The photodegradation that occurs in pressure-sensitive paint (PSP) is one of the serious error sources for pressure measurements using PSP. The aim of the present work is to examine the photodegradation properties of porous-type PSPs with three luminescent dyes (pyrene-butyric acid (PBA), bathophenanthroline ruthenium (II) complex (Ru(Ph2-phen)) and meso-tetra(pentafluorophyenyl) porphine (H2TFPP)) and the effects of additives (phenolic antioxidant, sulfuric antioxidant and hindered amine light stabilizer) on the photodegradation of the PSPs. The temporary changes in the luminescent intensity of the PSPs illuminated by a Hg-Xe lamp were measured under atmospheric pressure and room temperature for 1800 s. The results indicate that the photodegradation of PBA-PSP progresses more rapidly than those of other PSPs tested. It is also shown that the sulfuric antioxidant and the hindered amine light stabilizer are effective to reduce the photodegradation of H2TFPP-PSP, but the phenolic antioxidant promotes the photodegradation of all PSPs tested.

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