Ultrafast contactless sensing with remotely placed optical fiber sensors based on in-fiber grating

Wang，Guoqing; Shao，Liyang; Bandyopadhyay，Sankhyabrata; Shen，Perry

10.1117/12.2604961

2021

10th International Symposium on Advanced Optical Manufacturing and Testing Technologies - Intelligent Sensing Technologies and Applications

0277-786X

1996-756X

978-1-5106-5025-1

Proceedings of SPIE - The International Society for Optical Engineering

12075

JUN 14-17, 2021

null,Chengdu,PEOPLES R CHINA

1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA

SPIE-INT SOC OPTICAL ENGINEERING

An ultrafast contactless sensing system with remotely placed optical fiber sensors based on in-fiber grating is presented for the first time. The in-fiber grating, namely 45° tilted fiber grating (45° TFG), is used as 1) a highly efficient waveguide coupler between the compact and portable interrogation elements and the optical fiber sensors; 2) a lateral diffraction grating enables free-space passive beam scattering due to its lateral diffraction feature; 3) an in-fiber polarizer realizes polarization control thanks to its polarization sensitive characteristic. A standard fiber Bragg grating (FBG) sensor, serves as a remotely placed optical sensor, is applied to measure the variations of strain. A Superluminescent light emitting diode (SLED) and a pulsed light beam with a repetition rate of 50MHz from mode-locked laser both are employed as the light sources. The light of interrogation element is coupled into the 45° TFG and serves as the input of the FBG. Reflected light from the FBG sensor is coupled back to the same 45° TFG. Here, the 45° TFG has the merit of inherently compatible with fiber links without insertion loss and hence highly efficiency is achieved. Also, the 45° TFG is employed as the light receiver and transmitter of light at the same time and as the key element fulfill the purpose of ultrafast contactless sensing. The proposal has great potential in ultrafast sensing applications with the benefit of contactless and a proof-of-principle demonstration of the proposed system for strain sensing application have been successfully presented.

Fiber Bragg grating In-fiber grating Interrogation element Optical fiber sensors

第一 ; 通讯

英语

CPCI-S ; EI

Engineering ; Optics

Engineering, Manufacturing ; Optics

WOS:000797353800016

20220911705510

Diffraction ; Fiber optic sensors ; Light sources ; Polarization

Fiber Optics:741.1.2

2-s2.0-85125044482

Scopus

Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China

Wang，Guoqing,Shao，Liyang,Bandyopadhyay，Sankhyabrata,et al. Ultrafast contactless sensing with remotely placed optical fiber sensors based on in-fiber grating[C]. 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA:SPIE-INT SOC OPTICAL ENGINEERING,2021.