1335results about "Devices using time traversed" patented technology

A radar apparatus which can simply determine the sign of velocity of an object is provided. Laser light reflected by the object undergoes quadrature optical heterodyne detection performed by mixers, optical detectors, and a π / 2 phase shifter, whereby I and Q component signals are output. A frequency analyzer performs FFT on a complex signal composed of the I component signal (real part) and the Q component signal (imaginary part) to thereby obtain its frequency spectrum. Since the frequency spectrum is calculated without being folded back even in a region where the frequency is negative, the sign of the Doppler frequency fd can be determined. When the Doppler frequency fd is positive, the sign of the velocity of the object is a direction toward the radar apparatus. When the Doppler frequency fd is negative, the sign of the velocity of the object is a direction away from the radar apparatus.

In order to measure the movement of a vehicle, especially an aircraft, an imaging optical system 2 which is to be positioned on the vehicle is used to detect an image of the environment 4, and an optoelectronic shift sensor 3 chip of the type comprising an inherent evaluation unit is used to measure any shift of the image from structures thereof. The shift sensor is equal or similar to the sensor used on an optical mouse. The sensor is positioned in such a way that infinite objects are focused. The measuring signal is evaluated to indicate movements and / or the position of the aircraft. The inventive system can also be used to measure distances e.g. in order to control the flight altitude. The invention further relates to methods for automatically controlling particularly a hovering flight by means of a control loop using optical flow measurement.

A moving body measuring apparatus of the invention measures movement information of a moving body as an object to be measured. The apparatus has an optical member having a boundary surface on which light is incident, the optical member being adapted to transmit light entering the boundary surface from one side and to reflect light entering the boundary surface from the other side; an irradiation light source that emits light toward the optical member and irradiates light outgoing from the optical member onto the moving body; a camera that photographs via the optical member an image of light reflected from a reflection marker provided on a surface of the irradiated moving body; and a movement information computation portion that computes movement information for the moving body based on the image of the light reflected by the reflection marker and photographed by the camera, wherein arrangement of the irradiation light source, the camera, and the optical member is adjusted such that an outgoing angle of the irradiation light outgoing from the boundary surface substantially coincides with an incoming angle at which the light reflected by the reflection marker enters the boundary surface.

The invention relates to an expressway audio vehicle detection device and a method thereof. By the aid of the detection device, a microphone array signal acquisition module acquires an audio signal on a lane, the audio signal is subjected to band-splitting filtering and framing through a signal processing module after being subjected to de-noising processing through a noise suppression module, cross-correlation processing is conducted among sub-band signals, an audio space spectrogram is obtained, a vehicle detection module tracks a track of the maximum value on the audio space spectrogram and judges whether a vehicle passes, and the vehicle type and the vehicle speed are obtained through a vehicle type recognition module and a vehicle speed recognition module if the vehicle passes. The detection method is based on the device, a minimum statistical noise estimation method of the adaptive window length is adopted, the signal which is subjected to noise suppression processing is subjected to band-splitting filtering and framing processing, then cross-correlation processing is conducted among same sub-band signals, cross-correlation results are summed after being subjected to amplitude compression and are unfolded along a timer shaft, and an audio signal space-time spectrum is obtained. The method and the device have the advantages of being low in cost, low in energy consumption,easy to construct, interference resisting, capable of working in all weather and the like.

A system for tracking a moving magnetic target uses a magnetic anomaly sensing system to continually determine magnetic gradient tensors associated with the target and converts the magnetic gradient tensors to gradient contraction scalars. A processor uses the magnetic gradient tensors and gradient contraction scalars to determine a minimum of bearing and range to the target. A velocity of the target is determined using the determined bearing and range at two points in time as the target is moving. To continually track with the moving target, the processor determines adjustments in elevation and azimuth using the magnetic gradient tensors and gradient contraction scalars along with bearing, range and determined velocities of the target. The processor can include a routine that determines range while accounting for asphericity errors introduced by the aspherical nature of constant magnetic gradient contours associated with the target.

Photocosmetic device for use in medical or non-medical environments (e.g., a home, barbershop, or spa), which can be used for a variety of tissue treatments. Radiation is delivered to the tissue via optical systems designed to pattern the radiation and project the radiation to a particular depth. The device has a variety of cooling systems including phase change cooling solids and liquids to cool treated skin and the radiation sources. Contact sensors and motion sensor may be used to enhance treatment. The device may be modular to facilitate manufacture and replacement of parts.

