PRESSURE TRANSDUCER FOR MEASURING SHOCK WAVE PROFILES.
Abstract
The development is reported of a piezoresistive gage capable of recording multikilobar shock pressure profiles in soils and rocks. Specifi cally, a gage or system of gages is required which will respond to pressures from 10 kb upward, with a rise time of the order of 0.01 micro sec and a recording duration as long as possible, 50 micro sec or greater is desired. Initial effort con sisted of two concurrent phases, an investigation of piezoresistive and insulating materials, and a gage development program. As these phases progressed, it became of primary importance to obtain suitable insulating media. The principal effort has been the selection of insulators, determination of their electrical and Hugoniot characteristics, and subsequent utilization in the design and construction of gages. Possible fundamental investigations of the piezoresistive effect in conductors has been subordinated in preference to achieving an insulator-piezoresis tive wire configuration of characteristics as clearly defined as shock wave theory and ex perimentation permit. Accordingly, a system can be provided for both future piezoresistive studies and gage development work. Particular attention has been given to peripheral, but necessary, gage systems tests, such as wire hysteresis effects, extraneous insulator pressure-induced signals (polarization, conductivity changes), electrical lead geometry and materials, and shock heating. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1963
- Accession Number
- AD0426910
Entities
People
- D.d. Ke
Organizations
- SRI International