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光电开关的工作原理是什么?

来源:网络发布者:电工基础发布时间:2026-03-04 21:33

光电开关的工作原理是什么? 光电开关（光电传感器）是光电接近开关的简称，它是利用被检测物对光束的遮挡或反射，由同步回路选通电路，从而检测物体有无的。物体不限于金属，所有能反射光线的物体均可被检测。光电

光电开关的工作原理是什么?

光电开关（光电传感器）是光电接近开关的简称，它是利用被检测物对光束的遮挡或反射，由同步回路选通电路，从而检测物体有无的。物体不限于金属，所有能反射光线的物体均可被检测。光电开关将输入电流在发射器上转换为光信号射出，接收器再根据接收到的光线的强弱或有无对目标物体进行探测。多数光电开关选用的是波长接近可见光的红外线光波型。

光电开关是由发射器、接收器和检测电路三部分组成。发射器对准目标发射光束，发射的光束一般来源于半导体光源，发光二极管（LED）、激光二极管及红外发射二极管。光束不间断地发射，或者改变脉冲宽度。受脉冲调制的光束辐射强度在发射中经过多次选择，朝着目标不间接地运行。接收器有光电二极管或光电三极管、光电池组成。在接收器的前面，装有光学元件如透镜和光圈等。在其后面的是检测电路，它能滤出有效信号和应用该信号。此外，光电开关的结构元件中还有发射板和光导纤维。三角反射板是结构牢固的发射装置。它由很小的三角锥体反射材料组成，能够使光束准确地从反射板中返回，具有实用意义。它可以在与光轴0到25的范围改变发射角，使光束几乎是从一根发射线，经过反射后，还是从这根反射线返回。

光电开关一般都具有良好的回差特性，因而即使被检测物在小范围内晃动也不会影响驱动器的输出状态，从而可使其保持在稳定工作区。同时，自诊断系统还可以显示受光状态和稳定工作区，以随时监视光电开关的工作。

光电开关工作原理

光电开关的原理是根据投光器发出的光束,被物体阻断或部分反射,受光器最终据此作出判断反应. The principle of photoswitch: the projector will ju dge and react on the basis of light beam from the projector which is interdicted by object or emitted partly.
■类型说明 Explanation of type 对射式（透过型）Diact type(through type) 对射式光电开关是将投光器与受光器置于相对的两个装置,光束也是在相对的两个装置之间,穿达投光器与受光器之间的物体会阻断光束并启动受光器。(图R1) Diact type photoswitch is designed that via the light beam between opposite-mounted transmitter and receiver; the object passing through these two devices will interrupt the light beam and start the receiver. (Fig R1)
扩散反射型（漫反射型） Diffuse reflection type 扩散反射型光电开关将投光器与受光器置于一体内,光电开关反射的光被检测物体反射回受光器。(图R2) Diffuse reflection type photoelectric switch integrates the transmitter and the receiver. Light reflected by the photoelectric switch is reflected back to the receiver by the
镜面反射型(反馈反射型) convergence reflection type(condensation type) 镜面反射型的反射式光电开关也将投光器与受光器置于一体，它不同于其它模式是它采用反射板将光线反射到光电开关，光电开关与反射板之间的物体虽然也会反射光线，但其效率远低于反射板，因而切断反射光束。 (图R3) Mirror reflective type photoelectric also integrates the transmitter and the light receiver. Its difference from other models is that reflectoris used to reflect light to the photoelectric switch.Though the object between the photoelectricswitch and reflector can reflect the light, it is much less efficient than the reflector so as to cut down reflected light (Fig. R3)
会聚型反射式（聚光型） convergence reflection type(condensation type) 会聚型反射式的光电开关的工作原理类似于直接反射式光电开关，然而其投光器与受光器聚焦于物距离，只有当物体出现在聚焦时，光电开关才有动作。(图R4) The working principle of convergence reflection type photo switch is similar to that of direct reflection type one, while its projector and light receiver focus on object distance, only when the object presents to the focus can the photo switch actuate. (Fig.R4)

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光电开关的原理是根据投光器发出的光束,被物体阻断或部分反射,受光器最终据此作出判断反应. The principle of photoswitch: the projector will ju dge and react on the basis of light beam from the projector which is interdicted by object or emitted partly.
■类型说明 Explanation of type 对射式（透过型）Diact type(through type) 对射式光电开关是将投光器与受光器置于相对的两个装置,光束也是在相对的两个装置之间,穿达投光器与受光器之间的物体会阻断光束并启动受光器。(图R1) Diact type photoswitch is designed that via the light beam between opposite-mounted transmitter and receiver; the object passing through these two devices will interrupt the light beam and start the receiver. (Fig R1)
扩散反射型（漫反射型） Diffuse reflection type 扩散反射型光电开关将投光器与受光器置于一体内,光电开关反射的光被检测物体反射回受光器。(图R2) Diffuse reflection type photoelectric switch integrates the transmitter and the receiver. Light reflected by the photoelectric switch is reflected back to the receiver by the
镜面反射型(反馈反射型) convergence reflection type(condensation type) 镜面反射型的反射式光电开关也将投光器与受光器置于一体，它不同于其它模式是它采用反射板将光线反射到光电开关，光电开关与反射板之间的物体虽然也会反射光线，但其效率远低于反射板，因而切断反射光束。 (图R3) Mirror reflective type photoelectric also integrates the transmitter and the light receiver. Its difference from other models is that reflectoris used to reflect light to the photoelectric switch.Though the object between the photoelectricswitch and reflector can reflect the light, it is much less efficient than the reflector so as to cut down reflected light (Fig. R3)
会聚型反射式（聚光型） convergence reflection type(condensation type) 会聚型反射式的光电开关的工作原理类似于直接反射式光电开关，然而其投光器与受光器聚焦于物距离，只有当物体出现在聚焦时，光电开关才有动作。(图R4) The working principle of convergence reflection type photo switch is similar to that of direct reflection type one, while its projector and light receiver focus on object distance, only when the object presents to the focus can the photo switch actuate. (Fig.R4)