493 results about "Backscatter" patented technology

System and method for controlling electromagnetic spatial radiation over a region by coordination the utilization of multiple ambient backscatter (ABC) nodes and repositionable dynamic reconfigurable intelligent surfaces (RISs). Multiple coordinated ABCs are used to protect the region of primary use against the radiation due to the secondary users. Repositionable dynamic RISs provide more robustness to shadowing and power fluctuations in short time frame.

The invention discloses a multi-beam backscattering intensity jump correction method, which takes a multi-beam measurement strip as a unit, automatically detects backscattering intensity jump generated by factors such as equipment parameter setting through a Gaussian weighting function, and selects a moving window to perform difference compensation by using a weighted average value. And carrying out iterative detection on the repaired intensity data and repairing the jump point until the jump point converges to 0. An example calculation result shows that the method can effectively detect and repair the intensity jump in the multi-beam strip, improve the processing efficiency and quality of the backscattering intensity data of the multi-beam strip, and improve the analysis accuracy of the submarine landform of the multi-beam intensity data.

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.

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.

An air vehicle management system comprising a controller for an air vehicle. The controller is configured to determine a prediction of an acceleration using an air vehicle model system and backscatter data. The air vehicle model system is trained to predict the acceleration using the backscatter data and is generated using backscatter light detected from emitting a laser beam in an atmosphere in a direction ahead of the air vehicle. The controller is configured to determine an adjustment to a number of flight control settings for the air vehicle that reduces a stress on the air vehicle using the prediction of the acceleration. The controller is configured to adjust the number of flight control settings using the adjustment.

This application provides a sensing processing method and apparatus, a terminal, and a device. The method includes: obtaining, by a first device, a first sensing result and a second sensing result; and determining, by the first device, a first parameter based on the first sensing result and the second sensing result. The first sensing result is a measurement sensing result obtained through sensing measurement on a reference target based on a first signal, and the second sensing result is a reference sensing result corresponding to the reference target. The first parameter is used to indicate a measurement error of the sensing measurement. The reference target includes at least one of the following: a moving target within a preset range; a specified target area; or a device equipped with intelligent reflection surface or backscatter communication.

A method to perform measurements of a field is disclosed. The method includes disposing a landing dock at a target location in the field, the landing dock being coupled to a fiber optic cable for distributed fiber-optic sensing measurement, directing an unmanned aerial vehicle (UAV) to land on the landing dock, the UAV including an interrogator unit, communicatively coupling, in response to the UAV landing on the landing dock, the interrogator unit and the fiber optic cable, sending, by the interrogator unit, a light pulse to the fiber optic cable, receiving, by the interrogator unit and in response to sending the light pulse, a backscattered light signal from the fiber optic cable, and generating, by the interrogator unit and based on the received backscattered light signal, a measurement of the target location.

An alternating pulsed lidar system comprising a laser beam generator, a receiver, and an analyzer. The laser beam generator is configured to sequentially emit laser beam pulses from ports for an aircraft into an atmosphere on an alternating basis between the ports. The receiver is configured to receive a backscatter light generated in response to sequentially emitting the laser beam pulses and generate backscatter data from the backscatter light. The analyzer is configured to determine a set of parameters for the aircraft using the backscatter data.

A laser beam scanning system comprises 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; receive backscatter light generated in response to emitting the laser beam; and 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 pattern that is based on a sequence of locations in the pattern being nearest to a center of the area. The controller is configured to control the lidar system to generate measurements of the area using the backscatter data generated from scanning the area.

A method and a system for monitoring an optical transmission path in an optical transmission system. A signal is transmitted on a portion of the optical transmission path. The optical transmission path includes a plurality of portions. A clock synchronization signal in a plurality of clock synchronization signals is assigned to the transmitted signal. A backscattered signal is received. The backscattered signal is generated by the portion of the optical transmission path in response to the signal being transmitted on the portion of the optical transmission path. Based on the assigned clock synchronization signal, the portion of the optical transmission path is monitored by analyzing the backscattered signal to determine a presence of an interference on the portion of the optical transmission path.

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 relates to a pupil detection method, in particular for data glasses (10), comprising at least one scan step (30) in which a laser beam (12), in particular an infrared laser beam, is scanned over at least a large part of a visible part of a user's eye (18) by at least one laser feedback interferometry (LFI) sensor (14), in particular by means of a MEMS micromirror system (16), and comprising at least one detection step (32) in which a part (20) of the laser beam (12) scattered back from the user's eye (18) is detected by the LFI sensor (14) and converted into an electrical signal. It is proposed that in at least one recording step (34) for the detection of a pupil (22) of the user's eye (18), signal deflections (24, 50, 52) in the electrical signal, which in particular exceed a definable threshold, are recorded together with scan coordinates (α, β) associated with the respective signal deflections (24), in particular of the MEMS micromirror system (16).

