Abstract: Projektet syftar till att vidareutveckla tekniken med mätning med hjälp av tryckkänslig färg ytterligare så att man också kan mäta snabbt varierande tryck. I första hand kommer sökanden att använda denna teknik inom forskningen som bedrivs vid centret CICERO där de arbetar med gasväxlingen hos förbränningsmotorer och där kunskap om strömningen i det externa systemet spelar en betydande roll för att förbättra motorns effektivitet. Både för konventionella oljebaserade bränslen och speciellt för biobränslen gäller det att kunna förbättra effektiviteten. Med denna kunskap kommer sökanden att kunna optimera hur kompresssorn ska utformas både som komponent och som en del av det komplicerade luftförsörjningssystemet i förbränningsmotorn.Abstract: In fluid mechanics the knowledge of the pressure field on the surface of the body is of major importance, e.g. it gives the lift on an airplane wing, the effectiveness of a turbine blade, the risk of boundary layer separation on vehicles etc. A method that has been in use in a few universities and research institutes make use of a special ”paint” which is distributed on the surface. The paint contains a luminophore which is excited by light of a certain wavelength and then emits light at a larger wavelength. The amount of light emitted depends on the concentration of oxygen in the paint layer, which is directly coupled to the pressure in the air above. The diffusion of oxygen into the paint layer is a relatively slow process so in order to make measurements of fluctuating pressures possible it is necessary to deposit the luminophore either directly on the surface or through a binder, which is porous in itself. In this proposal we suggest a three-year program to develop a technique and methodology to develop and test fast responding pressure sensitive paints. This method is in its infancy although there are a few demonstrated results of such methods. The method will be used by us to investigate various phenomena in rotating machinery, especially compressors used for charging of internal combustion engines. In general it is hard to measure pressure on rotating components with standard pressure taps and therefore such cases are ideal for the use of pressure sensitive paint.