Temperature sensors

Temperature sensors

Temperature sensors: device that measures heat generated from an
object or system. The device can detect changes in temperature.  
There are two metals in a thermostat that will close and open
 depending on the current temperature. An electrical 
current will flow to heat up or cool down the atmosphere. 
Infrared sensors detects infrared radiation/waves from a person or 
object.

Two types:
-contact sensors = need to have physical contact with a solid,liquid
or gas to work.
-non-contact sensors = measures energy radiated from an object.

Where can temperature sensors be used:
-refrigerator, to set a constant temperature by taking samples
-heating system uses a thermostat which keeps temperature at a 
consistent level.
-to control the television using infrared sensors, a signal is sent 
from the remote to the television to change the channel for example. 
-security systems to detect heat of a human
-used in astronomy to view objects of the universe
-monitor the heat of an airplane