111results about How to "High data acquisition accuracy" patented technology

The invention relates to a high-speed data acquisition card implemented on the basis of a hardware, which comprises a signal conditioning circuit. The signal conditioning circuit consists of a digital gain amplifier and a single ended to differential converter, and is used for inputting an input signal into an analog-to-digital conversion circuit sequentially by the digital gain amplifier and the single ended to differential converter; the analog-to-digital conversion circuit is controlled by a sampling clock signal to acquire the input signal, convert the input signal into a digital signal and input the digital signal into an FPGA (Field Programmable Gata Array) data processor; the FPGA data processor is used for carrying out data buffering on the received digital signal and storing digital signal data into a high-speed dynamic memory controlled by the FPGA data processor; the data is transferred onto a PC (Personal Computer) machine by the cooperative work of an on-chip embedded system in which the FPGA data processor is used as the core and an ARM (Advanced RISC Machines) control module; and a power supply comprises an analog power supply network and a digital power supply network and has an external power supply mode. After the high-speed data acquisition card is adopted, 500MHz analog-to-digital sampling and real-time storing functions can be realized. The high-speed data acquisition card can be widely applied to the field of acquisition of the high-speed signal data.

The invention relates to a collision case playback system of the cars and two-wheeler in the computer application technical field, wherein an accident site reconstitution module collects the accident field data and picture, reconstitutes and reverts the site; a two-wheeler driver modularization dummy customizing module builds a dummy model matching with the body shape of the driver, extracts the damaged sensitive parts of the dummy model, sets up a finite element model, becomes a new conbination dummy model combined with the multi-rigid body dummy main body model; a collision process emulating module performs the scaling of model matching with the sufferer bodily form characteristics, meanwhile builds the integral accident site three-dimensional model before the accident, and simulates and computes the primary collision result; an optimization recurrence module builds the optimization flow, optimizes the collision simulation; an accident recurrence result post-processing module displays the optimized simulation result in the collision process animation and the collision parameters. The invention can realizes the site information collection, fast simulation and modelization, short treating period, high precision and high reliability.

The invention discloses a full-automatic three-axis testing system for a saturated soil stress path. The full-automatic three-axis testing system comprises a pressure chamber (1), a computer (2), an axial force volume controller (3), a confining pressure volume controller (4), a back pressure volume controller (5), a data acquisition box (6) and a pressure volume control system connected with the computer (2). The full-automatic three-axis testing system for the saturated soil stress path is reasonable in structural design, convenient to operate, high in automation degree and good in stability and can be used for accurately controlling a complicated stress path of a soil body.

The invention discloses a pairing processing method of a large-sized and irregular revolving molding surface member. In the method, a three-dimensional simulation measuring head is utilized to carry out automatic tracing and measuring and data collection on a practical fitting curved surface of a covering, a data point set [p] of the centre of a sensing finger pommel of the three-dimensional simulation measuring head is obtained, mathematical treatment with isometry calculation is carried on the obtained data point set [p], a corresponding point set [p1] of the practical surface of the covering is obtained, location optimization is carried out on theoretical covering curved surface, and a digital pairing processing point set [Q] of the surface of a honeycomb sandwich is generated, compensation to the radius of a grinding wheel is carried out, a point set [M] of a movement locus of the centre of the grinding wheel is obtained, the three-axis linkage interpolation method taking C axis of a rotation axis as a benchmark is adopted, and the upper surface and the lower surface of the honeycomb sandwich are respectively ground and processed. The invention realizes integration of measurement, mathematical treatment and digital treatment of the large-sized and irregular revolving molding surface member and has high treatment precision and high treatment efficiency; in addition, the product percent of pass is 100 percent, and the production period is shortened to three days from ten days so as to meet the needs of production.

The invention relates to a pulse wind tunnel operation control system and pulse wind tunnel operation control method. The system comprises a PLC module, a driving section inflation valve, a driving section deflation valve, a driving section pressure sensor, a 1/2 valve, a double film section deflation valve, a double film section pressure sensor, a driven section inflation valve, a driven section deflation valve, a driven section pressure measuring module, a driven section vacuum pumping valve, a test section deflation valve, a test section vacuum pumping valve, a test section pressure sensor and a vacuum machine tool; the PLC module achieves automatic control in a wind tunnel test process, a distributed control mode is adopted, all operation is completed in a test control room, there is need to enter a field for work, a high pressure air source is isolated, and the personnel operation safety is guaranteed.

The invention discloses a high-precision overhead transmission conductor sag detection method, and relates to the technical field of metering length, width or thickness by metering equipment characterized by adopting an optical method. The method comprises the following steps: acquiring conductor point cloud data of different instantaneous points of one overhead transmission conductor in a measurement period; performing data processing on the wire point cloud data, establishing a wire coordinate system, and extracting wire feature point data; establishing a catenary equation of the overhead transmission conductor and a sag equation of the overhead transmission conductor based on the conductor coordinate system; and fitting and solving a catenary equation of the overhead transmission line and a sag equation of the overhead transmission line by adopting a nonlinear least square method based on the line feature point data. The method is high in precision, and can calculate the conductor sag at any position.

The invention discloses a cover plate type fiber bragg grating sensor and a packaging method thereof. The cover plate type fiber bragg grating sensor comprises a grating and a protection sleeve, wherein a wire jumper and tensile fibers are fixed in the protection sleeve. One end of the protection sleeve is fixedly connected with a flange interface, and the other end of the protection sleeve is fixedly connected with a temperature sensing box. The grating is packaged in the temperature sensing box, the wire jumper and the grating are connected with each other in the temperature sensing box. The packaging method of the cover plate type fiber bragg grating sensor includes preparing the sleeve, painting temperature-resistant AB glue, welding the wire jumper and the grating in fusion mode, leading the wire jumper to penetrate through the protection sleeve, fixing one end of the wire jumper not provided with the grating with the flange interface, arranging the grating at the central position of a sensing protection groove, and buckling a packaging cover plate on the sensing protection groove. Compared with the prior art, the cover plate type fiber bragg grating sensor is good in mechanical performance, sensor performance, insulation performance and firmness, and improves sensor firmness, data collection accuracy and data collection speed. The packaging method of the cover plate type fiber bragg grating sensor greatly improves production efficiency and production survival rate, simultaneously improves sensor firmness and enables the sensor not to split or fall easily.

The invention discloses a generator stator bar hot water flow experiment simulation device and an experimental method. The generator stator bar hot water flow experiment simulation device comprises a stator bar, a hot water loop, a cold water loop, temperature measuring elements and a data acquisition device, wherein a water inlet end of the stator bar is connected with water outlets of the hot water loop and the cold water loop, a water outlet pipeline of the stator bar is connected with a main loop water pump, and the main loop water pump is connected water inlets of the hot water loop and the cold water loop; the water inlet end of the stator bar is provided with a flowmeter, the water inlet ends and the water outlet ends of the hot water loop, the cold water loop and the stator bar are provided with the temperature measuring elements, and the data acquisition device acquires test values of all the temperature measuring elements and the flowmeter. The generator stator bar hot water flow experiment simulation device simulates the field test completely, operates all the test processes in situ, is simple, convenient, real-time and efficient, and is of very important significance to the intensive study of test factors such as flow, environment temperature and temperature difference on test effects and stability and the formation of scientific and practical test system and criteria.

The present invention relates to a program-controlled power system specially used in nanometer-processing, and belongs to the field of electronic technology. The present invention adopts dual-CPU program-controlled power structure, and mainly consists of an upper personal computer, a lower single chip computer, a multi-way DC power controlled by the single chip computer, a detector for output voltage and current as well as a serial communication circuit arranged between the upper and lower computers and the dual-CPU; under the support of the program-controlled software specially used in nano-processing, the present invention has the advantages that with high power, high precision of the voltage control and data collection, good stability as well as a plurality of modes of voltage control, the present invention can control the voltage output of the multi-way DC by a program, and can real-time show the testing curve, save the data and curve and check the data; the program-controlled power system is applicable to the processing of materials such as the nanometer tube array of anodic aluminum oxide or can be a template to prepare other metals and non-metallic nanometer tubes; the present invention also can be applicable to other nanometer-research and the preparation of oxide nanometer material as well as biochemical analysis.

The invention relates to an alternating current signal collection and automatic calibration method. Firstly, a CPLD is utilized for receiving square wave signals generated by collection and shaping of an alternating current collection module hardware frequency measurement loop, the CPLD carries out frequency tracking and calculation on the square wave signals, equally-spaced N pulse signals are output to a DSP in each period according to a measured frequency value, the frequency value is sent to the DSP, and the DSP completes N-point alternating current signal collection of each cycle; then the DSP uses pulse signals received from the CPLD as starting references of alternating current signal collection, the collection of all channel alternating current signals is finished in T/N, and N-point sampling of each alternating current signal is finished in the period T; and finally, automatic calibration is carried out on the collected alternating current signals. The method provided by the invention has the advantages that the collection capacity is large, the remote measurement precision is high, the calibration method is simple, and the expandability and the easy maintenance of the product are greatly improved.

The invention relates to a closed type cable state online monitoring method based on RFID. The closed type cable state online monitoring method based on the RFID comprises the following steps that (1) data of a sensor installed on a cable device are read in real time by an on-site data collecting unit through an RFID card reader, local storage is conducted on the data, whether the data exceed a set threshold value or not is judged, if the answer is positive, the collected data and alarm information are transmitted to a region data concentrator through a wireless radio-frequency network, and if the answer is negative, only the collected data are transmitted to the region data concentrator; (2) local storage is conducted on the received data and the received alarm information by the region data concentrator and after encryption and coding are conducted on the received data and the received alarm information, the data and the alarm information are transmitted to a back-stage management server through a mobile communication network; (3) decryption and decoding are conducted on the received data and the received alarm information by the back-stage management server, local storage is conducted, and the alarm information is sent to a user terminal in real time. Compared with the prior art, the closed type cable state online monitoring method based on the RFID has the advantages of being high in monitoring accuracy, good in data safety and the like.

The invention provides an agricultural product soil environment monitoring system based on an Internet of Things. The system comprises a soil collection module, a soil monitoring module, a wireless transmission module, a control processing module and an alarm module, wherein the soil collection module comprises multiple soil mass collection units, and each soil mass collection unit is provided with multiple sensors; the soil monitoring module comprises a monitoring point distribution unit and a monitoring point monitoring unit, wherein the monitoring point monitoring unit is used for performing analytical detection on to-be-detected soil conveyed by the soil collection module, and detection information is sent to the control processing module through the wireless transmission module; the control processing module comprises a preprocessing unit, a detection comparison unit and a processing unit; and the alarm module sends out a red alarm when soil environment monitoring data is greaterthan a set safety threshold. Through the system, real-time and effective monitoring on a soil environment is realized.

The invention relates to a high-precision map making method and system using a millimeter wave radar, and belongs to the technical field of radar. The method comprises the following steps of acquiringroad information by using the millimeter wave radar in a process of enabling a vehicle provided with the millimeter wave radar to pass through a road section; identifying road characteristics; and generating a high-precision map according to the road information, the road characteristics and vehicle information. The method has low hardware cost, low false alarm rate, high data acquisition precision, many identifiable objects and low environmental requirements and can cope with the severe weather and scenes with the low visibility and the like; and furthermore, through a crowdsourcing way, thevehicles provided with the millimeter wave radars pass through the same road section or pass through the same road section for multiple times to acquire the road information for many time, so that amillimeter wave radar high-precision map layer is formed, the map is timely updated, and thus the generated high-precision map meets the requirement for automatic driving to be beneficial to large-scale commercial use.

The invention discloses a farmland environment monitoring system with high accuracy and low cost. The system comprises a soil detection module, a wireless communication module and a remote terminal, wherein the soil detection module is composed of sensor nodes and used for collecting parameter indexes reflecting farmland environment condition, and transmitting the collected index data to the wireless communication module via a wireless sensor network; the wireless communication module is used for transmitting the received index data to the remote terminal; the remote terminal is used for storing and displaying the received index data, and giving an alarm when the index data is lower than a security threshold. The system provided by the invention has the beneficial effects that the farmlandenvironment monitoring system based on the wireless sensor is provided, the farmland environment parameter index can be remotely monitored in real time, and the degree of automation and data collection accuracy in farmland monitoring are improved.

The invention relates to an automatic tracking type solar scattered radiation measuring instrument and a measuring method. The device comprises a solar scattered radiation measuring device, a controller and an upper computer, the solar scattered radiation measuring device is in wireless connection with the controller, and the controller is in wireless connection with the upper computer. The longitude and latitude of a measurement site, the local time and the initial placement orientation of the automatic tracking type solar scattered radiation measurement instrument are obtained through the Beidou positioning time service module of the controller, and the declination angle, the elevation angle and the azimuth angle of the sun are calculated through the geometrical optics principle of the sun; the declination angle, the elevation angle and the azimuth angle of the sun at each moment when the number of days is n are used for controlling the solar scattered radiation measuring device to track the sun for position change, the solar scattered radiation measuring device obtains radiation voltage, and a solar scattered radiation value is calculated through the controller and transmitted to the upper computer for display and data storage. The solar scattered radiation measuring device can accurately and automatically operate, and an expensive optical tracking device is not needed.

This invention relates to a data collecting circuit, in which, an output end of a sample keeping circuit is connected with the input of a cascade program control amplifier, the other output is connected with the input of a pre-sampling circuit, the output of the cascade program control amplifier is connected with the input of a tail code converting circuit, the output of the pre-sampling circuit is connected with a coding circuit, after the sample keeping circuit collects analog voltage signals, it transfers them to the cascade program control amplifier and the pre-sample circuit, which first of all carries out A/D conversion to the analog voltage signals and then transfers them to the coding circuit to control the amplified multiple of the amplifier, which amplifies the analog signals according to the amplification multiple then to deliver them to the tail code conversion circuit to carry out accurate A/D conversion to it synchronously.

The invention discloses a signal processing method of an electronic system for single photon emission computerized tomography imaging. A multi-channel, independent trigger and fully digital electronic scheme is adopted by the method. The signal processing method comprises a multi-channel independent and parallel analog acqusition scheme and a high-integration digital processing scheme. The method specifically comprises the following steps: amplifying and forming a weak signal; performing multi-channel parallel collection; performing digital preprocessing on an analog signal, performing analog-digital conversion, series-parallel conversion, mutually independent trigger signal generation, baseline and gain adjustment and digital processing and transmission. The system realizes a multi-channel analog signal, high-speed, high-quality parallel acqusition scheme. The signal processing method is characterized in that fully parallel processing is performed, the acqusition accuracy is high, the digital processing method is flexible, the speed is high, the configuration parameter is easy to adjust, the upgrading is easy and the like. The invention also discloses the electronic system for the single photon emission computerized tomography imaging and single photon emission computerized tomography imaging equipment.