Underwater detector streamer apparatus for improving the fidelity of recorded seismic signals

Claim 1

A WATERBORNE SEISMIC PROSPECTING SYSTEM FOR SUBAQUEOUS GEOLOGICAL STRUCTURES COMPRISING, IN COMBINATION, (1) AN OIL FILLED FLEXIBLE ELONGATED NEUTRALLY BUOYANT STREAMER ADAPTED TO BE TOWED AT VARIOUS DEPTHS OF SUBMERSION BENEATH THE SURFACE OF A BODY OF WATER, (2) A PLURALITY OF PRESSURE RESPONSIVE DETECTORS DISPOSED AT INTERVALS WITHIN THE STREAMER THROUGHOUT THE LENGTH THEREOF FOR PRODUCING AN OUTPUT ELECTRICAL SIGNAL CORRELATIVE WITH THE CHARACTER OF A SEISMIC WAVE REFLECTED FROM SUBBOTTOM STRATA BENEATH THE STREAMER, (3) MEANS WITHIN THE STREAMER FOR ERASING THE ELECTRICAL SIGNAL GENERATED BY THE PRESSURE RESPONSIVE DETECTORS AND CAUSED BY A SECOND SEISMIC WAVE REFLECTED DOWNWARDLY FROM THE SURFACE OF THE WATER AND IMPINGING ON THE STREAMER AT EACH OF SAID DEPTHS OF SUBMERSION, SAID ERASING MEANS COMPRISING, (A) A PLURALITY OF VERTICALLY MOUNTED PARTICLE VELOCITY DETECTORS EACH HAVING MEANS INCLUDING AN ANNULAR MAGNET RESILIENTLY MOUNTED WITHIN AND SUPPORTED BY A LIKE NUMBER OF GIMBAL SUPPORTED SLEEVES AND FORMING A CIRCULAR MAGNETIC AIR GAP, (B) A MOVABLE ANNULAR WIRE COIL, (C) MEANS FOR MEANS IN A MANNER TO ALLOW A RESAID MAGNET MEANS IN A MANNER TO ALLOW A RECIPPROCAL MOVEMENT OF THE COIL WITHIN SAID AIR GAP, AND (D) A DOME SHAPED DIAPHRAGM SECURED TO SAID COIL SUPPORTING MEANS FOR CAUSING RECIPROCAL MOVEMENT THEREOF IN RESPONSE TO THE INSTANTA-