Active Sensor Vs Passive Sensor-Difference between Active Sensor,Passive Sensor

This page compares Active Sensor Vs Passive Sensor and mentions difference between Active Sensor and Passive Sensor types.

Definition: A sensor is a device which comprises of optical component or system and a detector with electronic circuits used to record reflected and/or emitted energy from various objects.

Active Sensor

active sensor

• Active sensor emits their own EM (Electromagnetic) energy which is transmitted towards the earth and receives energy reflected from the earth. The received EM energy is used for measurement purpose.
• Examples: communication satellite, earth observation satellite (e.g. RADARSAT-1), LISS-1 etc.
• Active sensors use their own source of energy for operation.
• Active sensors can obtain measurements anytime (Day & Night).

Passive Sensor

passive sensor

• Passive sensor receives naturally emitted EM energy within its field of view (FIV) and performs measurement using it.
• Examples: remote sensing satellite, SPOT-1, LANDSAT-1 etc.
• Passive sensors rely own other sources such as sun for its operation.
• Passive sensors obtain measurements only in day time.

Different types of Sensors Related links

Article on Sensors and Transducers>>
Proximity Sensor
Occupancy Sensor vs Motion Sensor
LVDT and RVDT sensor
Position, displacement and level sensor
force sensor and strain sensor
temperature sensor
pressure sensor
Humidity sensor
MEMS sensor
Touch sensor
Haptic sensor
Wireless sensor

Advantages and Disadvantages of other Sensor Types

Capacitive    Inductive    Photoelectric    Ultrasonic    Infrared    Motion    Biometric    Force    Humidity    Temperature    Light    Barometer    Sound    pH    Soil Moisture   

What is Difference between

difference between OFDM and OFDMA
Difference between SC-FDMA and OFDM
Difference between SISO and MIMO
Difference between TDD and FDD

RF and Wireless Terminologies