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參數(shù)資料
| 型號(hào)： | FEDSM2000-11043 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | DUAL EMISSION LASER INDUCED FLUORESCENCE TECHNIQUE (DELIF) FOR OIL FILM THICKNESS AND TEMPERATURE MEASUREMENT |
| 中文描述： | 雙發(fā)射激光誘導(dǎo)熒光技術(shù)（DELIF）的油膜厚度和溫度測(cè)量 |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大?。?/td> | 190K |
| 代理商： | FEDSM2000-11043 |
4
Copyright 2000 by ASME
one dye by another can be neglected. This is not the case for
the reduction in fluorescence of a dye due to reabsorption by a
second dye since this reduction can be substantial in
comparison with the total emission of the dye when there is no
reabsorption. From the differential element of figure 3, it is
apparent that the differential fluorescence emission produced by
any single element must travel back through the medium before
reaching the CCD.
f
η
)
wavelength
m
ε
)
wavelength
Figure 4: Emission and absorption spectrums
Figure 5: Reabsorption schematic
If there is reabsorption of the differential element
fluorescence, Lambert’s law must be applied to the differential
fluorescence emission in order to compute the actual
fluorescence collected by the CCD. Thus, assuming the
situation represented in figure 5 occurs,
[
]
d
dx
)
(
C
)
(
x
C
)
I
dI
laser
laser
o
f,
1
1
1
1
1
exp
=
)
[
]
x
2
C
)
(
dI
’
dI
f,
f,
2
1
1
exp
=
)
10
(
[
]
)
(
C
)
(
x
C
)
I
’
dI
laser
laser
o
f,
1
1
1
1
1
exp
=
[
]
d
dx
x
C
)
(
2
2
exp
×
)
11
(
Equation (5) has been modified in equation (9) to reflect
the fact that the fluorescence emission occurs over a wide range
of wavelengths that constitute the emission spectrum. In the
same way equations (10) and (11) portray a reabsorption that
occurs over a wide range of wavelengths. If the emission
spectrum of dye 1 and the absorption spectrum of dye 2 are
known, equation (11) can be integrated over varying film
thickness and wavelengths in order to compute the total
intensity collected by the CCD. If a very narrow interference
filter is used to filter all wavelengths except for the one of
interest, equation (11) can be simplified by removing the
dependence of the differential intensity on the emission and
absorption spectrums. Thus, the total intensity collected on the
CCD can be calculated as:
[
∫
=
o
filter
f,
I
)
’(t,
I
0
1
1
exp
]
t
laser
laser
C
)
(
x
C
)
1
1
1
[
]
dx
x
C
)
(
)
(
filter
filter
2
1
2
1
1
exp
×
)
12
(
2
1
2
1
1
1
1
1
1
1
C
)
(
C
)
)
(
C
)
+
(
I
)
’(t,
I
filter
laser
filter
laser
o
filter
f,
=
[
]
{
}
(
1
)
t
C
)
(
C
)
filter
laser
2
1
2
exp
+
×
)
13
(
For reabsorption to play a significant role on the
fluorescence, the system must be optically thick and
ε
2
(
λ
filter1
)C
2
>
≈
O[
ε
(
λ
laser
)C
].
DELIF, THE RATIOMETRIC APPROACH
Principle
In the previous analysis, based on figure 3, and in equations
(1) through (13), the non-uniformity of the exciting light
intensity over the plane of observation and in time is not taken
into consideration. In reality, illumination intensity is a function
of both position and time;
(y,
I
I
o
Therefore,
y,
(t,
I
I
f
o
=
)
14
(
f
=
)
15
(
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