153 results about "Backscatter" patented technology

The invention relates to the technical field of nuclear radiation imaging, in particular to a radiation array detector, a back scattering imaging system and a back scattering imaging method. The radiation array detector comprises an X-ray photon absorption structure which comprises high-strip-shaped scintillators and low-strip-shaped scintillators which are alternately arranged, the high-strip-shaped scintillators are used for detecting back scattering X-ray photons incident at all angles, the low-strip-shaped scintillators are used for accurately determining the incident direction of the X-ray photons through the collimation effect, and the high-strip-shaped scintillators and the low-strip-shaped scintillators are used for detecting the incident direction of the back scattering X-ray photons; after X-rays enter the photon absorption structure, the high-strip-shaped scintillators and / or the low-strip-shaped scintillators receiving X-ray photons generate scintillation photons. The silicon photomultiplier array is connected with the high strip-shaped scintillator and the low strip-shaped scintillator through a light guide and is used for converting scintillation photons into photoelectric signals; and the position and energy information coding circuit is used for carrying out position and energy information coding on the photoelectric signals generated by the silicon photomultiplier array. According to the invention, the detection efficiency and the direction identification capability of the back scattering X-ray can be effectively improved.

The invention relates to the field of optical measurement, in particular to a reflective interference film thickness measurement method and system for eliminating back scattering of a transparent substrate, and the method comprises the following steps: transmitting a light beam through a low-coherence-length broadband light source, and forming linearly polarized light through polarization modulation; focusing the light beam to the surface of the film through a confocal optical system; collecting reflection interference signals of the upper surface and the lower surface of the film; spatial filtering, low-coherence gating and polarization control are used for cooperatively inhibiting back scattering of the substrate. And processing the acquired interference signal, and calculating to obtain film thickness information. According to the invention, triple inhibition mechanisms are adopted for synergistic effect, and the method comprises the following steps: spatial filtering: shielding out-of-focus back reflected light through a confocal small hole; low-coherence gating: using a short coherence length to naturally suppress a reflected signal beyond a coherence range; and polarization control: further weakening stray light interference through polarization state matching, and effectively suppressing back scattering of the substrate.

The invention discloses a portable X-ray back scattering security check system based on AI image enhancement. The system belongs to the technical field of radiation imaging, and comprises a sensing unit used for sensing physical situation information in an imaging process so as to generate time-sequenced physical prior data; the prediction unit is used for predicting a future scanning behavior based on the physical prior data to generate a feed-forward control instruction and prediction confidence; the regulation and control unit is used for adaptively regulating and controlling scanning parameters based on the feedforward control instruction and recording execution information including regulation and control residual errors; and the AI reconstruction processor is used for performing enhanced reconstruction on the original X-ray image based on the physical priori data, the prediction confidence and the execution information. By constructing an intelligent closed loop of perception, prediction, regulation and control and reconstruction, physical uncertainty information in the imaging process is quantized and used for guiding AI reconstruction, so that the problem of information fault between physical acquisition and digital reconstruction is solved, and the quality and reliability of a final image are improved.

Methods and devices for analyzing a sample from a subject are provided. A device includes one or more coherent light sources and one or more partially coherent light sources. The light sources are configured to emit first and second wavelengths of electromagnetic radiation towards an imaging chamber configured to hold blood cells. The light sources are aligned to illuminate a single common area of the imaging chamber. The device includes optics positioned to receive light from the imaging chamber, and a detector in optical communication with the optics. The detector is configured to detect fluorescence emission and backscatter from blood cells when present in the imaging chamber. The device includes mixers / unmixers configured to replicate and mix first and second signals representative of the responses to the first and second wavelengths after interacting with the plurality of blood cells to generate spectro-spatial responses.

A backscatter x-ray system has an x-ray device, a movable platform, and a processor. The x-ray device includes an x-ray emitter and an x-ray detector. The movable platform positions the x-ray device relative to a frontside of a structure. The processor is communicatively couplable to the x-ray device. The x-ray emitter emits x-rays that penetrate the structure from the frontside. The x-ray detector detects a backscatter of the x-rays reflected from the structure. The processor generates x-ray images of the structure based on the backscatter, and analyzes the x-ray images in a manner facilitating at least one of manufacturing and inspection of the structure.

A vacuum cleaner device comprises a housing having a motor fan assembly configured to generate an airflow along an airflow path extending between a dirty air inlet and a clean air outlet. At least one dust particle sensor assembly is mounted along the airflow path and downstream of the motor fan assembly wherein the at least one dust particle sensor assembly comprises a light source and a light detector wherein the light detector is configured to generate a detected light signal in response to backscattered light from dust particles in the airflow. A controller is connected to the at least one dust particle sensor assembly and configured to generate a signal indicative of the operational status of the vacuum cleaner device in response to the received detected light signal from the at least one dust particle sensor assembly.

The invention relates to a reduced-size FMCW lidar imager system. The imager system comprises an optical source 10 for a coherent, continuous and frequency-modulated primary signal Sp in order to illuminate the scene 2; an optical collection element 41 configured to collect a backscattered signal Sret,c; a photodetector 50 intended to receive a heterodyne signal Sh associated with the collected signal Sret,c; and a processing unit 60 configured to determine the distance zsc from the scene based on a beat frequency of the heterodyne signal sh. It is configured to fully direct the primary signal Sp to the scene 2. It additionally comprises a reflector 42 configured to reflect a portion Spr,nc, called uncollected signal Sret,nc, of the backscattered signal Sret, not collected by the optical collection element 41, in the direction of the scene 2.

According to the high-gain back scattering detector and the observation system provided by the invention, the detector can be adaptively integrated with the immersed objective lens, and the combination scheme can realize the remarkable advantage of no loss of the working distance. According to the detector provided by the invention, the light path conduction structure is optimized, and the detector is cooperatively matched with the immersed objective lens, so that the advantage of high-resolution imaging of the immersed objective lens is reserved, the efficient capturing capability of the detector on backscattered electrons is maintained, and sufficient working distance can still be ensured in a high-precision observation scene. The flexible optical fiber is adopted to complete optical signal transmission in the sample bin, the length and the overall size of the light guide pipe can be effectively reduced, and the situation that a large-size light guide pipe of a conventional scintillator type back scattering electron detector occupies too much space in the sample bin is avoided. In addition, the detector realizes four-channel independent imaging of the scintillator type back scattering electron detector through a customized four-channel light guide pipe by connecting an independent optical fiber and a PMT.

A system may include a fiber optic cable buried under a surface and a smart sensor module coupled to the fiber optic cable. A controller may be coupled to the smart sensor module. The smart sensor module includes a light source coupled to an end of the fiber optic cable and a detector coupled to the end of the fiber optic cable. The controller may manage a transmission of a pulse of light from the light source to launch the pulse of light into the fiber optic cable. The detector may receive a backscatter generated from the pulse of light scattered off fiber molecules of the fiber optic cable. The smart sensor module may determine a temperature of the fiber optic cable based on an intensity of the generated backscatter. The controller may send an alert when the determined temperature is outside a predetermined threshold range from a base temperature.

This optical fiber wireless transmission system comprises: an optical transmitter (10) that converts a wireless signal and a monitoring swept-frequency signal in a frequency band different from the frequency band of the wireless signal into an optical signal having an intensity and outputs the optical signal as transmitted signal light; an optical receiver (20) that receives the transmitted signal light from the optical transmitter (10) via an optical fiber (40); and an optical fiber deterioration monitoring device (30) that converts backscattered light of the transmitted signal light from the optical transmitter (10) caused by the optical fiber into an electrical signal, detects the monitoring swept-frequency signal as a reference signal, and performs arithmetic processing to obtain an impulse response.

This invention discloses a method for correcting backscatter intensity jumps in multibeam measurement strips. The method uses a Gaussian weighted function to automatically detect backscatter intensity jumps caused by factors such as equipment parameter settings, taking a moving window as the unit. Weighted average values ​​are then used for difference compensation. The corrected intensity data is iteratively detected and corrected for jump points until the jump points converge to 0. Example calculations show that this method can effectively detect and correct intensity jumps in multibeam strips, improving the efficiency and quality of multibeam strip backscatter intensity data processing and enhancing the accuracy of seabed geomorphological analysis based on multibeam intensity data.

The invention discloses a deep sea multi-beam sound intensity data reconstruction method and device fusing an attention mechanism. The method comprises the following steps: respectively designing damages of different sizes, including rectangular damages and irregular damages, for multi-beam backscattering intensity images of a shallow sea area and a deep sea area, taking the intensity images of the shallow sea area as a training set and a test set, and taking the images of the deep sea area as a verification set; a UNet structure is used as a trunk, and a residual module and a multi-scale channel space attention mechanism are fused to construct a UNet-MCSA intensity image restoration model; and repairing the damage intensity image by using a nearest neighbor interpolation method to obtain an NNI repaired image, and constructing a UNet-MCSA-NNI model through a histogram registration method by taking the UNet-MCSA repaired image as a basis and the NNI repaired image as a reference to obtain a deep sea multi-beam backscattering intensity repaired image with both high precision and visual fidelity. The depth and depth are combined, advantages are complementary, and a new normal form is provided for deep sea multi-beam backscattering intensity image restoration.

Method (100) for detecting at least one object (2) in a region (4), comprising: providing (102) at least one laser feedback interferometry sensor device (202); aligning (104) the at least one laser feedback interferometry sensor device (202) such that the region (4) is illuminated by at least one laser beam (204) of the at least one laser feedback interferometry sensor device (202); operating (106) the at least one laser feedback interferometry sensor device (202) by means of a periodic modulation signal (208) such that a wavelength of the laser beam (204) of the laser feedback interferometry sensor device (202) is modulated in a pattern depending on the modulation signal (208); Detection (108) of an interference signal (16) generated by rays (206) of the laser beam (204) backscattered by the at least one object (2) in the laser feedback interferometry sensor device (202);Transforming (110) at least part of the interference signal (16) into at least one frequency spectrum (18) of a frequency range; detecting (112) the presence of the at least one object (2) in the range (4).;

Disclosed herein are methods and systems for performing sample extraction and protective cap placement for highly reactive materials within a charged particle microscope system. The methods include preparing a nested void in a support structure; transferring at least a portion of a sample into the nested void; and milling material from a region of the support structure that defines the nested void. Milling the material from the region of the support structure causes at least some of the removed material to redeposit to form an adhesive bond between the sample and a remaining portion of the support structure. In various embodiments, the sample can then be investigated using one or more of serial section tomography of the sample, enhanced insertable backscatter detector (CBS) analysis of the sample, and electron backscatter diffraction (EBSD) analysis of the sample.

A system for estimating a property of a region of interest includes an acoustic measurement device including a transmitter configured to transmit an acoustic signal having at least one selected frequency, the acoustic signal configured to penetrate a surface of a wellbore in a formation and produce internal diffuse backscatter from formation material behind the surface and within the region of interest, and a receiver configured to detect a return signal from the region of interest and produce return signal data. The system also includes a processing device configured to receive the return signal data, process the return signal data to identify internal diffuse backscatter data indicative of the internal diffuse backscatter, calculate one or more characteristics of the internal diffuse backscatter, and estimate the property of the region of interest based on the one or more characteristics of the internal diffuse backscatter.

An object of the present invention is to provide an optical transmission line test apparatus and a test method capable of measuring a cumulative crosstalk of an optical transmission line in which a plurality of uncoupled multi-core fibers are connected in series from one end side with an OTDR.An optical transmission line test apparatus 301 according to the present invention measures a cumulative crosstalk of an optical transmission line 50 in which a plurality of uncoupled multi-core fibers 50-i are connected in series. The optical transmission line test apparatus 301 includes a test light input unit 10 that inputs optical pulses to each of cores of the uncoupled multi-core fiber 50-1 at one end 50a of the optical transmission line 50; a reception unit 20 that receives backscattered light for each of the cores output from one end 50a; and a calculation unit 30 that acquires a loss distribution occurring in each of the cores from the backscattered light, and calculates the cumulative crosstalk from a connection loss at a connection point zj of the uncoupled multi-core fiber obtained from the loss distribution and a known inter-core mode coupling of each of the uncoupled multi-core fibers 50-i.

