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Active IR Sensor vs Passive IR Sensor-Difference between Active IR Sensor and Passive IR Sensor

This page compares Active IR(Infrared) Sensor vs Passive IR(Infrared) Sensor and mentions difference between Active IR sensor and Passive IR sensor types. They can not penetrate cloud, smoke, precipitation etc.

Both of these sensors operate at short wavelengths. Due to this, they have better resolution in detecting close objects.


Following table mentions similarities and difference between Active and passive infrared sensors.

Active IR(Infrared) Sensor Passive IR(Infrared) Sensor
These sensors are self illuminating type. These sensors are not self illuminating type.
They can directly measure range and velocity of targets. They have problems in measurement of these two parameters.
They can function effectively in day, dark and with cold target type. They can not function dark as well as with cold target.
These are intercepted and located easily by enemy detection system. These are not easily intercepted and located by enemy sensors.
They are small and light EM sensor. They are small and light EM sensor.
They are cheap. They are cheap.
Detection as well as measurements of targets are inferior to the radars. Detection as well as measurements of targets are inferior to the radars.

RADAR RELATED LINKS

RADAR tutorial   Doppler Radar   FMCW RADAR   RADAR BANDs   RADAR SCOPE   Weather Radar   Ground Penetrating Radar System   RADAR RANGE and RESOLUTION  


               

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