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Optics for Engineers
book

Optics for Engineers

by Charles A. DiMarzio
August 2011
Intermediate to advanced content levelIntermediate to advanced
564 pages
20h 45m
English
CRC Press
Content preview from Optics for Engineers
416 OPTICS FOR ENGINEERS
13.2.1 Mean and Standard Deviation
We will consider a light source that we would think of as “constant” in the classical sense, with
apower,P. If we consider a very short time interval, dt, there are only two possibilities. First
there is a small probability that a photon will be detected. We assume that this probability is
Independent of time (the source is constant)
Independent of previous photon detections
Proportional to the source power
Proportional to the duration of the interval, dt
Therefore, we call this probability α dt where α is a constant. The only other possible result
is that no photon is detected. The
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Publisher Resources

ISBN: 9781439807255