Estimation of the penetration angle of a man-made tunnel using time of arrival measured by short-pulse cross-borehole radar

Title
Estimation of the penetration angle of a man-made tunnel using time of arrival measured by short-pulse cross-borehole radar
Authors
김상욱김세윤남상욱
Keywords
tunnel; borehole; radar
Issue Date
2010-05
Publisher
Geophysics
Citation
VOL 75, NO 3, J11-J18
Abstract
The relatively fast propagation of electromagnetic signals through empty man-made tunnels has played a key role in detecting deep underground tunnels using a short-pulse crossborehole radar system. Our cross-borehole radar system measured the pulse signatures of an obliquely penetrating tunnel using eight different borehole pairs at a test site in Korea. Compared to the arrival times of the first peaks, the arrival times of the first received signals at an appropriate amplitude level provided an increasingly clear indication of the empty tunnel as its penetration angle becamemore oblique.A quadratic relationship between the arrival time of the first received signal and the oblique angle of the empty tunnel was obtained in pure granite.
URI
http://pubs.kist.re.kr/handle/201004/37380
ISSN
0016-8033
Appears in Collections:
KIST Publication > Article
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