FABRICATION AND TESTING ACOUSTIC SENSORS FOR BOUNDARY LAYER FLOW TRANSITION DETECTION

摘要

The fabrication and test of seven acoustic transition detector systems has been accomplished for use in the Pacemaker Materials Technology Experiment. These systems are designed to measure the Location and level of the turbulent pressure that occurs during and following the transition from laminar to turbulent flow in re-entrynTo measure these factors, a snail rugged pressure transducer is ported to the boundary layer. This transducer must have thermal protection and low sensitivity to vehicle vibrations yet must achieve a broad bandwidth acoustic measurement. Appropriate signal conditioning equipment then fermions the transducer. The techniques used to achieve these goals were aevelcpea and tested supersonically by BBN under sub-contract NAS 1-7439.