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.

沒有信號輸出的原因

Reason for no signal output

首先要考慮的是接線或配置的問題。對于對射型光電傳感器必須由投光部和受光部組合使用，兩端都需要供電；而回歸反射型必須由傳感器探頭和回歸反射板組合使用；同時，用戶必須給傳感器提供穩定電源，如果是直流供電，必須確認正負極，如若正負極連接錯誤則會導致輸出信號沒有。

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.

上述的原因分析是對光電傳感器本身的考慮，我們還需要考慮的是檢測物體的位置問題，如果檢測物體不在檢測區域，這樣的檢測是徒勞的。檢測物體必須在傳感器可以檢測的區域內，也就是光電可以感知的范圍內。其次，要考慮傳感器光軸有沒有對準問題，對射型的投光部和受光部光軸必須對準，對應的回歸反射型的探頭部分和反光板光軸必須對準。同樣還要考慮的是檢測物體是否符合標準檢測物體或者zui小檢測物體的標準，檢測物體不能小于zui小檢測物體的標準，從而避免導致對射型、反射型不能很好檢測透明物體，像反射型對檢測物體的顏色有要求，顏色越深，檢測距離就越近。

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.

如果以上情況都可以很明確地做出排除后，我們需要做的事就是檢測環境的干擾因素。如光照強度不能超出額定范圍；如果現場環境有粉塵，就需要我們定期清理光電傳感器探頭表面；或者是多個傳感器緊密安裝，互相產生干擾；還有一種影響比較大的是電氣干擾，如果周圍有大功率設備，產生干擾時必須要有相應的抗干擾措施。如果做過上述的逐一排查，這些因素都可以明確地排除還是沒有信號輸出的話，建議退回廠家檢測判斷。

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.