H21A4

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

The H21A4 is an optoelectronic device that is capable of emitting light pulses and detecting any changes in the light pattern. It is commonly used in various industrial and consumer applications such as traffic monitoring, distance measurement, and automated control systems. This article provides an overview of the application field and working principle of the H21A4.

Applications of the H21A4

The H21A4 belongs to the category of optical sensors known as photointerrupters. Photointerrupters are sensing devices that rely on a beam of infrared light passing through an aperture or slot to detect the presence or absence of an object. The H21A4 is a type of photointerrupter known as a Slot Type Transistor Output (STRO). STROs are widely used in a range of applications such as automatic door openers, security systems, traffic counters, and vending machines.

The H21A4 is often used in environments where reliable light switching is important. For instance, in automatic door openers, when an intruder passes through the sensing area, the light beam emitted by the H21A4 photointerrupter is broken, resulting in the door being opened. In traffic counters, the H21A4 photointerrupter detects the passing of a person or vehicle, and its output signal can be used to count the number of people or vehicles that have passed.

The H21A4 also has applications in detection systems, such as burglar alarms. When a person passes through the sensing area, the light beam emitted by the H21A4 photointerrupter is broken, resulting in the alarm being triggered. In addition, the H21A4 can be used in automated control systems, such as those used in industrial processes, to detect changes in light patterns.

Working Principle of the H21A4

The H21A4 is an optoelectronic device which consists of an optical emitter and receiver. The optical emitter emits an infrared light which passes through an aperture or slot. When an object passes through this slot, the light is interrupted and the receiver detects this interruption.

The output of the receiver is then passed through an amplifier circuit which produces an output signal. This output signal can then be used to trigger a switch, count the number of objects passing through the aperture, or trigger an automated control system.

The H21A4 photointerrupter has a wide detection range and is highly reliable, making it suitable for a variety of applications. In addition, its compact size and low power consumption make it easy to integrate into existing systems.

Conclusion

The H21A4 is an optoelectronic device that is capable of emitting light pulses and detecting any changes in the light pattern. It belongs to the category of optical sensors known as photointerrupters, and is a type of photointerrupter known as a Slot Type Transistor Output (STRO). The H21A4 is used in a range of applications such as automatic door openers, security systems, traffic counters, and vending machines. It works by emitting an infrared light that passes through an aperture or slot, and detecting the interruption caused by an object passing through the slot. Its wide detection range and low power consumption make it suitable for a variety of applications.

The specific data is subject to PDF, and the above content is for reference