Accession Number : AD0624085

Title :   A PIEZORESISTIVE SHOCK-PRESSURE TRANSDUCER,

Corporate Author : HARRY DIAMOND LABS WASHINGTON D C

Personal Author(s) : Brody,P. S. ; Raiche,A. P.

Report Date : 30 AUG 1965

Pagination or Media Count : 35

Abstract : A shock-pressure spiral transducer has been fabricated and determined capable of measuring 30 kilobars or less shock pressure to =6 percent. A spiral of manganin is imbedded in a Plexiglas or epoxy matrix that is oriented so that the plane of the spiral is parallel to that of a shock front, which is generated in the matrix by gas-gun accelerated metal plates. When the spiral carries a constant current, a voltage change proportional to the time-dependent pressure occurs as a result of the resistance change caused by the piezoresistive nature of manganin. The voltage outputs produced in tests utilizing 30-kilo-bar pressure steps verify the calculated response time of approximately 10 to the minus 7th power sec and yield an effective piezoresistive coefficient for shock pressures in Plexiglas of 2.85 = 0.00017 ohms/ohm kilobar. The deviation is a measure of the spread from transducer to transducer. This report describes the imbedding procedure, circuits for measuring the resistance change, the calculated theoretical response of the transducer, the method used to produce the shock waves, and the experimental results obtained in shock-wave measurements. (Author)

Descriptors :   (*PRESSURE GAGES, SHOCK WAVES), (*PIEZOELECTRIC TRANSDUCERS, PRESSURE GAGES), (*SHOCK WAVES, MEASUREMENT), PRESSURE, COPPER, MANGANESE ALLOYS, NICKEL ALLOYS, EMBEDDING, GLASS TEXTILES, EPOXY RESINS, ELECTRICAL RESISTANCE

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE