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    • 4. 发明授权
    • Amplitude modulated RF pulse generator
    • 幅度调制RF脉冲发生器
    • US5583467A
    • 1996-12-10
    • US436807
    • 1995-05-05
    • Bernard LoewenguthJean M. Tyburn
    • Bernard LoewenguthJean M. Tyburn
    • G01R33/32G01R33/36G01R33/46G01R33/54H03C1/02H03K7/02
    • G01R33/3607G01R33/4625G01R33/543
    • Device and process for the generation of amplitude-modulated radiofrequency excitation pulses. A first unit (2) delivers a radiofrequency signal of constant level and a second unit (3) delivers a modulation signal of the radiofrequency signal, formed from numerical data. At least two analog multipliers (6) are connected in cascade as to the radiofrequency signal (RF) from the first unit (2) and are supplied in parallel by the modulation signal (SM) from the second unit (3). For n multipliers (6) in cascade, with n.gtoreq.2, the modulation signal (SM) delivered to the n multipliers (6) is of the A.sup.1/n.f(t) type, A.f(t) being the desired resulting modulation signal (SMR). The second unit (3) is a memory (4) containing point by point the envelope of the modulation signal A.sup.1/n.f(t) and a digital/analog converter (5) whose output is connected to the inputs in parallel of the n analog multipliers (6) in cascade.
    • 用于产生调幅射频激发脉冲的装置和过程。 第一单元(2)传送恒定电平的射频信号,第二单元(3)传送由数字数据形成的射频信号的调制信号。 至少两个模拟乘法器(6)与来自第一单元(2)的射频信号(RF)级联连接,并且由来自第二单元(3)的调制信号(SM)并行提供。 对于级联的n个乘法器(6),在n> / = 2时,传送到n个乘法器(6)的调制信号(SM)是A1 / nf(t)类型,Af(t)是期望的所得调制 信号(SMR)。 第二单元(3)是逐点地包含调制信号A1 / nf(t)的包络和数字/模拟转换器(5)的存储器(4),其数字/模拟转换器(5)的输出与n个模拟 乘法器(6)级联。
    • 5. 发明授权
    • Commutation device and control process using the same
    • 换向装置和控制过程使用相同
    • US5442291A
    • 1995-08-15
    • US152026
    • 1993-11-15
    • Jean-Max TyburnAlfred NiessTonio Gianotti
    • Jean-Max TyburnAlfred NiessTonio Gianotti
    • G01R33/385G01R33/3875G01V3/00
    • G01R33/3852G01R33/3875
    • Commutation device to connect and disconnect a current or voltage generator and a coil adapted to create a gradient of magnetic field in a measurement chamber of an NMR apparatus. The device comprises a switch (1) mounted in the supply circuit (2) of the coil (3), actuated by a control signal and adapted, in open position, to isolate totally the coil (3) from the generator (4). The switch is a double switch (1) adapted to separate, upon opening, the supply circuit (2) into a portion (5) connected to the generator (4) and a portion (6) connected to the coil (3), independently of each other. Alternatively the switch can be a high speed switch comprising at least one field effect transistor. The process for controlling the action of the coil comprises, at the end of an excitation phase and just before a measurement phase, sending an opening signal to the switch (1) so as to disconnect and to isolate from each other the generator (4) and the coil (3) and then, after a predetermined time lag, to trigger a measurement phase.
    • 用于连接和断开电流或电压发生器和适于在NMR装置的测量室中产生磁场梯度的线圈的换向装置。 该装置包括安装在线圈(3)的供给电路(2)中的开关(1),由控制信号驱动,并且在打开位置适于将线圈(3)与发电机(4)完全隔离。 开关是适于在供应电路(2)打开时分离成连接到发电机(4)的部分(5)和连接到线圈(3)的部分(6)的双开关(1),独立地 的对方 或者,开关可以是包括至少一个场效应晶体管的高速开关。 用于控制线圈动作的过程包括在激励阶段结束之后并且恰好在测量阶段之前,向开关(1)发送打开信号以便断开并彼此隔离,发电机(4) 和线圈(3),然后在预定的时间滞后之后触发测量阶段。