Phototransistor

25 Mhz Quadrature

Rotating Mirror

Clock Generator

5 mW laser diode

hitachi

Q

I

100% Chop

SH 1

TTL In (synch)

7032

Y

Serial Link

PIN, APD

Low Pass

to host

x

A/D

X * Y

Photodiode

Computer

Finds amplitude

In

X

MPY600

peaks and

sends peak

Y

parameters

Dual

Low Pass

x

A/D

MAR 1

X * Y

X

In

MPY600

MAX436

Dual AD603

Tuned Amplifier

AGC

Figure

Blo

c

k

Diagram

of

CW

Phase Measuring

Range nder

the

follo

wing

w

a

v

elength 

m

 x  

c

s

u

  m

f

  M

hz

This

u

meters

th

us

allo

ws

us

to

measure

up

to

meters

a

w

a

y

from

the

range nder 

w

ell

suited

to

the

pro

jection

surfaces

that

w

ere

in

tended 

It

is

p

ossi 

ble

to

easily

c

hange

the

oscillator

frequency

along

with

the

demo

dulation

 lter

cuto 

and

thereb

y

c

hange

the

measuremen

t

range

of

the

range nder

for

other

applications 

The

range nder

w

as

constructed

mo

dularly

As

with

the

earlier

triangulation

range nder 

the

laser

and

receiv

e

optics

and

electronics

w

ere

all

in

one

unit 

The

demo

dulator

w

as

in

a

separated

rac

k

unit

along

with

the

micro

con

troller

in

terface 

As

the

op

erating

frequency

of

the

phase

system

increased

b

y

t

w

o

orders

of

magnitude

b

ey

ond

the

triangulation

unit 

man

y

of

the

comp

onen

ts

w

ere

upgraded

to

re ect

that

c

hange 

This

device

w

as

built

and

satis ed

our

criterion

for

suc

h

a

system 

A

blo

c

k

diagram

is

sho

wn

in

Fig 

and

describ

ed

b

elo

w 

Sc

hematics

of

the

system

are

giv

en

in

App

endix

A