1563 results about "Light detection" patented technology

Disclosed herein is a sensor device for volumetric capnography. The sensor device is coupled to an adapter comprising a housing that encloses a measurement volume. The adapter is configured for gas flow along a first length axis, which aligns with a second length axis of the sensor device. The device includes an IR light source and an IR light detector, positioned on opposite sides of the housing. The IR light source emits IR light toward the detector across the measurement volume. The sensor device also includes a first ultrasonic transceiver in contact with the adapter and configured to emit ultrasound centered at a first position along the second length axis, directed partly along the axis and partly transversely. A second ultrasonic transceiver, also in contact with the adapter, emits ultrasound centered at a second position along the second length axis, directed partly opposite to the first direction and partly transversely.

The invention discloses a multi-mode end point detection system and method for a semiconductor dry process, and relates to the field of gas concentration detection. A gas absorption cell; the reference light path adjusting unit comprises an adjustable attenuator used for adjusting signals; the first photoelectric detector is used for detecting a transmission signal; the second photoelectric detector is used for detecting a reference signal; the lateral scattered light detector is used for detecting a scattered signal of the particulate matters in the gas absorption tank; and the signal processing unit is in signal connection with the first photoelectric detector, the second photoelectric detector and the lateral scattering light detector and is used for performing compensation calculation on the transmission signal based on the reference signal and the scattering signal so as to obtain a corrected gas absorption signal. By adopting the scheme, measurement signal distortion caused by optical mirror surface pollution and particulate matter scattering interference in a semiconductor tail gas optical detection technology is avoided.

The invention discloses an on-line light detection device for coated glass production, and relates to the technical field of glass detection, the on-line light detection device comprises a first conveying roller group and a second conveying roller group which are used for transversely conveying coated glass, and an interval exists between the first conveying roller group and the second conveying roller group; the lifting adjusting assembly is arranged at the interval, is close to the first conveying roller group, is used for adsorbing the coated glass from the first conveying roller group and can perform lifting motion; the deviation rectifying and centering assembly is arranged at the interval, is close to the second conveying roller set and is used for driving the coated glass adsorbed by the lifting and adjusting assembly to rotate and longitudinally move, and deviation rectifying and centering of the coated glass are achieved in the process; the light detection assembly is arranged above the adsorption area of the lifting adjustment assembly, and the follow-up detection precision can be improved conveniently by conducting flexible position adjustment on the coated glass in advance.

An optical frequency domain reflectometer with environmental disturbance resistance and large strain measurement capability belongs to the field of distributed optical fiber sensing and comprises an opposite sweep frequency light frequency modulation continuous wave signal generation module, a light splitting device, a modulation device, a circulator, a polarization controller, an optical coupling device, a photoelectric conversion module and a data acquisition and processing module. An optical signal generated by an opposite sweep frequency light frequency modulation continuous wave signal generation module is divided into probe light and local oscillation light through a light splitting device, the probe light is modulated through a modulation device and sent to an optical fiber through a circulator, and a Rayleigh back scattering light signal generated by the optical fiber and the local oscillation light interfere in an optical coupling device to obtain interference light; the photoelectric conversion module mixes beat frequency signals of interference light, and the data acquisition and processing module analyzes and processes the beat frequency signals. According to the invention, the position information of the Rayleigh backscattering point is marked by using the modulated probe light, the Rayleigh scattering signal at the corresponding position is restored, crosstalk between channels is inhibited, and high-precision measurement in a large dynamic range and resistant to environmental disturbance is realized.

The invention discloses a switch cabinet electric arc light detection method and system based on multispectral fusion, and relates to the technical field of electric power system intelligent detection, and the method comprises the following steps: S1, building a cross-spectrum unified time reference, and carrying out the synchronous comparison of an infrared light signal, a visible light signal and an ultraviolet light signal, extracting a temperature transition trigger feature and a strong light disturbance spectrum feature, and generating a time synchronization deviation vector; and S2, constructing an anti-fact spectrum playback model based on the time synchronization deviation vector, generating a shadow spectrum sequence, positioning an infrared response threshold lifting reason through energy difference analysis, calculating a spectrum overlapping risk interval and duration, and outputting a threshold disturbance distribution diagram. According to the method, infrared anomalies are identified through cross-spectrum time alignment, anti-fact playback and differential analysis, channel recovery is guided in combination with springback prediction and time sequence correction, and a spectrum broken chain window is constructed through dislocation sampling and phase regulation and control, so that the accuracy and the anti-interference capability of arc identification are effectively improved.

