177 results about "Angular scan" patented technology

A head-wearable display includes a collimated light source, a beam steering mechanism, and a synchronization controller. The collimated light source selectively emits collimated light. The beam steering mechanism is optically coupled to receive the collimated light and angularly scans the collimated light between beam steering states that each redirect the collimate light to a different angular direction along at least one angular dimension. The beam steering mechanism is coupled to scan the collimated light across an eyebox. The synchronization controller is coupled to the collimated light source and the beam steering mechanism to synchronize selective emission of the collimated light from the collimated light source with the beam steering states of the beam steering mechanism to repetitiously draw an image in the eyebox.

A door position control including an electric door actuator having a motor and a motor controller in communication with a system controller. A motor actuation operation is selected from a plurality of predetermined motor actuation operations to provide control signals to the motor controller for controlling actuation of the motor for control of door movement. Control of door movement is effected with reference to parameters specific to an installation location including an angular sweep of the door between open and closed positions and with reference to an available bus voltage for supplying power to the motor.

An optical analysis unit especially suitable for performing grating coupled surface plasmon resonance (SPR) imaging features a pivoting light source capable of scanning through a range of angles of incident light projected onto a stationary target sensor, such as an SPR sensor. The reflected image from the illuminated sensor is detected, e.g., by a CCD camera and the image and angular scan data are processed, for example by a fitting algorithm, to provide real time analysis of reactions taking place on the surface of the sensor.

Methods, devices and systems of an optical sensor for spatially smart 3-D object measurements using variable focal length lenses to target both specular and diffuse objects by matching transverse dimensions of the sampling optical beam to the transverse size of the flat target for given axial target distance for instantaneous spatial mapping of flat target, zone. The sensor allows volumetric data compressed remote sensing of object transverse dimensions including cross-sectional size, motion transverse displacement, inter-objects transverse gap distance, 3-D animation data acquisition, laser-based 3-D machining, and 3-D inspection and testing. An embodiment provides a 2-D optical display using 2-D laser scanning and 3-D beamforming optics engaged with sensor optics to measure distance of display screen from the laser source and scanning optics by adjusting its focus to produce the smallest focused beam spot on the display screen. With known screen distance, the angular scan range for the scan mirrors can be computed to generate the number of scanned spots in the 2-D display.

An optical apparatus compensates for imaging errors associated with the sinusoidal angular scan rate of a light beam reflected from a bidirectional scanning torsion oscillator. The compensation is achieved by a combination of pre-scan optics positioned between the source of the light beam and the scanning torsion oscillator, and post-scan optics positioned between the scanning torsion oscillator and an imaging surface of an imaging device. Based on the optical characteristics of its components, the post-scan optical system causes deflection of the light beam in the scan direction. To compensate for the sinusoidal scan rate, the deflection caused by the post-scan optical system is greater at the opposing edge positions of the imaging surface than at a central position. In this manner, the scan rate of the light beam at the first and second edge positions is substantially equivalent to the scan rate at the central position. The pre-scan optical system directs the light beam onto the reflective surface of the torsion oscillator in a manner that compensates for divergence of the light beam in the scan direction caused by the post-scan optical system.

A CT scanning system provides the ability to scan a patient's lower extremities while the patent is upright, i.e. either standing on the foot, or at least putting some load on the foot, or with the ankle at a given angle. The CT scanning system provides a generally horizontal upper support surface on which the patient's foot is supported. A gantry supporting an x-ray source and x-ray detector are rotated about a z-axis through the support surface. With the CT scanning system, the patient's lower extremities can be scanned while under load.

A radio-wave arrival-direction apparatus calculates a correlation matrix of received signals by correlation calculation between antenna elements, and calculates a noise spatial eigenmatrix, of which each row or column is an eigenvector belonging to a noise eigen-space, by eigenvalue factorization of the correlation matrix. The apparatus also factorizes a matrix including a product of the noise spatial eigenmatrix and a conjugated and transposed matrix of it to an upper or lower triangular matrix, using cholesky factorization. The apparatus calculates an angle evaluation value in a predetermined angle range of an arrival-angle evaluation function using the derived upper or lower triangular matrix, and determines an arrival angle based on the calculation result. A calculation amount in a variable angle range can be thus reduced without causing accuracy degradation of arrival direction, in an algorism requiring all angle sweep for arrival angle estimation of MUSIC method or the like.

Disclosed are a scanner and an image forming apparatus employing the same. The scanner may produce bidirectional scanning of light by oscillating a deflecting mirror about a first axis substantially parallel to the mirror surface, and may compensate for skewing of the scan lines by rotating the mirror about a second axis that is substantially perpendicular to the first axis so as to allow the light to be scanned at an angle.

The invention relates to the technical field of photoacoustic imaging and discloses a rapid photoacoustic tomography device and a rapid photoacoustic tomography method based on limited-angle scanning. The method comprises the following steps of: transmitting pulse laser into an imaging sample to generate a photoacoustic signal, acquiring the photoacoustic signal at a limited position on an arc through an ultrasonic detector unit, amplifying the signal through a signal amplifier, converting the photoacoustic signal into an electric signal through an analog / digital (A / D) converter, and finally transmitting the electric signal to an oscilloscope to finish digital signal acquisition; inputting the photoacoustic signal of the imaging sample into a computer, performing filtering and Fourier transform processing on the photoacoustic signal through the computer, extracting the frequency domain information of the photoacoustic signal according to experiment conditions, establishing a forward projection operator and a measurement matrix, and performing reconstruction imaging on the signal based on a quick thinning algorithm through the computer. The method and the device have the advantages of short signal acquisition time, high reconstruction speed, convenience in operation, high adaptability, high expansibility and the like.

Radiation scanning systems providing multiple views of an object in different planes and a reconstruction algorithm for reconstructing quasi-three-dimensional images from a limited number of views. A system may include bend magnets to direct accelerated charged particles to multiple targets in different viewing locations. Another system collimates radiation generated by a plurality of radiation sources into multiple beams for scanning an object at multiple angles. The object may be a cargo container, for example. The reconstruction algorithm uses an optimization algorithm and imaging and feasibility models to reconstruct quasi-three-dimensional images from the limited number of views.

System and method for scanning light across a light-receiving surface. A system for scanning light across a light-receiving surface to project a scanned line on the light-receiving surface has a light beam generator for generating a plurality of light beams. A scanning mechanism simultaneously scans each light beam of the plurality of light beams across the light-receiving surface to project a different portion of the scanned line on the light-receiving surface. The scanning system can be utilized in a compact laser printer capable of printing at a high rate, and in other scanning applications.

An optical scanner includes a plurality of light source units, each light source unit outputting a corresponding light beam; a light deflector having a deflecting surface that deflects the light beams output from the light source units; and a scanning optical system that condenses each light beam deflected by the light deflector onto a corresponding scanning surfaces. The light beams output from the light source units make an angle in a sub-scanning direction with respect to a normal to the deflecting surface. At least one surface of the scanning optical system has not curvature in the sub-scanning direction, and is a special surface having different tilt decentration angles in the sub-scanning direction according to a position in the main scanning direction.

A computer-implemented method of correcting for motion of a sample during OCT imaging obtains a series of cross-sectional volume scans through the sample at different positions on a first coordinate axis, obtains at least two cross-sectional alignment scans in planes intersecting said volume scans at an angle, and stores the alignment scans and the volume scans in memory. The alignment scans are matched to the volume scans at lines of intersection thereof to determine the relative displacement of the volume scans to the sample due to sample motion. The relative displacement is used to correct for motion of the sample between successive volume scans.

The invention relates to a method for achieving reflector antenna beam two-dimensional scanning. Each feed source (6) in a feed source array is connected with a power distribution network (2) through a corresponding feed channel, and each feed channel comprises an amplifier (5), a phase shifter (4) and an attenuator (3). According to the method for achieving the reflector antenna beam two-dimensional scanning, working states of the amplifiers in the feed channels are selected through adjustment of the attenuators of the feed channels, the selection of stimulation feed source positions and / or weighting of feed amplitude are / is achieved afterwards, large angle scan spans can be achieved, a reflector antenna has higher aperture efficiency, and phase weighting of antenna feed can be achieved through phase deploy of the phase shifters in the feed channels. According to the method for achieving the reflector antenna beam two-dimensional scanning, the complexity of an antenna feed system can be reduced, the aperture efficiency of the antenna can be improved, beam scanning capacity is more flexible, and reliability is higher.

The invention discloses a double frequency dual polarization wide angle scanning co-aperture phased array antenna. The antenna comprises a low frequency antenna unit and a high frequency antenna unit;the high and low frequency antennas respectively work in different work modes, a radiation aperture of each low frequency antenna unit and a sub array of the high frequency antenna are conformal, sothe finally acquired co-aperture array can realize double frequency bands, dual polarization and wide angle scanning; the low frequency antenna is a connection chamber antenna, a metal floor is with achamber, for avoiding influence of height inconsistency of the metal floor on work performance of the high frequency antenna, a reflection surface employs a selection surface with resistance frequency when the high and low frequency antennas are conformal; feed of the two-frequency band antennas are in common ground to the metal floor, feed ground connection of the high frequency antenna can be direct connection or direct communication with the metal floor through a capacitor, a resistor and an inductor. The antenna is advantaged in that double frequency dual polarization can be realized in aco-aperture antenna form, wide angle scanning can be realized without grating lobe, the structure is simple, and the antenna is easy to process and assemble.

