Abstract: A laser radar includes: an emitter including a laser array being configured to emit a plurality of laser beams for detecting a target object (OB); a receiver including a detector array being configured to receive echoes of the plurality of laser beams emitted from the laser array reflected by the target object (OB), and convert the echoes into electrical signals, where the laser array and the detector array form a plurality of detection channels, and each detection channel includes one laser and one detector; and a processor coupled to the emitter and the receiver, and configured to read a first electrical signal of a detector of a first detection channel and a second electrical signal of a detector of a second detection channel when a laser beam emitted from the laser array.

Abstract: The present disclosure generally pertains to time-of-flight object detection circuitry for detecting a mobile phone in a hand of a user of a vehicle, the time-of-flight object detection circuitry being configured to: detect the mobile phone in the hand of the user based on a predefined reflectivity pattern being indicative of the mobile phone being at least partially located in the hand.

Abstract: Operating the LIDAR system includes transmitting a system output signal from the LIDAR system such that a sample region is illuminated by the system output signal. Different portions of the system output signal are transmitted during different data periods. The method also includes combining light that returns to the LIDAR system from the system output signal with light from a reference signal so as to generate beating signals that are each associated with a different one of the data periods. A set of multiple candidate frequencies is generated for each of the data periods. Each of the candidate frequencies for a data period represents a possible beat frequency for the beating signal associated with the data period. The method further includes using the candidate frequencies for a check one of the data periods to identify which of the candidate frequencies for a subject one of the data periods is the beat frequency for the beating signal associated with the subject data period.

Abstract: Resolution is improved while suppressing the number of light emitting elements disposed in an optical module.

Abstract: Disclosed are a green laser phase rangefinder and a ranging method, which relate to the field of laser ranging. The rangefinder includes a direct digital synthesizer (DDS), a frequency mixing filter circuit, a microcontroller unit (MCU), a first amplifier circuit, an analog switch, a first laser beam module, a second laser beam module, a second amplifier circuit, an avalanche photodiode, a third amplifier circuit and band pass filter circuit, an analog-to-digital converter (ADC) module, a receiving lens, and a high-voltage circuit. A green laser diode is arranged in the first laser beam module; and a red laser diode is arranged in the second laser beam module. In the present disclosure, the green laser diode and the red laser diode are combined to implement ranging. The present disclosure features low power consumption, low costs, and high measurement accuracy.

Abstract: Devices, systems, and methods for measurement of angles including an autocollimator based on discovery that secondary reflections from surfaces at or near a focal plane of an objective lens of the autocollimator present unwanted measurement errors, the autocollimator configured in one aspect to have a reticle and a light sensor where the reticle and/or the light sensor is tilted with respect to an optical axis to reduce or avoid a reflection of the reticle and/or the light sensor from traveling to the light sensor in order to reduce or eliminate measurement errors.

Abstract: A range imaging device includes a light source unit, a light-receiving unit, and a range image processing unit that computes a distance to an object. The range image processing unit performs multiple measurements different in relative timing relationship between an emission timing and an accumulation timing, extracts a feature amount based on the amounts of charge accumulated at the measurements, determines whether reflection light of a light pulse has been received by pixels in a single path or via multipath propagation, based on tendency of the extracted feature amount, and calculates the distance to the object present in a measurement space in accordance with a result of the determination.

Abstract: The present disclosure generally pertains to time-of-flight demodulation circuitry configured to: determine a light event pattern with an event-based light detection element of a plurality of event-based light detection elements; and determine, for a demodulation element of a plurality of demodulation elements, a timing for a demodulation signal to be applied to the demodulation element based on the light event pattern, wherein the demodulation element is associated with the event-based light detection element.

Abstract: A LIDAR apparatus includes a light source module configured to generate light, an optical transmitter configured to transmit the light generated by the light source module to outside, an optical receiver configured to receive light coming from the outside, an optical detector configured to detect the light received by the optical receiver, and a processor configured to control the operation of each of the light source module and the optical transmitter, wherein the light source module includes a first tunable laser light source configured to emit light in a first wavelength band, a second tunable laser light source configured to emit light in a second wavelength band different from the first wavelength band, and a light selection element configured to select and output one of the lights emitted by the first tunable laser light source and the second tunable laser light source.

Abstract: A monitoring system according to the present disclosure includes: a straight line calculation unit configured to calculate a straight line connecting three-dimensional coordinates of a light source and three-dimensional coordinates of a three-dimensional measuring device configured to measure a target to be measured; an invalid region determination unit configured to define a three-dimension invalid region in which point cloud data acquired by the three-dimensional measuring device is invalid based on the straight line; and a point cloud data processing unit configured to monitor the target to be measured based on the acquired point cloud data and the three-dimension invalid region.

Abstract: An alignment device for aligning a wafer handling robot in a wafer processing system includes a substrate having a through-hole. A sensor is mounted on a first surface of the substrate, and configured to capture, via the through-hole, information relating to a position of the alignment device in the wafer processing system. A transmitter is mounted on the first surface of the substrate and coupled to the sensor. The transmitter is configured to wirelessly transmit the information captured by the sensor. The transmitted information enables to determine whether the alignment device is within a threshold distance from a target position in the wafer processing system and to adjust the position of the alignment device. A method of aligning the wafer handling robot utilizing the alignment wafer, and a frame and method for calibrating the alignment wafer are also provided.

