The Faraday forcing method in levitated liquid droplets has recently been introduced as a method for measuring surface tension using resonance. By subjecting an electrostatically levitated liquid metal droplet to a continuous, oscillatory, electric field, at a frequency nearing that of the droplet’s first principal mode of oscillation (known as mode 2), the method was previously shown to determine surface tension of materials that would be particularly difficult to process by other means, e.g., liquid metals and alloys. It also offers distinct advantages in future work involving high viscosity samples because of the continuous forcing approach. This work presents (1) a benchmarking experimental method to measure surface tension by excitation of the second principal mode of oscillation (known as mode 3) in a levitated liquid droplet and (2) a more rigorous quantification of droplet excitation using a projection method. Surface tension measurements compare favorably to literature values for Zirconium, Inconel 625, and Rhodium, using both modes 2 and 3. Thus, this new method serves as a credible, self-consistent benchmarking technique for the measurement of surface tension.

最近已经引入悬浮液滴中的法拉第强迫方法作为使用共振测量表面张力的方法。通过使静电悬浮的液态金属小滴在接近小滴的第一个主要振荡模式（称为模式2）的频率下经受连续的振荡电场，该方法先前已显示出确定材料表面张力的方法。尤其难以通过其他方式（例如液态金属和合金）进行加工。由于采用连续强制方法，因此在涉及高粘度样品的未来工作中也具有明显的优势。这项工作提出（1）一种基准实验方法，该方法通过激发悬浮液滴中的第二种主要振荡模式（称为模式3）来测量表面张力，以及（2）使用投影方法对液滴激发进行更严格的量化。使用模式2和3，表面张力的测量结果与Zirconium，Inconel 625和Rhodium的文献数据相吻合。因此，这种新方法可作为一种可靠的，自洽的基准技术来测量表面张力。