Migrator for geophysical exploration

Claim 1

AN APPARATUS FOR PREPARING A MIGRATED SEISMIC SECTION FROM AN UNMIGRATED VARIABLE DENSITY PHOTOGRAPHIC NEGATIVE-TYPE SEISMIC SECTION WHICH COMPRISES IN COMBINATION SUPPORT MEANS HAVING A LONGITUDINAL DIMENSION AND ADAPTED TO SUPPORT THE UNMIGRATED SEISMIC SECTION WITH THE TRACES IN LONGITUDINAL ALIGNMENT WITH SAID SUPPORT MEANS; SCANNING MEANS ARRANGED TO MOVE LONGITUDINALLY WITH RESPECT TO SAID SECTION, SAID SCANNING MEANS INCLUDING A ROTATABLE RADIALLY SLOTTED DISC SPACED FROM AND ESSENTIALLY PARALLEL TO SAID UNMIGRATED SECTION, A LIGHT SOURCE POSITIONED ON THE OPPOSITE SIDE OF SAID SECTION FROM SAID SCANNING MEANS, A LIGHT-SPLITTING DEVICE DISPOSED BETWEEN SAID DISC AND SAID UNMIGRATED SECTION, MEANS FOR ROTATING SAID DISC ABOUT A FIXED AXIS, A PHOTOELECTRIC CELL ARRANGED TO RECEIVE LIGHT WAVES FROM SAID LIGHT-SPLITTING DEVICE WHICH PASS THROUGH SAID SLOT IN SAID DISC AND ADAPTED TO DETECT THE RELATIVE POSITION OF THE SLOT OF SAID DISC WHEN SAID SLOT IS ALIGNED WITH THE APPARENT ANGLE OF DIP OF GEOLOGIC HORIZONS AS INDICATED BY REFLECTIONS RECORDED ON SAID UNMIGRATED SEISMIC SECTION, AND A SECOND PHOTOELECTRIC CELL FOR RECEIVING LIGHT WAVES FROM SAID LIGHT-SPLITTING DEVICE; A SECOND SLOTTED DISC ADAPTED TO BE DRIVEN AT A SPEED SYNCHRONIZED WITH SAID FIRST DISC; A BAR, A PIVOT FOR SAID BAR INTERMEDIATE THE END OF SAID BAR AND ON THE SAME AXIS ON WHICH SAID SECOND DISC ROTATES, WITH SAID BAR BEING CHARACTERIZED BY HAVING A SLOT THEREIN SO POSITIONED AS TO BE CAPABLE OF ALIGNMENT WITH SAID SLOT IN SAID SECOND DISC; A SECOND LIGHT SOURCE DISPOSED ABOVE SAID SLOT IN SAID BAR; A THIRD PHOTOELECTRIC CELL POSITIONED OPPOSITE SAID SECOND LIGHT SOURCE AND ARRANGED SUCH THAT SAID BAR AND SAID SECOND DISC ARE BETWEEN SAID SECOND LIGHT SOURCE AND SAID THIRD PHOTOELECTRIC CELL; A PHASE DETECTOR ELECTRICALLY CONNECTED TO SAID FIRST PHOTOELECTRIC CELL AND SAID THIRD PHOTOELECTRIC CELL; PHASE EQUALIZING MEANS RESPONSIVE TO SAID PHASE DETECTOR AND CAPABLE OF ROTATING SAID BAR ABOUT ITS AXIS TO BRING THE OUTPUT SIGNALS OF SAID THIRD PHOTOELECTRIC CELL INTO PHASE WITH SAID FIRST PHOTOELECTRIC CELL OUTPUT; A SECOND SUPPORT MEANS HAVING A LONGITUDINAL DIMENSION AND ADAPTED TO SUPPORT A PHOTOGRAPHIC RECORDING MEDIUM; A RECORDING DEVICE CAPABLE OF REPRODUCING THE MIGRATED SECTION ON SAID MEDIUM FROM IMPULSES RECEIVED FROM SAID SECOND PHOTOELECTRIC CELL AND MOVABLE LONGITUDINALLY WITH RESPECT TO SAID MEDIUM ALONG A SUPPORT MEMBER PIVOTED AT ONE END OF SAID SECOND SUPPORT MEANS; AND LINKAGE MEANS CONNECTING SAID BAR WITH SAID SUPPORT MEMBER FOR ANGULAR ADJUSTMENT THEREOF RESPONSIVE TO SAID SCANNING MEANS SUCH THAT THE SINE OF THE ANGLE OF DIP OF GEOLOGIC HORIZONS AS INDICATED BY REFLECTIONS RECORDED ON SAID RECORDING MEDIUM IS EQUAL TO THE TANGENT OF THE ANGLE OF DIP AS INDICATED ON SAID UNMIGRATED SECTION.

