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

Guoqing Wang; Liyang Shao; Sankhyabrata Bandyopadhyay; Perry Shen

doi:10.1117/12.2604961

13 December 2021 Ultrafast contactless sensing with remotely placed optical fiber sensors based on in-fiber grating

Guoqing Wang, Liyang Shao, Sankhyabrata Bandyopadhyay, Perry Shen

Proceedings Volume 12075, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Intelligent Sensing Technologies and Applications; 120750H (2021) https://doi.org/10.1117/12.2604961
Event: Tenth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2021), 2021, Chengdu, China

Abstract

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.

Citation Download Citation

Guoqing Wang, Liyang Shao, Sankhyabrata Bandyopadhyay, and Perry Shen "Ultrafast contactless sensing with remotely placed optical fiber sensors based on in-fiber grating", Proc. SPIE 12075, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Intelligent Sensing Technologies and Applications, 120750H (13 December 2021); https://doi.org/10.1117/12.2604961

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KEYWORDS

Fiber Bragg gratings

Polarization

Ultrafast phenomena

Sensing systems

Sensors

Fiber optics sensors

Diffraction

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