KEYWORDS: Data acquisition, Clocks, Data communications, Data transmission, Standards development, Data processing, Temperature metrology, Operating systems, Distributed computing, Algorithm development
This article first introduces the basic characteristics of Harmony OS. As an emerging operating system, the core advantage of Harmony OS lies in the unified architecture standard and distributed soft bus capability, which effectively solves the problems of inconsistent equipment and interface standards and complex experimental wiring in traditional wind tunnel data acquisition systems. This article further designs a wind tunnel data acquisition system based on Harmony OS, which can synchronously collect temperature, pressure and other information from different measurement points in the wind tunnel. The hot air tunnel was tested through technologies such as embedded development, hardware communication and interface conversion, and distributed synchronous data collection. Successfully completed the requirement for distributed data synchronization collection, with synchronization deviation maintained between 2.5 microseconds. The results indicate that Harmony OS has broad application prospects and research value in wind tunnel data acquisition systems.
Doppler broadening thermometry (DBT) takes advantage of the high resolution characteristic of laser absorption spectroscopy to obtain thermodynamic temperature by measuring optical frequency. It is one of the research hotspots in the field of thermodynamic temperature measurement after the Kelvin redefinition in 2018. In this paper, the direct absorption spectroscopy based on Cesium (133Cs) D1 (6S1/2→6P1/2) line was measured, and the thermodynamic temperature of atomic gas in thermal equilibrium state was obtained by extracting Doppler width of absorption line. The experimental results showed that average relative error of thermodynamic temperature was 0.01% and the standard deviation was 0.14% after 50 rounds of testing at 303.15 K. These research results prove the feasibility of Doppler broadening temperature measurement, and provide research support for the realization and transfer of thermodynamic temperature.
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