Retro-Reflective Sensors
In reflective sensor , the emitter and receiver are placed in a single housing . The emitted light from the emitter is reflected back from a reflector to the receiver . If an object interrupts the reflected light then it fails to reach the receiver. It indicates the presence of an object. The receiver detects the change and acts accordingly . These are used in applications where the object can reflect light such as door and gate control systems. These are used where space is limited . These are very reliable and cost is less when compared to through beam sensor. These sensors can also have a light on and dark on mode selector switch to change when the sensor output is on .
Limitation : Sensing range is less when compared with through beam sensor. This is because the light has to travel to reflector and then to the sensor instead of just travelling straight to the receiver. It must install at two points on system i.e., emitter and reflector .
Photoelectric Sensor
A photoelectric sensor is a type of sensor used to detect the presence or absence of objects, as well as to measure distance, based on the principle of light reflection or interruption. It typically consists of a light transmitter and a receiver, which are positioned opposite each other with a gap between them.
Here in this article, we will discuss the definition of photoelectric sensors, the construction and working, various types, and the characteristics briefly. There are many advantages and applications of photoelectric sensors in day-to-day life. Let us discuss all those in this article.
Table of Content
- Photoelectric Sensor
- Components and Construction
- Types
- Characteristics
- Advantages
- Disadvantages
- Applications
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