Advanced chromatic confocal optical coherence tomography sensor with switchable acquisition modes

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology Pub Date : 2024-11-22 DOI:10.1016/j.optlastec.2024.112182

Zhun Wang, Zihao Ni, Yulei Bai, Shengli Xie, Bo Dong

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引用次数: 0

Abstract

A fiber optic sensor combining the principle of chromatic confocal and spectral-domain optical coherence tomography (OCT) has been developed to simultaneously measure film thickness and refractive index. By capturing a spectrum that composed of the low-frequency confocal signal and the high-frequency interference signal, the sensor can initially estimate the confocal thickness and optical thickness of the tested film. Further, by combining the parameter of sensor system, the geometric thickness and refractive index of the film can be subsequently calculated. Additionally, an acquisition mode switching method and a covariance algorithm-based method were also presented to overcome the decrease in signal-to-noise ratio (SNR) induced by signal separation and the reduction in resolution caused by bandwidth narrowing. For validation, five PVC films with different thickness (0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, and 0.5 mm) and five 0.1 mm thickness films with different materials (PVC, PC, PMMA, PET, and FEP) were measured by the sensor. The results indicate that the absolute errors in thickness and refractive index measurements of the sensor are less than 2.5 % and 3.0 %, respectively.

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可切换采集模式的先进色度共焦光学相干断层成像传感器

我们开发了一种结合了色度共焦原理和光谱域光学相干断层扫描（OCT）原理的光纤传感器，可同时测量薄膜厚度和折射率。通过捕捉由低频共焦信号和高频干涉信号组成的光谱，传感器可以初步估算出被测薄膜的共焦厚度和光学厚度。此外，结合传感器系统的参数，还可以计算出薄膜的几何厚度和折射率。此外，还提出了一种采集模式切换方法和一种基于协方差算法的方法，以克服信号分离引起的信噪比（SNR）下降和带宽变窄引起的分辨率下降。为进行验证，传感器测量了五种不同厚度（0.1 毫米、0.2 毫米、0.3 毫米、0.4 毫米和 0.5 毫米）的 PVC 薄膜和五种不同材料（PVC、PC、PMMA、PET 和 FEP）的 0.1 毫米厚度薄膜。结果表明，传感器测量厚度和折射率的绝对误差分别小于 2.5 % 和 3.0 %。

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来源期刊

Optics and Laser Technology 物理-光学

CiteScore

8.50

自引率

10.00%

发文量

1060

审稿时长

3.4 months

期刊介绍： Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems