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    • 8. 发明专利
    • Nuclear magnetic resonance apparatus
    • 核磁共振装置
    • JPS61118648A
    • 1986-06-05
    • JP23994584
    • 1984-11-14
    • Jeol Ltd
    • FUKUSHIMA YUTAKA
    • G01R33/20G01N24/08G01N33/00G01R33/46G01R33/483G01R33/58
    • G01R33/583G01N24/08G01R33/4616G01R33/483
    • PURPOSE:To make it possible to automatically set the pulse width of a 90 deg. pulse, by repeating the measurement of the pulse width of a high frequency pulse while timewise changing said pulse width and comparing the FID signal obtained by each measurement with a reference signal. CONSTITUTION:A control circuit 16 generates a pulse at an appropriate cycle from a pulse generator 15 and increases the pulse width there of by 1mus from an initial value (e.g., 1mus). The FID signal induced in a transmitting-receiving coil 3 is taken out through a gate 10 and a demodulator 11. A reference value Vn is set to the upper limit value of noise and, if the FID signal exceeds this level even instantaneously, a comparator 17 generates a pulse and the control circuit 16 increase the pulse width of the next high frequency pulse by one step. When this pulse width becomes equal to the width of a 180 deg. pulse, the amplitude of the FID signal comes to zero and the comparator 17 generates no pulse. The control circuit 16 stops the change in the pulse width on the basis of this state and set one half of the pulse width at this time as the pulse width of a 90 deg. pulse to start final measurement.
    • 目的:使自动设置90度的脉冲宽度成为可能。 通过重复对高频脉冲的脉冲宽度的测量,同时改变所述脉冲宽度并将每次测量获得的FID信号与参考信号进行比较。 构成:控制电路16从脉冲发生器15以适当的周期产生脉冲,并将其上的脉冲宽度从初始值(例如,1mus)增加1mus。 在发送接收线圈3中感应的FID信号通过门10和解调器11取出。参考值Vn被设置为噪声的上限值,并且如果FID信号甚至瞬间超过该电平,则比较器 17产生脉冲,并且控制电路16将下一个高频脉冲的脉冲宽度增加一步。 当该脉冲宽度等于180度的宽度时。 脉冲,FID信号的幅度变为零,并且比较器17不产生脉冲。 控制电路16基于该状态停止脉冲宽度的变化,此时将脉冲宽度的一半设为90度的脉冲宽度。 脉冲开始最终测量。