Riobo L M, Veiras F E, Gonzalez M G, Garea M T, Sorichetti P A
Appl Opt. 2018 Jan 10;57(2):217-224. doi: 10.1364/AO.57.000217.
This paper describes the design and performance of a phase demodulation scheme based on software-defined radio (SDR), applied in heterodyne interferometry. The phase retrieval is performed in real time by means of a low-cost SDR with a wideband optoelectronic front-end. Compared to other demodulation schemes, the system is quite simpler, versatile, and of lower cost. The performance of the demodulator is demonstrated by measuring the displacement per volt of a thin-film polymeric piezoelectric transducer based on polyvinylidene fluoride for ultrasonic applications. We measured displacements between 3.5 pm and 122 pm with 7% relative uncertainty, in the frequency range from 20 kHz to 1 MHz.
本文描述了一种基于软件定义无线电（SDR）的相位解调方案的设计与性能，该方案应用于外差干涉测量中。通过具有宽带光电前端的低成本SDR实时进行相位恢复。与其他解调方案相比，该系统更加简单、通用且成本更低。通过测量基于聚偏二氟乙烯的用于超声应用的薄膜聚合物压电换能器的每伏位移来证明解调器的性能。我们在20kHz至1MHz的频率范围内测量了3.5皮米至122皮米之间的位移，相对不确定度为7%。
