Accession Number:

AD0861547

Title:

Shock Propagation Instrumentation.

Descriptive Note:

Technical rept. Mar 68-Jul 69,

Corporate Author:

EG AND G INC ALBUQUERQUE NM

Personal Author(s):

Report Date:

1969-10-01

Pagination or Media Count:

30.0

Abstract:

The Shock Propagation Instrumentation System SPIS senses a shock wave propagating in a soil or rock medium caused by a surface detonation and records data on magnetic tape. An investigation of various types of sensors resulted in the selection of a transducer based upon a piezoelectric ceramic coupled to an impedance amplifier. The transducer package was designed as a one-shot capable of sensing pressure changes of less than 10 psi at a rate less than 10 Hz. Signal conditioning was designed to excite the transducer, while multiplexing up to eight transducers, and provide a timing mark input. Signal conditioning was also designed as a one-shot unit to eliminate possible effects of cable noise within the explosive test cavity. The Shock Propagation Instrumentation System is designed to be used where a shock wave is traveling at rates up to 25,000 fps Pressure changes as little as 10 psi with frequencies less than 10 Hz may be detected and arrival times recorded. The trigger threshold of all sensors is matched within 10 percent. SPIS sensors are designed to be used at depths to 150 feet in a 100 percent humidity environment. The recording system consists of two rack mounted signal conditioning chassis, each with space for 6 channels. Each channel has input connectors for 8 sensors. Total sensor capability of the SPIS is 96. The entire system - tape machine, signal conditioners, power supplies, and control chassis - is to be rack mounted in an instrumentation trailer. Author

Subject Categories:

  • Seismology
  • Test Facilities, Equipment and Methods
  • Explosions

Distribution Statement:

APPROVED FOR PUBLIC RELEASE