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

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...

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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

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