Abstract: Disclosed are a gain adjustment method and an optical fiber amplifier. The gain adjustment method is applied to an optical fiber amplifier at least including a gain medium, a dynamic gain equalizer and a control unit. The method is performed by the control unit, and includes: determining a property parameter of the gain medium and a current attenuation spectrum of the dynamic gain equalizer; determining, in a preset gain attenuation-spectrum library, a gain attenuation-spectrum mapping table corresponding to the property parameter, wherein the gain attenuation-spectrum mapping table includes a mapping relationship between each gain of the optical fiber amplifier and one attenuation spectrum of the dynamic gain equalizer; obtaining a target gain of the optical fiber amplifier; determining a target attenuation spectrum in the gain attenuation-spectrum mapping table according to the target gain; and adjusting the current attenuation spectrum to the target attenuation spectrum.

Abstract: A light detecting device includes a reception optical system that guides a reflected beam along a reception optical axis and a light receiver that outputs a detection signal by receiving the reflected beam. The light receiver forms a reception surface having a reception aspect ratio in which a long side extends along a first reference axis orthogonal to the reception optical axis. The reception surface is inclined around the first reference axis with respect to a second reference axis orthogonal to the reception optical axis and the first reference axis.

Abstract: A depth camera assembly (DCA) is described. The DCA includes a projector, a sensor, and a controller. The projector is configured to dynamically illuminate one or more regions of a local area. The sensor is configured to detect light from the illuminated one or more regions using one or more subsets of a plurality of light sensors. The controller is configured to instruct the projector to illuminate a first region of the local area, and determine a first subset of the one or more subsets. The controller is configured to instruct the sensor to use the first subset to detect light, and the first subset captures light from a first portion of the first region of the local area. The controller is configured to determine depth information for the first region based in part on the detected light from the first portion of the first region.

Abstract: Reticles, autocollimators, systems, and methods for measurement of angles including a reticle having at least one line which produces a line image on a sensor where the line image is mismatched with respect to vertical and horizontal reference lines of pixels of the sensor such that periodic measurement error due to regular spacing between pixels is reduced or eliminated. In aspects an autocollimator includes a reticle comprising a pattern having a first line with a slope and a second line with an inverse of the slope, the lines being other than parallel.

Abstract: According to a method for verifying the functionality of a laser scanner (2b) comprising a housing (4) with a light-permeable window (5), a transmission unit (6) inside the housing (4), a deflection unit (10), and a detector unit (7) inside the housing (4), at least one test signal (15) is transmitted by the transmission unit (6) during a test phase. The deflection unit (10) is oriented in such a way that the at least one test signal (15) is not directed to the window (5). Components of the at least one test signal are detected by the detector unit, and based on said detection, at least two detector signals are generated. A computing unit ascertains a pulse width for each of the detector signals and calculates a sum of the pulse widths. The operability of the transmission unit and/or the detector unit is verified on the basis of said sum.

Abstract: An active sensor system (1) has a first and a second emitter unit (2, 2?), as well as a detector unit (3, 3?) and a computing unit (4). The emitter units (2, 2?) are configured to emit respective measurement signals into corresponding emission spatial regions (A1, A2). The detector unit (3, 3?) is configured to generate at least one detector signal on the basis of reflected portions of the measurement signals, and the computing unit (4) is configured to generate a measurement data set on the basis of the at least one detector signal. The computing unit (4) is configured to identify at least one section (T1, T1?, T2) that is shaded with respect to at least one of the emitter units (2, 2?). The computing unit (4) is configured to generate the measurement data set taking into account the section (T1, T1?, T2) and/or to generate correction data for correcting the measurement data set.

Abstract: The disclosure provides different time of flight, ToF, methods and systems for using two or more non-sinusoidal control signals to achieve modulated output light and/or image sensor control with reduced harmonic content. In particular, the two or more non-sinusoidal control signals have different relative phase offsets or duty cycle ratios such that a combined signal resulting from combing the two or more control signals has reduced harmonic content. By utilising non-sinusoidal signals and effectively making using of the combined signal for the output light and/or image sensor control, the system is more straightforward and lower cost to implement compared with systems that use sinusoidal control signals, whilst still maintaining accuracy of the system by minimising the harmonic noise normally associated with non-sinusoidal signals.

Abstract: A surveying device embodied as total positioning system or total station, wherein the surveying device comprises a laser distance measuring module configured to generate a distance measuring beam for a single point measurement to determine a distance to a measurement point targeted by the distance measuring beam. Furthermore, the surveying device comprises a range imaging module with a switchable target illuminator for providing different distance-dependent illumination states of an area illumination comprising a broad and a narrow illumination state.

Abstract: Apparatus and associated methods relate to improving measurement of metrics determined by laser air-data systems subject to unwanted background light. Such measurements are improved by estimating and excising the unwanted background light from the total light received by an optical receiver which receives a Doppler-shifted reflected portion of a projected beam of light backscattered by aerosols and air molecules of an atmosphere. The background light is estimated using a background-light rejection filter that separates the light received by the optical receiver into a beam sampling portion and a complementary non-beam portion. The beam sampling portion has band-pass wavelengths that include the Doppler-shifted reflected portion and a portion of the unwanted background light. The complementary non-beam portion includes background light of wavelengths outside of the band-pass wavelengths of the beam sampling portion.