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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Bragg-Grating-Based Photonic Strain and Temperature Sensor Foils Realized Using Imprinting and Operating at Very Near Infrared Wavelengths
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Bragg-Grating-Based Photonic Strain and Temperature Sensor Foils Realized Using Imprinting and Operating at Very Near Infrared Wavelengths

机译：基于烙印的光子应变和温度传感器箔通过压印实现并在非常近的红外波长下工作

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摘要

Thin and flexible sensor foils are very suitable for unobtrusive integration with mechanical structures and allow monitoring for example strain and temperature while minimally interfering with the operation of those structures. Electrical strain gages have long been used for this purpose, but optical strain sensors based on Bragg gratings are gaining importance because of their improved accuracy, insusceptibility to electromagnetic interference, and multiplexing capability, thereby drastically reducing the amount of interconnection cables required. This paper reports on thin polymer sensor foils that can be used as photonic strain gage or temperature sensors, using several Bragg grating sensors multiplexed in a single polymer waveguide. Compared to commercially available optical fibers with Bragg grating sensors, our planar approach allows fabricating multiple, closely spaced sensors in well-defined directions in the same plane realizing photonic strain gage rosettes. While most of the reported Bragg grating sensors operate around a wavelength of 1550 nm, the sensors in the current paper operate around a wavelength of 850 nm, where the material losses are the lowest. This was accomplished by imprinting gratings with pitches 280 nm, 285 nm, and 290 nm at the core-cladding interface of an imprinted single mode waveguide with cross-sectional dimensions 3 × 3 µm2. We show that it is possible to realize high-quality imprinted single mode waveguides, with gratings, having only a very thin residual layer which is important to limit bend losses or cross-talk with neighboring waveguides. The strain and temperature sensitivity of the Bragg grating sensors was found to be 0.85 pm/µε and −150 pm/°C, respectively. These values correspond well with those of previously reported sensors based on the same materials but operating around 1550 nm, taking into account that sensitivity scales with the wavelength.
机译：薄而柔软的传感器箔非常适合与机械结构无干扰地集成在一起，并允许监控例如应变和温度，同时将这些结构的运行影响降至最低。电应变计已长期用于此目的，但是基于布拉格光栅的光学应变传感器由于其提高的精度，对电磁干扰的敏感性和多路复用能力而变得越来越重要，从而大大减少了所需的互连电缆数量。本文报道了可用于光子应变计或温度传感器的薄聚合物传感器箔片，该传感器箔片使用在单个聚合物波导中多路复用的多个布拉格光栅传感器。与使用布拉格光栅传感器的商用光纤相比，我们的平面方法允许在同一平面内沿明确定义的方向制造多个紧密间隔的传感器，从而实现光子应变计的花环。尽管大多数已报道的布拉格光栅传感器均在1550 nm的波长下运行，但当前纸张中的传感器在850 nm的波长下运行，其中材料损失最低。这是通过在截面尺寸为3×3 µm 2 的压印单模波导的芯-包层界面处压印间距为280 nm，285 nm和290 nm的光栅来实现的。我们表明，用光栅实现高质量的压印单模波导是可能的，该光栅仅具有非常薄的残留层，这对于限制弯曲损耗或与相邻波导的串扰至关重要。发现布拉格光栅传感器的应变和温度灵敏度分别为0.85 pm / µε和-150 pm /°C。考虑到灵敏度与波长成比例，这些值与以前报道的基于相同材料但在1550 nm附近工作的传感器的值非常吻合。

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