红外飞秒激光写入倾斜长周期光纤光栅的传感特性。

Sensing Characteristics of Tilted Long Period Fiber Gratings Inscribed by Infrared Femtosecond Laser.

机构信息

Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.

Guangxi Colleges and Universities Key Laboratory of Microwave and Optical Wave-applied Technology, Guilin 541004, China.

出版信息

Sensors (Basel). 2018 Sep 7;18(9):3003. doi: 10.3390/s18093003.

DOI:10.3390/s18093003

PMID:30205527

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6163470/

Abstract

We propose a novel tilted long period fiber grating (TLPFG) design, inscribed using a line-by-line inscription technique and an infrared femtosecond (Fs) laser. The responses of this TLPFG to external refractive index, temperature, torsion, and strain were systematically investigated to determine its sensing characteristics. The external refractive index (RI) was measured to be -602.86 nm/RIU at an RI of ~1.432. The TLPFG was used to accurately measure temperatures up to 450 °C with a sensitivity of 103.8 pm/°C. The torsion and strain sensitivity of the device were 48.94 nm/(rad/mm) and -0.63 pm/µε, respectively. These results demonstrate that the proposed TLPFG could be used as sensors in a series of application fields including high temperatures and external environments.

摘要

我们提出了一种新颖的倾斜长周期光纤光栅（TLPFG）设计，采用逐行写入技术和红外飞秒（Fs）激光写入。系统研究了该 TLPFG 对外界折射率、温度、扭转和应变的响应，以确定其传感特性。在折射率约为 1.432 时，测量到的外部折射率（RI）为-602.86nm/RIU。该 TLPFG 可用于准确测量高达 450°C 的温度，灵敏度为 103.8pm/°C。该器件的扭转和应变灵敏度分别为 48.94nm/（rad/mm）和-0.63pm/µε。这些结果表明，所提出的 TLPFG 可用于包括高温和外部环境在内的一系列应用领域的传感器。