35results about How to "Meet high-precision measurement requirements" patented technology

The invention discloses a method for the calibration of vectorial coordinate transformation and the modification of errors of a digital image probe, and a device thereof; the noncontact optical measurement principle is adopted to realize the precise calibration and accurate modification of errors of the image probe in high-accurate two-dimensional measurement and ensure an accurate measurement result. The method of calibration is realized completely on the basis of the measuring principle of the image probe, without the existence of the errors of calibration principle. The process of calibration is based on the self-calibration principle, a virtual calibration point is formed by fixing a target object and moving the probe, then the calibration operation is fulfilled by constructing a vector, therefore, the operability of equipment is improved; by calculating the position of the image optical centre of an probe image sensor to be taken as the calibration origin, a new measurement error caused by the offset of a coordinate system is avoided to be introduced after the multiplying power of the probe is adjusted, the requirements of measurement in different application situations are ensured, and as the probe self-calibration technology is adopted, the calibration of the probe is ensured to have very high accuracy; the error self-modification is realized by moving a precise three-dimensional moving mechanical device to extract error meshes.

The invention belongs to the field of underground tunnel environments, and in particular relates to a wireless inclination angle measurement system applied to underground tunnel detection. The wireless inclination angle measurement system comprises at least one wireless sending node and a wireless receiving node, wherein the wireless sending node consists of a micro-electromechanical system (MEMS) inclination angle sensing module, a pressure stabilizing module, an analog-to-digital (A/D) conversion module, a first micro processor, a temperature sensor, a first wireless transmitting and receiving module and a first power module; the wireless receiving node consists of a second wireless transmitting and receiving module, a second micro processor and a second power module; and the first wireless transmitting and receiving module is connected with the second wireless transmitting and receiving module through a wireless network. The wireless inclination angle measurement system can meet a measurement requirement on high precision by performing temperature compensation, filtration and interference resistance on inclination angle information in the wireless inclination angle measurement system; and tunnel structure change can be monitored accurately and effectively in real time by data transmission by the wireless network.

The invention relates to a wireless joints displacement measuring system for a metro shield tunnel. The system comprises a displacement sensor module, a temperature compensation module, a microprocessor module, a wireless transceiver module and a host computer. Through the displacement sensor module, width variation of tunnel joints can be detected at real time; and through filtering, anti-interference processing and temperature compensation, metro vibration noise and temperature influence are eliminated so as to achieve high-precision measurement requirements. In addition, by the use of a wireless network for data transmission, wiring requirements are simplified. Thus, the system is more suitable for the complex environment of an underground tunnel, and accurate, effective and real-time monitoring of tunnel structure changes is realized.

The invention relates to the technical field of calibration methods of line structured light vision systems, in particular to a laser line key point extraction method based on a plane target. The method is characterized by comprising the following steps: S1, binarization of a target image: converting a gray level image obtained by a CCD black and white camera into a binary image; S2, morphologicalimage processing: respectively carrying out corrosion and opening operation processing on the target binary image, and subtracting the result of the opening operation and the result of the corrosionoperation to remove useless information interference in the target image so as to obtain laser ray key image information; S3, Hough linear transformation: acquiring a laser line two-dimensional equation; S4, extracting of two-dimensional coordinates in the image coordinate system on the target laser line. The method has the advantages that the laser line equation extracted through the method can accurately calculate the image coordinate points on the laser line, and the measurement accuracy of the system is greatly improved.

The invention relates to a car body position detection device for car washing, which comprises a measuring device 1, a detector 3, an image processor and an electrical control module 4, and is characterized in that the measuring device 1, the detector 3 and the image processor are connected with the electrical control module 4 through lines, the measuring device 1, the detector 3 and cameras 2 in the image processor are fixed on a frame body 5, the frame body can be placed on a car washing frame 8 in a back-and-forth moving manner through a driving mechanism, and the driving mechanism 8 is connected with the electrical control module 4; the measuring device 1 comprises a transmitter 11 and a receiver 12, the image processor comprises the cameras 2 and an image recognition and operation module, the cameras 2 are fixed at the upper parts of the frame body 5 and located at two sides above an automobile 7. The advantages lie in that position values of protruding parts such as reflectors and a luggage rack on the car body contour can be measured, and measurement is performed quickly in a non-contact and automated manner; and meanwhile, the tire azimuth and the wheelbase are measured, special cleaning can be performed on tires accordingly, the head, the tail and inlet and outlet conditions of the automobile are judged, and model judgment is assisted.

The invention relates to a system calibration test method based on GNSS signal quality evaluation, which comprises a calibration device test and a receiving channel absolute time delay and variable quantity test; the calibration device test comprises a vector network analyzer time delay measurement precision test and a broadband oscilloscope time delay precision test; a vector network analyzer time delay measurement precision test specifically comprises the following steps: S1, enabling a vector network analyzer to carry out a self-calibration test; s2, according to different RF frequencies and bandwidths, straight-through vector calibration is carried out; s3, connecting the tested piece, and testing the group delay characteristic of the standard delay line; the broadband oscilloscope time delay precision test specifically comprises the following steps: generating a pulse-modulated radio frequency signal by using a vector signal source; dividing pulse-modulated radio frequency signalto two paths, wherein the one path is sent to an oscilloscope as a reference channel, and the other path is connected with a standard delay line for testing; and eliminating the influence on the stability of the whole system instrument by adopting a comparison method; The method has the advantages of being high in precision, easy to operate and high in efficiency.

The invention presents a system and a method for calibrating the angle difference of a current sensor. The method comprises the following steps: a voltage and current signal source outputs a measurement voltage signal and an excitation current signal, a current sensor to be calibrated generates a measurement current signal in response to the excitation current signal, and the measurement voltage signal and the measurement current signal are kept at the same frequency at some calibration frequency points; a voltage and current measuring instrument collects signals to complete the measurement ofphase points needing to be calibrated at the calibration frequency points; the average phase delay value of each calibration frequency point is calculated according to the input voltage and current phase difference value and the measured voltage and current phase difference value of the current sensor to be calibrated, and then, the average phase delay value of all the calibration frequency points is obtained; operation is carried out to obtain an over-determined equation group; and the over-determined equation group is solved to obtain the angle difference calibration parameters of the current sensor to be calibrated, and the angle difference is calibrated according to the angle difference calibration parameters. The problem that the precision of current measurement by a current sensor is poor due to angle error is solved.

The invention provides a fiber bragg grating clinometer, and belongs to the field of sensing technology. The fiber bragg grating clinometer comprises a shell, and an elastic beam, a force amplification component, a first magnet and a second magnet, which are disposed in the shell; the elastic beam is located at the upper part of the shell and is placed horizontally, one end of the elastic beam isconnected to an inner wall of the shell, and the other end of the elastic beam is a free end; a fiber bragg grating for monitoring the elongation of the elastic beam is attached to the elastic beam; the force amplification component is located below the elastic beam; the first magnet is located below the first magnet and is connected with the free end of the elastic beam through a rigid wire bypassing the force amplification component; the second magnet is arranged at the outside of the first magnet in a sleeving manner and is in clearance fit with the first magnet; and the second magnet is fixedly arranged in the shell and is magnetically repulsive with the first magnet. The fiber bragg grating clinometer provided by the invention has high measurement accuracy, a large measurement range,a simple structure and convenient use, and is of great significance for the structural deformation monitoring of civil engineering.

The invention relates to the technical field of radio frequency antennas, in particular to a combined antenna which comprises a first mounting plate, a second mounting plate and a circuit board, the second mounting plate is arranged on the upper surface of the circuit board, the first mounting plate is arranged on the upper surface of the second mounting plate, and the second mounting plate is larger than the first mounting plate, so that mounting positions are formed in the periphery and/or the side face of the upper surface of the second mounting plate. The upper surface of the first mounting plate is provided with a positioning antenna, and the mounting position of the second mounting plate is provided with at least two mobile communication antennas. According to the combined antenna, the positioning antenna is arranged in the center, the mobile communication antennas are arranged surrounding the positioning antenna; mutual influence between the mobile communication antennas and thepositioning antenna can be effectively enhanced; therefore, the stability of the phase center of the positioning antenna is ensured, the positioning antenna can be assisted by using the mobile communication antennas, an accurate positioning signal can be obtained in real time through a carrier phase difference technology, the high-precision measurement requirement in the industry is met, and theoperation efficiency is improved.

The invention discloses a portable train wheel normal section contour structured light vision measurement system and method. According to the method, a multi-line structured light vision sensor reconstructs general contours of train wheels at different visual angles, the general contours are rotated around an axis and projected to an axis passing plane, so that a normal section contour is obtained, and the complete normal section contour of the train wheels can be obtained by splicing measurement results at the multiple visual angles. The invention provides a train wheel normal section profilemeasurement method which is not constrained by the position and attitude of a sensor. The method has the characteristics of high measurement precision, high operation flexibility, high automation degree, strong robustness and the like.

