Method and apparatus for detecting and discriminating objects under the ground
US5672825A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 1995 |
| Grant date | Sep 30, 1997 |
| Priority date | — |
| Expiry date | Oct 4, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/014
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An elastic wave is applied to an object under the ground, so that an elastic wave which varies in accordance with the material and shape of the object under the ground is detected and the detected elastic wave is collated with characteristic data such as elastic wave data, or the like, of various objects registered in advance to thereby identify/discriminate the object under the ground. A vibration generating probe and a vibration receiving probe, or, alternatively, a vibration generating and receiving probe is put into the ground so as to come in contact with an object under the ground. Then, the vibration generating probe or vibration generating and receiving probe is hammered to generate an elastic wave. At least one of one longitudinal wave and two transverse waves of the elastic wave which has propagated to the object under the ground is received by the vibration receiving probe or vibration generating and receiving probe. The vibrations of the elastic wave are converted into an electrical signal by a vibration sensor, and frequency response characteristic (and/or time-response characteristic) of the elastic wave is detected by a signal processing portion or by a signal proces…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.