161results about "Using optical means" patented technology

A system enables indirect determination of a position vector (V_R) of a point position (P). The system uses two fixed trackers (10 and 10′) whose absolute positions are known. A movable measuring device (20) provides a rigid rod (25) supporting a pair of reflectors (30 and 30′) which are mounted at fixed positions. A reference point (R) is mounted at a further fixed position on the rod (25) and is on a straight line (L) through the reflectors (30 and 30′). Light beams from the trackers (10 and 10′) acquire the reflectors (30 and 30′) so that when the reference point (R) is positioned at the point position (P), the position vector (V_R) of point position (P) is determinate by vector addition.

A geometric measurement system is adapted to precisely measure one or more surfaces of objects such as corneas, molds, contact lenses in molds, contact lenses, or other objects in a fixture. The geometric measurement system can employ one or more of three possible methods of measurement: Shack-Hartmann wavefront sensing with wavefront stitching; phase diversity sensing; and white light interferometry.

The invention provides a part size measurement method based on a charge coupled device (CCD). According to the part size measurement method, feature point recognition technology is adopted, pixels are classified through feature points of a part, the size of the whole part is measured, prior knowledge of the part is not required, and measurement for the common part is achieved. According to the method, high-speed measurement is conducted, and meanwhile a precision requirement is met. The part size measurement method based on the CCD is simple in algorithm, low in cost and good in application prospect due to the facts that only the CCD and a computer are required for hardware implementation and a complex mechanical structure is not required.

The invention provides a full-automatic three-dimension characteristic extracting method. The method comprises the steps of firstly converting the three-dimension point clouds of all single view fields obtained by a stereoscopic vision measuring system into depth images of a single view field; splicing the point clouds of the single view fields; carrying out automatic searching and extracting on the corresponding depth images according to the known positioning characteristic of a workpiece to obtain the positioning characteristic of the workpiece, thus automatically converting the spliced three-dimension point clouds into the workpiece coordinate system; subsequently inputting the ideal coordinates of all characteristics to be detected of the workpiece in the workpiece design model; dividing the characteristics into a plurality of types such as aperture, tendon, plane and the like; automatically extracting the depth images respectively and obtaining the two-dimension coordinates of depth images; searching the three-dimension points of two-dimension depth image coordinates under the corresponding workpiece coordinate system; and obtaining the three-dimension information of each characteristic by calculation. The method has the characteristics of full automation, good flexibility and good expandability, and can be used for automatically extracting three-dimension characteristicsof various workpieces with known positioning characteristics.

On the basis of captured images at the time of projecting multiple-frequency slit-shaped light patterns having no overlapping edge positions onto an object, the edge portions of the slit-shaped light patterns are identified. When the edge portions overlap in the captured images of two or more slit-shaped light patterns, the reliability of the computed distance values of the positions corresponding to the edges is lowered.

The invention discloses a standard interference piece fitting method capable of acquiring film thickness and refractivity simultaneously. A to-be-detected film only needs to be coated on two standard interference pieces coated with a layer of film with already-formed interference and different refractivity. Thus, through simultaneously fitting a transmitting (reflecting) spectrum before and after coating of the two standard interference pieces, the thickness and the refractivity of the to-be-detected film can be acquired precisely at the same time, the film thickness measurement limit can be as high as 1nm, and compared with the 30nm measurement limit in the traditional method, great improvement exists. In addition, as the two standard interference pieces are fit simultaneously, errors of a test system can be greatly reduced, and requirements on performance of the test system and the cost can be significantly reduced. The method is applicable to online detection and monitoring of a film coating system and can be promoted and used in industrial production or scientific research.

