输出饱和光量约为 10 mW,但与元件尺寸、入射光斑大小和反向偏压有关。为了避免对光电二极管造成可能的损坏,请在 1 W/mm2 或更低的光量下使用。
光电二极管噪声由约翰逊噪声平方与散粒噪声平方之和的平方根表示。约翰逊噪声与暗电流有关。暗电流与温度有关,因此暗电流会随着传感器温度的下降而减小。但除特殊情况(接近截止波长)外,散粒噪声与温度无关。随着温度下降,光电二极管的噪声也趋于降低。请联系我们的销售办事处,了解计算噪声的公式。
光伏元件在暴露于光时会产生电流。光电导探测器在暴露于光时会改变其电阻(导电性),因此必须使用偏压或偏置电流。
斩波并不总是必需的。斩波通常用于从周围环境中的外来光等因素中区分信号光,从而提高信噪比。
以下是斩波频率的一般指南。较低的斩波频率与探测器本身的 1/f 噪声有关,而较高的斩波频率会受到探测器响应速度的限制。因此,除非出现具体的问题,我们建议使用平稳区域内的斩波频率。我们用于测试 InSb 光电导探测器的斩波频率为 1200 Hz。
产品名称 | 斩波频率 |
---|---|
InSb 光电导探测器 | 几 kHz |
信号值与受光面无关,但噪声与受光面的平方根成反比。信噪比与受光面的平方根成正比。
要重新抽空金属杜瓦瓶,请使用专用的重新抽空工具(用于金属杜瓦的A3515 阀门操纵器),将其连接到排气装置。我们也可为客户执行重新抽空(但要收取服务费)。
请在不再能够看到液氮注入时产生的白色蒸汽后,等待 10 分钟后再开始使用。
对于新购买的典型金属杜瓦瓶,氮气制冷保持时间约为 20 小时。此后保持时间会逐渐减少,一年后大约是 10 小时。因此,每隔几年就需要重新抽空。
物体温度越高,发射能量越高,因此波长分布向短波长侧偏移。而在低温下,能量很小,因此波长分布会向长波长侧偏移,短波长下的能量水平会突然下降。以下是适用于不同物体温度的探测器的一般指南。
物体温度 | 探测器 |
---|---|
500 °C 或以上 | Si |
200 °C 或以上 | InGaAs |
100 °C 或以上 | InAs |
50 °C 或以上 | InSb、InAsSb(8 μm 波段) |
0 °C 或以上 | InAsSb(10 μm 波段) |
-50 °C 或以上 | 热电堆,II 类超晶格红外探测器 |
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