Application of photoelectric switch on various occasions

Due to the fast response speed, the photoelectric sensor can realize non-contact measurement, and has high accuracy, high resolution, and good reliability. Combined with the advantages of the photoelectric sensor of small size, light weight, low power consumption, and easy integration, it is widely used in military, aerospace, and communications. , Smart home, smart transportation, security, LED lighting, toys, testing and industrial automation control and other fields.

1. When no bill passes, the receiving tube lights up and the output is 0. When a banknote passes for an instant and blocks the infrared light, the luminous flux of the receiving tube is insufficient, and the output is 1. After the bill is passed, the receiving tube receives infrared light transmission. In this way, a pulse signal is generated at the output of this part of the circuit. After subsequent circuit shaping and amplification, these signals are input to the single-chip microcomputer to drive the motor to complete the corresponding counting and display. The banknote counter uses two sets of photoelectric sensors to detect the integrity of banknotes to prevent incomplete banknotes from being counted. The count of banknotes is detected by the photoelectric sensor, and then the number of banknotes is accumulated. The liquid crystal display and external display are used to directly display the number of banknotes to the user, and automatically alarm the user when an abnormality occurs.

2. Application of photoelectric sensors in automated production lines: photoelectric detection methods have the advantages of high accuracy, fast response, non-contact, etc., and are widely used in light industrial automation machinery.

3. Application of photoelectric sensor in automatic meter reading system: With the development of microelectronics technology, sensor technology, computer technology and modern communication technology, photoelectric sensor can be used to develop automatic meter reading system. The aluminum plate of the meter is driven by the torque generated by the eddy current and the magnetic field. A photoelectric sensor is used to convert the rotation speed of the aluminum plate into the number of pulses. For example, when the rotating bright aluminum disk is partially blacked, coupled with the reflective photoelectric transmitter and receiver pair tube, when the aluminum disk spirals, pulses are generated in the local blackened area, and the rotating sampling of the aluminum disk can be converted into corresponding pulses. Count, and send it to the T0 port of the CPU for counting processing through the photoelectric coupling isolation circuit. The photoelectric coupling isolator can effectively prevent interference signals from entering the microcomputer. Combined with other transmission methods, an automatic meter reading system can be formed.

4. Photoelectric correction instrument: the correction instrument is used to detect the size and direction of the tape material deviating from the correct position during the processing process, and provides the correction signal for the correction control circuit. It is mainly used for the production of printing and dyeing, paper feeding, film, tape and other processes.