| タイトル | System for detecting substructure microfractures and method therefore |
| 本文（外部サイト） | http://hdl.handle.net/2060/19800002263 |
| 著者（英） | Narasimhan, K. Y.; Parthasarathy, S. P. |
| 著者所属（英） | Jet Propulsion Lab., California Inst. of Tech.|NASA Pasadena Office |
| 発行日 | 1979-09-18 |
| 言語 | eng |
| 内容記述 | Bursts of signals at different frequencies are induced into substructure, adjacent to a borehole. The return signals from each burst of signals are normalized to compensate for the attenuation, experienced by more distant return signals. The peak amplitudes of return signals, above a selected level, are cut off, and an average signal is produced from the normalized amplitude-limited return signals of each burst. The averaged signals of the return signals of all the signal bursts at the different frequencies are processed to provide a combined signal, whose amplitude is related to the microfracture density of the substructure adjacent to the borehole. |
| NASA分類 | STRUCTURAL MECHANICS |
| レポートNO | 80N10507 |
| 権利 | No Copyright |
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