47results about How to "Measuring equipment is simple" patented technology

Provided is a measuring device and a calibration method for optical lens distortion. The measuring device comprises a single star light simulator, an adjusting rack, a to-be-tested lens, a CCD (charge coupled device) camera, a one-dimensional air flotation turntable, an angle encoder, a computer and an optical platform. The calibration method includes the steps of using a centroid localization algorithm to determine centroid position coordinates of a star point image when the to-be-tested lens is under different fields of view, establishing a calibration model for the to-be-tested lens distortion based on the distribution of the centroid position coordinates of the star point image under the entire field of view, and realizing the calibration of the distorted to-be-tested lens. The measuring device and the calibration method for the optical lens distortion has the advantages that the device is simple; the method is convenient; measurement accuracy is high; and the optical lens distortion can be easily measured and calibrated.

The invention provides a rolling object monocular pose measurement method based on a color image, belongs to the field of computer vision and relates to a method of rolling object model pose measurement with the principle of monocular vision with combination of a self-luminous coding mark point. In the method, by means of a manner of surrounding grouped arrangement, color-coded self-luminous mark points are arranged on a surface of a to-be-measured object, and then post measurements, comprising six parameters: displacements in the directions of X, Y and Z, pitching angle, yaw angle and rolling angle. With the color-coded self-luminous mark points on the surface of the to-be-measured object as a characteristic marker, a color-coded characteristic image on the surface of the moving target is collected. Finally, on the basis of calibration by a high-speed camera, through an image processing step including recognition and extraction of the image being marked by the color-coded mark, the target position pose information of the rolling object is solved. In the method, by means of a monocular camera with combination of color image for measurement, the method is high in measurement efficiency, is simple in required equipment and is wide in available range.

The invention discloses a dual-optical-frequency-comb linear spectral encoding imaging method. According to the method, two optical frequency combs with locked repetition frequencies are used, and thetwo optical frequency combs output signal light and local oscillator light respectively. The signal light is divided into detection light and reference light. The detection light passes a spectral encoder to be focused on the surface of a sample to be measured, the sample to be measured is encoded, and then the sample to be measured and the local oscillator light are subjected to dual-optical-frequency-comb heterodyne interference. The reference light directly interferes with the local oscillator light. Two interference pulse signals are generated and are converted into digital signals by signal acquisition. Optical reference compensation detection jitter is used, and a sample absolute distance with high precision and high stability, a linear reflectivity and phase information are obtained. The sample is moved linearly, continuous measurement is performed, and a 3D topographic image and a 2D reflectance image with high precision are achieved. The dual-optical-frequency-comb linear spectral encoding imaging has the advantages of simple structure, high measurement speed, high precision, a large amount of information and high expansion.

The invention discloses a method for measuring a rolling resistance coefficient of a vehicle by adopting a load changing method. The method for measuring the rolling resistance coefficient of the vehicle comprises the following steps of: calculating to acquire a running resistance and vehicle speed curve under conditions of masses m1 and m2 of the vehicle through a road sliding test; calculating to acquire an average value of increments, caused by the change of the mass, of running resistances; and finally calculating the rolling resistance coefficient. Compared with the conventional measurement method, the method has the advantages that measurement equipment is simple, the cost is low and the precision of the measured result is high.

The invention relates to a multi-line laser radar calibration system and a calibration method. The system is characterized by comprising a horizontal levelling table, a switching frame, a reflecting target, a total station, a computer, a laser ranger and a GPS antenna; the horizontal levelling table is arranged on a support frame, a digital display level meter is configured to monitor and judge the levelling of the horizontal leveling table; the switching frame is a connecting structure connected with the laser radar in a vertical direction and a horizontal direction, and an inertia measurement unit IMU is arranged on the switching frame; the reflecting target is arranged at a relative location of the switching frame so as to form a region for constraining a laser beam; the total station is arranged between the switching frame and the reflecting target to form an elevation measurement structure; the computer is arranged on the support frame, an I/O port thereof is connected with a signal output end of the digital display level meter, the signal output end of the laser ranger, the signal output end of the total station and the signal output end of the GPS antenna, thereby forming anautomatic monitoring structure to monitor the laser reflectivity change and read and record inertia measurement unit IMU attitude angle. The system has the characteristics of being high in calibration efficiency, high in calibration precision, low in field requirement, and convenient to execute.

The invention discloses a method and a device for measuring rotation speed of a moving ball. According to the method provided by the invention, an equation or an equation set is constructed by using maximum micro Doppler frequency shift of reflection wave to calculate the rotation speed of the ball body; and the position and the movement speed of the ball body in movement can also be calculated, and data of related movement positions including height over a net of the ball body and a point of fall and data of speed are acquired by using arrival moment and the Doppler frequency shift of the reflection wave. The device comprises an emitter, one or more receivers, output equipment and a central processor. The measuring equipment is simple, and normal movement of the ball body is not affected; and an algorithm is low in complexity and convenient to quickly realize. The device provided by the invention is adopted for measurement; the measurement result is accurate; and the functions are complete.

