Excitation Emission Detector long-pass filter luminescent probe

Excitation Emission Detector long-pass filter luminescent probe
Temperature-Sensitive Paint
High resolution non-intrusive measurements of temperature and heat transfer using
temperature sensitive paint have been demonstrated by several researchers1 2. A typical TSP
consists of the luminescent molecule and an oxygen impermeable binder. The basis of the
temperature sensitive paint method is the sensitivity of the luminescent molecules to their
thermal environment. The luminescent molecule is placed in an excited state by absorption of a
photon. The excited molecule deactivates through the emission of a photon. A rise in
temperature of the luminescent molecule will increase the probability that the molecule will
return to the ground state by a radiationless process, this is known as thermal quenching. The
temperature of the painted surface can be measured by detecting the fluorescence intensity of the
luminescent paint.
The luminescent intensity of the temperature sensitive paint at a given point is not only a
function of temperature. For practical applications of TSP spatial variations in illumination,
probe concentration, paint layer thickness, and camera sensitivity will result in a variation in the
detected luminescent intensity from the test surface. These spatial variations are eliminated by
taking the ratio of the luminescent intensity of the paint at the unknown test condition (wind off)
with the luminescent intensity of the paint at a known reference condition (wind on). This is
identical to the procedure utilized for pressure-sensitive paints. The experimental setup for
temperature-sensitive paints is similar to that for pressure-sensitive paints and is shown in Figure
1. A calibration of typical temperature-sensitive paint is shown in Figure 2.
Excitation
Detector
D a
CC mer
Ca
LED Array
470 nm
CCD
Emission
(>590 nm)
luminescent
probe
long-pass
filter
polymer binder
model
surface
Figure 1 Basic Temperature-Sensitive Paint system.
1
Figure 2 ISSI UniTemp. Simple application and storage (shipped in a spray paint can) and long shelf life.
Exhibits good temperature sensitivity (1% per K) and is not sensitive to pressure. Broad excitation
spectrum (400-nm to 520-nm) Range of operation 280 K to 370 K.
Contact Information
Innovative Scientific Solutions, Inc.
2766 Indian Ripple Road Dayton OH 45440
Phone: (937) 429-4980 x107
Email: [email protected]
Web: www.innssi.com
References
1
T. Liu, B.T. Campbell, S.P. Burns, J.P. Sullivan, "Temperature- and Pressure-Sensitive Luminescent Paints in
Aerodynamics", Applied Mechanics Reviews, vol. 50, pp.227-246, (1997)
2
K. Navarra, D. Rabe, S. Fonov, L. Goss, C. Hah, “The Application of Pressure and Temperature Sensitive Paints
to an Advanced Compressor”, Journal of Turbomachinery, vol. 123, n 4, pp. 823-829, (2001)
2
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement