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2. 发明公开

EP0788277A2 Method and apparatus for reducing noise in a radiation capture device 失效
标题翻译：用于降低辐射检测装置中的噪声的方法和装置
公开(公告)号：EP0788277A2
公开(公告)日：1997-08-06
申请号：EP97100007.0
申请日：1997-01-02
申请人： Sterling Diagnostic Imaging, Inc.
发明人： Lee, Denny L.Y. , Palecki, Eugene F. , Williams, Cornell L.
IPC分类号： H04N5/217
CPC分类号： H04N5/361 , H01L27/14654 , H04N5/32 , H04N5/3575 , H04N5/3658
摘要： The detector comprises a radiation detecting element (10) with a radiation sensor (12), a read-out module (20) and a control signal source (34). The read-out module (20) comprises a charge accumulator (14) and a read-out switch (16), an amplifier (22) including a reset/enable switch (24), a first sample and hold circuit (27) and a second sample and hold circuit (31). The sensor (12) causes a charge whose magnitude is proportional to the intensity of the radiation to accumulate in a capacitor (14). The accumulated charge is read out by transferring it to the read-out module (20). To read out the storage charge, the signal generator (34) sends an enable pulse which actuates switch (24) and sets it to the off-position. This enables integrating amplifier (22) which now begins to integrate any charges appearing at its input. Thereafter, signal generator (34) sends a first sampling pulse that actuates a switch (26) for sampling the output of integrator and storing it in the first sample and hold capacitor (28). A second pulse delivered from signal generator (34) causes a transfer of all charges stored in capacitor (14) to the integrating amplifier (22). The sample and hold circuits (27,31) store the output of the integrator (22) at the time of the end of the sampling pulse. Thus, any noise due to the initiation of this pulse is also stored in the first sample and hold circuit and would also appear with the radiation data signal. Both output signals containing noise components are subtracted from each other which results in a radiation data signal substantially free from enable/reset switching noise.
摘要翻译：该检测器包括与辐射传感器（12）的放射线检测元件（10），读出模块（20）和一个控制信号源（34）。所读出的模块（20）包括一个电荷存储器（14）和上放大器（22）的读出开关（16）包括复位/启用开关（24），第一采样和保持电路（27）和第二采样和保持电路（31）。所述传感器（12）引起的电荷，其大小正比于辐射的强度在一个电容器（14）中积累。累积的电荷通过它传递环到所读出的模块（20）读出。为了读出存储的电荷，所述信号发生器（34）发送，以使脉冲哪个Actuate的开关（24），并将其设置为关闭位置。这使得INTEGRA婷放大器（22）现在开始整合其输入端出现的任何费用。有后，信号发生器（34）发送一个第一取样脉冲并启动用于采样积分器的输出和所述第一样品中它存储和保持电容器（28）的开关（26）。从信号发生器（34）输送的第二脉冲使转印的存储在电容器（14）的所有费用的INTEGRA婷放大器（22）。采样和保持电路（27,31）存储在采样脉冲的结束的时间积分器（22）的输出。因此，由于该脉冲的开始的任何噪声被这样存储的第一样品中和保持电路，因此就会与所述辐射数据信号出现。包含噪声分量两者的输出信号被从海誓山盟这导致辐射数据信号从使能/重置开关噪声基本上不含减去。

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