Described herein is a retroreflective underwater backscatter node comprising a receiver that receives an incoming acoustic signal from a first direction; a reflector that reflects back an incoming acoustic signal in a second direction; and a modulator coupled to the reflector to modulate the reflected incoming acoustic signal as a back-scattered signal. In some embodiments, the first direction and second direction are substantially the same such that the retroreflective underwater backscatter node retro-directs an incoming acoustic signal as a back-scattered signal and incoming and back-scattered acoustic signals propagate in the same but substantially opposite directions.

The invention relates to a backscatter laser spectrometry device (1) comprising a laser source (30), an optical focusing system (50), an optical separator (60), and a spectrometer (80). According to the invention, the spectrometry device comprises a beam splitter (40) arranged on an optical path of the source light beam upstream of the optical separator, wherein the optical focusing system is arranged and configured to focus a first and a second secondary excitation light beam (402, 404) onto a first and a second measurement point (202, 204), respectively, wherein the optical focusing system is adapted to collect a first and a second backscattered light beam (412, 414), respectively, wherein the optical separator is adapted to direct the first and the second backscattered light beams toward a first and a second point (822, 824) at the entrance of the spectrometer, respectively, and wherein the spectrometer directs the first and the second backscattered light beams onto a first and a second zone (842, 844) on the multichannel detector, respectively.

A tricyclodecanedimethanol composition is provided. Applications using the above tricyclodecanedimethanol composition are also described. [Solution] A tricyclodecanedimethanol composition comprising tricyclodecanedimethanol, wherein the 173° backscatter intensity T1 measured at a temperature of 25°C using a dynamic light scattering measurement method of the tricyclodecanedimethanol composition is equal to that of a standard sample (D 50 A tricyclodecanedimethanol composition that satisfies the following condition: when the backscattering intensity of a 0.002 volume% aqueous suspension of latex with a wavelength of 300 nm is T2, T2÷8.0 ≤ T1 ≤ T2×5.0.

The invention relates to a backscatter laser spectrometry device (1) comprising a laser source (30), an optical focusing system (50), an optical splitter (60), a spectrometer (80).According to the invention, the spectrometry device comprises a beam splitter (40) disposed on an optical path of the source light beam upstream of the optical splitter, the focusing optical system being arranged and configured to focus the first, respectively second, secondary excitation light beam (402, 404) onto a first, respectively second, measurement point (202, 204), said focusing optical system being adapted to collect a first, respectively second, backscattered light beam (412, 414), the optical splitter being adapted to direct the first, respectively second, backscattered light beam to a first, respectively second, point (822, 824) of the spectrometer inlet, the spectrometer directing the first, respectively second, backscattered light beam onto a first, respectively second, area (842, 844) of the multichannel detector. Figure for the abstract: Fig. 1.

The application relates to the field of optical measurement, and discloses a backscattering stray light detection device and method, wherein the light beam emitted by a light source module is processed by a light beam processing module, and a light splitting panel divides the light beam into a transmission light beam and a reflection light beam. The transmission light beam enters a unit to be measured to generate backscattering stray light, and the reflection light beam is absorbed by a light absorption module to prevent the reflection light beam from interfering with the measurement result. In addition, a light beam collecting module collects the backscattering stray light returned from the unit to be measured, and the backscattering stray light is detected by a detector module. The design not only reduces the influence of external stray light, but also improves the sensitivity and accuracy of detection through the synergistic effect of the light absorption module and the light beam collecting module, and can improve the detection level to 10 ‑10 W orders of magnitude, providing more accurate data for gravitational wave measurement, and improving the accuracy and reliability of gravitational wave detection.

A laser beam sensor system comprising a lidar system in an aircraft and a controller. The lidar system is configured to emit a laser beam into an atmosphere during flight of the aircraft. The lidar system is configured to receive backscatter light generated in response to emitting the laser beam. The lidar system is configured to generate backscatter data using the backscatter light. The controller is configured to control the lidar system to move the laser beam to scan an area using a path from a central location to an outer location of the area. The controller is configured to adjust a number of scan parameters during scanning the area using the path. The controller is configured to generate measurements of the area using the backscatter data generated from scanning the area.

