Discuss the various application of photoelectric sensor with neat sketch.

A photoelectric sensor is a type of sensor that utilizes light to detect the presence or absence of objects, as well as their distance or speed. It operates on the principle of emitting a light beam (usually infrared or visible light) and detecting the changes in light intensity as it reflects back after interacting with the object. These sensors are commonly used in various industries and mechatronic systems due to their non-contact sensing capabilities, high precision, and versatility. They are classified based on the operating principle into three main types: through-beam sensors, retro-reflective sensors, and diffuse-reflective sensors. Each type has different applications depending on the requirements of the task at hand.

### 1. Material Handling Systems
In automated material handling systems, photoelectric sensors are extensively used to detect the presence or absence of materials on conveyor belts. For instance, they are used in sorting systems to identify items and sort them according to size, shape, or material type. These sensors can provide real-time data on the flow of materials and prevent jams or overloads. 

In such systems, through-beam sensors are often used because they have a long-range detection capability, ensuring that objects can be detected from a distance.

### 2. Safety Systems
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