There are two types of Infrared communication in our world
Point to Point: It requires a line of sight between the transmitter and a receiver. In other words the transmitter and the receiver should be pointed to each other and there shouldn’t be any obstacles between them. Example is the remote control communication.
Diffuse Point: It doesn’t require any line of sight and the link between the transmitter and the receiver is maintained by reflecting or bouncing of the transmitted signal by surfaces like ceilings, roof, etc. Example is the wireless LAN communication system
Advantages of IR communication:
Security: Infrared communication has high directionality and can identify the source as different sources emit radiation of different frequencies and thus the risk of information being diffused is eliminated.
Safety: Infrared radiation is not harmful to human beings. Hence infrared communication can be used at any place.
High Speed data Communication: The data rate of Infrared communication is about 1Gbps and can be used for sending information like video signal.
Parts of IR communication system:
IR Transmittor- IR Sensor
The sensors could be utilized as a part of measuring the radiation temperature without any contact. For different radiation temperature ranges various filters are available. An infrared (IR) sensor is an electronic device that radiates or locates infrared radiation to sense some part of its surroundings. They are undetectable to human eyes.
An infrared sensor could be considered a Polaroid that briefly recalls how an area’s infrared radiation shows up. It is very regular for an infrared sensor to be coordinated into movement indicators like those utilized as a feature of private or business security systems. An IR sensor is shown in figure; basically it has two terminals positive and negative. These sensors are undetectable to human eyes. They can measure the heat of an object and also identify movement. The region wavelength roughly from 0.75µm to 1000 µm is the IR region. The wavelength region of 0.75µm to 3 µm is called close infrared, the region from 3 µm to 6 µm is called mid infrared and the region higher than 6 µm is called far infrared. IR sensors emits at a frequency of 38 KHz.
