39results about How to "Many measuring points" patented technology

The invention relates to the precision shaft angle measuring instrument precision detection filed, more particularly to an angle measurement precision detection apparatus of an encoder and a detection method thereof. The apparatus comprises a coupling assembly, a precision main shaft, a motor, a precision encoder, a connection base, a rotary table, a workbench, and a computer system. The precision encoder is employed as a reference and is connected with the precision main shaft coaxially. The precision main shaft is driven by the motor; and an output shaft of the precision main shaft is connected with a detected encoder. The computer controls the rotating speed and the position of the motor as well as simultaneously collects angle measurement data of the precision encoder and the detected encoder; and an error value representing deviation of the position output of the detected encoder from the position output of a reference precision encoder is obtained in rotation angles from 0 degree to 360 degrees of the precision main shaft. And processing is carried out by the computer to provide various measurement errors of the detected encoder and error frequency spectrums. According to the invention, beneficial effects are as follows: there are lots of measurement points and measurement can be carried out continuously, so that various errors of a detected encoder can be reflected; a frequency spectrum analysis on an error source can be carried out; automatic measurement is carried out, the measuring period is short and efficiency is high; and electronization of data processing is realized as well as detection data are filed.

The invention relates to a system for monitoring the temperature, the stress and the deformation of a frozen wall of a shaft in real time and a laying method thereof and belongs to the technical field of detection instrument equipment. The system is used for carrying out real-time automatic monitoring on the temperature, the stress and the deformation of the frozen wall of the shaft constructed by a freezing method. The system comprises the frozen wall of the shaft constructed by the freezing method, which needs to be monitored, an engineering monitoring position, a deformation monitoring sensing equipment and instrument and a monitoring data software analysis system. The invention solves the problem that the deformation of the frozen wall of the shaft constructed by the freezing method and the damage to the frozen wall directly relate to the normal construction of the shaft engineering constructed by the freezing method, so that how to find the symptom before the deformation of the frozen wall of the shaft constructed by the freezing method or the damage to the frozen wall exceeds the allowed deformation or damage is the key problem of reducing the disaster. The system and the laying method thereof have the advantage that the deformation monitoring system for carrying out real-time automatic monitoring on the temperature, the stress and the deformation of the frozen wall of the shaft can provide early warning and forecasting before the deformation of the frozen wall of the shaft constructed by the freezing method or the damage to the frozen wall exceeds the allowed deformation or damage so as to reduce the disaster and the loss.

The invention provides a distributed fiber grating device for measuring temperature and strain of a bearing ferrule. The distributed fiber grating device comprises mechanical accessories, a measured bearing, fiber grating sensors, a fiber rotating connector and a data acquisition system, wherein a bearing base is mounted on a bearing box; a bearing end cover is fixed to the bearing base to achieve clamping fixation between a bearing outer ring and the bearing base; a bearing inner sleeve is mounted on a main shaft; an adapter shaft is fixed to the left end of the main shaft; the fiber rotating connector achieves signal transmission of the fiber grating sensors on the inner ring, omits a centering, debugging and mounting process of a fiber collimator, and is more convenient to operate; a plurality of fiber grating sensing measurement points which are circumferentially arranged along the surface of the bearing ferrule are arranged on the fiber grating sensors; the two fiber grating sensors are fixed to a measurement position of the measured bearing, and acquire the strain and the temperature of the measured bearing through the data acquisition system. The distributed fiber grating device has the advantages of strong anti-interference capability, good stability, multiple measurement points, strong adaptability and the like, and can achieve high-precision and distributed in-situ measurement on temperature and strain parameters of the bearing ferrule.

Provided is a method for point cloud data processing and crossover object obtaining of a transmission line. A terrain and ground object information database is established according to actual information of terrain and ground objects in three-dimensional point cloud data; original three-dimensional point cloud data is obtained by utilizing three-dimensional laser scanning; and the ground objects are obtained. On the original basis of not changing the original point cloud data, no modeling rendering processing is performed, spatial information at any point is not changed, he point cloud data of the various ground objects is obtained accurately; and according to concrete requirements of design disciplines, a topographic map suitable for three-dimensional design of a high-voltage transmission line is formed, which is achieved internationally for the first time and is a breakthrough in the technical field of track design.

The invention discloses an underwater topography matching navigation system based on an acoustics Doppler log. The system comprises the multi-beam comprehensive Doppler log, a differential global positioning system, a platform compass, a data collecting module and a submarine topography matching module. The multi-beam comprehensive Doppler log, the differential global positioning system, the platform compass and the submarine topography matching module are connected with the data collecting module. The multi-beam comprehensive Doppler log has the advantages of being provided with more measure points, and being full in coverage and high in precision, and can reflect the fluctuation change condition of underwater topography more accurately and comprehensively. The multi-beam comprehensive Doppler log is matched with the submarine topography matching module to form the underwater topography matching navigation system based on the acoustics Doppler log. Compared with a traditional underwater topography navigation system, the system is free from time limitation, and can ensure the accuracy of real-time navigation information in the long-time navigation process.

The invention discloses a semicircular rake-shaped ion thruster beam divergence angle test device. A Faraday probe is fixed on a semicircular rake, the semicircular rake is a semi-circular unenclosedarc structure and is connected with a driving assembly through a rotation assembly, under the driving action of the driving assembly, a semi-circular framework can rotate around a semi-circular centerline of the framework, a plume area is scanned, beam density of different positions of the ion thruster plume area can be tested through a test control assembly, an ion thruster beam divergence anglecan be acquired through calculation. The device is advantaged in that beam density of the multiple positions of the plume area can be simultaneously tested, multiple measurement points are distributed, test data reliability is high, and the device is quite suitable for measuring beam divergence angles of electrical propulsion thrusters such as ion thrusters and Hall thrusters.

The invention relates to the technical field of LCR testing, and discloses a multi-channel high-precision LCR testing system. Themulti-channel high-precision LCR testing system comprises a plurality of scanning cards which are connected with a product to be tested and have the same structure, and measuring cards which is arranged opposite to the scanning cards, the plurality of scanning cards are connected with the measuring card through a back connecting plate, the scanning cards are used for realizing channel switching, the measuring cards are used for realizing an LCR test, the back connecting plate is used for realizing signal transfer, the back connecting plate is connected with a main control board, and the main control board is used for realizing signal control on the measuring cards and the scanning cards. According to the system, synchronous measurement of a plurality of measuring plates is realized, the measuring plates can be randomly corresponding to one scanning plate or a plurality of scanning plates, and the application is flexible.

The invention discloses a motorized spindle simulation working condition loading test device. The motorized spindle simulation working condition loading test device includes an industrial personal computer (PC), a driving device connected with the industrial PC, a motorized spindle connected with the driving device, and a loading driving mechanism; a test bar is arranged at the motorized spindle; the loading driving mechanism is installed below the motorized spindle; the loading driving mechanism is installed on a test bench base; and a cooling water circulation device and an oil-gas lubrication device are both connected with the motorized spindle. According to the motorized spindle simulation working condition loading test device of the invention, loading of a radial force, an axial force, a torque, vibration and heat cutting can be completed by means of simulation loading gears installed at an end portion of the test bar; the loading can be changed through replacing different types of gears and adjusting the modification coefficients of the meshing gears; and the loading driving mechanism is driven through a preset loading program to continuously move along the axial direction and the radial direction of the motorized spindle, so that the meshing condition of the loading gears can be automatically changed, and therefore, the simulation of automatic and continuous loading of an actual working condition can be completed, and thus, automation degree is high, a simulation condition is closer to an actual cutting working condition, and test data are more authentic.

The invention provides a monitoring system for unmanned-aerial-vehicle body damage. The system includes an unmanned-aerial-vehicle body, a BOTDA system and a ground control station, the BOTDA system is loaded on the unmanned-aerial-vehicle body, and real-time communication between the BOTDA system and the ground control station is achieved through a communication system; the BOTDA system includesan optical part, a software part and a hardware part, and the optical part includes a tunable laser, an electro-optic controller, a polarization controller, an optical attenuator, an optical isolatorand a photoelectric detector; the software part includes a tunable laser drive circuit, an electro-optic modulator drive circuit, a polarization controller drive circuit, a signal amplification circuit, a data acquisition circuit and a microwave frequency detection circuit. The provided monitoring system for unmanned-aerial-vehicle body damage has the advantages that a fiber bragg grating sensor has light weight, small size, high temperature resistance, corrosion resistance, anti-electromagnetic interference, good reliability, high measurement accuracy, many measurement points and a large measurement range, and the measurement result can be sent back to a ground control center in real time through a wireless communication module.

The invention relates to a roller centrifugal layer inner circle temperature measurement device, and belongs to the technical field of the roller manufacturing equipment. The measurement device comprises a temperature measurement gun barrel (1), an instrument box (5), a front bracket (2), a rear bracket (3), a trolley (4), and a temperature measurement thermocouple (1-3); the instrument box (5) isarranged at one end of the temperature measurement gun barrel (1), the temperature measurement thermocouple (1-3) is arranged at the other end of the temperature measurement gun barrel (1); the rearbracket (3) and the front bracket (2) are orderly arranged at one side of the instrument box (5) through the temperature measurement gun barrel (1); and the front bracket (2) and the rear bracket (3)are arranged on the trolley. The temperature measurement device disclosed by the invention can replace the manual measurement when performing centrifugal casting, and can provide more accurate and reliable roller centrifugal layer inner circle temperature parameter, and provide guarantee for the production quality of the roller.

The invention discloses a fiber bragg grating testing method for flow-induced vibration of a tube bundle structure. The method comprises the following steps: firstly, reasonably selecting the layout position of a fiber bragg grating in a test, adhering the fiber bragg grating to the outer wall of a test tube, and performing waterproof treatment. The advantages of high anti-interference capability, distributed measurement, small transmission loss and the like of the fiber bragg grating are fully utilized to replace the traditional strain gauge test, the strain measurement of more than ten measuring points can be realized only by one fiber, and the result is not interfered by external temperature; and the method has the advantages of low test cost, simple installation process, high test precision, temperature self-compensation, multiple test points and the like, can provide data input for stress and fatigue life analysis of the tube bundle structure, can easily realize distributed strain measurement of the tube bundle structure in a water environment, can replace a large number of strain gauges, is simple to operate, and low in test cost, can realize distributed accurate measurement of the flow-induced vibration strain of the tube bundle structure with low cost, and has high application and popularization values.

The invention relates to a power station boiler fan efficiency real-time online calculation method based on DCS parameters. The method comprises the steps that a fan shaft in a fan system obtains parameters from a matched motor; the mass flow rate of air delivered by a fan is calculated: an equation is listed according to energy balance, fan outlet static pressure is obtained through calculation, an ECS system of a DCS monitors input electric power of a fan motor in real time, and the mechanical power of the fan shaft can be obtained according to the efficiency of the motor; the air power of the fan is calculated; and the fan efficiency is calculated. The method has the beneficial effects that along with the development of the technology, the function of the DCS configured by a unit is powerful, the arranged measuring points are perfect, the DCS is generally provided with the measuring points of the inlet and outlet medium temperature, pressure, inlet and outlet differential pressure, fan motor power and the like of a power station boiler fan, the measuring points are utilized to carry out real-time online calculation on the fan efficiency, operation guidance and reference are provided for operators, and the accuracy is high.

The invention provides a distributed pressure measurement system. The distributed pressure measurement system comprises a thin film pressure sensor, a signal acquisition module and a PC terminal, wherein the thin film pressure sensor is used for sensing external measured pressure; the signal acquisition module is used for converting a pressure signal output by the thin film pressure sensor into adigital signal, encoding the digital signal and transmitting the encoded digital signal to the PC terminal; and the PC terminal is used for decoding the received digital signals and performing graphiccalculation, data analysis or system calibration after decoding, so that the system can be matched with sensors of different models and is flexible to use; and meanwhile, multiple functions of graphic display, data analysis and the like are achieved, and scientific research and detection of users are facilitated.

The invention discloses a space three-dimensional system for monitoring the deformation of an underground cavern lining for long time. The space three-dimensional system comprises a site end and a remote end, wherein the site end is in communication connection with the remote end; and the site end is installed at the position of an underground three-dimensional cavern. According to the space three-dimensional system, a point mode and a distributed arrangement method are combined, the deformation of the surface of the underground cavern lining can be monitored in all directions, the number of measuring points is large, the measuring precision is high, field and remote data storage can be realized, and through long-term monitoring, a dynamic deformation cambered surface map of the three-dimensional cavern lining can be obtained.

The invention discloses an F-P etalon-based measurement method for miniature extension quantity. The F-P etalon-based measurement method is characterized by comprising the following steps of enablingone end of a measured metal rod to be fixed and the other end to be connected with a lifting table of a workbench during measurement of a linear expansion coefficient of a metal rod, wherein the lifting table can be driven to synchronous ascend with slight extension of the length of the metal rod during the heating process; and enabling one end of a measured metal wire to be fixed and the other end to be connected with the lifting table during measurement of Young modulus of the metal wire by a stretching method. According to the method, the miniature extension quantity is converted to changeof radiuses of interference fringes in an F-P etalon interference optical field by an optical lever, and the measurement of the miniature extension quantity is further achieved by measuring distance among the interference fringes. The invention relates to the field of measurement equipment, in particular to the F-P etalon-based measurement method for the miniature extension quantity. The measurement process is simpler and more convenient, and the measurement result accuracy is higher.

The invention relates to an online quantum gas analysis meter, which comprises a host, a detection cabinet and a detection probe, wherein the detection cabinet internally comprises a light source generator, light paths, a light quantum entanglement generation crystal, light quantum transmitting modules and a light quantum analysis module; the light source generator is a pluggable extensible lightsource generator; the light source generator is communicated with the light quantum entanglement generation crystal through some of the light paths; the light quantum entanglement generation crystal is communicated with the light quantum transmitting modules through some of light path; each light quantum transmitting module is communicated with a detection probe and one light quantum analysis module through an optical fiber and one light path; the light quantum analysis module is connected with the host through a communication bus; an end part of the detection probe is a sapphire window. According to the online quantum gas analysis meter, the contents of certain or various ingredients of most of process gas in an industrial field can be detected online in real time, and a distributed integral solution of the online analysis of the gas is realized.

The invention discloses a real-time liquid level measurement and analysis method based on a distributed optical fiber liquid level sensor. The real-time liquid level measurement and analysis method comprises the steps: obtaining the central wavelength and intensity of each measurement point of the distributed optical fiber liquid level sensor; establishing a synchronous sample capacity database according to the acquired central wavelength and intensity of each measurement point; determining a conversion cumulative number according to the established synchronous sample capacity database; according to the conversion cumulative number, performing judging to obtain a sudden change point; and according to the sudden change point, determining the real-time liquid level of the distributed optical fiber liquid level sensor. The key technical problem of distributed optical fiber liquid level real-time analysis and calculation is solved, and the requirements of liquid level sensing and real-time data output in the future can be met.