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1<br />
0<br />
2. DEVELOPMENT OF THE FABRY-PEROT DOPPLER IMAGING SYSTEM 29<br />
(a)<br />
10 photon spot<br />
0 threshold level<br />
C) thermal and readout<br />
noise level<br />
position in the image<br />
thresholding<br />
position in the image<br />
fringe<br />
integration<br />
position in the image<br />
2<br />
1<br />
0<br />
.N<br />
c<br />
a)<br />
c<br />
(b)<br />
position in the image<br />
thresholding<br />
position in the image<br />
integration<br />
position in the image<br />
Figure 2.8. Conceptual sketches of the thresholding and integration process: (a) normal<br />
photon spots and (b) photon spots which overlap each other because of an overexposure.<br />
In both sketches, top, middle and bottom panels show photon spot images thresholding<br />
images and fringe patterns obtained by the integration process, respectively.