The invention provides a light source multiplexing diamond NV color center wide field detection system and an illumination detection method. The system comprises a diamond containing an NV color center, an exciting light module, a first double-color sheet, an objective lens, a second double-color sheet, a wide field imaging module, an illumination imaging module and a microwave module, exciting light generated by the exciting light module irradiates the first double-color piece, is guided to the objective lens, and irradiates the diamond after being transmitted by the objective lens so as to excite the NV color center of the diamond to generate fluorescent light; the objective lens is of an infinity type; the exciting light is irradiated to a sample to be detected after being transmitted by the diamond; fluorescent light and exciting light from a sample to be detected are collected by the objective lens, then transmitted to the first double-color piece and guided to the second double-color piece through the first double-color piece, the second double-color piece guides the fluorescent light to the wide-field imaging module for imaging, and the exciting light in the second double-color piece is guided to the illumination imaging module for imaging. Illumination can be achieved in the exciting light working state, exciting light switching operation in the prior art is avoided, and efficiency can be remarkably improved.

The embodiment of the invention discloses a scanning NV probe microscope which comprises an atomic force microscopy system used for detecting surface topography information of a sample and an optical detection magnetic resonance system used for detecting surface magnetic field distribution information of the sample, and the atomic force microscopy system comprises a vibration arm and a diamond probe. The optical detection magnetic resonance system comprises an NV color center, a transition excitation light path and a fluorescence detection light path; a sample to be scanned and the transition excitation light path are respectively positioned on two opposite sides of the diamond probe, and the transition excitation light path and the fluorescence detection light path are positioned on the same side of the diamond probe; a first metal coating film is arranged on one side, close to the sample, of the diamond probe and is used for blocking surface fluorescence of the sample. According to the scanning NV probe microscope provided by the embodiment of the invention, the metal coating is arranged at the bottom of the diamond probe to block stray fluorescence from the surface of the sample, so that the problems of low magnetic field imaging signal-to-noise ratio and limited measurement precision of the existing scanning NV probe microscope are solved.

The invention discloses a chip packaging body defect detection method, and relates to the field of chip detection.The chip packaging body defect detection method comprises the steps that a feeding position, a visible light detection position, a material connection position, an infrared light detection position and a discharging position are arranged on a rack side by side; the first conveying module lifts the carrier plate at the visible light detection position so that the scanning head can carry out line scanning imaging on the carrier plate units, the second conveying module lifts the carrier plate at the infrared light detection position so that the infrared system can carry out imaging, and physical separation and process relay of visible light and infrared detection are achieved. On the basis, position offset and surface defects are obtained based on visible light images of the carrier plate units, internal subfissures are recognized in combination with infrared images of the chip bodies, and unit-level judgment is generated by integrating multi-source results, so that the efficiency bottleneck of a traditional start-stop mode is avoided, and the coverage blind area of single-mode detection is overcome; and the takt, the integrity and the accuracy of chip packaging body defect detection under a high-productivity production line are remarkably improved.

The invention belongs to the technical field of visible light detection, and aims to realize accurate detection of multicolor visible light and monolithic integration of a multi-wavelength receiver. The invention provides a fully-integrated multicolor visible light detector based on a sub-wavelength polycrystalline silicon grating, which comprises three detectors capable of selectively detecting blue, green and red signals respectively. The principle is as follows: a one-dimensional sub-wavelength polycrystalline silicon grating in the multicolor detector is embedded in an upper SiO2 layer and a lower shallow trench isolation region to form a dielectric waveguide structure of which the middle is a high-refractive-index medium and the periphery is a low-refractive-index oxide layer. The period and the grating width of the sub-wavelength grating are changed, so that the incident polarized light and the sub-wavelength periodic structure are strongly coupled to cause a guided-mode resonance effect, and the sub-wavelength grating can be applied to a transmission optical filter. The size and the cost of the multicolor visible light communication system can be effectively reduced, and the data transmission rate of the system is greatly improved.

The invention discloses a quantum partial discharge detection system and method based on single photon measurement. The system comprises a photoelectric detection module and an information transmission and processing module which are connected in pairs. A free space light collection unit in the photoelectric detection module is used for converging photons of partial discharge radiation and guiding the collected photons to a classic weak light detection unit and a single photon detection unit respectively; the classic weak light detection unit is used for converting an optical signal into an electric pulse signal based on an internal photoelectric effect; the single-photon detection unit is used for detecting extremely weak light and even single-photon events and outputting discrete electric pulse signals. The classical weak light detection unit and the single photon detection unit operate in parallel, partial discharge optical detection with a wide dynamic range and a high signal-to-noise ratio is realized through a signal fusion and processing algorithm, electromagnetic interference is effectively inhibited, and a more comprehensive and reliable monitoring means is provided for evaluation of the insulation state of power equipment.

