Air-gun fire time sensor

Details Air-gun fire time sensor Air-gun fire time sensor

1978-07-10

1981-10-27

Birmiel, Howard A.

Acoustics

Geophysical or subsurface exploration

Programmed or timer-controlled

181111, 181120, 367144, G01V 1137, G01V 138

Patent

active

042968275

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.

REFERENCES:
patent: 3687218 (1972-09-01), Ritter
patent: 3985199 (1976-10-01), Baird
patent: 4047591 (1977-09-01), Ward et al.
patent: 4106585 (1978-08-01), Huizer
patent: 4141431 (1979-02-01), Baird

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