In some aspects of the present application, a computer-implemented method for determining the speed of a motor vehicle in a vehicle speed detection system is disclosed. The method can include receiving a plurality of images of a motor vehicle traveling on a road, each of the images being separated in time by a known interval; determining, for each of at least two of the images, a point of contact where a same tire of the vehicle contacts a surface of the road based, in part, on one or more identified features of the vehicle in one or more of the plurality of images; and using the points of contact and the time interval separations to calculate a speed at which the vehicle is traveling on the road.

The invention relates to a vehicle anti-impact alarm method and relative system, for alarming driver to avoid impact and accidence. The output of inverter power and one end of relay is connected with an output signal interface of an intelligent camera, the picture information collecting module, vehicle character extracting module, information analyzing module, vehicle position tracking module, ranging speed measuring module and anti-impact alarm module are embedded in the chip of the camera, while the intelligent camera via a mounting support is fixed in the front windscreen glass of cabin, and said six modules should started in serially to realize the alarm method.

This invention discloses a two-phase flow digital particle image speed test method and its device, which uses suitable particles to trace flow of fluids and uses high speed CCD camera to register motion images for tracing particles, liquid drops or gas bubbles, applies an image process method to separate the images of scattered phase particles drops or bubbles from original images and extracts velocities of them from their images and applies an improved cross correlation technology based on quick Fourier transformation to extract the velocity field of the tracing particles to realize the synchronous measurement to the two phase flows with different phase velocity fields. The device includes a HeNe laser, a triple prism and a cylinder lens, a high speed CCD camera, an image collecting card and a control and image process computer.

The invention relates to a non-contact track traffic speed-measurement and positioning method based on sleeper detection and a device thereof. Sensor are installed at the bottoms of train bodies, sleepers laid on tracks in parallel are used as detected objects, the sensors are triggered to generate electric pulses when trains pass through the detected objects, and then the speed measurement and the relative positioning of the trains are accomplished according to the sequence of the triggered sensors and the time each sensor causes the rising edges and the falling edges of the electric pulses. The device comprises more than two sensors installed at the bottom of the train bodies, and measurement control units. The non-contact track traffic speed-measurement and positioning method and the device thereof have the advantages of simple and compact structure, low cost, convenient maintenance, high reliability and wide range of application.

The invention provides a measuring method based on image identification. The steps are that: shooting the images of a reference object and a to-be-detected object in the same shooting window, wherein the distance of the reference object and the shooting window and the distance of the to-be-detected object and the shooting window are the same; respectively calculating the occupied pixel number of the reference object and the to-be-detected object in the images; identifying the reference object, and acquiring the actual data of the reference object; confirming the corresponding actual data of each pixel inside the images according to the actual data of the reference data; and confirming the actual data of the to-be-detected object according to the corresponding actual data of each pixel. Due to the fact that the images of the reference object and the to-be-detected object with the same distance to the shooting window are shot in the same shooting window, according to the known actual data of the reference object and the pixel number of the reference object in the images, the corresponding actual data of each pixel in the images are calculated, and then, the pixel number of the to-be-detected object is combined, and therefore the actual data of the to-be-detected object can be confirmed.

A velocity detecting device includes an image-pattern acquiring unit that includes a laser light source and an area sensor that acquires a one-dimensional or a two-dimensional image. The image-pattern acquiring unit includes a lens between a moving member and the area sensor, irradiates a beam emitted from the laser light source to the moving member to make a scattering light of the moving member scattered from the moving member on the area sensor by using the lens, and acquires an image pattern at a predetermined time interval in association with movement of the moving member. A velocity calculating unit calculates the velocity of the moving member by computing the image pattern acquired by the image-pattern acquiring unit. The lens is a reduced optical system that projects a reduced object onto the area sensor.

