9.3 Pressure Sensitive Paint
207
Fig. 9.11 Response to a light excitation of a molecule of the PSP active component
Fig. 9.12 Oxygen diffusion in the PSP coating
the surface temperature and the pressure. The temperature increases the irradiative
deactivation rate and results in a lower intensity. The active molecules are embedded
in a matrix controlling the diffusion of oxygen in the paint, silicone polymers being
often used because of their high permeability (see Fig. 9.12).
The PSP coating, which additionally includes a screen layer and a tie-layer, must
be smooth, uniform and adhere perfectly to the surface (see Fig. 9.13).
9.3.2 Relation Between the Pressure and the Luminous
Intensity
The relation between pressure, p, and luminous intensity, I, is given by the SternVolmer equation:
I 0
I
= A + B
p
p o
where I 0 is the luminous intensity emitted at a reference pressure, p o , (condition
without flow most often).
207
Fig. 9.11 Response to a light excitation of a molecule of the PSP active component
Fig. 9.12 Oxygen diffusion in the PSP coating
the surface temperature and the pressure. The temperature increases the irradiative
deactivation rate and results in a lower intensity. The active molecules are embedded
in a matrix controlling the diffusion of oxygen in the paint, silicone polymers being
often used because of their high permeability (see Fig. 9.12).
The PSP coating, which additionally includes a screen layer and a tie-layer, must
be smooth, uniform and adhere perfectly to the surface (see Fig. 9.13).
9.3.2 Relation Between the Pressure and the Luminous
Intensity
The relation between pressure, p, and luminous intensity, I, is given by the SternVolmer equation:
I 0
I
= A + B
p
p o
where I 0 is the luminous intensity emitted at a reference pressure, p o , (condition
without flow most often).