The Virtual Lock-in Amplifiers - Accuracy of Measurement Results in Light Transmission Experiments

Lintang Ratri Prastika, Lili Indarti, H. Hendro
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Abstract

This research focuses on the analysis of the measurement result of the virtual lock-in amplifier (virtual-LIA) in the light transmission experiment as the trial step of developing the virtual-LIA. The virtual-LIA used in this research is designed by using the Vernier sensor DAQ as the data acquisition and the LabVIEW as the programming media. The design of virtual-LIA is based on the mathematical operations of LIA. The type of virtual-LIA is a single phase with the capabilities to process the external reference signal. Light transmission experiments are carried out using formazin polymer suspension with turbidity level of 3000 NTU, 3500 NTU, and 4000 NTU as the medium in which light is passed. The accuracy of the measurement results is known by comparing the results of virtual-LIA with real-LIA SR510. The experiments are also carried out in bright and darkroom conditions to determine the ability of virtual-LIA in reducing noise signals. Based on the experiment, the results obtained that the measurement accuracy of the virtual-LIA developed is above 94% compared to the LIA SR510. Virtual-LIA could measure small signals with and without noise with the average percentage of differences measured between dark and bright conditions is 0.54%.
虚拟锁相放大器——光传输实验测量结果的准确性
本文重点分析了虚拟锁相放大器(virtual- lia)在光传输实验中的测量结果,作为开发虚拟锁相放大器的试验步骤。本文采用游标传感器DAQ作为数据采集,LabVIEW作为编程介质,设计了虚拟lia。虚拟LIA的设计是基于LIA的数学运算。虚拟lia的类型是具有处理外部参考信号能力的单相。采用浊度分别为3000 NTU、3500 NTU、4000 NTU的甲醛聚合物悬浮液作为光通过介质,进行了透光实验。通过将虚拟lia与实际lia SR510的测量结果进行比较,可以知道测量结果的准确性。实验还在明亮和暗室条件下进行,以确定虚拟lia对噪声信号的抑制能力。实验结果表明,与LIA SR510相比,所开发的虚拟LIA测量精度在94%以上。Virtual-LIA可以测量有噪声和无噪声的小信号,在黑暗和明亮条件下测量的平均差异百分比为0.54%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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