公开(公告)号：FR2365123A1

公开(公告)日：1978-04-14

申请号：FR7722465

申请日：1977-07-13

Applicant: IBM

Inventor： DOUBLE GLEN P ,  KAHWATY VINCENT N ,  RANDALL JAMES D ,  REINHART FRITZ M

IPC: G01R33/387 ,  G01R33/383 ,  G01N27/78 ,  H01J39/34

公开(公告)号：CA1089006A

公开(公告)日：1980-11-04

申请号：CA287051

申请日：1977-09-20

Applicant: IBM

Inventor： DOUBLE GLEN P ,  KAHWATY VINCENT N ,  RANDALL JAMES D ,  REINHART FRITZ M

IPC: G01R33/387 ,  G01R33/383 ,  H01F7/00

Abstract: NMR MAGNET ASSEMBLY WITH POLE FACE PARALLELISM ADJUSTMENT A nuclear magnetic resonance (NMR) magnet assembly includes two pole faces spaced to provide a gap in which is established a uniform magnetic field. The pole pieces have pole faces that are flat and parallel. The pole pieces are mounted on support plates one of which is fixed and the other of which is movable about a pivot point with two degrees of freedom of movement in response to adjustment of two adjustable mechanisms. Each adjustment mechanism includes a differential screw that produces a transverse movement and a longitudinally inclined pin or pins that translates such transverse movement into a much greatly reduced longitudinal movement. The combination of a differential screw and inclined pin provides a very fine adjustment of the parallelism of the pole faces. Each mechanism further includes means for providing a coarse adjustment.

公开(公告)号：FR2376413A1

公开(公告)日：1978-07-28

申请号：FR7735650

申请日：1977-11-18

Applicant: IBM

Inventor： HOFER DONALD C ,  KAHWATY VINCENT N ,  VALENTINO CARL R

IPC: G01N24/08 ,  G01R33/46 ,  G01N27/78

Abstract: A method is described for the quantitative analysis of a solution in which the solvent produces a nuclear magnetic resonant (NMR) spectral peak that dominates the system. A first spectrum containing the peak is made by operation of a nuclear magnetic resonant spectrometer at a first gain setting. The NMR apparatus is a pulse-modulated, Fourier-transform type spectrometer. A second spectrum is produced in which a 180 DEG pulse is applied to invert the spectral component magnetization followed after a period of time by a 90 DEG pulse. The period of time is sufficient to allow the solvent or component producing the unwanted peak to relax from the inverted state to a point where there is minimum magnetization along the longitudinal axis. At this point, in many solutions the other components have completely relaxed so that the 90 DEG pulse produces a free induction decay signal which, after undergoing the Fourier-transformation, yields a spectrum that does not include any significant peak due to the solvent. Thereafter, the quantitative analysis is performed by measuring the areas under the respective component peaks and simultaneously solving a series of equations in which the weight of the various components is proportional to the respective areas under the peaks and to the gain settings of the spectrometer.

公开(公告)号：CA2064641A1

公开(公告)日：1992-11-03

申请号：CA2064641

申请日：1992-04-01

Applicant: IBM

Inventor： ABOAF JOSEPH A ,  DENISON EDWARD V ,  KAHWATY VINCENT N ,  STEVING GERALD

IPC: G11B5/31 ,  G11B5/39 ,  G11B5/127

Abstract: An interleaved bi-directional magnetic tape head for contact recording has a stripe poletip 30 in the form of a thin film of a soft magnetic material deposited onto a magnetic ferrite substrate 22. A second thin film polepiece 40 is deposited over a gap region 26. A closure block 24 of a non-magnetic ceramic encloses the layers together with leveling insulation layers 32, 34 and deposited activating conductor turns 36. The stripe poletip extends for a distance just short of the first conductor turn and provides a balancing of the saturation moment of the pole pieces and provides for better recording capability, especially when operating in a trailing magnetic ferrite mode.