The invention discloses a piece placing sequence mistake proofing device which comprises a multi-dimensional sensing module, an intelligent control module, a reconfigurable positioning module, an execution intervention module, a block chain tracing module and a man-machine interaction module, and all the modules communicate through an industrial Ethernet. The multi-dimensional sensing module and the intelligent control module adopt a time-sensitive network protocol to guarantee the certainty of data transmission, the multi-dimensional sensing module integrates an AI vision assembly, an ultrahigh frequency radio frequency identification read-write unit and a polarized light detection assembly, and parallel acquisition and cross validation of cutting piece multi-dimensional information are realized through a time sequence synchronous triggering mechanism. According to the method, a full-dimensional recognition system can be constructed through cooperation of multi-modal sensing fusion and an intelligent algorithm to avoid a single detection blind area, multi-variety production requirements are adapted by relying on AI incremental learning and rapid remodeling design, non-tampering tracing of quality data is realized in combination with a block chain technology, and the method is suitable for mass production. And meanwhile, reliable operation of the system is guaranteed through redundancy control and emergency design.

Example embodiments relate to light detectors for nearby object detection in light detection and ranging (lidar) devices. An example embodiment includes a lidar device. The lidar device includes a light emitter configured to emit a light signal at a first time. The lidar device also includes a light detector configured to detect the emitted light signal. Additionally, the lidar device includes a biasing circuit configured to modify a detector bias using a bias signal. The bias signal ramps the detector bias from a first bias level at the first time to a second bias level at a second time. The second time is separated from the first time by a ramp duration. The ramp duration is sufficient to prevent any internal feedback within the lidar device caused by the emitted light signal from saturating the light detector or detection circuitry associated with the light detector.

The invention provides a wide-field imaging and confocal integrated system and method for a solid-state spin color center. The system comprises an exciting light module, a wide-field branch, a confocal branch, a first guide element, a first double-color piece, an objective lens, a probe comprising a solid-state spinning color center, a first filter, a second guide element, a photoelectric detection light path, a wide-field imaging light path and a microwave module. The exciting light module outputs two paths of exciting light in a switchable mode, the two paths of exciting light are transmitted to the confocal branch and the wide-field branch respectively so as to obtain light beams meeting confocal and wide-field imaging respectively, and the two paths of light beams are guided to the same laser excitation and fluorescence detection light path through the first guiding element and then are transmitted to the wide-field branch through the second guiding element. And then the collected fluorescence is guided to a photoelectric detection light path or a wide-field imaging light path by a second guide element, so that switching of two detection modes can be realized, integration of wide-field imaging and confocal can be realized, compared with respective reconstruction in the prior art, the method is more convenient, repeated debugging in the switching process is avoided, and real-time switching can be realized.

In a general aspect, a quantum spectrum sensing system is presented. In some implementations, a system includes a laser system, a vapor cell sensor, an optical detector, and a signal processing system. The laser system includes a first laser that generates a first laser signal; a comb generator that produces a frequency comb signal based on the first laser signal; and a second laser generates a second laser signal. The vapor cell sensor includes a vapor and receives input optical signals based on the frequency comb signal and the second laser signal. The vapor cell sensor produces output optical signals based on interactions of the vapor with the input optical signals and electromagnetic radiation. The signal processing system processes the output optical signals to identifying signals in the electromagnetic radiation that are off resonance with a transition frequency between Rydberg states of the vapor.

A vehicle may include a set of wheels, a propulsion system coupled to at least a subset of the set of wheels and configured to propel the vehicle, a steering system coupled to at least a subset of the set of wheels and configured to steer the vehicle, and a braking system configured to decelerate the vehicle. The vehicle may also include a light detection and ranging (LiDAR) emitter configured to emit light into an environment external to the vehicle and a LiDAR sensor configured to receive portions of the emitted light reflected by the environment, and a processing system configured to accept, as input, a LiDAR point cloud.

Multimodal input data associated with a transportation network environment, including at least one of image data and light detection and ranging (LiDAR) data, is received. Based on an artificial intelligence (AI) component and the multimodal input data, at least one attribute set associated with at least one infrastructure asset within the transportation network environment is identified. Based on the at least one attribute set, output data associated with a multi-objective infrastructure management operation is generated. The output data is provided for display via a graphical user interface rendered by a computing device.

