Development of Biological Research Apparatus for Use in Acceleration and Deceleration Studies. Phase I. The Evaluation of Pressure Transducer Systems.

摘要

Response measurements were made of various pressure transducers, transducer fittings, and coupling systems using pressure-step function, sine- wave pressure, and absolute calibration techniques. The accurate standard methods of transducer-system evaluation demonstrated that these systems may be treated as lumped systems. A capacitance-type transducer with a long polyvinyl catheter was used as the test system for consideration of a transducer system with more than 1 degree of freedom. Measurement of physical constants of this system were carried out and the electrical-transmission-line theory was applied to the catheter. Theoretical consideration was given to the effect of varying physical constants upon the response of the system. A damping segment, based on the theoretical concepts, improved the amplitude vs frequency response of the system and reduced acceleration artifacts.