FEDSM2000-11043 datasheet(5/8 Pages) ETC

Part #	FEDSM2000-11043

Description	DUAL EMISSION LASER INDUCED FLUORESCENCE TECHNIQUE (DELIF) FOR OIL FILM THICKNESS AND TEMPERATURE MEASUREMENT

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Consequently, film thickness cannot be inferred from

fluorescence

intensity unless

illumination intensity at a

particular location and time is known.

The ratio of the

illumination intensity and the fluorescence intensity, however, is

independent of spatial and temporal variations in excitation

light intensity.

R(t,

R

I

o

f

=

≡

)

16

(

Obtaining illumination intensity is not trivial.

A two-

dimensional instantaneous illumination map, however, can be

inferred from the fluorescence of a second dye. This is the

principle behind DELIF:

(1) the fluorescence of dye 1 in a two-dye system contains

the desired information (film thickness, temperature,

which will be discussed later), along with exciting light

intensity information.

(2) the fluorescence of dye 2 also contains the exciting

light intensity information but behaves differently than

dye 1 to the scalar of interest.

(3) By rationing the fluorescence of dye 1 with the

fluorescence of dye 2, the excitation light information

is canceled out, giving a ratio that contains only the

desired scalar information.

Oil Film Thickness

Oil film thickness measurements are achieved using an

optically thick system that takes advantage of reabsorption. The

film thickness information is contained in the reabsorption of

the fluorescence of dye 1 by dye 2.

The excitation light

intensity information is contained both in the fluorescence of

dye 1 and dye 2. If two narrow-band interference filters are

used to capture the two distinctive fluorescence emissions, an

emission intensity defined by

2

1

2

1

C

)

(

C

)

(

C

)

(

(y,

I

y,

,

’(t,

I

filter

laser

filter

laser

o

filter

f,

+

=

[]

{}

()t

C

)

(

C

)

filter

laser

2

1

2

exp

1

+

−

×

)

17

(

C

)

(

C

)

(

(y,

I

y,

,

(t,

I

laser

filter

laser

o

filter

f,

2

=

[]

{}

()t

C

)

laser

−

× exp

1

)

18

(

)

(

C

)

(

)

(

C

)

(

I

)

,

R(t,

filter

laser

filter

laser

f,

filter

2

1

2

1

2

1

’

=

[]

{}

()

[]

[

]

{}

()t

C

)

C

)

(

C

)

t

C

)

(

C

)

C

)

laser

filter

laser

filter

laser

−

+

−

×

exp

1

exp

1

(

2

1

2

1

2

)

19

(

.

is obtained.

By taking the ratio of the emission of the two dyes, the

excitation light intensity dependence is cancelled leaving a ratio

that is only dependent on film thickness. As film thickness

information is contained in the reabsorption of the fluorescence

of dye 1 by dye 2, the system must be optically thick, in order

for the reabsorption to be substantial and measurable (Fig. 6).

Figure 6: Film thickness ratio

Temperature

It is possible to use LIF as a temperature indicator when

there is a dependence of either the molar absorption (extinction)

or quantum efficiency coefficients on temperature.

7

=

)

20

(

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