The capacitive division image readout: a novel imaging device for microchannel plate detectors
The capacitive division image readout: a novel imaging device for microchannel plate detectors
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DOI：
10.1117/12.2024179
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发表时间：
2013-09
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影响因子：
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通讯作者：
J. Lapington;T. Conneely;S. Leach;L. Moore
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文献类型：
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作者：
J. Lapington;T. Conneely;S. Leach;L. Moore
电容分割图像读出（C-DIG）是一种简单而新颖的光子计数探测器图像读出，具有主要的性能优势。C-FET是包括三个元件的电荷定心装置：（i）提供事件电荷定位、事件电流返回路径和与检测器高电压的电隔离的电阻阳极，（ii）将事件瞬态信号电容耦合到第三元件的电介质衬底，（iii）读出装置;电容耦合电极的阵列，其在读出电荷测量节点之间划分信号。电阻阳极和电介质基板构成检测器的后接口，并将信号电容耦合到外部C-FET读出设备。C-MOSFET器件是无源多层印刷电路板型器件，包括隔离电极的矩阵，其几何形状限定电容网络。C-PCB采用传统的PCB几何结构制造，构造简单且经济。C-100的健壮性和简单性掩盖了它的性能优势。其电容性质避免了分区噪声，即与离散电荷收集相关的泊松噪声。限制位置分辨率的主要噪声是电子噪声。然而，C-100还向读出电子器件呈现低输入电容，最小化该噪声分量，从而最大化空间分辨率。优化的C-MEMS图案边缘几何形状可以提供~90%的线性动态范围。我们目前的数据显示的图像分辨率和线性度的C-CHS设备中的微通道板检测器和描述各种电子电荷测量方案，旨在利用的C-CHS设备的全部性能潜力。
The Capacitive Division Image Readout (C-DIR) is a simple and novel image readout for photon counting detectors offering major performance advantages. C-DIR is a charge centroiding device comprising three elements; (i) a resistive anode providing event charge localization, event current return path and electrical isolation from detector high voltage, (ii) a dielectric substrate which capacitively couples the event transient signal to the third element, (iii) the readout device; an array of capacitively coupled electrodes which divides the signal among the readout charge measurement nodes. The resistive anode and dielectric substrate constitute the rear interface of the detector and capacitively couple the signal to the external C-DIR readout device. The C-DIR device is a passive, multilayer printed circuit board type device comprising a matrix of isolated electrodes whose geometries define the capacitive network. C-DIR is manufactured using conventional PCB geometries and is straightforward and economical to construct. C-DIR’s robustness and simplicity belie its performance advantages. Its capacitive nature avoids partition noise, the Poisson noise associated with collection of discrete charges. The dominant noise limiting position resolution is electronic noise. However C-DIR also presents a low input capacitance to the readout electronics, minimising this noise component thus maximising spatial resolution. Optimisation of the C-DIR pattern-edge geometry can provide ~90% linear dynamic range. We present data showing image resolution and linearity of the C-DIR device in a microchannel plate detector and describe various electronic charge measurement scheme designed to exploit the full performance potential of the C-DIR device.