کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7926375 1512513 2018 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Interferometric interrogation of π-phase shifted fiber Bragg grating sensors
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Interferometric interrogation of π-phase shifted fiber Bragg grating sensors
چکیده انگلیسی
Interferometric interrogation technique realized for conventional fiber Bragg grating (FBG) sensors is historically known to offer the highest sensitivity measurements, however, it has not been yet explored for π-phase-shifted FBG (πFBG) sensors. This, we believe, is due to the complex nature of the reflection/transmission spectrum of a πFBG, which cannot be directly used for interferometric interrogation purpose. Therefore, we propose here an innovative as well as simple concept towards this direction, wherein, the transmission spectrum of a πFBG sensor is optically filtered using a specially designed fiber grating. The resulting filtered spectrum retains the entire characteristics of a πFBG sensor and hence the filtered spectrum can be interrogated with interferometric principles. Furthermore, due to the extremely narrow transmission notch of a πFBG sensor, a fiber interferometer can be realized with significantly longer path difference. This leads to substantially enhanced detection limit as compared to sensors based on a regular FBG of similar length. Theoretical analysis demonstrates that high resolution weak dynamic strain measurement down to 4 pε∕Hz is easily achievable. Preliminary experimental results are also presented as proof-of-concept of the proposed interrogation principle.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optics Communications - Volume 410, 1 March 2018, Pages 88-93
نویسندگان
, , ,