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Photoelectric Sensor Technology and Its Adjustment Method

Adjustment Method of Photoelectric Sensor

The sensitivity of photoelectric sensor can be adjusted by the sensitivity potentiometer of the receiving equipment. The sensitivity potentiometer can be divided into two types: the light quantity adjustment type and the operation level adjustment type. Generally, the center of point A and point B is the best sensitive position, but if the illumination of either side is not stable, the detection state can be stabilized by slightly reducing or improving the sensitivity.

Photoelectric Sensor Technology and Its Adjustment Method

Generally known as photoelectric sensors, products project light into the detection area, receive light passing through the detection area or reflected by the detection area, and obtain information about the presence or absence of objects or the characteristics of objects in the detection area based on the amount of light received.

The commonly used photoelectric sensors have many kinds according to the setting conditions or the different detection objects, so it is known that there are such photoelectric sensors, that is, when the object is actually placed in the detection area, the sensitivity is adjusted, and the appropriate detection value is obtained by adjusting the power of projected light and the magnification of received light. Then, based on the test value obtained by changing the position of the object to be detected, the threshold used to determine the detection value is determined.

In this way, in the photoelectric sensor, the condition in the detection area is determined by comparing with the object, which corresponds to the sensitivity of the detection value and the threshold value of the detection value obtained for evaluation and discrimination. It is well known that there are photoelectric sensors, in order to make these adjustments easy, the detection value or threshold value will be displayed numerically.

In addition, it is also known that there is a photoelectric sensor, in order to be able to display the value of the non-zero detection value in the background detection state, so as to clearly grasp whether the displayed detection value corresponds to the background or the detected object, and store the background level as the zero-return standard value. Indicates the detection value minus the return to zero standard value.

Unlike a measuring instrument designed to display measured physical quantities (e.g. distances) by physical units (e.g. mm), the detection value of a general photoelectric sensor is defined as the relative value of any scale in its use, and the intensity of light received according to its use varies. Thus, the condition in the detection area can be adjusted to correspond to the sensitivity of the detection value, so as to obtain the detection value in a moderate range. In addition, there are discrete manufacturing or setting states of photoelectric sensors. Therefore, when preparing multiple photoelectric sensors, the sensitivity between them is not consistent, and generally it is not necessary. As for the threshold, it is also adjusted according to the object after the sensitivity is determined.

However, in the case that multiple photoelectric sensors are suitable for the same use condition, it is required to use the result after adjusting the original photoelectric sensor against the physical object, and to reduce the effort of adjusting other photoelectric sensors. This situation will occur when multiple photoelectric sensors are used in parallel in space, and when photoelectric sensors are assembled into other mass-produced devices. In this situation, the existing photoelectric sensors, even for the second photoelectric sensor, must spend the same effort to adjust as the original photoelectric sensor.

In addition, even when the photoelectric sensor is used alone, there is insufficient automatic adjustment function (teaching function) with only sensitivity or threshold. That is, even if users of photoelectric sensors can use the automatic adjustment function of sensitivity or threshold, they want to adjust threshold manually at least in order to get the best detection status. However, according to the existing photoelectric sensors, it is difficult to adjust manually because the results of automatic adjustment of sensitivity before manual adjustment are determined by machinery.


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