for improving the use of OCT.

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.

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.

The application provides a fog detection imaging method of active polarization fog removal and noise removal processing cooperation, laser active illumination is used to increase target surface illumination, a space gating imaging mechanism of distance gating is used to shield scattered light from a non-gating area, and the signal-to-noise ratio of target detection in a scattering medium scene is improved; for the superimposed signal of target light and scattered light collected from the gating area, a scattering imaging model based on active detection is established, a polarization fog removal algorithm under active detection is developed based on the polarization difference between the target light and the backscattering light, and the influence of the backscattering light is removed; based on the additive noise property of the forward scattering light on the image, the BM3D algorithm is used to remove the influence of the additive noise such as the forward scattering light to optimize the image, and clear imaging of the target in the thick fog scene is realized; the application uses the fusion means of the active detection mode and the polarization fog removal algorithm, and can realize the fog-transparent detection imaging with the consideration of resolution and speed in the thick fog scene.

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.

The invention discloses an automatic focusing Brillouin scattering spectrum measurement system, which relates to the field of spectrum measurement, and comprises a laser used for emitting laser for exciting Brillouin scattering; the Brillouin light path system comprises a reference light path, a forward scattering light path and a backward scattering light path and is used for guiding the laser to a sample and collecting scattering signals, and the Brillouin light path system has the following measurement modes: a forward scattering measurement mode in which the laser enters the sample through the forward scattering light path; by integrating the automatic focusing system and the three-dimensional motion mechanism, the closed-loop control of the sample position in the Brillouin scattering spectrum measurement process is realized, the photoelectric sensor is used for detecting the maximum value of the axial light intensity to lock the focal plane, and the CCD image analysis is combined to realize the radial accurate positioning, so that the focusing precision is effectively improved, and the measurement precision of the Brillouin scattering spectrum is improved. The measurement repeatability and the data reliability are remarkably improved, meanwhile, the refocusing time after sample adjustment is effectively shortened, and the anisotropic crystal polycrystal orientation spectrum collection efficiency is greatly improved.

The invention discloses a viscous sound medium preprocessing iteration method one-way wave migration method based on thin plate approximation. The method comprises the following steps: firstly, obtaining an actual seismic record; calculating a forward scattering migration wave field by using a viscous-acoustic medium preprocessing iteration method based on thin plate approximation, and calculating a back scattering migration wave field of the seismic record by taking observation data as a boundary value condition; and finally, scattering wave imaging is carried out by using a cross-correlation imaging condition, and a final migration imaging field is obtained. In the whole process, in order to avoid the influence of the instability of a strong disturbance medium background Green function on an imaging result, a small imaginary part attenuation component is introduced to improve the divergence problem of the Born series in a strong disturbance medium, and the calculation efficiency is further accelerated by utilizing a pre-solution factor. In order to avoid the problem of solving a large iterative matrix, a speed model is divided into thin plates by utilizing the thought of thin plate division, so that global calculation is converted into local calculation, and migration imaging with relatively high efficiency and relatively high precision is finally realized through the process.

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 application provides a near-solar region photoelectric telescope detection twin system and method, which is used for simulating the detection condition of the near-solar region in the field of view of the telescope. The system comprises: a sky background brightness simulation module, which can interact with a photoelectric telescope, a forward scattering type visibility instrument and a sky background radiance measuring instrument, and is used for simulating and generating sky background brightness; a limit detection capability calculation module, which is used for calculating the limit detection capability of the photoelectric telescope under the known external environment and system parameters; and a field of view detection display module, which is used for simulating the distribution condition of the observed target and the stars after the influence of the sky background is eliminated.

To provide a disaster prevention facility capable of preventing and suppressing expansion of a fire and extinguishing a fire by discriminating a semiconductor manufacturing gas fire by silane gas or the like.SOLUTION: In a fire detection device, a signal detection section 16 performs: irradiating a detection object with light of a prescribed wavelength; detecting a detection value A1 from a light receiving signal obtained at a front scattering angle 40°; detecting a detection value A2 from the light receiving signal obtained at a back scattering angle 110°; and detecting a detection value A3 from the light receiving signal obtained at a scattering angle 90°, a discrimination section 18 discriminates that a fire is a semiconductor manufacturing gas fire generating monodisperse particles when a predetermined discrimination condition is satisfied, which corresponds to Rayleigh scattering to allow the detection value A3 to be the minimum value with respect to the detection value A1 and the detection value A2, and a detection output section 20, when the detection value A1 or the detection value A2 satisfies a predetermined fire detection condition in a state where the semiconductor manufacturing gas fire is discriminated, outputs a discrimination result that the fire is the semiconductor manufacturing fire together with a fire to the outside.SELECTED DRAWING: Figure 1

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.

This application relates to a wide-area atmospheric wind field detection system based on forward scattering, comprising: a ground-based laser emission system, including a laser and a scanning device, which is arranged on the ground; and a space-based optical receiving system, including a receiving telescope and an optical receiver device, which is arranged on an airborne platform. And a wide-area atmospheric wind field detection method based on forward scattering is provided for the above system, including: emitting a laser into the air at a set angle backward of the airborne platform after the scanning device detects it; wherein, the laser generates a forward scattering signal through the forward scattering effect of atmospheric particles; using the receiving telescope and the optical receiver device to receive the forward scattering signal at a specified angle; and generating wind field data according to the forward scattering signal. The airborne platform only carries a receiver, which can reduce the requirements for the load and power consumption of the satellite platform, and the deployment of the laser on the ground can reduce the platform limitations. Moreover, the satellite receives the forward scattering signal, avoiding the atmospheric attenuation of the return of the echo signal, which is beneficial to improving the signal-to-noise ratio and detection accuracy.

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.