Photoelectric sensor is a device that converts optical signals into electrical signals. Its working principle is based on photoelectric effect. Photoelectric effect refers to the phenomenon that when light irradiates on some substances, the electrons of substances absorb the energy of photons and produce the corresponding electrical effect. According to the different phenomena of photoelectric effect, photoelectric effect is divided into three categories: external photoelectric effect, internal photoelectric effect and photovoltaic effect.

没有信号输出的原因

Reason for no signal output

首先要考虑的是接线或配置的问题。对于对射型光电传感器必须由投光部和受光部组合使用，两端都需要供电；而回归反射型必须由传感器探头和回归反射板组合使用；同时，用户必须给传感器提供稳定电源，如果是直流供电，必须确认正负极，如若正负极连接错误则会导致输出信号没有。

The first thing to consider is wiring or configuration. For the opposite type photoelectric sensor, it must be combined by the light projection part and the light receiving part, and power supply is required at both ends; The regression reflection type must be used by the combination of sensor probe and regression reflection plate; At the same time, the user must provide a stable power supply for the sensor. If it is DC power supply, the positive and negative poles must be confirmed. If the positive and negative poles are connected incorrectly, the output signal will not be.

上述的原因分析是对光电传感器本身的考虑，我们还需要考虑的是检测物体的位置问题，如果检测物体不在检测区域，这样的检测是徒劳的。检测物体必须在传感器可以检测的区域内，也就是光电可以感知的范围内。其次，要考虑传感器光轴有没有对准问题，对射型的投光部和受光部光轴必须对准，对应的回归反射型的探头部分和反光板光轴必须对准。同样还要考虑的是检测物体是否符合标准检测物体或者zui小检测物体的标准，检测物体不能小于zui小检测物体的标准，从而避免导致对射型、反射型不能很好检测透明物体，像反射型对检测物体的颜色有要求，颜色越深，检测距离就越近。

The above reason analysis is the consideration of the photoelectric sensor itself. We also need to consider the position of the detected object. If the detected object is not in the detection area, such detection is futile. The detected object must be within the area that can be detected by the sensor, that is, within the range that can be perceived by photoelectric. Secondly, whether the optical axis of the sensor is aligned or not should be considered. The optical axis of the projection part and the light receiving part of the opposite reflection type must be aligned, and the optical axis of the corresponding regression reflection type probe part and the reflector must be aligned. Similarly, we should also consider whether the detection object meets the standard detection object or Zui small detection object. The detection object should not be less than the standard of Zui small detection object, so as to avoid that the reflection type and reflection type can not detect transparent objects well. For example, the reflection type has requirements for the color of the detection object. The darker the color, the closer the detection distance.

如果以上情况都可以很明确地做出排除后，我们需要做的事就是检测环境的干扰因素。如光照强度不能超出额定范围；如果现场环境有粉尘，就需要我们定期清理光电传感器探头表面；或者是多个传感器紧密安装，互相产生干扰；还有一种影响比较大的是电气干扰，如果周围有大功率设备，产生干扰时必须要有相应的抗干扰措施。如果做过上述的逐一排查，这些因素都可以明确地排除还是没有信号输出的话，建议退回厂家检测判断。

If the above situations can be eliminated clearly, what we need to do is to detect the interference factors of the environment. If the light intensity cannot exceed the rated range; If there is dust in the site environment, we need to clean the surface of photoelectric sensor probe regularly; Or multiple sensors are closely installed to interfere with each other; Another major impact is electrical interference. If there are high-power equipment around, corresponding anti-interference measures must be taken when interference occurs. If these factors can be clearly eliminated after the above troubleshooting one by one, or there is no signal output, it is recommended to return it to the manufacturer for detection and judgment.