3D Time-of-flight distance measurement with custom - Universität ...
3D Time-of-flight distance measurement with custom - Universität ...
3D Time-of-flight distance measurement with custom - Universität ...
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150 CHAPTER 5<br />
insensitive to edges or, generally speaking, to any spatial inhomogeniety imaged on<br />
one pixel. Such an optical structure is sketched in Figure 5.28.<br />
scene<br />
standard objective<br />
scene imaged<br />
on one pixel<br />
optical microstructure<br />
focused pixel illumination, distributed<br />
in two optically identical areas<br />
Figure 5.28 Microlens structure.<br />
Pixel<br />
imaged<br />
scene<br />
microlens<br />
array<br />
OptoASIC<br />
Like the 4-tap lock-in pixel (Section 5.1.2), the two-photosite demodulation pixel<br />
also contains four storage sites. But rather than accessing only one photosite from<br />
four sides, which leads to unsymmetrical sampling point sensitivity due to process<br />
inaccuracies, <strong>with</strong> this new pixel, two optically identical photosites are accessed<br />
from only two opposite sides. This two-side access is far less sensitive to process<br />
variations than the access from 4 sides. Also the photo site can be easily divided<br />
into several gates to accelerate photoelectrons and to achieve an efficient charge<br />
transfer.
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