Figure

T

riangulation

P

osition

Detection

Circuitry

follo

wing

equations

are

used

to

determine

the

asymptotic

range 

where

top

and

bottom

are

the

corresp

onding

ampli ed

photo

dio

de

signals 

The

normalized

p

osition

of

the

imaged

sp

ot

on

the

photo

dio

de y

can

b

e

calculated

via

Eq 

The

distance r

can

then

b

e

computed

with

an

additional

scale

factor s 

the

baseline

distance

separating

the

detector

and

the

laser  

the

fo

cal

length

of

the

photo

dio

de

optics f

the

resulting

o

magni cation

factor m

and

the

angle

of

the

inciden

t

b

eam

to

the

photo

do

de s

lens

o

as

measured

from

the

baseline  

top

bottom

y

bottom

top