Thermopiles are mainly used for contactless temperature measurement in many applications. Their function is to transfer the heat radiation emitted from the objects into voltage output. Major applications are appliances like microwave oven, cloth dryer, automatic cooker, medical devices like ear and fore head thermometer, automotive applications like car climate control, seat occupancy, blind spot alert, black ice detection, consumer products like printer, copier, mobile phone and many industry applications like paper web, plastic parts etc
 
DS18B20 Digital Temperature Sensor / Thermometer 
Temperature range: -55°C to +125°C
Designed for : -10°C to +85°C (+- 0.5°C)
Unique 1-Wire Interface Requires Only One Port Pin for Communication
Programmable Resolution from 9 Bits to 12 Bits
TO-92 Package