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Highly accurate phase demodulation algorithm for white light interference
DOI:10.1016/j.yofte.2025.104248.png)
摘要
En 中文
在传统的白光干涉相位解调技术(T-WLPDT)中,由延迟时间引起的精度问题一直存在。为将失真程度控制在一定范围内,不可避免地需要牺牲工作带宽。本文推导了T-WLPDT解调信号输出与真实信号的比值,并将其表述为补偿因子(CF)。随后将CF应用于补偿T-WLPDT输出的光谱信号,从而实现高精度解调并扩展工作带宽。实验结果表明,与T-WLPDT相比,补偿后的白光干涉相位解调技术(C-WLPDT)的带宽扩展了16 dB(6.28倍),失真率限制在1.69%。此外,研究分析了白光干涉在解调低频大相位-幅度信号时的相位压缩优势。在解调100 Hz信号时,C-WLPDT表现出41 dB(108.1倍)的相位压缩,能够测量比窄线宽激光相位解调技术(NLPDT)更大的相位-幅度信号。该工作对于提高白光干涉的测量精度具有重要意义,并促进其在传感领域的更广泛应用。同时,C-WLPDT的相位压缩性能为检测低频大相位-幅度信号提供了一种思路。
Keyword:
White light interference
Demodulation accuracy
Operating bandwidth
Phase compression
期刊
IF:
2.7
论文数:
696
被引数:
6.1K
机构
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