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Static high-pressure experiment data acquisition system and method based on LabVIEW

A technology for data acquisition systems and high-voltage experiments, which is applied in general control systems, control/regulation systems, and program control in sequence/logic controllers. There are problems such as data synchronization acquisition function, etc., to achieve effective CPU utilization, improve data analysis efficiency, and shorten the program development cycle.

Active Publication Date: 2019-01-18
INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1) The degree of integration and automation of the acquisition system is not high
In most of the current static high pressure experiments, the temperature and pressure have achieved automatic control and data storage, but the physical parameter measurement device of the sample has not been integrated, and researchers need to build it themselves, and can only use manual measurement and manual data recording , due to the slow experimental pressurization process and many variable parameters of the experimental conditions, the duration of the entire experimental process can reach several days, the recorded data is large, and the requirements for data acquisition accuracy and synchronization accuracy are high; the manual operation process is cumbersome and time-consuming, and the degree of automation Low, which affects the experimental efficiency to a certain extent, and the data is recorded manually at regular intervals, the synchronization accuracy is low, and the error is large
[0006] 2) Does not have data synchronous acquisition function
Static high-pressure experiment data acquisition system does not have a unified standard trigger point to trigger the start and interval of data recording. The synchronization and time interval of the recording are determined by observing the time interval with human eyes. The experimental results have large errors.
[0007] 3) Does not have the function of real-time data storage and analysis
During the experiment, due to manual recording of data values, the control software cannot store them in real time. At the same time, when the experimental conditions change, the measured real-time data cannot be analyzed in time, so the status of the experimental samples cannot be quickly reflected. It is easy to cause the experiment to fail due to the uncertainty of the experimental condition limit
[0008] After searching, there is no relevant patent on the integrated static high-pressure experiment data acquisition system based on LabVIEW software in China at present. There are resource competition problems in the control of computer synchronous control, computer multi-communication interface control, and the application of multi-thread parallel operation mechanism. In addition, sophisticated high-end equipment is accompanied by complex operation and debugging processes, which takes a long time. Therefore, we invented A Data Acquisition System for Static High Pressure Experiment Based on LabVIEW

Method used

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Examples

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Embodiment 1

[0067] Embodiment 1: see Figure 1 to Figure 2 , a static high pressure experimental data acquisition system based on LabVIEW, comprising a sound velocity measuring device, the sound velocity measuring device comprising a six-sided press, an ultrasonic transceiver, a digital oscilloscope and a computer;

[0068] The six-sided top press includes a cavity for installing samples, 6 top hammers, a hydraulic system driving the top hammer movement, a heating unit and a PLC controller, and the hydraulic system and the heating unit are all connected with the PLC control connected to the device, and its work is controlled by a PLC controller, and the PLC controller is connected to a computer;

[0069] The ultrasonic transceiver is connected to a computer via a digital oscilloscope to transmit ultrasonic signals to the sample, and the received echo signal is displayed on the digital oscilloscope and then sent to the computer to calculate the sound velocity value;

[0070] It also inclu...

Embodiment 2

[0105] Example 2: see Figure 1 to Figure 6 , except the following content, all the other are identical with embodiment 1.

[0106] The computer mainly has 6 work tasks:

[0107] (1) Obtain the pressure and temperature values ​​in the pressure and temperature collector;

[0108] (2) The pressure and temperature values ​​are used as feedback, and the segmented control algorithm written by the computer is used to accurately control the pressurization and heating of the six-sided top press;

[0109] (3) Control the numerical control current source to input current to the sample, measure the voltage, and display the current and voltage values ​​in real time;

[0110] (4) Control the real-time acquisition of ultrasonic data by the digital oscilloscope, real-time display and storage;

[0111] (5) Receive the experimental conditions input by the user and convert them into control commands recognizable by the computer, which are used to control the digital oscilloscope and the nume...

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Abstract

The invention discloses a static high-pressure experiment data acquisition system and method based on LabVIEW, which is mainly used for measurement of the sound velocity and the conductivity of an experimental material in a high-temperature and high-pressure experiment, and real-time temperature and pressure data acquisition. The whole system integrates the sound velocity measurement and the conductivity measurement; a computer is adopted to integrate a cubic press, an ultrasonic transceiver, a digital oscilloscope, a numerical control current source and the like in the same software for control; experimental conditions input by scientific researchers are automatically recognized; automatic control of the whole experiment is completed; parameters of data of real-time temperature, pressure,conductivity or the like of the static high-pressure experiment are synchronously acquired; and analysis, display and real-time storage are completed. Besides, the functions of time-triggered synchronous acquisition, preset temperature point-triggered acquisition, preset pressure point-triggered acquisition and the like can be achieved. The system has the advantages of being high in synchronization precision, high in speed, simple to adjust, low in control difficulty and diversified in interface function, and can achieve preset acquisition work of various experimental conditions.

Description

technical field [0001] The invention relates to the technical field of static high pressure experiment data acquisition, in particular to a static high pressure experiment data acquisition system and acquisition method based on LabVIEW. Background technique [0002] The measurement of sound velocity and electrical conductivity under high temperature and high pressure has important physical significance and application value for exploring the internal atomic and electronic structure of materials, as well as the related compression characteristics and state equation research. The temperature-pressure phase diagram of the material can be obtained by studying the sound velocity and conductivity changes of the sample under high temperature and high pressure conditions. The method of obtaining material properties in situ based on the loading of six-sided top large cavity press is one of the important means to study the phase transition and state equation of materials. However, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N35/00G05B19/05
CPCG05B19/058G01N35/00584G05B2219/163
Inventor 吴兆奎徐亮何强李绪海
Owner INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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