How does a photoelectric detection switch work? And what is his working principle?

General photoelectric switch is not detected when the object, OUTPUT foot level is a level, when the object is detected is a level, no object is high that the object is detected is low, no object is low that the object is detected is high, you can use a multimeter to measure the specific.

Photoelectric switch (photoelectric sensor): it is the use of the detected object on the light beam blocking or reflecting, by synchronizing the circuit to select the circuit, so as to detect the object with or without. Objects are not limited to metal, all objects that can reflect light can be detected.

Photoelectric switch will be the input current in the transmitter is converted into a light signal shot, the receiver and then according to the strength of the received light or the presence or absence of the target object detection. Security systems are common photoelectric switch smoke alarms, industry is often used to keep track of the number of movements of the mechanical arm.

Extended information:

Applications:

Photoelectric switches have been used for crop level detection, liquid level control, product counting, width discrimination, speed detection, fixed-length shear, hole recognition, signal delay, automatic door sensing, and color-coded detection, Punching and shearing machines and safety protection and many other fields. In addition, the use of infrared hidden, but also in banks, warehouses, stores, offices and other needs of the occasion as a burglar alarm.

Commonly used infrared photoelectric switch, is the use of objects on the near-infrared beam of reflection principle, by synchronizing the circuit to sense the reflection back to the strength of the light and detect the presence or absence of the object to achieve the function of the photoelectric sensor is first issued by the infrared beam to reach or through the object or the mirror to the infrared beam of reflection, the photoelectric sensor to receive the reflected beam, according to the beam of the strength of the object judgment. The photoelectric sensor receives the reflected beam and judges the existence of the object according to the strength of the beam.

The types of infrared photoelectric switch is also very much, generally speaking, there is a mirror reflective photoelectric switch, diffuse reflective, slot, counter-reflective, fiber-optic and several other major types. Photoelectric switch fast easy to superior automation selection have included.

In different occasions to use different photoelectric switch, for example, in the electromagnetic vibration feeder often use fiber optic photoelectric switch, in the intermittent packaging machine packaging film supply and delivery often use diffuse reflective photoelectric switch, in the continuous high-speed packaging machine often use slot photoelectric switch.

Reference:

Baidu Encyclopedia-Photoelectric Switch