Abstract: The optical distance measurement device is configured to include an optical interference unit for separating the reflected light into a reflected light of a first polarized wave and a reflected light of a second polarized wave, extracting first and second components orthogonal to each other from an interference light of the reflected light of the first polarized wave and the reference light, and extracting third and fourth components orthogonal to each other from an interference light of the reflected light of the second polarized wave and the reference light, and a polarization rotation unit for acquiring one or more components of horizontal and vertical components of a polarized wave by rotating a polarization angle of a first complex signal having the first and second components and a polarization angle of a second complex signal having the third and fourth components, so that a distance calculation unit calculates, on the basis of the components acquired by the polarization rotation unit, a difference bet

Abstract: A method includes counting a first set of photons having times of flight that falls within a first time range and being detected during a first time period, determining a second time range based on the first set of photons, the second time range being smaller than the first time range, counting a second set of photons having times of flight that fall within the second time range and being detected during a second time period, and determining a third time range based on the second set of photons, the third time range being smaller than the second time range.

Abstract: A light-source device includes a plurality of light emitters; and a plurality of optical elements through which laser beams emitted from the plurality of light emitters pass. The plurality of optical elements includes: a first optical element configured to emit a laser beam of a first divergence angle; and a second optical element configured to emit a laser beam of a second divergence angle smaller than the first divergence angle.

Abstract: A signal processing device (1) includes a first medium (2), a second medium (3) and a lipid interface (4) arranged between the first medium and the second medium. The lipid interface includes multiple lipid molecules (5). An input transducer (8) is arranged to apply an input signal to the lipid interface to generate a mechanical pulse in the lipid interface. An output transducer (9) is arranged to receive an output signal by detecting a mechanical response (14) in the lipid interface from the mechanical pulse generated in the lipid interface by the input transducer.

Abstract: In some embodiments, a ToF sensor includes an illumination source module, a transmitter lens module, a receiver lens module, and an integrated circuit that includes a ToF imaging array. The ToF imaging array includes a plurality of SPADs and a plurality of ToF channels coupled to the plurality of SPADs. In a first mode, the ToF imaging array is configured to select a first group of SPADs corresponding to a first FoV. In a second mode, the ToF imaging array is configured to select a second group of SPADs corresponding to a second FoV different than the first FoV.

Abstract: Systems and methods for determining a location of an object within a sonar beam zone are detailed herein. A system for presenting marine data includes at least one sonar transducer associated with a watercraft, a display, processor(s), and a memory including a computer program code. The sonar transducer emits sonar beams into an underwater environment defining a beam shape. The program code, when executed, causes, on the display, presentation of a chart and a representation of the watercraft; and determines, based on the beam shape corresponding to the sonar transducer, a sonar beam zone corresponding to a sonar coverage of the underwater environment of the body of water. The program code further receives sonar return data and determines a position of an object within the sonar beam zone, and causes, on the display, presentation of the sonar beam zone and an indication of the object within the sonar beam zone.

Abstract: A method of operating a light detection and ranging (LIDAR) system is provided that includes generating a beam of polarized light; and transforming a polarization state of the beam of polarized light at a rate faster than a rate of data collection at a plurality of detectors configured to detect light reflected from a target for the purpose of speckle-reduction.

Abstract: In one embodiment, a lidar system includes a light source configured to emit (i) local-oscillator light and (ii) pulses of light, where each emitted pulse of light is coherent with a corresponding portion of the local-oscillator light. The lidar system also includes a receiver configured to detect the local-oscillator light and a received pulse of light, the received pulse of light including light from one of the emitted pulses of light that is scattered by a target located a distance from the lidar system. The local-oscillator light and the received pulse of light are coherently mixed together at the receiver. The lidar system further includes a processor configured to determine the distance to the target based at least in part on a time-of-arrival for the received pulse of light.

Abstract: A seismic sensor assembly can include a housing that defines a longitudinal axis; a sensor; sensor circuitry operatively coupled to the sensor; and overvoltage protection circuitry electrically coupled to the housing.

Abstract: A distance measurement device includes: a mirror disposed so as to be tilted relative to a rotation center axis; a drive unit configured to rotate the mirror about the rotation center axis; a photodetector configured to detect reflected light, of laser light, reflected in a distance measurement region; and a condensing lens disposed on the rotation center axis and configured to condense the reflected light reflected by the mirror, on the photodetector. The mirror has a shape elongated in one direction and is disposed such that a short axis thereof is tilted relative to the rotation center axis in a direction parallel to a plane including the rotation center axis. A width in a short-axis direction of the mirror is smaller than a width of a lens portion of the condensing lens as viewed in a direction parallel to the rotation center axis.

Abstract: There are provided a sound source visualization device and method. A sound source visualization device according to an embodiment includes: a sound source detection module configured to detect a sound source signal by using a plurality of sound source detection sensors; a preprocessing module configured to filter out the noise and amplify the sound source signal; a calculation module configured to calculate an approximate sound source location by analyzing the preprocessed sound source signal; a search module configured to generate a plurality of pseudo-planes by using the altitude information, to select planes, and to generate three-dimensional sound source location and altitude information by including information, obtained using the selected planes, in the approximate sound source location; and a visualization module configured to output sound source information to a preset system host or to convert this sound source information into a visualization signal and display the visualized signal.

