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il rilievo laser scanner - Circe

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STIMA DIRETTA DEL TEMPO DI VOLO (PW)<br />

Laser<br />

Tx Power<br />

t<br />

Detector<br />

d=c(Δt)/2<br />

Beam splitter<br />

t 0<br />

t 0 +Δt<br />

t<br />

• Δt=2d/c ; c=3·10 8 m/s<br />

• quindi prendendo ad esempio d=1 m si ha:<br />

Δt=6.67 ns<br />

28<br />

Tx pulse<br />

Rx pulse<br />

• La luce percorre 1 mm ogni 3.3ps (3.3 10 -12 s)

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