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 ...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
88 CHAPTER 4<br />
Required optical power <strong>of</strong> emitter Plight source:<br />
Aimage<br />
Ne<br />
⋅ ⋅ h ⋅ c<br />
Apix<br />
P light source =<br />
2<br />
Equation 4.7<br />
⎛ D ⎞<br />
ρ ⋅ ⎜ ⎟ ⋅ klens<br />
⋅ QE(<br />
λ)<br />
⋅ λ ⋅ Tint<br />
⎝ 2 ⋅ R ⎠<br />
Ne number <strong>of</strong> electrons per pixel<br />
Aimage image size in sensor plane<br />
Apix light sensitive area <strong>of</strong> pixel<br />
h Planck’s constant<br />
c speed <strong>of</strong> light<br />
ρ reflectivity <strong>of</strong> object<br />
D aperture <strong>of</strong> lens<br />
R <strong>distance</strong> <strong>of</strong> object<br />
klens losses <strong>of</strong> objective and filters<br />
QE(λ) quantum efficiency<br />
λ wavelength <strong>of</strong> light<br />
Tint integration time<br />
Figure 4.3 Reflectivity <strong>of</strong> concrete, blue cloth and vegetation and response <strong>of</strong><br />
human eye [HAM].<br />
This estimation assumes that the target is a Lambert reflector, i.e. the intensity<br />
distribution <strong>of</strong> back-scattered light does not depend on the illumination angle. The<br />
reflected intensity decreases <strong>with</strong> the cosine <strong>of</strong> the observation angle <strong>with</strong> respect
Change language