SF4-AH28-N

Optical sensors are devices used to translate physical effects caused by light into a signal which can be read and interpreted by electronic systems. The most common optical sensors are photointerrupters, which detect a beam of light emitted from a light source, such as an LED or infrared diode. The SF4-AH28-N, a slot type photointerrupter with logic level output, is one of the most commonly used optical sensors today.

Overview

The SF4-AH28-N is a slot type photointerrupter with a logic level output. It consists of an infrared emitter and an infrared detector that is positioned in an optically-shielded located within a moulded plastic housing. The emitter and detector are arranged so that a gap is created in the middle of the assembly. Depending on the configuration, the output will be either an NPN or PNP transistor.

Principle of Operation

The SF4- AH28-N is typically used to detect the presence or absence of an object passing through the gap. When an object passes in front of the gap, the light beam is broken, which is detected by the receiver, resulting in a change in the output state from low to high or vice versa. The output is the NPN or PNP transistor which can be used as an input to other electronic systems, such as controllers or logic gates. The response time of the SF4-AH28-N is typically 15ms or less.

Applications

The SF4-AH28-N is an ideal choice for applications that require the presence or absence of an object to be detected quickly. It is commonly used in robotics, industrial automation, as well as security and surveillance. For example, it can be used for the detection of a person in a doorway for a security system, or for the detection of a box or item on a conveyor for an automated system. It can also be used in lieu of a mechanical switch, as it is much faster and more reliable.

Conclusion

The SF4-AH28-N is a widely used optical sensor due to its fast response time and reliable operation. It is a cost-effective solution for applications which require the detection of an object. It is also versatile as it can be used with either an NPN or PNP transistor output. The SF4-AH28-N is an ideal choice for a variety of applications in robotics, industrial automation, and security and surveillance.