Overview Of Photoelectric Position Sensors

Used in positioning systems, simulating the process of aligning the psd to the object to determine the relative position between the psd and the object; the center of the aligning object 1 is equipped with a high-brightness light-emitting diode 2 and the psd sensor 4 is installed in the micro-motion. On the working platform; after the light beam emitted by the diode is focused by the optical system 3, the light spot is imaged on the receiving photosensitive surface of the psd placed on the focal plane of the lens, and this light spot signal is converted into an electrical signal by the pre-amplifier circuit 5. Then, sample 6 through a/d and send it to computer 7 for processing. In order to determine the position of the psd aligned with a certain point on the object plane. When the alignment position moves within the measurement range, the distance between the light spot and the two electrodes of the psd changes, so that the output current of the two electrodes changes with the change of the light spot position. Therefore, by measuring the output current of the two electrodes of the sensor, you can know The light source on the plane of the psd and the alignment object is the object to be measured. The light emitted by it is projected on the photoelectric element. The output of the photoelectric element reflects some physical parameters of the light source. This type of photoelectric sensor can be used for photoelectric colorimetry at high temperature. Meter and illuminance meter. The light flux emitted by the constant light source passes through the measured object, part of which is absorbed, and the remaining part is projected onto the photoelectric element. The amount of absorption depends on certain parameters of the measured object. Can be used to measure transparency and turbidity. The luminous flux emitted by the constant light source is projected onto the measured object, and then projected onto the photoelectric element after being reflected by the surface of the measured object. The intensity of the reflected light depends on the nature and state of the surface of the measured object, so it can be used to measure the surface roughness of the workpiece, the whiteness of the paper, and so on.　The luminous flux emitted from the constant light source is blocked by the measured object on the way to the photoelectric element, which weakens the luminous flux projected on the photoelectric element. The output of the photoelectric element reflects the size or position of the measured object.