光电二极管响应速度由 CR 时间常数、载流子扩散时间和耗尽层中的载流子渡越时间等因素决定。与短波长光相比,长波长光使载流子扩散时间更长,因此光电二极管响应较慢。以下方法可提高响应速度。
1. 选择具有较低结电容的光电二极管。
2. 降低负载电阻。
3. 通过施加反向电压降低结电容。(请注意,暗电流会随着反向电压的增加而增加。)
是的,受光面以外的区域(如元件之间的间隙)对光敏感。该灵敏度与有效光敏区的灵敏度不匹配。
受光面以外的区域对光敏感,因此入射到那里的光会产生噪声信号并延迟响应速度。通过将光聚焦到一个小点上,使其不会入射到受光面以外的区域,或对受光面以外的区域进行遮光,可以消除此问题。作为替代方案,在芯片上受光面之外的区域上形成铝遮光膜或黑色遮光膜也可解决此问题。
几 Ω 的电阻。
滨松光电二极管的分流电阻由以下公式根据施加 10 mV 时测得的暗电流 (ID) 计算得出:
Rsh [Ω]=0.01 [V]/ID [A]
在比最大灵敏度波长短的波长范围内,光谱灵敏度特性几乎不受温度影响。然而,在比最大灵敏度波长长的区域,它具有正温度系数。
确定硅光电二极管响应速度的一个因素是"载流子扩散速度。"检测穿透到硅光电二极管的深部的长波长光时,载流子扩散速度的影响变得更显著,从而导致响应速度变慢。然而在检测短波长光时,响应速度受载流子扩散速度的影响较小。
折射率 n=1.51。
折射率 n=1.53。
折射率 n=1.53。
折射率 n=1.41。
树脂经常用于密封光电传感器(窗口粘合与树脂填充)。因此,使用清洁溶剂可能导致树脂膨胀或熔化,并且有时溶剂蔓延到封装内部。因此,建议使用焊接后不需要清洁的免清洗焊。
我们提供的产品支持无铅焊接。焊接方法因产品而异,因此请联系我们的销售办事处。
受光窗上的玻璃和树脂密封剂容易出现划痕和损坏。清洁时,用蘸有乙醇的棉拭子(棉签)轻轻擦拭。反复使用同一根棉拭子可能会因棉拭子上的碎屑或异物而造成窗口划痕。
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