Question

The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface, are called

Answer 1

The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface, are called active sensor.
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Answer 2

The correct answer is Active Sensors.

• Active sensors create their own electromagnetic energy that is transmitted towards the terrain, interacts with the terrain producing a backscatter of energy, and is recorded by the remote sensor's receiver.
• An active sensor is a transducer that generates electric current or voltage directly in response to environmental stimulation.
• Active sensors both transmit and measure electromagnetic energy.
• Active sensor self-destructs during hijack attempts.
• Active sensor actively transmits the measurement to ground stations whether the personnel on duty want the data or not.
• The active sensor emits its own EM energy which is transmitted towards the earth and receives energy reflected from the earth. The received EM(electromagnetic) energy is used for measurement purposes.
• It provides its own energy source for illumination.
• Active sensors are able to obtain measurements anytime.
• Examples of active sensors like communication satellites, earth observation satellites, LISS -1, etc.

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