![]() Illumination variations can be caused by non-stable output from LEDs and by vibrations of the model or camera relative to one another. Model construction and tunnel operation are key considerations for effective low-speed PSP measurements. Temperature errors can be minimized by using temperature controlled tunnels and constructing the model from materials with high thermal conductivity like aluminum or stainless steel. This condition is most apparent during tunnel startup. The model is exposed to a heat flux due to changes in tunnel Mach number. The thermal signature of the internal structure is apparent when the surface of the model is subjected to a heat flux.
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