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气相声速是目前可测量的最精确的热物性之一,圆柱定程干涉法是极有应用前景的测量方法。本文分析了圆柱定程干涉法测量气相声速的实验原理,在此基础上研制了一套新的实验系统,由共鸣腔、压力仓、共振频率测量系统、温度和压力测量系统以及数据采集与控制系统组成。实验系统综合考虑了多种非理想因素的影响,提高了共振频率测量的信噪比,降低了测量不确定度。
Crosstalk velocity is one of the most accurate thermophysical properties measurable so far. Cylindrical spacer interferometry is a promising method of measurement. This paper analyzes the experimental principle of measuring the gas-phase velocity of gas by the cylinder-stator interferometry. Based on this, a new experimental system has been developed. The system consists of a resonance chamber, a pressure chamber, a resonance frequency measurement system, a temperature and pressure measurement system and a data acquisition and control System composition. The experimental system considers the influence of many non-ideal factors, improves the SNR of the resonance frequency measurement and reduces the measurement uncertainty.