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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.

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