基于光路补偿的数字全息干涉法测量液相扩散系数
收稿日期: 2020-07-13
修回日期: 2021-02-14
网络出版日期: 2021-09-24
基金资助
国家自然科学基金(61975058)资助
Measurement of liquid diffusion coefficient by digital holographic interferometry based on optical path compensation
Received date: 2020-07-13
Revised date: 2021-02-14
Online published: 2021-09-24
黄子珊 , 林佳茂 , 翁佳炫 , 邓军灿 , 陈俊旭, 彭 力 . 基于光路补偿的数字全息干涉法测量液相扩散系数[J]. 大学物理, 2021 , 40(9) : 76 . DOI: 10.16854 / j.cnki.1000- 0712.210094
industrial production. In this paper, based on the optical path compensation method, the
Mach-Zehnder interferometric optical path is used
to measure the liquid diffusion coefficient. The object light and the reference light of a laser
holographic interference path passed through the diffusion groove and the compensation groove
respectively. When the liquid to be measured
diffused in the diffusion groove, the interference pattern would change. The diffusion
coefficient can be obtained by
image processing of two interference patterns at different times by fringe
discrimination method. Wavelet deposing
and frequency-domain filtering are required for image processing. After the interference
patterns at different times are superimposed after filtering, the phase changes are obtained
by phase discretization of the superimposed images using the least square phase unwrapping
algorithm of DCT transform. The liquid phase diffusion coefficient can be
obtained by reading the distance between the maximum concentration changes.
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