传感器FS-N11CP 光电耦合器是以光为媒介传输电信号的一种电一光一电转换器件。它由发光源和受光器两部分组成。把发光源和受光器组装在同一密闭的壳体内，彼此间用透明绝缘体隔离。发光源的引脚为输入端，受光器的引脚为输出端，常见的发光源为发光二极管，受光器为光敏二极管、光敏三极管等等。光电耦合器的种类较多，常见有光电二极管型、光电三极管型、光敏电阻型、光控晶闸管型、光电达林顿型、集成电路型等。工作原理在光电耦合器输入端加电信号使发光源发光，光的强度取决于激励电流的大小，此光照射到封装在一起的受光器上后，因光电效应而产生了光电流，由受光器输出端引出，这样就实现了电一光一电的转换。
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