Study on the use of optical coherence tomography in measurements of paper properties
Study on the use of optical coherence tomography in measurements of paper properties
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DOI：
10.1088/0957-0233/16/5/012
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发表时间：
2005-05-01
影响因子：
2.4
通讯作者：
Myllylä, R
中科院分区：
文献类型：
--
作者：
Alarousu, E;Krehut, L;Myllylä, R
本研究提出了一种表征纸张表面和体结构的新方法：光学相干层析成像（OCT）。虽然这种技术已经在医学上使用多年，但在造纸工业中仍然相对不为人所知。首先，我们简要介绍了一种用于纸张OCT成像的传统pc控制测量系统。在该装置中，使用一个强大的超发光二极管来照射具有自由空间结构的迈克尔逊干涉仪，并在光延迟线中放置一个压电换能器来调制测量信号以进行光外差检测。然后应用该设置来演示该技术使用单个设备可视化广泛不同纸张样品表面结构的能力。接下来，论文提供了光纤网络和典型复印纸的三维图像。结果证明，只要使用合适的清除剂，OCT不仅适用于简单木纤维网络的三维成像，也适用于复杂商业票据的成像。最后，通过对样品的多次a扫描进行平均计算，证明了滤波器对OCT信号斜率的影响，表明填充物含量的增加会导致a扫描深度衰减的相应减少。
This study proposes a new method for the characterization of paper surface and bulk structure: optical coherence tomography (OCT). Although having been used in medicine for years, this technique is still relatively unknown in the paper-making industry. First, we provide a brief description of a conventional PC-controlled measurement system for the OCT imaging of paper. In this set-up, a powerful superluminescent diode is used to illuminate a Michelson interferometer with a free-space configuration, and a piezo-transducer is placed in the optical delay line to modulate the measurement signal for optical heterodyne detection. The set-up is then applied to demonstrate the ability of the technique to visualize the surface structures of widely disparate paper samples using a single device. Next, the paper provides 3D images of a fibre network and of typical copy paper. The results prove that OCT is applicable not only to the 3D imaging of simple wood fibre networks, but also to the imaging of complex commercial paper, provided that an appropriate clearing agent is used. Finally, the effect of filter on the OCT signal slope calculated by averaging several A-scans from the sample is demonstrated, showing that increasing filler content produces a corresponding decrease of decay of the A-scan in depth.