TRANSDUCER TECHNIQUES FOR MEASURING THE EFFECT OF SMALL-ARMS' NOISE ON HEARING
HUMAN ENGINEERING LAB ABERDEEN PROVING GROUND MD
Pagination or Media Count:
This study investigated several types of transducers which might be considered for use when evaluating the hearing hazard of pressure waves that small arms produce. In measuring the small arms peak sound-pressure level, error was directly proportional to the measured rise time and inversely proportional to the positive pressure duration of the wave. The most accurate results were obtained by positioning the transducers vertically, with the pressure wave grazing the sensing surface at 90 degrees incidence. Moreover, there was good agreement between measurements made with a wide-band piezoelectric transducer and those made with a wide-band condenser microphone. Finally, pistonphone calibrations at low levels 127 dB compare favorably with shock wave calibrations at high levels 170 to 180 dB.
- Anatomy and Physiology