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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POWER BUDGET AND RESOLUTION LIMITS 95<br />
Power in femtowatts<br />
18000<br />
16000<br />
14000<br />
12000<br />
10000<br />
8000<br />
6000<br />
4000<br />
2000<br />
0<br />
rho=0.2<br />
rho=0.4<br />
rho=0.6<br />
rho=0.8<br />
rho=1.0<br />
1 2 3 4 5 6 7 8<br />
Distance in meters<br />
900000<br />
800000<br />
700000<br />
600000<br />
500000<br />
400000<br />
300000<br />
200000<br />
100000<br />
Figure 4.4 Received optical power per pixel and corresponding number <strong>of</strong><br />
generated electrons per pixel versus target <strong>distance</strong> R and<br />
reflectivity ρ.<br />
Light source: 700 mW, 50° beam divergence, pixel size: 12.5 x 14.5 µm 2 ,<br />
wavelength: 630 nm, quantum efficiency 65%, integration time Tint=25 ms, klens:<br />
0.35, lens aperture: 2.6 mm.<br />
Range accuracy (std) in cm<br />
20.0<br />
18.0<br />
16.0<br />
14.0<br />
12.0<br />
10.0<br />
8.0<br />
6.0<br />
4.0<br />
2.0<br />
0.0<br />
rho=0.2<br />
rho=0.4<br />
rho=0.6<br />
rho=0.8<br />
rho=1.0<br />
1 2 3 4 5 6 7<br />
Distance in meters<br />
Figure 4.5 Range accuracy ∆L versus target reflectivity ρ and <strong>distance</strong> R<br />
according to Equation 4.17.<br />
Demodulation contrast Cdemod=40%; noise-equivalent number <strong>of</strong> noise electrons<br />
Npseudo = 30,000; additional background = 0; non-ambiguous <strong>distance</strong> range<br />
L = 7.5 m (fmod=20 MHz); all other conditions as for Figure 4.4.<br />
0<br />
Number <strong>of</strong> electrons
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