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光子计数头
H8259
H8259 系列是一款光子计数头设备，包含一个 28 mm（1-1/8 英寸）直径侧窗型光电倍增管、高速光子计数电路和一个高压电源电路。由于热噪声的原因，在近红外区域灵敏度较高的光电倍增管通常具有较大的暗计数，但由于选择了低噪声光电倍增管，因此可获得高信噪比的测量。光电倍增管的高压电源和鉴别级别已按最佳值预设，只需连接 +5 V 电源即可进行光子计数测量。还包括一个电子门电路（快门电路），以消除测量中的外来光，例如激发光。
详细参数
| 光阴极面区域形状 | 正方形 |
|---|---|
| 光阴极面区域尺寸 | 4 x 20 mm |
| 波长（短） | 185 nm |
| 波长（长） | 680 nm |
| 波长（峰值） | 400 nm |
| 尺寸 (W x H x D) | 38.0 x 95.0 x 50.0 mm |
| 输入电压 | +4.5 至 +5.5 V |
| 最大值 输入电压 | 6 V |
| 最大值 输入电流 | 80 mA |
| 300 nm 处的计数灵敏度典型值 | 2.1 x 105 s-1・pW-1 |
| 400 nm 处的计数灵敏度典型值 | 2.6 x 105 s-1・pW-1 |
| 500 nm 处的计数灵敏度典型值 | 1.9 x 105 s-1・pW-1 |
| 600 nm 处的计数灵敏度典型值 | 7.5 x 104 s-1・pW-1 |
| 700 nm 处的计数灵敏度典型值 | 1.5 x 103 s-1・pW-1 |
| 计数线性度 | 2.5 x 106 s-1 |
| 暗计数典型值 | 30 s-1 |
| 暗计数最大值 | 80 s-1 |
| 脉冲对分辨率 | 35 ns |
| 输出脉冲宽度 | 30 ns |
| 输出脉冲高度最小值 | 2 V |
| 输出脉冲高度典型值 | 2.2 V |
| 建议的负载电阻 | 50 Ω |
| 信号输出逻辑 | 正逻辑 |
| 工作环境温度 | +5 至 +40 °C |
| 储存温度 | -20 至 +50 °C |
| 重量 | 220 g |
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