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Self-Calibration Method for the Four Buckets Phase Demodulation Algorithm in Triangular Wave Hybrid Modulation
DOI:10.3390/app152010956.png)
摘要
En 中文
四桶相位解调方法是一种在干涉测量中广泛使用的正弦调制与解调技术。严格的标定对于最小化后续测量中的非线性误差至关重要。该算法标定的核心在于确定与调制深度匹配的调制信号初始相位值,同时克服系统相位延迟的影响。目前,专门针对光纤干涉测量的系统性标定方法较少。本文提出了一种基于三角波混合的四桶相位解调光纤干涉测量探针自标定方法,该方法在待测物体静止状态下,能够高效实现相位解调的自标定。仿真和实验验证表明,在静态条件下,相位解调的初始相位最优值0.62 rad能够被准确识别。随后将该标定后的相位值应用于位移测量,有效检测到目标位移,结果均方根(RMS)误差为3.0337 nm,平均误差为2.4479 nm。
Keyword:
four buckets
static displacement
calibration method
fiber optic interferometry measurement
nonlinear error
期刊
A
IF:
2.5
论文数:
7.6K
被引数:
4
机构
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