Optoelectronic sensors use optoelectronic components as detection elements. First, they convert the changes in the measured quantity into changes in the signal, and then, with the help of optoelectronic components, further transform the optical signals into electrical signals. Optoelectronic sensors generally consist of three parts: a light source, an optical path, and optoelectronic components. The optoelectronic detection method has advantages such as high precision, fast response, and non-contact, and can measure multiple parameters. Sensors have a simple structure, flexible and diverse forms, and small size. In recent years, with the development of optoelectronic technology, optoelectronic sensors have become a series of products. Their variety and output are increasing day by day. Users can choose various specifications of products according to their needs and obtain wide applications on various light industry automatic machines.
1. Optical-electrical strip deviation detector
The strip deviation detector is used to detect the magnitude and direction of the deviation of strip materials from the correct position during processing, thereby providing a deviation correction signal for the bias correction control circuit. It is mainly used in dyeing, paper feeding, film, and magnetic tape production processes.
The principle of the optoelectronic strip deviation detector is shown in Figure 1. The light emitted by the light source passes through lens 1 and converges into a parallel beam, which is directed towards lens 2 and subsequently focused onto the photoresistor. During the journey of the parallel beam reaching lens 2, part of the light is blocked by the measured strip material, reducing the amount of light reaching the photoresistor.