scholarly journals Dual Wavelength Differential Detection of Fiber Bragg Grating Sensors with a Pulsed DFB Laser

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4766
Author(s):  
François Ouellette ◽  
Zhonghua Ou ◽  
Jianfeng Li
Keyword(s):  
Fiber Bragg Grating ◽  
Single Pulse ◽  
Dual Wavelength ◽  
Bragg Grating ◽  
Differential Detection ◽  
Fiber Bragg Grating Sensors ◽  
Nanosecond Pulses ◽  
Dfb Laser ◽  
Reflected Power ◽  
Prototype Instrument

We show how dual wavelength differential detection can be used to measure fiber Bragg grating sensors using nanosecond pulses from a single DFB laser diode, by taking advantage of its dynamic chirp. This can be performed in two ways: by measuring the reflected power from two separate pulses driven by two different currents, or by taking two delayed digitized samples within a single pulse. A prototype instrument using fast digitizing and processing with an FPGA is used to characterize the chirp, from which the performance can be optimized for both measurement schemes.

A tunable dual-wavelength fiber Bragg grating laser using an external-injected DFB laser

2015 ◽  
Vol 11 (3) ◽  
pp. 184-186 ◽  
Author(s):  
Kai-qiang Huang ◽  
Yong Wang ◽  
Qi Li ◽  
Chun-xiong Huang ◽  
Hai-yan Chen
Keyword(s):  
Fiber Bragg Grating ◽  
Dual Wavelength ◽  
Bragg Grating ◽  
Dfb Laser

scholarly journals Fiber Bragg Grating Sensors for Underwater Vibration Measurement: Potential Hydropower Applications

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4272
Author(s):  
Oscar de la Torre ◽  
Ignazio Floris ◽  
Salvador Sales ◽  
Xavier Escaler
Keyword(s):  
Fiber Bragg Grating ◽  
Numerical Models ◽  
Vibration Measurement ◽  
Quality Data ◽  
Bragg Grating ◽  
Laser Vibrometer ◽  
Main Concern ◽  
High Expectations ◽  
Fiber Bragg Grating Sensors ◽  
Hydraulic Machinery

The present paper assesses the performance and characteristics of fiber Bragg grating sensors, with a special interest in their applications in hydraulic machinery and systems. The hydropower industry is turning to this technology with high expectations of obtaining high quality data to validate and calibrate numerical models that could be used as digital twins of key assets, further strengthening the sector’s relevant position within industry 4.0. Prior to any validation, fiber Bragg grating sensors’ ability to perform well underwater for long periods of time with minimal degradation, and their ease of scalability, drew the authors´ attention. A simplified modal analysis of a partially submerged beam is proposed here as a first step to validate the potential of this type of technology for hydropower applications. Fiber Bragg grating sensors are used to obtain the beam’s natural frequencies and to damp vibrations under different conditions. The results are compared with more established waterproof electric strain gauges and a laser vibrometer with good agreement. The presence of several sensors in a single fiber ensures high spatial resolution, fundamental to precisely determine vibration patterns, which is a main concern in this industry. In this work, the beam’s vibration patterns have been successfully captured under different excitations and conditions.

Estimating needle-tissue interaction forces for hollow needles using fiber Bragg grating sensors

2016 ◽  
Author(s):  
Saurabh Kumar ◽  
V. Shrikanth ◽  
Bharadwaj Amrutur ◽  
Sundarrajan Asokan ◽  
M. S. Bobji
Keyword(s):  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Interaction Forces ◽  
Tissue Interaction ◽  
Fiber Bragg Grating Sensors
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