Multi-purpose Geophysical Measurements System Using PXI

PXI를 이용한 다목적 물리탐사 측정 시스템

  • Choi Seong-Jun (Engineering Geophysics Group, Korea Institute of Geoscience & Mineral Resources) ;
  • Kim Jung-Ho (Engineering Geophysics Group, Korea Institute of Geoscience & Mineral Resources) ;
  • Sung Nak-Hun (Engineering Geophysics Group, Korea Institute of Geoscience & Mineral Resources) ;
  • Jeong Ji-Min (Engineering Geophysics Group, Korea Institute of Geoscience & Mineral Resources)
  • 조성준 (한국지질자원연구원 지반탐사연구실) ;
  • 김정호 (한국지질자원연구원 지반탐사연구실) ;
  • 성낙훈 (한국지질자원연구원 지반탐사연구실) ;
  • 정지민 (한국지질자원연구원 지반탐사연구실)
  • Published : 2005.08.01

Abstract

In geophysical field surveys, commercial equipments often fail to resolve the subsurface target or even sometimes fail to be applied because they do not fit to the various field situations or the physical properties of the medium or target. We developed a geophysical measurement system, which can be easily adapted for the various field situations and targets. The system based on PXI with A/D converter and some stand alone equipment such as Network Analyzer was applied to borehole radar survey, borehole sonic measurement and electromagnetic noise measurement. The system for borehole radar survey consists of PXI, Network Analyzer, dipole antennas, GPIB interface is used for PXI to control Network Analyzer. The system for borehole sonic measurement consists of PXI, 24 Bit A/D converter, high voltage pulse generator, transmitting and receiving piezoelectric sensors. The electromagnetic noise measurement system consists of PXI, 24 Bit A/D converter, 2 horizontal component electric field sensors and 2 horizontal and 1 vertical component magnetic filed sensors. The borehole radar system has been successfully applied to detect the width of the artificial tunnel through which the borehole pass and to image buried steel pipe, while the commercial borehole radar equipment failed. The borehole sonic system was tested to detect the width of artificial tunnel and showed a reasonable result. The characteristic of electromagnetic noise was grasped at an urban area with the data from the electromagnetic noise measurement system. The system is also applied to characterize the signal distortion by induction between the electric cables in resistivity survey. The system can be applied various geophysical problems with a simple modification of the system and sensors.