0.7

Hand over

0.5

"Smart Table"

Y(m)

0.3

0.1

Scanner at (0,0)

0

0.2

0.4

0.6

0.8

X (m)

Figure

Dra

wing

in

the

air 

ab

o

v

e

a

Smart

T

abletop 

with

the

T

riangulation

Range nder

con

tin

uous w

a

v

e

device

allo

ws

for

a

measuremen

t

linear

in

r

This

is

imp

ortan

t

in

measuring

long

distances 

allo

wing

the

device

to

return

a

linear

measuremen

t

with

the

dynamic

range

ev

enly

distributed

ab

out

the

activ

e

area 

The

con

tin

uous w

a

v

e

device

measures

range

b

y

detecting

the

phase

slip

of

an

amplitude

mo

dulated

laser

b

eam 

The

phase

slip

can

b

e

measured

b

y

a

phase

detector

or

b

y

quadrature

detec 

tion 

Quadrature

detection

allo

ws

one

to

disregard

an

y

phase

loss

in

the

circuit

b

y

calibrating

the

range

after

it

is

setup 

In

b

oth

cases 

to

a

v

oid

phase wrap

and

range

am

biguit

y

the

measuring

range

m

ust

not

exceed

one

half

w

a

v

elength

of

the

mo

du 

lated

b

eam

 accoun

ting

for

the

return

path

as

w

ell  

Th

us

the

farthest

distance

that

one

can

unam

biguously

measure

here

is

one

half

w

a

v

elength 

W

e

c

hose

a

mo

dulation

oscillator

frequency   MHz 

appropriately

suc

h

that

the

allo

w

ed

range

of

phase

is

within

a

reasonable

amoun

t

of

the

distance

w

e

w

ould

lik

e

to

measure 

This

pro

duces