Question

what is an optical detector?state its 3 essential characterstics .Name the factor which decides how good a detector is?

Answer 1

Hi mate.


Thanks for asking this question,


Here is your answer,



$optical \: dectors \: =$


A device whose change in state or response under the action of a flux of optical radiation is used to detect the radiation, to measure the radiation, or to record and analyze images of the radiating object. Optical detectors constitute the broadest class of radiation detectors. In an optical detector radiant energy in the optical range is converted into other forms of energy.





$important \: characteristics =$



(1)Receiver sensitivity

                  The receiver sensitivity is the minimum amount of optical power level that can be received by the detector. If the sensitivity is high that detector can receive signals of having low strength and itreduces the bit error rate. The sensitivity is decided by the material used to manufacture the detector.


(2) The detector must have thecharacteristic of receiving optical signal as it is. 


(3) detector should have the capability of generate the optical signal into electrical signal without destroying characteristic of the signal.






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