The present invention is a precise liquid taking and measuring device for a water quality analyzer, belonging to the technical field of precise liquid taking and measuring devices; the invention overcomes the deficiencies in the prior art, and the problem to be solved is: to provide a precise liquid taking and measuring device for a water quality analyzer, which adopts The solution is: a precise liquid taking and measuring device for a water quality analyzer, including: a measuring bracket, an upper interface, a lower interface, a measuring tube, an upper photoelectric measuring mechanism, a lower photoelectric measuring mechanism, a hose, a peristaltic pump, and a reagent liquid feeding mechanism. The structure is as follows: the top of the metering bracket is provided with an upper interface, the bottom of the metering bracket is provided with a lower interface, a measuring liquid pipe is arranged between the upper interface and the lower interface, the upper interface is connected with a hose and a peristaltic pump, and the lower interface is connected with a reagent inlet. The middle and upper part of the metering bracket is provided with an upper photoelectric measuring mechanism, and the middle and lower part of the metering bracket is provided with a lower photoelectric measuring mechanism; the invention is widely used in the online automatic monitoring system of water quality.

The invention relates to the distance measurement technology field and particularly relates to a point-line form mileage measurement device. The device comprises a driving wheel rolling on a measurement-needing surface, a decimal scale gear transmission set, an integer scale gear transmission set, a decimal dial arranged at a tail end of the decimal scale gear transmission set, and an integer dial arranged at a tail end of the integer scale gear transmission set, wherein an initial end of the decimal scale gear transmission set, an initial end of the integer scale gear transmission set and the driving wheel are coaxially arranged, the decimal dial has n scale lines distributed around the decimal dial in a circumferential array mode, a radius of the driving wheel is r, a transmission ratio of the decimal scale gear transmission set is a, a transmission ratio of the integer scale gear transmission set is b, 2Pira/n is not greater than 0.1m, the integral dial has t scale lines distributed around the integral dial in a circumferential array mode, 2Pirb/t is not smaller than 1m, and thereby rolling length of the driving wheel can be calculated according to pointer reading of the integral dial and pointer reading of the decimal dial. The device is advantaged in that the device is convenient to operate, and relatively long construction length can be measured by one person.

The invention discloses a diffractive optical chip, which is provided with an incident surface for realizing intensity homogenization and an emergent surface for realizing phase homogenization, the outer diameters of the incident surface and the emergent surface are 25.4 mm, and the incident surface and the emergent surface are symmetrically arranged; fused quartz (JGS1) is used as a substrate material, a laser direct writing gray mask technology is adopted for continuous face type manufacturing, a micro-nano double-face monomer structure or a micro-nano four-face double-body structure with the thickness being 40 mm is formed, and the micro-nano four-face double-body structure further comprises two unstructured planes with the distance being 38 mm. The embodiment of the invention is simple in structure, ingenious in design and convenient to implement, has outstanding substantive features and remarkable progress, and is suitable for large-scale popularization and application.

The invention relates to a micron-scale visual displacement calibration method, wherein the method comprises the steps: selecting an object space telecentric lens/or a double telecentric lens as an image acquisition tool, selecting two objects to be calibrated as a movable calibration object and a fixed calibration object respectively, acquiring images of the calibration objects by the lens, and calculating to obtain a central pixel coordinate of a mark point; and calculating the actual displacement value of the center pixel coordinate of the mark point after the position of the movable calibration object is moved by combining the displacement of the movable calibration object and the center pixel coordinate offset value of the mark point caused by the influence of the temperature on the fixed calibration object. The invention also relates to a micron-scale visual displacement calibration device comprising a camera, an object space telecentric lens/or double remote lenses, the movable calibration object and the fixed calibration object. The technical problem that the measurement precision is reduced under the influence of environment temperature and camera self-heating is solved, the high-precision measurement requirement of visual displacement calibration in a normal-temperature environment is met, and the measurement precision can reach +/-1 micron.

The invention relates to the field of absolute value code discs, and discloses a decoding method of an absolute value encoder, which comprises the following steps of: outputting a first driving signal for driving an LED light source and a second driving signal for controlling a CCD (Charge Coupled Device); receiving pixel information collected by a CCDon the absolute value encoder, wherein the pixel information is a pixel pattern which is collected by the CCD and formed by light and dark stripes of a coded disc irradiated by an LED light source on the absolute value encoder; determining a position code corresponding to the pixel information according to the code corresponding to each stripe in the pixel information, and determining a coarse angle of a measuring shaft connected with the coded disc according to the position code; calculating the average value of the distances between the center positions of a plurality of stripes in the pixel information and the center of a preset pixel corresponding to the CCD as a subdivision value; and correcting the rough angle according to the subdivision value to obtain an accurate angle of the measuring shaft. According to the invention, the precision of the output angle of the absolute value coded disc is improved, so that the high-precision measurement requirements of different external measurement devices are met.