12. H
12
Transient Response of Thin Plate
Fdt ( ) c Vdtbefore after
m v v 2before
v gH
( )
Vdt
before after
m v v
c
0
13. 13
Transient Response of Strain forThin Plate
The strain of FBG
Simulation middle point
Theory of C.Y. Liao (2016)
Transient strain of cantilever plate
2
11 2
2
0 0 0
22
1
0 0
sin, ,
t
ii i
a b
ii i
w
z
x
F t dW x y W x y
z
h xW dxdy
14. 14
FBG Immersed in Water
233mm
143mm
207mm
E=69GPa 0.33v 32705kg
m
18. Page 18
Water Pressure Measurements
Steel ball freely fall and strike the water box system
• Large steel ball : D=12.71mm
• Middle steel ball : D= 9.51mm
• Small steel ball : D= 6.35mm
From 150cm above
the water surface
FBG pressure sensor IV
30cm
30cm
11cm
7cm
FBG
15cm15cm
Strike point
21. Page 21
Water Pressure Measurements
Steel ball freely fall and strike the water box system
• Large steel ball : D=12.71mm
• Middle steel ball : D= 9.51mm
• Small steel ball : D= 6.35mm
From 50cm above
the water surface
Large steel ball
0.336 sec
35. Impact force history
PVDF film
Impact force history
Choose three impact points to testify the ability of
FBG strain sensors
FBG Sensor 1 FBG Sensor 2
FBG Sensor 3
Impact force history
35
190 mm
75.4mm
FBG
Sensor 1
x
y
z
FBG Sensor 3
60 mm
PVDF 1
PVDF 2
PVDF 3
41. Temperature converting factor of bare FBG
41
Temperature: 0.0098nm/℃
Immerse bare FBG sensor and thermocouple into the water
which is heated by hot plate to acquire the temperature
converting factor.
42. Strain difference of Lithium-ion battery
2.6
2.8
3.0
3.2
3.4
3.6
-2
0
2
4
6
8
10
12
14
16
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
-150
-100
-50
0
50
100
150
200
voltageCStrain() Time (hour) 42
B TK K T
:
: .T
K strain sensitivity of wavelength
K temp sensitivity of wavelength
Resonance wavelength drift theory with Photo-elastic
and thermo-optic effect :
Dynamic Sensitivity of sensors
43. In-situ monitoring the strain evolution of graphite electrode during
charging and discharging process
43
I-MON
Interrogation monitors
3×1 coupler
Li-ion battery
Circulator
ASE light source
PC
PCD-300
Chroma
Regenerative battery pack test system
• Chroma’s Regenerative battery pack test system model 17020
which is utilized for the investigation of a continuous cycling
test
• A flexible programming recipe operated by a powerful Battery
Pro software to create cycling tests
45. Temperature and internal pressure monitoring
45
Temperature : (external) Thermocouple
(internal) FBG with stainless steel tube
The maximum of temperature difference is 6 °C
The maximum of the internal pressure is 9kPa
47. 溫度及變形訊號之解耦合
1
B
B
K
T
T
K T T
K
裸光纖+套管裸光纖
1
1
1 T
T
K
2
2
2 T
T
K
1 2T T T (應變貢獻的) TK T K
TK
T
K
光纖光柵感測器:量測原理、系統架設