Digital lock-in algorithm for biomedical spectroscopy and imaging instruments with multiple modulated sources.
Digital lock-in algorithm for biomedical spectroscopy and imaging instruments with multiple modulated sources.
复制标题
用于具有多个调制源的生物医学光谱和成像仪器的数字锁定算法。
DOI：
10.1109/iembs.2006.259303
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Hielscher,AH
中科院分区：
文献类型：
--
作者：
Masciotti,JamesM;Lasker,JM;Hielscher,AH
数字锁定检测为光谱和成像仪器提供了一种测量物理量的方法，与模拟检测方案相比，该方法具有改善的信噪比。我们介绍了一种数字锁相检测算法，通过使用特定的调制和采样约束和平均滤波器同时测量多个幅度调制信号的幅度和相位。该技术具有特殊的减少噪声和源间失真。结果表明，数字锁定技术可以作为一个简单的矩阵乘法，以减少计算时间。在一定的采样和调制条件下，对数字锁定算法进行了描述和分析。结果显示为实验数据
Digital lock-in detection provides spectroscopic and imaging instruments a means of measuring physical quantities with improved signal to noise ratios compared to analogue detection schemes. We introduce a digital lock-in detection algorithm for measuring the amplitude and phase of multiple amplitude modulated signals simultaneously by using particular modulation and sampling constraints and averaging filters. The technique exhibits exceptional reduction in both noise and inter-source distortion. It is shown that the digital lock-in technique can be performed as a simple matrix multiplication in order to reduce computation time. The digital lock-in algorithm is described and analyzed under certain sampling and modulation conditions. Results are shown for experimental data