Provided is a low-cost light detection device with large signal detection capacity. The light detection device includes a first semiconductor substrate including a first semiconductor layer and a second semiconductor layer stacked on top of each other. The first semiconductor layer includes a photoelectric conversion region and a floating diffusion region that accumulates charges resulting from photoelectric conversion in the photoelectric conversion region, and the second semiconductor layer includes a capacitor that accumulates the charges resulting from photoelectric conversion in the photoelectric conversion region.

Provided are an imaging light detection and ranging (LiDAR) system and a design method thereof. The imaging LiDAR system includes a laser-emitting device and a laser-receiving device that conform to the principle of Scheimpflug imaging, and the laser-receiving device includes a plurality of laser-receiving units. The design method includes: acquiring a minimum detection range of a target laser-receiving unit; when a difference between the minimum detection range and a target minimum detection range is greater than a first set value, arranging a laser-receiving unit adjacent to the target laser-receiving unit; and taking the adjacent laser-receiving unit as a target laser-receiving unit, and repeating the above step to obtain a minimum detection range of the target laser-receiving unit until a laser-receiving unit with a minimum detection range that has a difference less than the first set value from the target minimum detection range is obtained.

The invention relates to the technical field of photoelectric detection, and provides a single-photon counter circuit for weak light detection based on a photomultiplier, and the single-photon counter comprises a photoelectric conversion circuit, a differential amplification circuit, a threshold comparison circuit and a signal shaping circuit. The photoelectric conversion circuit is composed of a photomultiplier, a high-voltage power supply circuit and a voltage division circuit, detects weak light signals and outputs two paths of current signals through photoelectric conversion. The differential amplification circuit carries out differential amplification on the two current signals through a differential amplifier. The threshold comparison circuit compares two input signals, filters out signals with the amplitude lower than 1 / 2 of a set threshold, and outputs a single-path effective signal. And the signal shaping circuit shapes the effective signal and finally outputs the effective signal in a TTL pulse mode. According to the single photon counter circuit for weak light detection, the background dark counting rate is low, the sensitivity is high, and the counting unit module specially used for digital pulse statistics is connected behind the single photon counter circuit for counting single photons.

An unmanned aerial vehicle (20) for inspecting linear infrastructure (60, 61) is described.The unmanned aerial vehicle (20) comprises: a camera (23), a gimbal (24) carrying the camera (23), a light detection and ranging (Lidar) system configured to scan linear infrastructure and generate 3D point cloud data, and a processing device configured to receive the 3D point cloud data from the Lidar system, analyze the 3D point cloud data to detect features of interest on the linear infrastructure, calculate, based on the detected features of interest, camera angles and / or distances to the features of interest, and generate, based on the calculated camera angles and / or distances to the features of interest, commands for the gimbal (24), wherein the gimbal (24) is configured to change the orientation of the camera (23) based on the commands of the processing device (26).

A touch sensing apparatus is disclosed, comprising a light transmissive panel that defines a touch surface, an opposite rear surface, and panel sides extending between the touch surface and rear surface. The panel sides define a perimeter of the light transmissive panel. The touch sensing apparatus comprises a plurality of light emitters and detectors arranged along the perimeter and adjacent the panel sides, a light guide arranged along the perimeter and having a first reflective surface comprising a diffusive light scattering element. The light emitters are arranged to emit a respective beam of light onto the diffusive light scattering element so as to generate propagating light that diffusively propagates above the touch surface, wherein the light detectors are arranged to receive detection light generated as said propagating light impinges on the diffusive light scattering element, and wherein the diffusive light scattering element is arranged at least partly outside the panel sides and extending at least partly above the touch surface.

A current measurement method based on a quantum technology judges the range of formant appearance after current change of a measured wire through a frequency sweep result based on feature points, adaptively locks microwave frequency for frequency sweep, reduces the time cost of the frequency sweep process, greatly compresses the microwave frequency sweep time, and improves the measurement accuracy. The quantum state signal extraction speed can be remarkably improved while the relative high sensitivity is kept, non-contact real-time current measurement is achieved, and the method is characterized by comprising the steps that an atom source is close to a measured wire to couple a magnetic field signal generated by current in the measured wire; the atomic quantum state control system of the atomic source is connected with an upper computer through an electrical integration module, based on the optical detection magnetic resonance technology, in the measurement process, feature points are selected near formants of optical detection magnetic resonance for frequency sweeping, the positions of the feature points are updated in a self-adaptive mode based on the frequency sweeping result of the feature points, and the measurement accuracy is improved. A microwave signal frequency band is adaptively matched with a formant, a current measurement value is obtained, global frequency sweeping is replaced by feature point frequency sweeping, and the measurement speed is increased.