A device includes a light source, a camera, a memory and a processor. The light source emits emission light to a wound at a plurality of wavelengths. The camera detects backscattered light generated based on the emission light. The memory stores instructions. The processor executes the instructions. When executed by the processor, the instructions cause the device to record an image based on the backscattered light; quantify a degree of infection of the wound based on the image, and output an indication of the degree of infection.

Integrated backscatter X-ray assemblies for detecting backscatter X-rays reflected by a target area of an article under test are disclosed. The integrated backscatter X-ray assembly includes an enclosure, an X-ray power supply, an X-ray tube, a backscatter X-ray detector and a cooling fluid. The X-ray power supply disposed within the enclosure. The X-ray tube disposed within the enclosure and operatively coupled to the X-ray power supply. The backscatter X-ray detector is disposed within the enclosure. The cooling fluid disposed within the enclosure such that the X-ray power supply, the X-ray tube and the backscatter X-ray detector are immersed in the cooling fluid. In various examples, integrated backscatter X-ray assemblies may also include a movable base and / or a mobile platform. Methods for detecting backscatter X-rays reflected by a target area of an article under test are also disclosed.

An inspection portal includes a first x-ray source configured to emit a first beam, a first backscatter detector configured to detect backscatter from the first beam, a second x-ray source configured to emit a second beam, a second backscatter detector configured to detect backscatter from the second beam, and at least one first collimator and at least one second collimator, each oriented to detect backscatter from the associated beam and to block scatter from the other beam. The first and second backscatter detectors are configured to weight signals acquired using each of their detector element based on the first and second beams. The first backscatter detector is configured to use signal processing techniques to mitigate crosstalk due to scatter from the second beam, and the second backscatter detector is configured to use the signal processing techniques to mitigate crosstalk due to scatter from the first beam.

A long range optical fiber sensor such as a distributed acoustic sensor has a sensing fiber located remotely from the interrogator, with a length of transport fiber path connecting the two. Because no sensing is performed on the transport fiber then the pulse repetition rate from the interrogator can be high enough such that the pulse repetition rate and pulse power are optimised according to the sensing fiber length and hence sensing frequency response and sensitivity are also optimised according to the sensing fiber length. In further embodiments fiber amplifiers such as erbium doped fiber amplifiers may be included in line in the transport fiber path, typically located just before the sensing fiber in the direction of pulse travel from the interrogator, to help restore the pulse signal power before it enters the sensing fiber. In yet further embodiments at least one Raman pump source can be provided to inject light pulses on to the transport fiber at a Raman pump wavelength to stimulate the generation of signal photons at the interrogator pulse wavelength via the stimulated Raman scattering (SRS) phenomenon. This helps to maintain the forward pulses and backscatter / reflection signals as they traverse the transport fiber path to and from the sensing fiber.

A lidar system based on measuring a time-of-flight, including: an emission device configured to emit light pulses towards a scene at an angle greater than or equal to 5°; a reception device including: o a photodetector configured to receive pulses reflected or backscattered by at least one element of the scene and to convert the pulses into an electrical signal, an amplification circuit configured to amplify the electrical signal, a processing unit for processing the amplified electrical signal, configured to digitize the amplified electrical signal and determine a distance from the at least one element based on the digitized amplified electrical signal, the amplification circuit including a transimpedance amplifier, a transformer including a primary and a secondary, a capacitor and an inductor arranged in series with the capacitor.

Provided are various systems and processes for improving last-mile delivery of real-time, on-demand orders for perishable goods. In one aspect, an automated vehicle (AV) comprises a body including a storage compartment for storing perishable goods. The storage compartment is accessible by a user upon authentication of the user. The AV further comprises a sensor module for receiving data for navigating the AV. The sensor module is positioned above the body on a support structure at a predetermined height above the ground, such as three to five feet. The data includes one or more of the following: audio data, video data, radio waves, and backscattered light waves. The AV further comprises an onboard computer system configured to process the data to navigate the AV along motor vehicle routes and pedestrian routes. The AV may be configured to interface with an automated locker system to retrieve or deposit the perishable goods.

A method and system for calibrating a tilt angle of an electron beam of a backscatter scanning electron microscope is disclosed, the method comprising: scanning a bare wafer at a plurality of electron beam tilt angles and azimuth angles, thereby obtaining a calibration map representing a crystal orientation of the bare wafer; selecting a tilt angle based on the calibration map and defining an expected diffraction pattern associated with the tilt angle; scanning the patterned wafer at the selected tilt angle; comparing a diffraction pattern of an image obtained from the scanning of the patterned wafer at the selected tilt angle with an expected diffraction pattern; a tilt angle of an electron beam of the BSEM tool is corrected such that a diffraction pattern of an image obtained during scanning of the patterned wafer will align with an expected diffraction pattern.

A distributed optical fibre sensor is described which is arranged to measure one or more parameters as functions of position along a sensing optical fibre that extends along a path through an environment. The sensor includes a first probe light source arranged to generate pulses of first probe light in one or more first wavelength bands, a second probe light source arranged to generate pulses of second probe light in one or more second wavelength bands separate from said first wavelength bands, a wavelength division multiplexer arranged to launch the first probe light pulses and the second probe light pulses into the sensing optical fibre for backscatter within the sensing optical fibre, and a receiver arranged to receive and separately detect both Raman shifted components of the backscattered probe light, and coherent Rayleigh backscattered components of the second probe light.

Provided are various systems and processes for improving last-mile delivery of real-time, on-demand orders for perishable goods. In one aspect, an automated vehicle (AV) comprises a body including a storage compartment for storing perishable goods. The storage compartment is accessible by a user upon authentication of the user. The AV further comprises a sensor module for receiving data for navigating the AV. The sensor module is positioned above the body on a support structure at a predetermined height above the ground, such as three to five feet. The data includes one or more of the following: audio data, video data, radio waves, and backscattered light waves. The AV further comprises an onboard computer system configured to process the data to navigate the AV along motor vehicle routes and pedestrian routes. The AV may be configured to interface with an automated locker system to retrieve or deposit the perishable goods.

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 system for measuring a target gas via laser absorption spectroscopy in an open-air configuration, comprising a mid-infrared distributed feedback interband cascade laser (mid-IR DFB-ICL) having a wavelength selected to correspond with a spectral absorption line of the target gas and first electronic circuitry to control the laser temperature, current and modulation frequency. The mid-IR DFB-ICL is mounted to a heat sink. The system includes an optical component that projects a beam of the mid-IR DFB-ICL onto a distal backscattering directionally-reflective target and an optical receiver assembly that receives a fraction of the laser light that is backscattered from the directionally-reflective target and focuses the collected light onto an uncooled photodetector having a spectral bandwidth and optical configuration selected to optimize signal-to-noise response to received laser light. The optical receiver assembly comprises a primary mirror for receiving laser light backscattered from the directionally-reflective target and focusing the collected light onto the uncooled photodetector.

The embodiment of the present application provides a backscattering method and device, the method comprising: a network device sends an excitation signal to a tag device, the excitation signal comprises a first sub-excitation signal and a second sub-excitation signal, the second sub-excitation signal occupies the same time as the first sub-excitation signal, and the phase of some symbols in the second sub-excitation signal is different from that of some symbols in the first sub-excitation signal; the network device receives an uplink signal, the uplink signal is an uplink reflection signal sent by the tag device after being transmitted through a channel, wherein the uplink reflection signal comprises a first sub-uplink reflection signal and a second sub-uplink reflection signal, the first sub-uplink reflection signal is obtained by multiplying the tag information by the first sub-excitation signal, and the second sub-uplink reflection signal is obtained by multiplying the tag information by the second sub-excitation signal; the network device performs diversity reception on the uplink signal in response to the received uplink signal. The present application can effectively improve the success rate of signal reception.

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.

Backscatter AMP device detection and characterization using Ultra Wideband (UWB) impulse radar may be provided. First, a computing device may transmit an UWB signal comprising pulses to a Backscatter Device (BKD). Next, the computing device may receive a reflection of the UWB signal from the BKD in response to the UWB signal. Then the computing device may locate the BKD using a Channel Impulse Response (CIR) of the reflection of the UWB signal.

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.

An apparatus comprising: means for receiving a proximity pathloss threshold from a network, wherein a pathloss between a passive device and a user equipment connected to the apparatus is less than the proximity pathloss threshold; means for receiving, from the user equipment, at least one measurement associated with the user equipment; means for determining a backscatter link beam direction, based at least on the at least one measurement associated with the user equipment; and means for determining an illumination power of an illumination transmission to the passive device, based at least on the proximity pathloss threshold.