Methods and apparatus for determining the skew angle of a digitized form scanned at an angle to the original page are described. The method determines a rotation angle and a boundary rectangle of best fit. Sections of the digital image in the form of thin strips are examined for the boundary between the page and the region of the scanned image beyond the original page. The Hough transform is employed to determined candidate edge line segments for the page from the sets of perimeter points. These line segments are then combined to select the best rectangle enclosing the page, from which the skew angle is determined. The algorithm also determines a rotated bounding box enclosing the page. An innovation of the invention is the use of fuzzy logic, whereby several candidates for perimeter points, candidate edges, and bounding rectangles are determined in each step of the computation with associated confidence values and the final skew angle is selected by choosing the bounding rectangle with the highest confidence values.

The invention which is suitable for a photoelectric detection technology provides a system and a method for surface plasmon resonance sensing detection. The system comprises: light sources for generating sensing lights; a first lens for adjusting the sensing lights into collimated lights; a polarizer for obtaining P-polarized lights in the collimated lights; a prism for receiving the P-polarized lights to irradiate the P-polarized lights onto a sensing surface; a controller for controlling the light sources to allow the light sources to be sequentially lightened at different positions of a focal plane of the first lens and sequentially irradiate each P-polarized light onto the sensing surface from different angles; and an imaging mechanism for recording the intensity distribution of lights reflected by the sensing surface. According to the invention, the light sources are sequentially lightened at different positions of the focal plane of the first lens through an electronic control mode, so the P-polarized lights are sequentially irradiated onto the sensing surface from different angles, the intensity distribution of the lights reflected by the sensing surface is recorded in real time, SPR angular scan curves of each point on the sensing surface are obtained in parallel, the stability is good, and the speed is fast.

The invention provides a stepping motor control system applied to a four-dimensional ultrasonic probe. The stepping motor control system is used for improving the compatibility capacity of an ultrasonic system on the four-dimensional ultrasonic probe. According to the scheme, the stepping motor control system comprises a transmission mechanism connected with an energy converter, a stepping motor, a driver, an FPGA chip and a main processor, and a sine table is generated by the main processor according to subdividing numbers and is sent to the FPGA chip; a pulse separation table is generated by the main processor according to a speed change angle, the scanning angle speed and the stepping angle of the energy converter and is sent to the FPGA chip; a scanning angle is sent to the FPGA chip through the main processor; the FPGA chip controls the driver to output pulse signals according to the scanning angle, the sine table and the pulse separation table, and the stepping motor and the transmission mechanism control the energy converter to rotate. Through the scheme, a CPU in the ultrasonic system can be used for carrying out high-performance data commutating, therefore, control parameters of the four-dimensional ultrasonic probe are provided for an FPGA, and the compatibility capacity of the ultrasonic system on various four-dimensional ultrasonic probes is improved.

The invention discloses an X ray multi-energy-spectrum CT (Computed Tomography) finite angle scanning and image iterative reconstruction method, which comprises the following steps that: applying theX rays of a plurality of energy spectrums to scan an object in a respective finite angel range, and obtaining the projection data of a tested object under each energy spectrum; on the basis of the projection data, independently reconstructing the image of each tested object under each energy spectrum; utilizing the consistency of the tested object and the complementarity of the reconstructed imageunder each energy spectrum, designing a combined regularization method to effectively remove an artifact caused by finite angle scanning in the reconstructed image under each energy spectrum, and calculating to obtain a high-quality reconstructed image; and therefore, applying an image domain decomposition method or a projection domain decomposition method to calculate to obtain the base materialimage or the dual-effect image of the tested object. The method is suitable for the image reconstruction of the multi-energy-spectrum CT under a finite angle scanning condition, the dosage of the X ray is lowered, scanning time is shortened, and the method has the advantages of high reconstructed image quality, high rate of convergence and the like.

Methods and apparatus for determining the skew angle of a digitized form scanned at an angle to the original page are described. The method determines a rotation angle and a boundary rectangle of best fit. Sections of the digital image in the form of thin strips are examined for the boundary between the page and the region of the scanned image beyond the original page. The Hough transform is employed to determined candidate edge line segments for the page from the sets of perimeter points. These line segments are then combined to select the best rectangle enclosing the page, from which the skew angle is determined. The algorithm also determines a rotated bounding box enclosing the page. An innovation of the invention is the use of fuzzy logic, whereby several candidates for perimeter points, candidate edges, and bounding rectangles are determined in each step of the computation with associated confidence values and the final skew angle is selected by choosing the bounding rectangle with the highest confidence values.

