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公开(公告)号：US5077771A
公开(公告)日：1991-12-31
申请号：US317456
申请日：1989-03-01
摘要： A pulsed precision x-ray source includes a miniaturized internally self-shielding x-ray tube and an integral generator contained in a hand-held housing for generating timed bursts of x-ray having regulated energy level. A control grid and focus electrode within the tube enable precise on-off control of an electron beam directed to an x-ray emitting anode. The integral generator system includes an elongated, U-shaped unitary, molded plastic block mounted in the housing and includes a high voltage transformer having primary and secondary annular windings encased in a transformer portion of the block defining a central opening outside of the block for receiving a transformer core therethrough and, a capacitor-diode voltage multiplier stack connected to the secondary winding and having a positive node connectable to the anode and a negative node connectable to the cathode. A high voltage pulse width modulated switching circuit is connected to the primary annular winding to generate high voltages across said voltage multipler stack in order to control the energy of x-ray put out by the tube. A heater power supply supplies heater current to operate a heater in the tube. A focus element/grid control voltage power supply generates control voltages. A control circuit controls application of the control voltages to the focus element and the grid in order to switch the electron beam on and off in accordance with a preset value.
摘要翻译： 脉冲精密x射线源包括小型化的内部自屏蔽X射线管和包含在手持壳体中的积分发生器，用于产生具有调节能级的x射线的定时脉冲串。 管内的控制栅格和聚焦电极使得能够精确地对通向X射线发射阳极的电子束进行开 - 关控制。 整体式发电机系统包括一个细长的U形整体模制的塑料块，安装在壳体中，并且包括一个高压变压器，其具有封装在块的变压器部分中的初级和次级环形绕组，该变压器部分限定了用于接收的块的中心开口 连接到次级绕组并具有可连接到阳极的正节点和可连接到阴极的负节点的电容器二极管电压倍增器堆叠。 高电压脉冲宽度调制开关电路连接到主环形绕组，以在所述电压倍增器堆叠上产生高电压，以便控制由管放出的x射线的能量。 加热器电源提供加热器电流以在管中操作加热器。 焦点元件/电网控制电压电源产生控制电压。 控制电路控制对焦点元件和栅格的控制电压的施加，以便根据预设值来打开和关闭电子束。
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