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ACCELERATION-COMPENSATING PRESSURE TRANSDUCERS FOR SURFACE-PRESSURE MEASUREMENTS
NAVAL ORDNANCE LAB WHITE OAK MD
DESCRIPTORS Transducers, Pressure, Materi als, Strain gages, Calibration, Measurement, Barium compounds, Titanates, Polarization, Aerodynamic configurations, Re-entry aerody namics, Shock tubes, Wind tunnels, Tests. An acceleration-compensating pressure transducer was developed for use in the U. S. Naval Ordnance Laboratory high-performance shocktube wind tunnels to operate at pitot pressures as high as 1,000 psi. The transducer consists of two polarized barium titanate elements whose outputs are closely matched. The elements are connected electrically to cancel mechanical forces simultaneously detected by both elements. Only one element is exposed to the flow. Tests in the 6-in. Shocktube, and in the Shocktube Wind Tunnels have shown that the transducer gives accurate pressure information for the aerodynamic conditions generated in these facilities. Author