公开(公告)号：US20230135564A1

公开(公告)日：2023-05-04

申请号：US17974678

申请日：2022-10-27

Applicant: JEOL Ltd.

Inventor： Kenichi Hachitani ,  Nobuaki Nemoto ,  Junpei Hamatsu ,  Fumihiro Yamazaki ,  Takayuki Suzuki

IPC: G01R33/46

Abstract: In a frequency converter, a transmission signal having a first frequency component and a second frequency component is multiplied by a local signal, to thereby frequency-convert the transmission signal. In a power amplifier, the frequency-converted transmission signal is amplified. A demultiplexing circuit generates a first transmission signal and a second transmission signal from the amplified transmission signal. A controller is configured to set for a transmission section a frequency set suitable for two irradiation frequencies.

公开(公告)号：US10302721B2

公开(公告)日：2019-05-28

申请号：US14805796

申请日：2015-07-22

Applicant: JEOL Ltd.

Inventor： Kenichi Hachitani ,  Kenya Izumi ,  Yukio Nishimura ,  Takayuki Suzuki

IPC: G01R33/46 ,  G01R33/36 ,  G01R33/54

Abstract: Procedure instruction sequences (P1˜PN) in an instruction sequence (for example, an instruction sequence for an NMR spectrometer) are generated in a precedential manner, and transferred to a procedure storage area on a transmission and reception unit in a precedential manner. After the precedential transfer, a remaining portion of the instruction sequence (streaming instruction sequence (SM1, . . . )) is sequentially generated in predetermined units from the beginning, and sequentially transferred to a FIFO area on the transmission and reception unit. A sequencer refers to the streaming instruction sequence, executes the instruction, and refers to a procedure instruction sequence on the procedure storage area.

公开(公告)号：US10338168B2

公开(公告)日：2019-07-02

申请号：US14805706

申请日：2015-07-22

Applicant: JEOL Ltd.

Inventor： Kenichi Hachitani

IPC: G01R33/36 ,  G01R33/54

Abstract: In a magnetic resonance measurement apparatus, when a frequency of an observation nucleus falls within a high frequency band, a frequency conversion scheme is selected. In this case, an intermediate frequency signal is generated as an original signal, which is then frequency-converted to generate an RF transmission signal. An RF reception signal is converted into an intermediate frequency signal by frequency conversion, and is sampled. When the frequency of the observation nucleus falls within a low frequency band, a non-conversion scheme is selected. In this case, an RF transmission signal is generated as the original signal, and an RF reception signal is sampled.

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：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.