Arrangement for detecting an object by means of sound conducted through a solid body and method of using such arrangement
US5265831A · kind A · utility
Inventor
Key dates
| Filing date | Sep 9, 1991 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | Sep 9, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB61L29/224
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for detecting an impact sound, such as a sound caused by a railroad vehicle approaching a construction location. The apparatus comprises an arrangement for detecting impact sound or vibrations with a receiver mounted at the rail, for example, and, further, an evaluation circuit for processing the vibrations and triggering a warning signal when the intensity of the receiver-output signal continuously increases, for example, when the intensity in a predetermined frequency range passes through predetermined threshold values during predetermined times. Thus, an approaching railroad vehicle can be positively detected by monitoring a continuously increasing sound or vibration which is propagated in the rails.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.