Compact high-resolution FBG strain interrogator based on laser-written 3D scattering structure in flat optical fiber.
Compact high-resolution FBG strain interrogator based on laser-written 3D scattering structure in flat optical fiber.
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DOI：
10.1038/s41598-023-35708-1
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发表时间：
2023-05-31
影响因子：
4.6
通讯作者：
Beresna, Martynas
中科院分区：
文献类型：
--
作者：
Falak, Przemyslaw;Lee, Timothy;Zahertar, Shahrzad;Shi, Bo;Moog, Bruno;Brambilla, Gilberto;Holmes, Christopher;Beresna, Martynas
我们展示了一种基于散射介质的光纤布拉格光栅（FBG）应变计，以产生稳定和确定性的散斑图案，用施加的应变进行校准，这高度依赖于FBG背反射光谱分量。散斑图案的强波长依赖性先前用于高分辨率波长计，其中散射有效地折叠光路，但不稳定性使得这种装置的实际实现困难。在这里，一种新的方法，证明了利用飞秒激光写入的散射体内的扁平光纤，以提高机械稳定性。通过将15个平面的伪随机化纳米空隙（每个平面714 500个空隙）作为3D阵列在1 0.7 0.16 mm的体积中写入，改善了器件的固有稳定性和紧凑性。作为波长计操作，它在1040-1056 nm的波长范围内保持稳定至少60 h，分辨率为45 pm。作为反射模式FBG光栅，在通过向FBG施加拉伸应变来校准散斑图案之后，该装置能够检测0-200范围内的微应变变化，标准误差为4，受平移台步长的限制。所有这些特性使其成为一种有趣的技术，用于填补低成本，高分辨率波长计和询问器的利基市场，提供分辨率，紧凑性，价格和稳定性之间的最佳权衡。
We demonstrate a fiber Bragg grating (FBG) strain interrogator based on a scattering medium to generate stable and deterministic speckle patterns, calibrated with applied strain, which are highly dependent on the FBG back-reflection spectral components. The strong wavelength-dependency of speckle patterns was previously used for high resolution wavemeters where scattering effectively folds the optical path, but instability makes practical realization of such devices difficult. Here, a new approach is demonstrated by utilizing femtosecond laser-written scatterers inside flat optical fiber, to enhance mechanical stability. By inscribing 15 planes of pseudo-randomized nanovoids (714 500 voids per plane) as a 3D array in a 1 0.7 0.16 mm volume, the intrinsic stability and compactness of the device was improved. Operating as a wavemeter, it remained stable for at least 60 h with 45 pm resolution over the wavelength range of 1040–1056 nm. As a reflection mode FBG interrogator, after calibrating speckle patterns by applying tensile strain to the FBG, the device is capable of detecting microstrain changes in the range of 0–200 with a standard error of 4 , limited by the translation stage step size. All these characteristics make it an interesting technology for filling the niche of low-cost, high-resolution wavemeters and interrogators which offer the best available trade-off between resolution, compactness, price and stability.
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