목재의 수종과 함수율 그리고 탐지 깊이와 방향에 따른 지중 흰개미 탐지 장치로서 Termatrac T3i의 탐지 성능 변화 특성
Changes in the Detection Performance of Termatrac T3i as a Reticulitermes Speratus Detection Device According to the Wood(Species and Moisture Content) and Detection(Depth and Direction) Condition
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초록
본 연구에서는 목재 내부의 지중 흰개미(Reticulitermes speratus) 탐지에 사용되고 있는 극초단파 장치에 대한 검출 성능 및 적용 가능성을 확인하였다. 목재의 비중과 함수율이 높을 수록 Termatrac T3i에서 방출된 2.4 GHz 극초단파의 신호강도는 낮게 나타났다. 또한 목재의 두께가 두꺼워질수록 극초단파의 신호 강도가 감소하여, 두께 60 mm 목재에서의 신호 강도는 20 mm 조건 대비 절반 이하가 되었다. 또한 극초단파의 강한 직진성 때문에 측정 지점으로부터 반경 50 mm 초과 시 극초단파의 신호강도가 급격하게 감소하였다. 이는 소나무 목부재 내부의 흰개미 활성을 판단하기 위해서 Termatrac T3i의 측정 간격을 100 mm 이내로 설정해야 함을 시사한다. 한편, 국내에서 목조건축물에 사용된 소나무 기둥의 평균 변재폭은 60-70 mm 내외이 며, 흰개미는 목부재의 변재부를 우선적으로 가해하는 것으로 밝혀졌다. 따라서 이러한 흰개미 의 가해 특성과 Termatrac T3i의 탐지 성능을 적절하게 활용함으로써 목조건축물의 목부재를 가해 중인 흰개미의 현장 탐지가 가능할 것이다.
Abstract
This study confirmed the detection performance and applicability of microwave devices used to detect subterranean termites inside the wood. The detection performance of Termatrac T3i decreased as the specific gravity and moisture content increased due to the anisotropy and wave absorption characteristics of wood. Additionally, Termatrac T3i was able to detect termites within a radius of 50 mm and a maximum depth of 50 mm based on the measurement point due to the strong straightness of the 2.4 GHz microwave. These results suggest that the measurement interval and depth of Termatrac T3i should be set within 100 mm and 50 mm to determine the termite activity inside the pine wood member. Additionally, the applicability according to the detection performance of Termatrac T3i was investigated. The results confirmed the damage pattern in which Reticulitermes speratus preferentially attacked the sapwood of the wood member, and that the average sapwood width of the pine tree used as the wood member of the wooden structure was approximately 60-70 mm. Therefore, Termatrac T3i, which has been confirmed to be able to measure termite activity up to 50 mm deep in a straight line for pine trees, is considered to be applicable to the detection of activity of R. speratus, which prefers sapwood.
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