A procedure for calibrating a vehicle onboard sensor 202 by facilitating the placement of a calibration fixture 110 on a floor relative to a stationary vehicle 100 using a laser emitter 102 secured to a front steerable wheel 104 of the vehicle on the same lateral side as the vehicle onboard sensor. A beam projection axis X of the laser projector is aligned at a known orientation relative to a geometric characteristic of the vehicle 100, such that the beam projection axis X is directed over a placement location P of the calibration fixture on the floor, either inherently or by guided steering of the supporting steerable wheel. A distance between the calibration fixture 110 and a reference point associated with the vehicle 100 is measured, and a current position of the calibration fixture on the floor along the beam projection axis X is adjusted as required to position the calibration fixture for calibration of the vehicle sensor 202 at a selected distance from the reference point along the beam projection axis X,

The invention relates to a control method and a system of a helicopter rotor, which belongs to the technical field of helicopter operation. The control method is characterized in that the distance changing of a blade is realized by adopting an actuator positioned on the stinger of each propeller boss to drive a flap positioned at the rear edge of the blade, so as to realize the control of a rotor system. The system comprises a demountable flap (1) installed at rear edge of the blade, torque soft propeller bosses (14), an actuator (13) installed on the stinger of torque soft propeller bosses, a flap control mechanism (1) with one end being connected with actuator (13) and the other end thereof being connected with the flap (1), and a test control system (59). The control method and the system have the advantages that the screw piston of each blade can be independently controlled, the structure is simple, the weight is light, the controllability is good, and the reliability and the security are high.

The invention is an optical fiber Prague grating sensor, characterized in that it is made by the steps of: (1) making optical fiber Prague grating; (2) making D-type section of the optical fiber Prague grating; (3) selecting rectangular ceramic substrate wider than 2cm, making two semicircular grooves at the two ends of the ceramic substrate, respectively, to fix two end points of photosensitive single-mode optical fiber in the ceramic substrate, then making an optical fiber groove to store the D-type optical fiber Prague grating in the center of the ceramic substrate by laser machining technique, where the diameter of the optical fiber groove is somewhat greater than that of the optical fiber; (4) installing the D-type optical fiber Prague grating; and (5) placing the ready-made D-type optical fiber Prague grating in the optical fiber groove and making the Prague grating located in the center of the ceramic substrate and simultaneously under the monitoring of high power microscope, assuring a plane of the D-type optical fiber Prague grating and the top end surface of the ceramic substrate are basically on the same horizontal.

The invention discloses a method and a system of gaining a three-dimensional object contour. Wherein, the method comprises: projecting structured light consisted of coding ray on a preset plane region, and picturing the structured light on the plane region to gain a standard image of the structured light having no deforming light; projecting the structured light on the three-dimensional object, and picturing the structured light on the three-dimensional object to gain a deforming image of the structured light having the deforming light; separately processing to decode for the structured light of the standard image and the deforming image and determining space position information of each part of the three-dimensional object according to position change of decoded same light in the two images, and determining the three-dimensional object contour according to the space position information. The technical scheme of the invention need not process a course of standardization and image matching and realize contour gaining of the three-dimensional object via simpler method.

The invention provides a double-fiber ball-shared coupling micro-measuring-force targeting sensor with an end face micro-structure, and belongs to the technology of precision instrument manufacture and measurement. The sensor comprises a laser device, a beam expanding collimating mirror, a fiber coupling lens, a guide pipe, a microscope objective, a CCD camera, a computer and a probe composed of an incidence fiber, a coupler and an outgoing fiber with the conical end face micro-structure. The coupler serves as a contact of the probe, and light beams are led out through the outgoing fiber with the conical end face micro-structure after being led into the coupler through the incidence optical fiber. The light beams which are led out enter the CCD camera through the microscope objective. The light spot energy center positions formed by the outgoing light beams on the CCD camera can be obtained through the image processing technology, and the targeting condition of the sensor in the space can be obtained through the one-to-one correspondence relation between the light spot energy center positions on the CCD camera and the spatial positions of sensor contacts. The outgoing fiber in the probe of the sensor is provided with the end face micro-structure, the signal to noise ratio of a detection signal is greatly increased, and the measurement resolving power of the sensor is improved.