An angle scanning radar system having a group antenna controlled via a beam-shaping network, a coupling device that allows the group antenna to be operated for both the transmitting and receiving directions, and a device to mix radar receiving signals with radar transmitting signals to form a mixed baseband signal, and to digitally evaluate the mixed baseband signal with regard to the solid-angle information.

A scan head adjustable for optimum ergonomic scan angles. The scan head can be rotated according to a user's preferred mode such that the angle of the scan engine can be mechanically adjusted to give the optimum angle for its use. In support thereof, a cam provides sufficient action to give the optimum angle. A rotating cam pin is utilized through the cam path in accordance with a predetermined height that adjusts to specific angles of the scan engine.

A computer-implemented method of correcting for motion of a sample during OCT imaging obtains a series of cross-sectional volume scans through the sample at different positions on a first coordinate axis, obtains at least two cross-sectional alignment scans in planes intersecting said volume scans at an angle, and stores the alignment scans and the volume scans in memory. The alignment scans are matched to the volume scans at lines of intersection thereof to determine the relative displacement of the volume scans to the sample due to sample motion. The relative displacement is used to correct for motion of the sample between successive volume scans.

A compound ultrasound imaging method includes the steps of acquiring component frames with different scanline properties, such as different angles, scanline durations, control voltages, etc., and compounding them in real-time.

A nanophotonic phased array is configured to generate dynamic three-dimensional imagery when employed as an oscillatory beam-steering device. A scanning nanophotonic phased array generates programmable light fields. That is, a phased array generates reconfigurable light fields when controlled to perform an angular scan of incident illumination synchronized with respect to modulation of the incident illumination.

The invention relates to a surface plasma resonance imaging analyzer, which comprises a rotary scanning mechanism, a fixed optical system, a light emission component, an optical receiving component, a feeding system, an electric control system and a principle computer. The rotary scanning mechanism comprises a rotary platform, a prism fixing frame, at least two right-angel prisms with different base angles, an incident angle reader, a positioning groove, at least one movable positioning pin, a brake element and a transmission mechanism. The fixed optical system comprises the light emission component and the optical receiving component, the light emission component and the optical receiving component are both arranged on the same side of a first normal of a right-angle face, and the light emission component comprises a light source and is equipped with a polarization element and a light collimating element on the light path of the light source. The optical receiving component comprises a detector and an imaging element group. The feeding system comprises a sample flowing tank and a sample driving mechanism. The principle computer acquires images, incident angles and temperature and electrically controls other equipment via the electric control system. The surface plasma resonance imaging analyzer guarantees system stability, realizes wide angle scanning of incident light, and can be used for working environments such as micro high-pass analysis of various samples including complex biological samples, drug testing or screening and the like.

The invention relates to two-dimensional and three-dimensional wave equation prestacking depth migration processing during seismic data processing, in particular to a method for constructing true earth surface dip angle trace gathers of seismic data. The method comprises the following steps of (a) exciting a seismic wave on the true earth surface and calculating travel time of the seismic wave by means of a ray tracing method; (b) calculating a first incident angle of a first imaging point by means of a bending method in the ray tracing method and calculating a first reflection angle according to a velocity model of imaging space; and (c) constructing a dip angle according to the travel time, the first reflection angle, a preset angle range and a preset angle scanning interval, wherein at this time, a detector at the position of a receiving point receives reflection signals of the seismic wave changing along with the constructed dip angle to form a dip angle trace gather, and the dip angle trace gathers of other imaging points can be formed in the same way.

An optical analysis unit especially suitable for performing grating coupled surface plasmon resonance (SPR) imaging features a pivoting light source capable of scanning through a range of angles of incident light projected onto a stationary target sensor, such as an SPR sensor. The reflected image from the illuminated sensor is detected, e.g., by a CCD camera and the image and angular scan data are processed, for example by a fitting algorithm, to provide real time analysis of reactions taking place on the surface of the sensor.

The invention discloses a microscopy device for a controlled high-speed chromatography phase position. The microscopy device comprises a two-dimension scanning system, a first 4f system, a sample, a second 4f system, a piezoelectric ceramic control reflecting mirror, an optical path difference, a second polarization splitting prism, a polarizing film and a CCD (charge coupled device), wherein the two-dimension scanning system, the first 4f system, the sample and the second 4f system are successively arranged along a sample light path; the piezoelectric ceramic control reflecting mirror is arranged on a reference light path, and the optical path difference is used for changing the sample light path and the reference light path; the second polarization splitting prism is used for enabling the sample light and the reference light to become a bundle; the polarizing film and the CCD are successively arranged along an emergent light path of the polarization splitting prism. The invention also discloses a microscopy method of the controlled high-speed chromatography phase position. The microscopy device provided by the invention has the advantages that the system stability is high, the controllability is strong, the economy is good, the complicated angle scanning is realized, and the speed of a chromatography phase position microscopy system is increased by more than 4 times.