Hunger J, Cerjak I, Schoenmaker H, Bonn M, Bakker H J
FOM Institute AMOLF, Amsterdam, The Netherlands.
Rev Sci Instrum. 2011 Oct;82(10):104703. doi: 10.1063/1.3647982.
We describe a variable path length waveguide setup developed to accurately measure the complex dielectric permittivity of liquids. This is achieved by measuring the complex scattering parameter of the liquid in a waveguide section with a vector network analyzer in combination with an E-band frequency converter. The automated measurement procedure allows fast acquisition at closely spaced intervals over the entire measurement bandwidth: 60-90 GHz. The presented technique is an absolute method and as such is not prone to calibration errors. The technique is suited to investigate low-loss as well as high-loss liquids in contrast to similar setups described previously. We present measurements for a high-loss liquid (water), an intermediate-loss sample (ethanol), and for nearly loss-less n-octane. Due to the available phase information, the present data have an improved accuracy in comparison with literature data.
我们描述了一种为精确测量液体复介电常数而开发的可变路径长度波导装置。这是通过使用矢量网络分析仪结合E波段变频器测量波导段中液体的复散射参数来实现的。自动化测量程序允许在整个测量带宽（60 - 90 GHz）内以紧密间隔快速采集数据。所提出的技术是一种绝对方法，因此不易出现校准误差。与先前描述的类似装置相比，该技术适用于研究低损耗以及高损耗液体。我们展示了高损耗液体（水）、中等损耗样品（乙醇）以及几乎无损耗的正辛烷的测量结果。由于可用的相位信息，与文献数据相比，当前数据具有更高的精度。