Abstract: Systems and methods for providing a sonar beam footprint are detailed herein. A system for presenting marine data includes at least one sonar transducer associated with a watercraft, a display, processor(s), and memory including computer program code. The sonar transducer emits sonar beams into an underwater environment that define a beam shape. The program code, when executed, causes, on the display, presentation of a chart and a representation of the watercraft; determines a depth corresponding to a bottom surface of a body of water at a current location of the watercraft; and determines, based on the depth and the beam shape, a sonar beam footprint corresponding to a projection of the beam shape at the depth. The program code further causes, on the display, presentation of the sonar beam footprint on the chart so as to visually indicate sonar beam coverage.

Abstract: A surveying instrument including a light projecting optical system which projects the distance measuring light, a light receiving optical system which receives the reflected distance measuring light from an object, a frame unit 5 which horizontally rotates around a horizontal rotation shaft, a scanning mirror which is provided in the frame unit, vertically rotates, a horizontal angle detector which detects a horizontal angle of the frame unit, a vertical angle detector which detects a vertical angle of the scanning mirror and an arithmetic control module which calculates the three-dimensional coordinates of the object, in which the light receiving optical system has a reflecting mirror having a reflecting surface which is an off-axis paraboloidal surface or an off-axis free-form surface, and the reflected distance measuring light is configured to be led to a light receiving module by the reflecting mirror while being condensed.

Abstract: One example provides a method of operating a time-of-flight camera system comprising an illumination source and an image sensor. The method comprises operating the illumination source and the image sensor to control a plurality of integration cycles and a plurality of readout cycles. In each integration cycle, the method comprises performing a plurality of pulse width modulated (PWM) illumination cycles where each PWM illumination cycle is separated from one or more adjacent PWM illumination cycles by a non-illumination cycle. For each PWM illumination cycle, the method comprises directing photocharge to in-pixel memory for each pixel that is performing image integration and for each non-illumination cycle conducting photocharge away from the in-pixel memory for each pixel that is performing image integration. The readout cycle comprises, for each pixel that performed image integration, reading a charge stored in the in-pixel memory after the integration cycle.

Abstract: Multiplexed phased array sonar systems and methods for consumer fishfinders are described herein. In one embodiment a single curved transmit transducer and an array of receive transducers are provided, and in an embodiment the signals from the receive transducers are multiplexed, which greatly reduces the data load, allowing for the achievement of the near real time, high resolution imagery in a size and price point that enables this technology to be employed in a consumer fish finder.

Abstract: An underwater ultrasonic device includes a curvilinear ultrasonic transducer and a plurality of straight linear ultrasonic transducers. The straight linear ultrasonic transducers are disposed with respect to the curvilinear ultrasonic transducer. A first angle is included between the straight linear ultrasonic transducers. One of the curvilinear ultrasonic transducer and the straight linear ultrasonic transducer is configured to transmit a plurality of ultrasonic signals. Another one of the curvilinear ultrasonic transducer and the straight linear ultrasonic transducer is configured to receive a plurality of reflected signals of the ultrasonic signals.

Abstract: A manually rotatable sonar transducer mounting apparatus for mounting a sonar transducer to a boat and providing a means to mechanically rotate a submerged sonar transducer with little mechanical effort or movement and with very little sound. A method for rotating a submerged sonar transducer using the manually rotatable sonar transducer mounting apparatus.

Abstract: Integrated two-dimensional multi-beam LiDAR transmitter based on the Butler matrix, comprising an tunable laser array, a frequency modulated continuous wave modulator array, an N×N Butler optical matrix network, an N×M optical beam expanding network, an M-path phase shifter array, and an M-path two-dimensional LiDAR emitters.

Abstract: A system for classifying pulses from a sensor configured to detect one or more objects includes a processor and a memory in communication with the processor. The memory has a pulse classification module having instructions that, when executed by the processor, cause the processor to obtain a signal having a pulse and classify the pulse as one of: (1) a single object pulse indicating that the one or more objects represented by the pulse is a single object and (2) a plurality of objects pulse indicating that the one or more objects represented by the pulse are multiple objects. The classification of the pulse may utilize one or more of the following: a pulse width of the pulse, a rising slope of the pulse during a rising period, a falling slope of the pulse during a falling period, and a saturating width of the pulse.

Abstract: Disclosed are systems and methods of operation for capacitive radio frequency micro-electromechanical switches, such as CMUT cells for use in an ultrasound system. An RFMEMS may include substrate, a first electrode connected to the substrate, a membrane and a second electrode connected to the membrane. In some examples, there is a dielectric stack between the first electrode and the second electrode and flexible membrane. The dielectric stack design minimizes drift in the membrane collapse voltage. In other examples, one of the electrodes is in the form of a ring, and a third electrode is provided to occupy the space in the center of the ring. Alternatively, the first and second electrodes are both in the form of a ring and there is a support between the electrodes inside the rings.