The invention relates to a composite insulator rod core ageing evaluation method especially suitable for 110KV-voltage-class insulators. The composite insulator rod core ageing evaluation method is characterized in that infrared spectroscopic analysis is conducted on a composite insulator rod core to extract the height of the main absorbing peak of a composite insulator, a support vector machine is utilized to evaluate the ageing degree of the composite insulator rod core; for the infrared spectroscopic analysis, the composite insulator rod core needs to be made into a test sample having the thickness of 1.5 mm, the main absorbing peak contains a hydroxy group (-OH), an alkyl group (-CH3) and a carbanyl group (-C=O), the establishment of the support vector machine needs an evaluation modelfor a fixed model of composite insulator rod cores, and then model parameters are utilized to evaluate the composite insulator rod cores of the model. The composite insulator rod core ageing evaluation method can conduct classification and state assessment on composite insulators in different ageing states and guide operating maintenance workers to maintain the composite insulators.

The invention provides a rice stalk lodging resistance measuring device, relates to the technical field that materials are tested or analyzed by testing physical properties, and aims to solve the technical problem that multiple indexes of rice stalk cannot be measured in a field. The device comprises a first clamping part, a second clamping part, a tray, a rotating body and a measuring box, wherein a holding part for holding rice stalk is arranged on the first clamping part; an inclination angle sensor and an infrared emitter are respectively correspondingly mounted on both sides of the holding part; the second clamping part is provided with a moveable baffle block which is propped against the rice stalk; the infrared emitter is arranged opposite to one side of the baffle block; both the first clamping part and the second clamping part are rotationally connected with the tray; a pull rod is mounted at an end part of the measuring box; the pull rod is detachably connected with a rotating body; a tension sensor and a tension angle sensor are mounted on the pull rod; the tray is held by hand to rotate the first clamping part and the second clamping part; the outer diameter of the ricestalk is measured by the infrared emitter; the rotating body is rotated, and tension in different angles of the rice stalk can be measured by the pull rod.

The invention discloses an organic coating diffusion coefficient testing device which comprises a macromolecule box, wherein a pair of small holes are symmetrically formed in the upper parts of two sides of the macromolecule box; an electrode A and an electrode B are respectively inserted into every two opposite small holes; and the electrode A and the electrode B are connected with a high-resistance meter through leads. The invention further discloses a testing method based on the organic coating diffusion coefficient testing device. The testing method comprises the following steps: firstly, adding an organic coating to be tested into the small holes in the macromolecule box, inserting the electrode A and the electrode B, continuously supplementing the organic coating till the macromolecule box is full of the organic coating, cutting the organic coating to be tested into an organic coated layer, putting the macromolecule box filled with the organic coated layer into a medium to be tested, testing the resistance between the electrode A and the electrode B by using the high-resistance meter every 12 hours, ending the testing when the resistance is steady, and furthermore calculating the water absorption capacity of the medium, thereby obtaining a diffusion coefficient D. By adopting the organic coating diffusion coefficient testing device and the testing method, the problems in the prior art that a testing device is large in testing error and inaccurate in testing can be solved.

The invention provides a small current measurement method for the resistivity of a large size graphite electrode. The method is characterized in that the method comprises the steps that 40 to 100 A direct current output by a constant direct current source is applied to both ends of the measured graphite electrode; the reading of the current value is measured and conversed by a shunt; the voltage of the graphite electrode is measured, and the current is measured by two contact probes which impact the cylinder surface of the graphite electrode and are distributed at a certain distance through voltage drop generated by the graphite electrode; two millivolts signals representing the current and voltage are sent to a calculation display meter; calculation is carried out according to a resistivity calculation formula; and the resistivity of the measured graphite electrode is directly displayed. The current density interval is between 0.02A/cm<2> to 0.1A/cm<2>. The distance between two contact probes which are distributed at a certain distance on the cylinder surface of the graphite electrode is from 400mm to 3/4 of the graphite electrode length. The small current measurement method has the advantages of being scientific and reasonable, simple measurement device, convenient measurement, low cost, good effect and so on.

The invention relates to an optical chopper, which comprises a motor, a modulation reticle arranged on a rotating shaft of the motor and a polarizer arranged at the terminal of the rotating shaft of the motor; the rotating shaft is provided with an axial through hole. The optical chopper has the advantages that, the modulation reticle and the polarizer fixed on the rotating shaft of the motor respectively and simultaneously performs mechanical modulation to reference light and measurement light, therefore, measuring equipment is greatly simplified, and measuring accuracy and convenience are improved.

The invention relates to a linear structure light fitting plane-based robot repeated positioning accuracy measurement method. The method comprises the steps of irradiating an upper surface of a planarcooperation target with two rays of horizontal linear structure light, and extracting image coordinate; converting linear structure light image coordinate to camera system coordinate according to a geometrical relation between a camera coordinate system and an image coordinate system, performing planar fitting, and determining a position of the upper surface of the cooperation target under the camera coordinate system; calculating a normal of the fitting plane, setting the normal as a z axis of a model coordinate system, and setting a linear structure light direction of the fitting plane as an x axis of the model coordinate system, wherein the z axis is crossed with the x axis to from a y axis of the model coordinate system; forming a cross light region on the upper surface of the planarcooperation target, wherein a cross point is an origin point of the model coordinate system; and determining a rotation matrix and a translation vector according to a geometrical relation between thecamera coordinate system and the model coordinate system. By the method, on-line, real-time, automatic and non-contact measurement of robot repeated positioning accuracy can be achieved, and the method is rapid in measurement speed and good in system flexibility.

The invention relates to an electromagnetic torque change based method for nondestructive detection of defects in a conductor, and belongs to the technical fields of power, electronic industry, metallurgical industry, semiconductor material and oil energy. This method is as below: first a torque sensor is set at one side of a cylindrical permanent magnet to drive the cylindrical permanent magnet to rotate, and conductors having no defects approach the rotating cylindrical permanent magnet, so as to measure a reference curve of change of rotating angular velocity of the cylindrical permanent magnet with time; and then a plurality of calibration curves of change of rotating angular velocity of permanent magnet with defects with time are measured; the permanent magnet approaches the conductor to be measured, so as to obtain a measurement curve; and the measurement curve is compared with the calibration curves, so as to obtain defect size of the conductor to be measured. The method is suitable for conductors such as wire, tubing and sheet metal; and the conductor to be measured does not need to move, thereby simplifying measurement conditions, measurement process, measurement cost and measurement equipment; besides, the method can easily realize automation and miniaturization, and can be applied to more fields and environment.

The invention belongs to the technical field of surface roughness detection, and particularly relates to a method for measuring surface roughness based on a wavelet Brownian motion texture fusion model, which comprises the following steps: (1) acquiring a laser speckle image; (2) determining an optimal wavelet basis function; (3) determining an optimal wavelet decomposition layer number; (4) carrying out two-dimensional wavelet decomposition on the obtained laser speckle image; (5) performing modeling analysis by using a wavelet Brownian motion texture fusion method to obtain a mathematical model; and (6) substituting the surface texture characteristic parameters of the to-be-measured workpiece into the mathematical model obtained in the step (5), and calculating to obtain the surface roughness of the to-be-measured workpiece. According to the method, a mathematical model between laser speckle image texture characteristic parameters and characterization surface roughness parameters isestablished by using a wavelet and Brownian motion texture fusion method in the aspects of practice and theory, so that the surface roughness of the to-be-measured workpiece can be measured in an online, rapid and non-contact manner through a single laser speckle image.

The invention relates to an engine cylinder cover water chamber flow field visualization test method, which comprises the following steps of: preparing an engine cylinder cover test model; arranging an observation window in a flowing area on a cylinder cover; arranging a metal wire and a diode illuminating lamp which are insulated from the metallic cylinder cover at the upstream of a flow field area; running a water circulating system, discharging impurities in the water circulating system, running a water pump and adjusting flow to 0.5m/s to 1m/s; turning on a switch of a direct-current power supply with voltage being 10 to 100V and current being 0 to 1A, electrifying the metal wire to electrolyze water to generate hydrogen bubbles on the metal wire which is connected with the cathode by taking the metal wire as a cathode and the cylinder cover as an anode, and using the hydrogen bubbles as trace particles to flow and rotate with water; and illuminating the internal part of the cylinder cover by using the diode illuminating lamp, using a camera with a microspur function to capture the trace particles and recording the trajectory of the hydrogen bubbles generated by electrolyzed water in the flow field to obtain the motion trajectory of water molecules in the flow field of the cylinder cover. The engine cylinder cover water chamber flow field visualization test method has the advantages that the flowing situation of cooling water in the water chamber of the engine cylinder cover can be intuitively judged and the flowing dead zone in the water chamber of the cylinder cover is eliminated.

The invention provides an optical fiber transmission type passive pressure sensor based on a gradient refractive index lens. The problems that an existing pressure measuring device is complex in structure, large in overall size and low in measuring precision are mainly solved. The pressure sensor comprises a displacement sensing module, a C-shaped spring tube, a rotating module, a light source, an optical fiber circulator, a photoelectric conversion module and a data processing module, the displacement sensing module comprises a base, a reflecting mirror seat, a guide rail, a sliding block, a plane reflecting mirror, a lens mounting seat, a micro lens and an optical fiber; the rotating module is used for converting the deformation amount of the C-shaped bourdon tube into the displacement amount of the plane mirror on the guide rail; a light beam emitted by the light source enters the micro lens through the optical fiber circulator and the optical fiber, is transmitted to the plane mirror after passing through the micro lens and enters the optical fiber circulator again through the micro lens after being reflected by the plane mirror, and the optical fiber circulator transmits the reflected light beam to the photoelectric conversion module. The data processing module converts the optical power into a corresponding distance.