Air-gun fire time sensor
US4296827A · kind A · utility
4Cited by
5References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1978 |
| Grant date | Oct 27, 1981 |
| Priority date | — |
| Expiry date | Jul 10, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The resistive sensor consists of a pair of electrodes separated by an impervious insulating material. The sensor is mounted adjacent to an exhaust port of an airgun, in the path of the air blast that results when the gun is fired. When the air gun is submerged and not activated, the surrounding water creates a low-resistance path between the electrodes. When the gun is fired, the air blast blows the water away from the electrodes and the resistance between them abruptly increases substantially. A bridge circuit detects the instant of resistance change and generates an electrical transient to mark the time that the gun fired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.