A permanent magnet brushless (PMBL) servo motor test apparatus and method allow testing of a motor in place. A set of static and dynamic tests is performed to determine proper motor operation of armature windings and rotor feedback devices. The test system of the present invention displaces the motor drive system. The test system comprises an armature driver, a feedback device input, and a system controller. The armature windings of the motor-under-test are driven in a polarity sequence according to a test sequence, whereby the rotor is driven in a series of rotations. Angle feedback is tested at a plurality of said rotations. Rotor velocity outputs are tested during said rotations. Armature current and voltage are determined at a plurality of said rotations and winding balance is tested. Said power switch is also operative to apply a voltage between the armature windings and the motor case to test for fault current flow. In another embodiment of the invention, motor identification is decoded by the system into motor configuration and motor operation parameters, necessary to test the motor. Motor identification may be entered by an operator or captured from machine readable tags such as a barcode tag or an RFID tag.

An apparatus is configured for inclusion in an arrow. In one embodiment, the apparatus includes a sensor configured to provide data concerning one or more flight characteristics of the arrow in flight and a communication link coupled to the sensor, the communication link configured to communicate the data to a device external to the arrow.

A computer implemented method, apparatus, and computer usable program code for calibrating a speedometer of a vehicle. First information is received by the vehicle from a first radio frequency identification tag. Second information is received by the vehicle from a second radio frequency identification tag. A first measured speed of the vehicle is determined based on a reading from the speedometer and a second measured speed of the vehicle is determined using an elapsed time between when the first information was read and when the second information was read and a predetermined distance. The speedometer is calibrated based on a speed difference between the first measured speed and the second measured speed.

A gas turbine engine having at least a rotor shaft operatively connecting a compressor apparatus and a turbine apparatus, comprises an auxiliary gear box and a phonic wheel apparatus. The auxiliary gear box is drivingly connected to the rotor shaft and the phonic wheel apparatus includes an oil pump having toothed gear and a sensor mounted to the oil pump for sensing a rotational speed of the toothed gear.

Linear velocity sensor and method for reducing non-linearity in the output signal of the sensor are provided. The sensor comprises a ferromagnetic housing including an opening. The sensor further comprises a spool disposed in the housing. The spool includes a bore for receiving a slidable ferromagnetic rod. The ferromagnetic rod may be extendable through the opening in the housing. A magnet is mounted at the one end of the rod distal from the opening when the rod is substantially inserted in the bore. A coil is wound on the spool. The number of turns of the coil is arranged to taperingly increase as the coil progresses from an end of the spool proximate the opening in the housing to the opposite end of the spool. The tapering arrangement for the number of turns of the coil is selected to reduce non-linearity of an output signal of the coil indicative of linear velocity.

A displacement detection apparatus includes a scale 115 on which marks are disposed, first and second position detection sensors 111 and 112 detecting positions of the marks 110, and a processor 409 performing a calculation processing of an output signal from each of the first and second position detection sensors 111 and 112. The first and second position detection sensors 111 and 112 are disposed at a distance L from each other to be movable relative to the scale 115. The processor 409 calculates a correction value P′ of a mark pitch P of the marks 110 using the distance L, a first time TPK required for K marks of the marks 110 to pass a detection position, and a second time TL required for a specific mark of the marks 110, which are measured at the same time of the first time TPK, to move the distance L.

In an apparatus for measuring a natural period of liquid in a pressure chamber formed in a head device which is provided with a nozzle orifice communicated with the pressure chamber and an actuator which varies pressure of the liquid contained in the pressure chamber, a driver generates a plurality of drive signals, each of which drives the actuator to eject a liquid droplet from the nozzle orifice under a condition different from the conditions established by the other drive signals. A light emitter emits a light beam so as to intersect a space through which the liquid droplet passes. A light receiver receives the light beam which has been passed through the space. A first calculator calculates an ejection velocity of the liquid droplet based on a timing at which the actuator is driven and a change in a photo-receiving state of the light receiver, with regard to every drive signal. A second calculator calculates a natural period of the liquid based on a change in the ejection velocity which is obtained from the plural drive signals.

A instrument and method for measuring archery tackle performance is disclosed. A low power, electronics measurement unit attached onto or mounted internal to a bow in communication with a sensor which detects a signal from an external trigger mechanism mounted onto or internal to an arrow shaft for the purposes of measuring arrow velocity or collecting data indicative of arrow position. The statistical parameters of the collected data may then be used to determine and improve archery tackle performance in any shooting situation.

