Detecting Foreign Particles in Wind Tunnels
Simple scratch test tells whether particles, which distort results, present in test. Detector developed for tests of abrasion resistance of flexible insulation blankets. Now, when detector indicates particles present in test, results interpreted accordingly. Small pits and scratches on metal foil indicate particles struck surface during wind-tunnel test. Detector used in tests of paints and coatings to determine whether abrasive particles present.
Sharp, H. L.↗