So what is right and wrong color aberration? To put it simply, it is an ordinary diffuse reflex sensor, for example, if you set punctuality to learn a black object, assuming that the sensing interval of the black object is set to 50 mm, then when the sensor detects a white object, the practical action interval may reach 80 mm, this sensor is suitable for finding white objects in dark objects, but when it is used to detect objects of different colors in production, this ordinary diffuse reflection with color difference cannot be. At this point, the BGS principle is needed.
The principle of background suppression of diffuse reflection is based on the principle of triangulation. The sensor that uses this principle also has two lenses, one emitting and one accepting, and when it detects the light reflected back by the object, it can not only detect the intensity of the light returned, but also detect the viewpoint of the returned light, as shown in the following figure: in the direction of light emission, the light reflected by the target at different positions hits the viewpoint of the receiving lens is different, and the receiving lens is a gathering lens, which will gather the light reflected back from the same position to a certain point on the receiving chip, that is, The position of the aggregation point on the chip actually reflects the position of the measured object. At this time, the chip converts the position information into an electrical signal to the processor. In general, the light sensor and the ranging sensor have the triangulation principle, the difference is that the switching sensor acceptance chip is a relatively rough diode array, and the ranging sensor acceptance chip is a CCD chip or CMOS chip.
In general, the sensor based on the BGS principle collects the spacing information of the object, which has little to do with the surface reflectivity of the object.
This is a detailed explanation of the BGS principle for triangulation of photoelectric sensors according to Turck sensors
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