Systems and methods adapted for use with uncalibrated patterned surfaces for sensing any of position, displacement, velocity, acceleration, area, and volume are provided. A system includes a memory, processing electronics, and at least one readhead adapted to move relative to the surface and including a radiation source, lens, and an optical array transducer. One aspect includes generating a mapping data set representative of an intensity map of the patterned surface. Another aspect provides a variable travel speed readhead. Other aspects include multiple readheads adapted to travel in concert. Incremental and absolute sensing are provided, including systems having sub-pixel spatial resolution.

The invention discloses a high-precision speed measurement positioning method and a high-precision speed measurement positioning system for medium and low-speed maglev trains. The method comprises the following steps of: spreading metal tooth groove bars on a running track of the train, and arranging over two speed measurement positioning sensors on a train body; and cooperatively generating detection signals when the train runs and the speed measurement positioning sensors are close to the metal tooth groove bars, and judging the speed, relative position and direction of the vehicle body according to the detection signals. The system comprises the metal tooth groove bars fixed on the track, the over two speed measurement positioning sensors arranged on the train body and a signal processing unit; when the speed measurement positioning sensors are close to the metal tooth groove bars, periodic sinusoidal signals and periodic on-off signals are cooperatively generated and output to the signal processing unit; and the signal processing unit judges the speed and the position of the train body according to the received sinusoidal signals and the received on-off signals. The system has the advantages of simple and compact structure, low cost, high measurement precision, convenient installation, strong anti-jamming capability and the like.

The invention discloses a detecting method and system based on a binocular camera for real-time vehicle speed. The detecting method comprises the following steps: 1) extracting a rectangular frame and a barycentric coordinate entering a visual angle range of the binocular camera, and tracking a target vehicle; 2) recording the position and the time of a vehicle entering or leaving the visual angle range of the binocular camera; 3) pre-building a parallax depth chart of the binocular camera and a proportional relation chart of perpendicular lengths from viewpoints at the depths of the binocular camera to an optical axis and the pixel count of imagery; 4) acquiring parallax of the vehicle entering the viewpoints of the visual angle range of the binocular camera and leaving the viewpoints of the visual angle range of the binocular camera to obtain the perpendicular lengths from the viewpoints of an entering position or a leaving position of the vehicle to the optical axis; 5) calculating a traveling distance between the viewpoints of the entering position and the leaving position of the vehicle, and obtaining the vehicle speed of the vehicle according to the traveling distance and the time of the vehicle. The detecting method and system have the advantages that the speed measuring precision is high, and speed measurement can be performed on multiple vehicle objectives on multilane at the same time.

The invention discloses a parameter testing system and a parameter testing method for a high-speed moving object. The system mainly comprises a starting target, a stopping target, a data acquisition module, a master control module and a data transmission processing module, wherein each of the starting target and the stopping target consists of an X-axis and Y-axis rectangular laser light curtain emission unit, an X-axis and Y-axis photosensitive tube array and an amplification shaping unit; the starting target and the stopping target form two parallel virtual thin light curtain target surface which are at a determined interval; the data acquisition module consists of a plurality of field programmable logic arrays (FPGA) with built-in first in first out (FIFO) buffer memories; the master control module consists of an FPGA and a memory FLASH; and the data transmission processing module comprises a universal serial bus (USB) data interface and an upper computer. According to the system, the output level state of the X-axis and Y-axis photosensitive tube array at each moment when the object flies through thin light curtain areas is acquired and stored at high speed under the control of the FPGA of the master control module, and the speed of a fragment, landing coordinates and an overall dimension are calculated by data processing.

The invention discloses a vehicle detection and identification system based on a plurality of MEMS sensors and a method thereof, wherein the system can carry out real-time detection and identification for moving vehicles and has the functions of speed detection and traffic detection. The invention comprises a group of MEMS-sensors detection device used to detect moving vehicles, a power supply device used to supply working power supply for the MEMS-sensors device, a signal acquisition device used to convert analog signals output from the MEMS-sensors detection device to digital signals, a signal processing device used to carry out vehicle detection and model identification for digital signals, a display device used to display identification results. Trials verify that the invention can accurately reflect characteristics of various vehicles, can identify and display vehicle models, and can accurately display the results of speed and traffic detection. The invention is not influenced by outside weather, climate, light and other factors and has the advantages of small volume, low cost and low power consumption, thus has a wide application prospect.