Polarimetric borehole radar measurement at the Mirror Lake test site

Motoyuki Sato; Moriyasu Takeshita; Takashi Miwa; John W. Lane Jr.

doi:10.1117/12.365689

15 October 1999 Polarimetric borehole radar measurement at the Mirror Lake test site

Motoyuki Sato, Moriyasu Takeshita, Takashi Miwa, John W. Lane Jr.

Proceedings Volume 3752, Subsurface Sensors and Applications; (1999) https://doi.org/10.1117/12.365689
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

In order to understand the potential of polarimetric borehole radar, field measurement was carried out at the Mirror Lake fractured-rock research site (NH, USA), in October 1998. The polarimetric borehole radar system can measure the full- polarimetry in a borehole by changing antenna arrangements. We developed a network analyzer based stepped-frequency radar. The radar penetration depth from the borehole in the reflection measurement was over 10 m, in the frequency range of 2 - 200 MHz. We could observe many clear reflections form fractures in each polarization state. Even in the raw data, we could observe the difference in the radar profile for different polarization states. Polarimetric future for the acquired data is analyzed and it was found that the depolarization effect is different in each fracture. We think this is closely related to the roughness of each fracture, and it is also related to physical properties of the fracture such as water permeability. Cluster analysis was tested for classification of fractures.

Citation Download Citation

Motoyuki Sato, Moriyasu Takeshita, Takashi Miwa, and John W. Lane Jr. "Polarimetric borehole radar measurement at the Mirror Lake test site", Proc. SPIE 3752, Subsurface Sensors and Applications, (15 October 1999); https://doi.org/10.1117/12.365689

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