Claim 2

AN APPARATUS FOR PREPARING A MIGRATED SEISMIC SECTION FROM AN UNMIGRATED VARIABLE DENSITY PHOTOGRAPHIC NEGATIVE-TYPE SEISMIC SECTION WHICH COMPRISES IN COMBINATION SUPPORT MEANS HAVING A LONGITUDINAL DIMENSION AND ADAPTED TO SUPPORT THE UNMIGRATED SEISMIC SECTION WITH THE TRACES IN LONGITUDINAL ALIGNMENT WITH SAID SUPPORT MEANS; SCANNING MEANS ARRANGED TO MOVE LONGITUDINALLY WITH RESPECT TO SAID SECTION, SAID SCANNING MEANS INCLUDING A ROTATABLE RADIALLY SLOTTED DISC SPACED FROM AND ESSENTIALLY PARALLEL TO SAID UNMIGRATED SECTION, A LIGHT SOURCE POSITIONED ON THE OPPOSITE SIDE OF SAID SECTION FROM SAID SCANNING MEANS, A LIGHT-SPLITTING DEVICE DISPOSED BETWEEN SAID DISC AND SAID UNMIGRATED SECTION, MEANS FOR ROTATING SAID DISC ABOUT A FIXED AXIS, A PHOTOELECTRIC CELL ARRANGED TO RECEIVE LIGHT WAVES FROM SAID LIGHT-SPLITTING DEVICE WHICH PASS THROUGH SAID SLOT IN SAID DISC AND ADAPTED TO DETECT THE RELATIVE POSITION OF THE SLOT OF SAID DISC WHEN SAID SLOT IS ALIGNED WITH THE APPARENT ANGLE OF DIP OF GEOLOGIC HORIZONS AS INDICATED BY REFLECTIONS RECORDED ON SAID UNMIGRATED SEISMIC SECTION, AND A SECOND PHOTOELECTRIC CELL FOR RECEIVING LIGHT WAVES FROM SAID LIGHT-SPLITTING DEVICE; A SECOND SLOTTED DISC ADAPTED TO BE DRIVEN AT A SPEED SYNCHRONIZED WITH SAID FIRST DISC; A BAR, A PIVOT FOR SAID BAR INTERMEDIATE THE END OF SAID BAR AND ON THE SAME AXIS ON WHICH SAID SECOND DISC ROTATES, WITH SAID BAR BEING CHARACTERIZED BY HAVING A SLOT THEREIN SO POSITIONED AS TO BE CAPABLE OF ALIGNMENT WITH SAID SLOT IN SAID SECOND DISC; A SECOND LIGHT SOURCE DISPOSED ABOVE SAID SLOT IN SAID BAR; A THIRD PHOTOELECTRIC CELL POSITIONED OPPOSITE SAID SECOND LIGHT SOURCE AND ARRANGED SUCH THAT SAID BAR AND SAID SECOND DISC ARE BETWEEN SAID SECOND LIGHT SOURCE AND SAID THIRD PHOTOELECTRIC CELL; A PHASE DETECTOR ELECTRICALLY CONNECTED TO SAID FIRST PHOTOELECTRIC CELL AND SAID THIRD PHOTOELECTRIC CELL; PHASE EQUALIZING MEANS RESPONSIVE TO SAID PHASE DETECTOR AND CAPABLE OF ROTATING SAID BAR ABOUT ITS AXIS TO BRING THE OUTPUT SIGNALS OF SAID THIRD PHOTOELECTRIC CELL INTO PHASE WITH SAID FIRST PHOTOELECTRIC CELL OUTPUT; A SECOND SUPPORT MEANS HAVING A LONGITUDINAL DIMENSION AND ADAPTED TO SUPPORT A PHOTOGRAPHIC RECORDING MEDIUM; A RECORDING DEVICE CAPABLE OF REPRODUCING THE MIGRATED SECTION ON SAID MEDIUM FROM IMPULSES RECEIVED FROM SAID SECOND PHOTOELECTRIC CELL AND MOVABLE LONGITUDINALLY WITH RESPECT TO SAID MEDIUM ALONG A SUPPORT MEMBER PIVOTED AT ONE END OF SAID SECOND SUPPORT MEANS; AND LINKAGE MEANS CONNECTING SAID BAR WITH SAID SUPPORT MEMBER FOR ANGULAR ADJUSTMENT THEREOF RESPONSIVE TO SAID SCANNING MEANS SUCH THAT THE SINE OF THE ANGLE OF DIP OF GEOLOGIC HORIZONS AS INDICATED BY REFLECTIONS RECORDED ON SAID RECORDING MEDIUM IS EQUAL TO THE TANGENT OF THE ANGLE OF DIP AS INDICATED ON SAID UNMIGRATED SECTION.