公开(公告)号：US20190331747A1

公开(公告)日：2019-10-31

申请号：US16392949

申请日：2019-04-24

Applicant: JEOL Ltd.

Inventor： Katsuyuki Toshima ,  Shigenori Tsuji ,  Shinji Nakamura ,  Fumio Hobo ,  Takeshi Tsukada ,  Akifumi Nomura

IPC: G01R33/385 ,  G01R33/421 ,  G01R1/067

Abstract: A sample pipe is provided in a sample temperature control pipe. A detection coil is provided in a low-temperature airtight chamber and configured to irradiate a sample with a high-frequency magnetic field. A room-temperature shield is provided on an outer circumferential surface of the sample temperature control pipe or on an inner circumferential surface thereof, and is configured to block irradiation of the high-frequency magnetic field from the detection coil from reaching a region other than an observation object. A low-temperature shield is provided in an airtight chamber and between the detection coil and the room-temperature shield and is configured to block irradiation of the high-frequency magnetic field from the detection coil from reaching the room-temperature shield.

公开(公告)号：US10132896B2

公开(公告)日：2018-11-20

申请号：US14805680

申请日：2015-07-22

Applicant: JEOL Ltd.

Inventor： Kenichi Hachitani ,  Kenya Izumi ,  Takeshi Tsukada

IPC: G01R33/54 ,  G01R33/36

Abstract: In a magnetic resonance measurement apparatus, a plurality of transmission signals are combined to generate a digital combined signal. The digital combined signal is converted into an analog combined signal by a D/A converter. The signal includes, for example, a first pulse of a rectangular shape and a second pulse of a mountain shape. During measurement, an operation of a dynamic variable attenuator is changed immediately after the first pulse. With this process, the second pulse is suppressed, and a suppressed second pulse is generated.

公开(公告)号：US10295632B2

公开(公告)日：2019-05-21

申请号：US14805731

申请日：2015-07-22

Applicant: JEOL Ltd.

Inventor： Kenichi Hachitani ,  Takeshi Tsukada ,  Tetsuro Sugita ,  Takayuki Suzuki

IPC: G01R33/46 ,  G01R33/36

Abstract: In a magnetic resonance measurement apparatus such as an NMR measurement apparatus, when a frequency of an observation nucleus falls within a high frequency band, an RF reception signal is converted into an intermediate frequency signal, and is input to an analog-to-digital converter. In this case, under-sampling is executed for the intermediate frequency signal in the analog-to-digital converter, and a second-order aliased signal component generated from a target signal component is observed. On the other hand, when the frequency of the observation nucleus falls within a low frequency band, over-sampling for the RF reception signal is executed.

公开(公告)号：US10775456B2

公开(公告)日：2020-09-15

申请号：US16392949

申请日：2019-04-24

Applicant: JEOL Ltd.

Inventor： Katsuyuki Toshima ,  Shigenori Tsuji ,  Shinji Nakamura ,  Fumio Hobo ,  Takeshi Tsukada ,  Akifumi Nomura

IPC: G01R33/385 ,  G01R1/067 ,  G01R33/421

Abstract: A sample pipe is provided in a sample temperature control pipe. A detection coil is provided in a low-temperature airtight chamber and configured to irradiate a sample with a high-frequency magnetic field. A room-temperature shield is provided on an outer circumferential surface of the sample temperature control pipe or on an inner circumferential surface thereof, and is configured to block irradiation of the high-frequency magnetic field from the detection coil from reaching a region other than an observation object. A low-temperature shield is provided in an airtight chamber and between the detection coil and the room-temperature shield and is configured to block irradiation of the high-frequency magnetic field from the detection coil from reaching the room-temperature shield.