고효율 심부 전기탐사를 위한 분산계측 시스템 개발 및 현장시험
Development and Field Test of a Distributed Acquisition System for High Efficiency Deep DC Resistivity Surveys
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초록
최근 심부 광물자원 및 지진, 화산과 같은 심부 지각 활동에 대한 정보를 얻기 위한 심부 전기탐사의 적용성이검토되고 있다. 이에 이 연구에서는 고효율 심부 전기탐사를 실현하기 위한 분산계측 시스템을 개발하고 검증하였다. 최신 전기전자 기술을 도입하여 개발된 이 시스템은 다음과 같은 특징을 갖는다: 1) 대전력 송신과 수신기에서의 고정밀 계측이 가능하다; 2) 펌웨어 프로그래밍을 통한 시스템 동작의 허용범위가 높아 기능 개선 및 추가가 용이하여 전기탐사 이외의 다양한 정밀 계측 응용에 적용이 가능하다; 3) 작고 가벼운 외형 및 저전력, 모듈화 설계로 현장 운용 시우수한 효율성과 유지보수성을 확보하였다. 개발 시스템의 검증을 위해 우선 전라북도 부안군 일대에서 480 m 측선을 설치 후 일선현장에서 보편화되어 운용되고 있는 상용 중앙집중형 전기탐사 시스템과 동일 조건에서의 비교실험을 하였고, 이 후 심부 전기탐사의 적용가능성을 확인하기 위해 험준한 태백산 지역의 4 km 측선에서 탐사를 하여 효율적인 탐사가 가능함을 확인하였다.
Abstract
Recently, the necessity of a DC resistivity survey for deeper parts has increased for the purpose of locating mineral resources and investigating earthquakes and volcanic activities. Accordingly, we developed and verified a distributed acquisition system to implement efficient deep DC resistivity surveys. The main features of our system adopting state of the art of electric and electronic technologies are described as follows: 1) high-power transmission and high-precision measurement is possible; 2) broad functional implementation by firmware programming guarantees the scalability and applicability for various geophysical high-precision measurements; and 3) it has high efficiency and maintainability in field operations due to its small size, light weight, modular design, and low power consumption. The system was verified through comparison with a commercial system under the same conditions along the 480-m survey line. After the verification, a large-scale survey was successfully carried out along the 4-km survey line at Mt. Taebaek.
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