公开(公告)号：CA2054579A1

公开(公告)日：1992-06-27

申请号：CA2054579

申请日：1991-10-31

Applicant: IBM

Inventor： DENISON EDWARD V ,  KAHWATY VINCENT N ,  STERN GUSTAVE C ,  STEVING GERALD ,  ZAMMIT ROBERT P

IPC: G11B5/265 ,  G11B5/245 ,  G11B5/29 ,  G11B5/31 ,  G11B5/39 ,  G11B5/48

Abstract: In a magnetic recording system tape is transported bi-directionally across the interleaved head. The interleaved head includes two modules, each module having a plurality of alternate read and write transducer gaps spaced apart along a single gap line transverse to the movement of the magnetic tape. The two modules are placed together so that the write gaps of one module are aligned with the read gaps of the other module. Each module is formed on a nickel-zinc ferrite substrate by deposition of magneto-resistive material to form read transducer elements 69 and deposition of conductor material to form read conductors 74, 76 and 78 and write coils 80. A nickel zinc ferrite closure piece is secured to the substrate to complete the module. In order to provide leveling across the write and read transducers of the module, write back gap islands 90, 92 are provided in the back gap regions 68 of the write coils made of the same material with the same thickness as the magneto resistive element and the conductors interconnecting the magneto resistive element to the read/write network of the tape drive.

公开(公告)号：CA1089014A

公开(公告)日：1980-11-04

申请号：CA292763

申请日：1977-12-09

Applicant: IBM

Inventor： HOFER DONALD C ,  KAHWATY VINCENT N ,  VALENTINO CARL R

IPC: G05F7/00 ,  G01R33/389 ,  G01R33/46 ,  G01R33/08

Abstract: NMR FIELD FREQUENCY LOCK SYSTEM An NMR (nuclear magnetic resonance) spectrometer has a permanent magnet provided with a field coil. A lock system cyclically pulses a deuterium lock sample to produce a FID (free induction decay) signal that is analyzed by measuring the time interval during which the FID signal crosses the zero axis a predetermined number of times. The measured interval is compared to a predetermined interval or set point, and the current through the field coil is adjusted in the direction tending to correct the field strength so as to maintain the measured interval equal to the preset interval. Such measurement, comparison and adjustment are done several times each second. When the sample is removed, the lock system retains the last field setting achieved with the sample.

公开(公告)号：CA1064578A

公开(公告)日：1979-10-16

申请号：CA291864

申请日：1977-11-28

Applicant: IBM

Inventor： HOFER DONALD C ,  KAHWATY VINCENT N ,  VALENTINO CARL R

IPC: G01N24/08 ,  G01R33/46 ,  G01R33/08

Abstract: QUANTITATIVE ANALYSIS OF NUCLEAR MAGNETIC RESONANCE SPECTRA HAVING SOLVENT PEAKS A method is described for the quantitative analysis of a solution in which the solvent produces a nuclear magnetic resonant (NMR) spectral peak that dominates the system. A first spectrum containing the peak is made by operation of a nuclear magnetic resonant spectrometer at a first gain setting. The NMR apparatus is a pulse-modulated, Fourier-transform type spectrometer. A second spectrum is produced in which a 180.degree. pulse is applied to invert the spectral component magnetization followed after a period of time by a 90.degree. pulse. The period of time is sufficient to allow the solvent or component producing the unwanted peak to relax from the inverted state to a point where there is minimum magnetization along the longitudinal axis. At this point, in many solutions the other components have completely relaxed so that the 90.degree. pulse produces a free induction decay signal which, after undergoing the Fourier-transformation, yields a spectrum that does not include any significant peak due to the solvent. Thereafter, the quantitative analysis is performed by measuring the areas under the respective component peaks and simultaneously solving a series of equations in which the weight of the various components is proportional to the respective areas under the peaks and to gain settings of the spectrometer.

公开(公告)号：FR2381308A1

公开(公告)日：1978-09-15

申请号：FR7801569

申请日：1978-01-16

Applicant: IBM

Inventor： HOFER DONALD C ,  KAHWATY VINCENT N ,  VALENTINO CARL R

IPC: G05F7/00 ,  G01R33/389 ,  G01R33/46 ,  G01N27/78

Abstract: An NMR (nuclear magnetic resonance) spectrometer has a permanent magnet provided with a field coil. A lock system cyclically pulses a deuterium lock sample to produce a FID (free induction decay) signal that is analyzed by measuring the time interval during which the FID signal crosses the zero axis a predetermined number of times. The measured interval is compared to a predetermined interval or set point, and the current through the field coil is adjusted in the direction tending to correct the field strength so as to maintain the measured interval equal to the preset interval. Such measurement, comparison and adjustment are done several times each second. When the sample is removed, the lock system retains the last field setting achieved with the sample.