Presentation Poster for Final Year Project

1. CONCLUSION
OBJECTIVES
PROBLEM STATEMENT
Fiber Bragg Grating Dynamic
Pressure Transducer
Kee Li Voon, Dr. Mohd Hafizi Bin Zohari
Advanced Structural Integrity and Vibration Research (ASIVR) Group ● Faculty of Mechanical Engineering
University Malaysia Pahang ● Pekan ● Pahang ● Malaysia
http://www.usq.edu.au/ceefc
SCOPE
EXPERIMENTAL RESULTS
• To test and evaluate the feasibility of designed diaphragm-type transducer to
monitor dynamic response of fast changing pressure in a pipeline.
• This involved an FBG sensor application to replace a conventional strain gauge
pressure transducer to improve the performance in dynamic sensing.
• To design and develop a Fiber Bragg Grating (FBG) dynamic pressure transducer.
• To investigate the reliability of the dynamic pressure transducer.
Conventional dynamic pressure transducer is using a metal foil strain gauge to detect
the pressure change in fluid flow .However, there are some drawback:
• Large size
• Limited temperature range
• Low sensitivity
• Very sensible to temperature and electromagnetic field
• Has a difficulty when bonds it to the diaphragm by adhesive, an imperfect bonding
between the sensor and the structure will result in poor dynamic pressure sensing with
significant effects.
• Unable to perform long distance due to signal loss.
BASIC WORKING PRINCIPLE OF FBG
EXPERIMENTAL SET UP
INTRODUCTION
• In this project, the study and instrumentation of dynamic pressure in fluid flow will
be done using a dynamic pressure transducer.
• A diaphragm type transducer will be used as a primary sensing element which
transformed the pressure detected to elastic deformation .
• Secondary sensing element is attached on the diaphragm to detect the deformation
and convert the mechanical deformation to electrical signal for data transmission and
processing.
• Deployment of Fiber Bragg gratings (FBG) in dynamic sensing as it offers numbers
of advantages over other sensors.
• It is light weight, multiplexed, immune to electromagnatic interference, durable
under high pressure and temperature yet inexpensive to produce.
FBG INTERROGATION SYSTEM
0 bar 1 bar 2 bar
References:
Majumder, M., Gangopadhyay, T. K., Chakraborty, A. K., Dasgupta, K., & Bhattacharya, D. K. (2008). Fibre Bragg gratings in structural health monitoring—Present status and applications. Sensors and Actuators A: Physical, 147(1), 150-164.
Tsuda, H. (2006). Ultrasound and damage detection in CFRP using fiber Bragg grating sensors. Composites science and technology, 66(5), 676-683.
Rao, Y.-J. (1997). In-fibre Bragg grating sensors. Measurement science and technology, 8(4), 355.
Rao, Y.-J. (1998). Fiber Bragg grating sensors: principles and applications Optical fiber sensor technology (pp. 355-379): Springer.
Wang, T., Yuan, Z., Gong, Y., Wu, Y., Rao, Y., Wei, L., . . . Wan, F. (2013). Fiber Bragg grating strain sensors for marine engineering. Photonic Sensors, 3(3), 267-271.
Wang, Y., Wang, M., & Huang, X. (2010). High-sensitivity fiber Bragg grating transverse force sensor based on centroid measurement of polarization-dependent loss. Measurement science and technology, 21(6), 065304.
LI, C.-j., LIU, R.-x., & WANG, J.-z. (2006). Design of the Monitor Platform Based on the Principle of Sensor Network [J]. Chinese Journal of Sensors and Actuators, 1, 002.
PRESSURE TRANSDUCER
A diaphragm-type FBG dynamic pressure transducer performance has been
presented and realized. From the experimental results, it has a pressure sensitivity
as high as 1.216 pm/kPa and a good linearity of 0.9991%. It has possible potential
in many applications for quasi-distributed pressure measurement in civil
engineering and oil and gas industry.
STRAIN
TEMPERATURE
GRATING PERIOD CHANGES
BRAGG GRATING
REFLECTED WAVELENGTH SHIFT
ASE
LIGHT
SOURCE
OPTICAL
CIRCULATOR
FBG FILTER
NI-DAQ
PD
ADAPTER
PHOTODETECTOR
FBG
SENSOR
*SHADED REGION= PORTION OF WAVELENGTHS TRANSMITTED TO THE PHOTODETECTOR
OPTICAL SIGNAL ELECTRICAL SIGNAL
OPTICAL RESPONSE
REPEATABILITY RESPONSE
ELECTRICAL RESPONSE
DYNAMIC RESPONSE
SENSOR
OSA
MATCHED EDGE
INTERROGATION
SYSTEM
AIR COMPRESSOR
LAPTOP
BASE DIAPHRAGM