Figure

The

Softb

oard

from

Micro eld

Graphics

Metho

ds

of

Range nding

T

riangulation

The

most

common

laser

range nders 

triangulation

devices 

come

in

t

w

o

v

arieties 

The

 rst

emplo

ys

a

single

sensor 

These

devices

optically

image

 via

a

lens 

on

to

a

p

osition sensitiv

e

photo

dio

de

or

an

imaging

arra

y

With

ev

ery

c

hange

in

range 

there

is

an

asso

ciated

c

hange

in

the

inciden

t

angle 

hence

imaged

p

osition

of

the

re ected

b

eam 

This

tec

hnique

is

commonly

used

in

optical

pro

ximit

y

sensors CG     

This

measuremen

t

is

nonlinear 

asymptotic

with

distance 

These

devices

are

often

used

for

pro ling

surfaces PTR

and

t

ypically

ha

v

e

short

activ

e

ranges 

w

ell

suited

to

capturing

 D

surfaces

for

computer

graphics

applications 

A

compact

device

can

b

e

constructed

for

a

reasonable

cost 

but

it

will

not

meet

the

required

accuracy

sp

ec