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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 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 190K |
| 代理商： | FEDSM2000-11043 |
7
Copyright 2000 by ASME
EXPERIMENTAL AND RESULTS
A two-12-bit-camera system was implemented in order to
simultaneously capture the two fluorescence intensities (see
figure 8). Dichroic mirrors and interference filters were used to
separate the laser intensity from the fluorescence and the
particular fluorescence emissions from each other. For oil film
thickness measurements, the oil was mixed with Pyrromethene
567 and Pyrromethene 650, and for temperature measurements
the combination of Pyrromethene 567 and Rhodamine 640 was
implemented. Two optical flats were placed on top of each
other with a 110 mm thick shim placed between them at one of
the ends. This produces a linearly increasing oil film thickness.
camera 1
camera 2
570 nm
dichroic
600 nm
dichroic
incoming laser
fluorescence 1 (567 nm)
fluorescence 2 (650 nm)
sample
Figure 8: Experimental setup schematic
Figure 9 shows the two simultaneous fluorescence pictures
(Pyrromethene 567 and Pyrromethene 650) of the oil film
contained between the optical flats and their ratio. It becomes
apparent how the ratiometric technique eliminates the
fluorescence intensity variations due to the irregular laser
intensity profile. Figure 10 depicts the change in fluorescence
intensity with temperature for both Pyrromethene 567 and
Rhodamine 640, and their ratio. In addition, it can be seen in
Figure 11 how the ratiometric technique eliminates the laser
intensity and film thickness variation, leaving only temperature
information.
Film Thickness
0
1000
2000
3000
10
35
Thickness (micrometers)
Pyr 650 (620 Filter)
60
85
110
R
Pyr 567 (570 Filter)
Ratio
Figure 9: DELIF for oil film thickness measurement
Fluorescence vs. Temperature
0
50
100
150
200
250
20
70
Temperature (C)
120
170
R
I
Rhod 640 (620 Filter)
Pyr 567 (570 Filter)
Ratio
Figure 10: Fluorescence versus temperature
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