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C
- C-band, L-band - C 波段，L 波段
- Cathode blue sensitivity, Blue sensitivity index - 阴极蓝色灵敏度，蓝敏度指数
- Cathode luminous sensitivity - 阴极亮度灵敏度
- Cathode radiant sensitivity - 阴极辐射灵敏度
- Cathode type - 阴极类型
- CDR (clock and data recovery) - CDR（时钟和数据恢复）
- CDS (correlated double sampling) - CDS（相关双采样）
- Center limiting resolution - 中心极限分辨率
- Channel diameter - MCP - 通道直径 - MCP
- Channel pitch - 通道间距
- Compton scattering - 康普顿散射
- Crosstalk - 串扰
- Cutoff frequency (fc) - 截止频率 (fc)
C-band, L-band - C 波段，L 波段
用于光通信的波段分类。C 波段和 L 波段的光谱范围为 1530 nm 至 1625 nm。根据光谱范围使用其他波段名称，如下所示。
- L 波段：1565 nm 至 1625 nm
- C 波段：1530 nm 至 1565 nm
- S 波段：1460 nm 至 1530 nm
- E 波段：1360 nm 至 1460 nm
- O 波段：1260 nm 至 1360 nm
Cathode blue sensitivity, Blue sensitivity index - 阴极蓝色灵敏度，蓝敏度指数
蓝敏度指数是在用于测量阴极亮度灵敏度的测量系统中插入蓝色滤波器 (CS 5-58) 时，光阴极面产生的光电电流。蓝敏度指数是闪烁计数中必不可少的参数，因为闪烁计数中经常使用的 NaI(Tl) 闪烁会产生蓝色发光。
Cathode luminous sensitivity - 阴极亮度灵敏度
阴极亮度灵敏度是指在 2856K 的分布温度下工作的钨丝灯中，每入射光通量（10-5 至 10-2 流明）从光阴极面产生的光电电流。当比较具有相同或类似光谱灵敏度特性的光电管时，阴极和阳极亮度灵敏度特别有用。
阴极亮度灵敏度以 uA/lm（微安/流明）表示。请注意，流明是用于可见光区域中光通量的单位，因此这些值对于灵敏度范围超出可见光区域的光电管可能是无意义的。
Cathode radiant sensitivity - 阴极辐射灵敏度
辐射灵敏度是光阴极面的光电电流除以给定波长下的入射辐射功率，以 A/W（安培/瓦）表示。量子效率 (QE) 是从光阴极面发射的光电子数量除以入射光子数。量子效率通常以百分比表示。在给定波长下，量子效率和辐射灵敏度的关系如公式中所示。$$ QE=\biggl( \frac{S \cdot 1240}{\lambda}\biggr)\cdot 100\ [％] $$ S：感光灵敏度 (A/W)
λ：波长 (nm)
Cathode type - 阴极类型
阴极亮度灵敏度是指在 2856K 的分布温度下工作的钨丝灯中，每入射光通量（10-5 至 10-2 流明）从光阴极面产生的光电电流。当比较具有相同或类似光谱灵敏度特性的光电管时，阴极和阳极亮度灵敏度特别有用。
阴极亮度灵敏度以 uA/lm（微安/流明）表示。请注意，流明是用于可见光区域中光通量的单位，因此这些值对于灵敏度范围超出可见光区域的光电管可能是无意义的。
CDR (clock and data recovery) - CDR（时钟和数据恢复）
用于恢复时钟和数据的器件。从 CDR 输出的数据与输入数据不完全相同，并与恢复的时钟的时序同步。
CDS (correlated double sampling) - CDS（相关双采样）
一种信号处理方法，最常用于减少 CCD 中的读出噪声。通过 FDA 检测到的 CCD 信号输出包含源自检测节点电容的 kTC 噪声。kTC 噪声也称为热噪声，总是由 CCD 之类的电荷电压转换器件中的复位操作生成。输出中的 kTC 噪声可以通过 CDS 来降低，它可以检测信号电荷在探测节点中流动之前和之后的电压差异。CDS 还用于降低 CMOS 图像传感器中的噪声。
Center limiting resolution - 中心极限分辨率
极限分辨率显示了描绘图像细节的能力。这表示为光阴极面上每毫米的最大线对数（1 线对 = 一对黑白线），当黑白条纹图案聚焦在光阴极面时可以辨别。
Channel diameter - MCP - 通道直径 - MCP
MCP 各个通道的直径。MCP 的孔径和间距限制了可用的最小空间分辨率。
Channel pitch - 通道间距
有源元件（例如 MCP 的通道或者 PMT 或光电二极管阵列的元件）之间的中心间距。MCP 的通道或者像素尺寸和间距限制了可用的空间分辨率。
Compton scattering - 康普顿散射
X 射线和 γ 射线与粒子（电子等）碰撞时发生散射并损失部分能量的现象。此现象被认为指示了 X 射线等的粒子特性。
Crosstalk - 串扰
入射光信号在元件中产生的电信号泄漏到相邻元件的现象。在 MPPC 中，入射光子在 APD 像素中激发的载流子在雪崩过程中倍增。在此过程中，可能会生成与入射光子不同的光子。如果这些光子被其它 APD 像素检测到，则 MPPC 输出将高于实际进入 MPPC 的光子数。此现象被认为是 MPPC 中出现串扰的一个原因。
Cutoff frequency (fc) - 截止频率 (fc)
在较低频率下，器件输出比恒定输出低 3 dB 时的频率。截止频率 (fc) 和上升时间 (tr) 之间的关系大致可以用以下公式表示。$$tr [s]=\frac{0.35}{fc}[Hz]$$
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