(b) The radiation thermometer is known as pyrometer. It is a non-contact temperature sensor that measures temperature from the amount of thermal electromagnetic radiation received from a spot on the object of measurement. These are significant devices in all their manifestations because they enable improvements in processes,maintenance, health and safety that save both lives as well as money. They are used widely in many manufacturing processes like metals, glass, cement, ceramics,semiconductors, plastics, paper,textiles, coatings and more.