Photoelectric sensor technology and its adjustment method

A type of product generally known as a photoelectric sensor. It projects light to the detection area, receives light transmitted through the detection area or light reflected by the detection area, and obtains the presence or absence of objects in the detection area based on the amount of received light. Information about the characteristics.

There are many types of photoelectric sensors in common use depending on the setting conditions or detection objects. Therefore, there have been known photoelectric sensors in the past, that is, when the object is actually placed in the detection area, the sensitivity is adjusted, and the projected light power and reception are adjusted. An appropriate detection value is obtained by optical magnification, and then, based on the detection value obtained by experimental detection by changing the position of the detection target, etc., a threshold value for determining the detection value is determined.

In this way, in the photoelectric sensor, the sensitivity to make the situation in the detection area correspond to the detection value and the threshold value used for evaluation and discrimination of the detection value are determined in comparison with the actual product. However, such photoelectric sensors are known. In order to facilitate these adjustment operations, the detection value or the threshold value is displayed numerically.

In addition, there is also known a photoelectric sensor, in order to be able to display the value as zero even if it is a non-zero detection value in the background detection state, so as to grasp at a glance whether the displayed detection value corresponds to the background or the detection target. Yes, store the background level as the zero-return standard value, and display the value minus the zero-return standard value from the detection value.

Unlike the case of a measuring instrument whose purpose is to display the measured physical quantity (such as distance) in physical units (such as mm), the detection value of a general-purpose photoelectric sensor is determined as the relative value of an arbitrary scale under its use. The intensity of the light received by the usage situation is also various. Therefore, it is possible to adjust the sensitivity of the detection area corresponding to the detection value according to the actual object, so as to obtain the detection value within a proper range. In addition, there are also variations in the manufacturing or setting states of photoelectric sensors. Therefore, when preparing multiple photoelectric sensors, the sensitivity between them is not consistent, and generally there is no need for this. Regarding the threshold value, it is also adjusted against the actual product after determining the sensitivity.