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Alfredo Dubra's PhD thesis - Imperial College London

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3. Data processing<br />

mk1/46<br />

(a)<br />

(b)<br />

st3/15<br />

(c)<br />

(d)<br />

im4/17<br />

(e)<br />

(f)<br />

pb2/92<br />

(g)<br />

(h)<br />

Figure 3.1: Estimation of the interferogram modulation carrier frequency intensity<br />

modulation (left) from spectra (right). The frequencies between the red lines indicate<br />

the area where we expect to have only the DC term. In the top row, we see a normal<br />

smooth front tear surface, the second row shows a rough surface typical after blink, in<br />

the third small bubbles on the tear surface can be noticed and at the bottom a clear<br />

bump in the tear formed by the one of the eyelids is shown.<br />

45

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