Acceleration-responsive apparatus for sensing firing instant of

Details Acceleration-responsive apparatus for sensing firing instant of Acceleration-responsive apparatus for sensing firing instant of

1979-11-02

1981-11-24

Birmiel, Howard A.

Acoustics

Geophysical or subsurface exploration

Programmed or timer-controlled

181120, 73652, 367185, 310 15, 310 30, G01V 126

Patent

active

043018874

ABSTRACT:
A variable reluctance type firing sensor is mounted on an air gun for providing an electrical signal indicative of the instant of firing of the air gun. The firing sensor has a magnetic circuit which includes a permanent magnet, a pair of pole pieces and an armature including magnetically permeable material and which is free of mechanical restraint in its normal operating position, being held by magnetic attraction in position in the magnetic circuit. The armature freely "floats" on its "magnetic springs" within a thin walled chamber in which it is housed between the pole pieces, assuming a predetermined position of least magnetic reluctance. The armature which is acceleration-responsive is suddenly displaced from its predetermined position upon the firing of the air gun, and thus the reluctance of the magnetic circuit abruptly increases at the instant of firing. The armature is surrounded by a coil which produces a signal on the movement of the armature in the magnetic circuit in response to the firing of the air gun.

REFERENCES:
patent: 3065366 (1962-11-01), Speiser et al.
patent: 3129347 (1964-04-01), Tognola
patent: 3736448 (1973-05-01), Hebel, Jr. et al.
patent: 4023056 (1977-05-01), Yamada et al.

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