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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Geology (GG)
What is sensor and scanner
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Rahul kumar
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Scanner is a device for examining, reading, or monitoring something, in particular. More simply, scanner is a device that scans and converts the information into digital data. Two simple type of scanners used in remote sensing are whiskbroom and pushbroom scanner. Sensor is a device that gathers EMR energy, converts into signal and present it in a form (image) suitable for obtaining information about the object under investigation. Sensors collect data recorded by sensor by detecting the energy that is reflected from Earth. These sensors can be on satellites or mounted on aircraft. Remote sensors can be either passive or active. Active sensors have its own source of light or illumination and actively sends a pulse and measures the backscatter reflected back to the sensor. Whereas passive sensors measure reflected sunlight emitted from the sun. When the sun shines, passive sensors measure this energy.
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Sajan sarthak
A sensor is a device that measures a physical quantity - photons, molecular movement (temperature), magnetic fields, electric current ... A scanner is a sensor coupled with an emitter for the physical phenomenon to measure. Since the environment will change the emitted signal, that change can be used to make assumptions about the environment. Depending on the variety of scanner signals and computational power, these assumptions can get arbitrary close to reality. A sensor scan refers to to the ability of some sensors to sense for an adjustable smaller range (usually photon frequencies). Changing the range continuously (for example from infrared to ultraviolet for "visible" light, or from 89.0 MHz to 104 MHz for radio broadcasting), is called scanning, too.