A robotic laser-pointing apparatus has an instrument center, a first rotation axis, a second rotation axis, and a pointing axis, with the first rotation axis, the second rotation axis and the pointing axis in a known relationship to the instrument center. A laser source provides a pointing-laser beam along the pointing axis. A pointing drive system aims the laser beam by rotating the pointing axis about the instrument center in response to a pointing-direction control. Focusing optics having a focusing-optics drive serve to focus the pointing-laser beam in response to a focusing-optics control. A processor, responsive to target-position information, generates the pointing-direction control and the focusing-optics control. Some embodiments include an electronic-distance-measurement system having a measurement beam. Some embodiments provide for compensation of aiming errors of the pointing-laser beam and the measurement beam.

The invention discloses novel optical calibration equipment of a radio-frequency simulated target antenna array. The equipment is composed of a laser range-measurement system mounted on a rotary table, a video image acquisition system and a computer control and communication system, wherein the laser range-measurement system is used for measuring the distance between an antenna and the center of the rotary table; the video image acquisition system is used for obtaining an optical image of the antenna and converting the optical image into an electronic image; and the computer control and communication system is used for controlling the turning positioning of the rotary table, receiving the electronic image generated by the video image acquisition system and displaying the electronic image on a screen. Through adoption of the equipment provided by the invention, a mounting position and a spacing of a geometric center of each antenna surface meet design precision requirement, so that the difference in amplitude-phase characteristics among all paths of radiation signals of radiation interfaces of all antenna units is reduced and the fine adjustment of an electric characteristic becomes convenient so as to reach the consistency of electromechanical characteristics. Furthermore, through functions of voice communication and image transmission, workers can accurately obtain measured data and image information of the rotary table in time and the antenna can be conveniently and efficiently adjusted.

The invention discloses a machine vision-based spatial position detection system for automobile wheel planes and rims in the field of automobile industry, and aims to solve the problem that spatial positions of the automobile wheel planes and rims cannot be measured. The system comprises a first camera (1), a first line laser (2), a second line laser (3), a third line laser (4), a laser positioning seat (5), a third positioning bolt (6), a second positioning bolt (7), a first positioning bolt (8), longitudinal bubbles (9), a second camera (10), a camera frame (11), a base (12), transverse bubbles (13) and a bottom plate (14). The detection system can finish non-contact and automatic detection of the spatial positions of the automobile wheel planes and rims.

The invention discloses a tunnel rock soil deformation monitoring method, and particularly discloses a novel tunnel non-contact deformation monitoring method. A thickness R0 value of a plastic area is calculated. A sensor installing hole is drilled in a surrounding rock. One anchoring end is arranged at the tail end of an optical fiber single point displacement sensor. The anchoring end penetrates from the installing hole through the plastic area to be buried in an elastic area and fixed. The optical fiber single point displacement sensor is arranged in the plastic area. The top end, i.e. a flexible point, of a telescoping probe of the sensor is fixed on a tunnel excavation interface and used for measuring data. Deformation of the plastic area is calculated according to the value measured by the optical fiber single point displacement sensor. The monitoring data are transmitted to a tunnel port via optical fibers. During the process, consumption of manpower resource is low, the monitoring data are not manually influenced, loss and damage of the data in cable transmission can be effectively avoided, and an objective of automatic real-time monitoring can be realized via arrangement of the sensor device.

The invention discloses a system and a method for monitoring a dynamic disaster of a coal mine with fiber bragg gratings. According to the system and the method, the fiber bragg gratings (1) are distributed in or on the surface of rod bodies of anchor rods (2); the anchor robs (2) are inserted into two uppers of a roadway of the coal mine or other effective positions by drilling holes; and optical connector (11) capable of being connected with the external are introduced from the tails of the anchor rods (2), and connected with fiber bragg grating network demodulation instruments (5) which are connected to a testing computer (6) to form a testing system for monitoring the dynamic strain. With the adoption of the system and the method disclosed by the invention, the dynamic disaster can be relatively accurately forecasted, and relatively high performance of preventing outside interference can be achieved; and the method is an intrinsic safety testing method.