Implementations disclosed describe, among other things, a sample inspection system that includes an illumination subsystem to illuminate a sample with a plurality of time-spaced light pulses generated, using a pulse multiplexing system, from a source light pulse. The pulse multiplexing system includes a plurality of optical loops, each deploying an optical coupler that outputs a first portion of incident light to a sample and provides a second portion of incident light as an input into the next optical loop. The sample inspection system further includes a collection subsystem to collect a portion of light generated upon interaction of the plurality of time-spaced light pulses with the sample, and a light detection subsystem to detect the collected portion of light.

The application discloses a two-dimensional magnetic field imaging method based on diamond NV color centers, comprising the following steps: generating a rough scanning path according to a region to be measured, controlling a displacement scanning unit to drive a diamond NV color center detection unit to move point by point, locking and triggering collection after reaching a position; obtaining the light detection magnetic resonance spectrum of each measuring point through light excitation and microwave sweep, and calculating the magnetic field information; identifying an abnormal region according to the rough scanning result and generating a fine scanning path, and performing fine scanning on the abnormal region; periodically returning to a reference point to collect a reference spectrum line during the scanning process, and compensating for the drift of the current batch of measuring points, and finally matching the compensated magnetic field information with coordinate information to generate a two-dimensional magnetic field distribution map. The application can improve the positioning accuracy, measurement stability and imaging reliability of two-dimensional magnetic field imaging.

Various measurement systems and methods are disclosed to enable characterizing the optical characteristics of light beams emitted by a light detection and range finding (LIDAR) system or sensor and evaluating the range finding function of user selected lidar channels while the lidar operates under a real operational condition and is exposed to a range of user defined environmental conditions.

This application relates to an integrated MEMS two-dimensional scanning detection system, a capacitance angle measurement method, and an apparatus. The integrated MEMS two-dimensional scanning detection system includes: a laser detection component and a magnetic circuit component disposed below the laser detection component. The laser detection component is an integral structure formed by connecting a scanning lens to a riveting area via a Y-shaped two-dimensional rotation axis. The magnetic circuit component is a hollow structure enclosed by two types of magnetic circuit modules, which are used to generate magnetic fields in different directional dimensions. The riveting area of ​​the laser detection component is connected to the magnetic circuit modules in the magnetic circuit component. The scanning lens is located in the cavity enclosed by multiple magnetic circuit modules, and under the drive of magnetic fields in different directional dimensions, the Y-shaped two-dimensional rotation axis drives the scanning lens to rotate in the corresponding directional dimension within the cavity. This integrated MEMS two-dimensional scanning detection system can reduce the overall size of the electromagnetic scanning mirror.

The invention relates to the technical field of power distribution cabinet alarm systems, and provides a smart power grid power distribution cabinet alarm device and a power distribution cabinet, the smart power grid power distribution cabinet alarm device comprises an environmental data detection module, an alarm module, a fire extinguishing module, an intelligent identification man-machine interaction module and a central controller with a display, the alarm module comprises an early warning module and an acoustoelectric module, the environment data detection module comprises an arc light detection module, a smoke concentration detection module, a temperature detection module and a flame detection module, and the fire extinguishing module comprises a plurality of gas fire extinguishing controllers, a plurality of gas fire extinguishers and a gas source box. The environment data detection module monitors the conditions of temperature, smoke, sparks, electric arcs, carbon monoxide, carbon dioxide and the like in the power distribution cabinet, the monitoring conditions are uploaded to the central controller after detection is completed, various data can be checked on the display, and the central controller sends instructions to the alarm module and the fire extinguishing module to cooperate with prevention alarm, rapid fire extinguishing and power distribution cabinet protection.

The application generally relates to a polarimetric wavefront light detection and ranging (PolLidar) sensor. The PolLidar sensor includes an emitter module having an optical emitter aperture, a receiver module having an optical receiver aperture, and a mirror for scene scanning. The receiver module is separate from the emitter module.

This application provides a detection device, a control method and control unit for the detection device, a lidar system, and a terminal. The detection device includes at least one laser, at least one area array detector, at least one lens assembly, at least one photodetector, and at least one microelectromechanical system (MEMS) micromirror. The lens assembly focuses the reflected light from at least one first laser beam onto the area array detector, with the reflected light from the at least one first laser beam located within the detection range of the lens assembly. The MEMS micromirror reflects the reflected light from at least one second laser beam onto the photodetector, with the reflected light from the at least one second laser beam located within the detection range of the MEMS micromirror. Specifically, the at least one first laser beam and the at least one second laser beam are emitted by at least one laser. The MEMS micromirror and lens assembly in the detection device receive the reflected light from lasers in different areas, achieving long-distance ranging through this dual-range mode.