A laser unit (2) is disclosed which comprises: a laser source (50) for producing a laser beam (51) along a beam path; a frequency stabilisation unit (65) which receives a portion of light from the laser source (50) to enable it to stabilise the frequency of the laser beam (51); at least one optical component (F1, F2) in the beam path which produces undesirable back scattered light in use; and a polarisation rotator (66) arranged in the beam path for rotating the polarisation of the back scattered light relative to the polarisation of light in the laser beam (51) to reduce the effect of the back scattered light on the operation of the frequency stabilisation unit (65). A laser encoder system is also disclosed which uses such a laser unit (2).

Embodiments are provided to facilitate X-ray backscatter imaging of equipment that is covered by insulation or other materials that it is undesirable to remove and / or that is difficult to access (e.g., due to distance from the ground and / or catwalks or other support structures). These embodiments include improved collimators or other elements to facilitate scanning of the X-ray beam in at least one direction while also maintaining a low size, weight, and power (SWaP). These embodiments also include improved detectors to more readily allow improved X-ray backscatter images and material composition (including detection of the presence of oxides or other evidence or corrosion or degradation) to be detected, even in SWaP-limited applications like remote vessel inspection.

To determine the amount of displacement of a vehicle's body frame using optical fiber sensing. [Solution] The identification device according to the present disclosure comprises: communication means for receiving backscattered light from an optical fiber installed in a vehicle; detection means for detecting the magnitude of strain generated at each position on the optical fiber using the backscattered light; and identification means for maintaining a correspondence table that associates positions on the optical fiber with positions on the vehicle body frame, and for identifying the amount of displacement at each position on the vehicle body frame using the magnitude of strain at each position on the optical fiber and the correspondence table.

This invention relates to an adaptive correction method for multi-beam backscattering based on statistical change point detection, belonging to the field of marine acoustic detection and seabed sediment information processing technology. The method includes acquiring multi-beam data and constructing a proxy signal; adaptively grouping the proxy signal sequence using a bisection change point detection algorithm; statistically processing the backscattering intensity data within each group according to the beam incident angle; smoothing the average angle response curve using a smoothing filter; unsupervised partitioning based on curvature and clustering; and constructing a piecewise angle response reference model, using this model to calculate the correction value. This invention effectively weakens the central highlighting, edge attenuation, and striped structure caused by angle response effects, reduces the block effect or mosaic phenomenon common in fixed window methods, and effectively weakens the systematic correlation between backscattering intensity and incident angle, providing a more stable and reliable data foundation for subsequent seabed sediment classification, seabed geomorphological identification, and related marine survey applications.

Aspects of the subject disclosure may include, for example, determining distinct timing offsets between an input port and output ports of a multiport optical device. An optical signal is injected at an input port of the device to obtain output signals at the output ports, which are injected into downstream fibers. An optical multipath return signal is received via the input port of the device, including a combination of measured events including reflections, backscatter, or both. A number of similar events expected in the number of downstream optical fibers is calculated to obtain an expected multipath signature based on configuration data. Results of the optical multipath return signal are then compared to the expected multipath signature to obtain comparison results. One of the measured events is distinguished from the others based on the first comparison results and the distinct timing offsets. Other embodiments are disclosed.

The present disclosure provides a backscatter detector, including: a plurality of detector modules arranged at different positions, where ray signal channels are independent of each other, where detection region areas of at least two first detection modules among the plurality of detector modules are different from each other, and the detection region area of each of the at least two first detection modules is adapted to a respective target first count rate. The present disclosure further provides a backscatter detection apparatus.

A computer-implemented method is provided. The method comprises receiving (S1) vibration data (VD), wherein the vibration data (VD) is inferred by back-scattered laser light from a fiber optic cable (21) and contains information of vibrational energy at a plurality of measurement segments (22, 23) of the fiber optic cable (21); determining (S2) whether a vibrational energy change during a recent time window (Δtr) in at least one measurement segment exceeds a predefined amplitude; if the predefined amplitude is exceeded, determining (S3) whether the vibrational energy change in the at least one measurement segment (22, 23) exceeds a predefined duration (D), and / or whether the vibrational energy change for measurement segments in proximity to the at least one measurement segment (22, 23) exceeds a predefined spatial extent (SE), thereby determining whether a data cluster (DC) representing the vibrational energy change is present in the vibration data (VD); and providing (S4) an event signal (ES) for the case that such data cluster (DC) is identified in the vibration data (VD). Further, a data processing system and a computer program product are provided.