Industrial Fiber Optics IF 511 Manual de usuario

Laser Audio Transmission

Project

Experiment & Product Guide

IF 511 and IF 512

INDUSTRIAL FIBER OPTICS

Previous Printings 2000, 2003, 2006

by Industrial Fiber Optics, Inc.

Revision - C

Printed in the United States of America

* * *

a retrieval system, or transmitted in any form or by any means (electronic,

mechanical, photocopying, recording, or otherwise) without prior written

permission from Industrial Fiber Optics, Inc.

* * * * *

- i -

Introduction

This manual provides information about Industrial Fiber Optics' Laser Audio

Transmission Project. The project can be purchased with either a Helium Neon

(HeNe) laser, IF HN08M (P/N IF 511), or a Semiconductor Diode laser, IF RL08-635

(P/N IF 512), as the laser light transmission source. The manual contains all the

information you need for both lasers to complete this project safely and

knowledgeably, even if you are a novice to this technology. Please read the manual

carefully while completing activities.

As soon as you receive the Laser Audio Transmission Project, inspect it and the

shipping container for damage. If any damage is found, immediately refer to the

section of this manual entitled "Shipment Damage Claims". Then check the contents

against the appropriate kit listed in Table 1.

Industrial Fiber Optics makes every effort to incorporate state-of-the-art

technology, highest quality and dependability in its products. We constantly explore

new ideas and products to best serve the rapidly expanding needs of industry and

education. We encourage comments that you may have about our products, and we

welcome the opportunity to discuss new ideas that may better serve your needs. For

more information about our company and products refer to http//www.i-

fiberoptics.com on the Worldwide Web.

Thank you for selecting this Industrial Fiber Optics product. We hope it meets

your expectations and provides many hours of productive activity.

Sincerely,

The Staff at Industrial Fiber Optics

- ii -

- iii -

TABLE OF CONTENTS

Introduction

.................................................................................... i

LASER CLASSIFICATIONS ..................................................... iv

PROJECT KIT COMPONENTS ................................................ 1

LIGHT for COMMUNICATION.................................................. 2

ACTIVITIES

HeNe Procedure..................................................................... 3

Diode laser Procedure ............................................................ 5

Fiber Optic Procedure ............................................................. 7

TROUBLESHOOTING............................................................... 8

SERVICE AND MAINTENANCE ............................................. 9

WARRANTY .............................................................................. 10

SHIPMENT DAMAGE CLAIMS ................................................ 11

- iv -

LASER CLASSIFICATIONS

All manufacturers of lasers used in the United States must conform to regulations

administered by the Center for Devices and Radiological Health (CDRH), a branch of the U.S.

Department of Health and Human Services. CDRH categorizes lasers as follows:

Class

Description

I A laser or laser system which does not present a hazard to skin or eyes

for any wavelength or exposure time. Exposure varies with wavelength.

For ultraviolet, .2 to .4 !m exposure is less than from .8 nW to .8 !W.

Visible light exposure varies from .4 !W to 200 !W, and for near IR, the

exposure is < 200 !W. Consult CDRH regulations for specific

information.

II Any visible laser with an output less than 1 mW of power. Warning label

requirements — yellow caution label stating maximum output of 1 mW.

Generally used as classroom lab lasers, supermarket scanners and

laser pointers.

IIIa Any visible laser with an output over 1 mW of power with a maximum

output of 5 mW of power. Warning label requirements — red danger label

stating maximum output of 5 mW. Also used as classroom lab lasers, in

holography, laser pointers, leveling instruments, measuring devices and

alignment equipment.

IIIb Any laser with an output over 5 mW of power with a maximum output of

500 mW of power and all invisible lasers with an output up to 400 mW.

Warning label requirements — red danger label stating maximum output.

These lasers also require a key switch for operation and a 3.5-second

delay when the laser is turned on. Used in many of the same applications

as the Class IIIa when more power is required.

IV Any laser with an output over 500 mW of power. Warning label

requirements — red danger label stating maximum output. These lasers

are primarily used in industrial applications such as tooling, machining,

cutting and welding. Most medical laser applications also require these

high-powered lasers.

- 1 -

Project Kit Components

Table 1 lists all components included in both models of the Laser Audio

Transmission Kit. Before proceeding to activities, identify each component listed in the

table below for the appropriate kit number.

Table 1. P roje ct kits com ponen t lis t.

General Description P/N

IF 511

P/N

IF 512 Quantity

Laser Audio Receiver IF 513 IF 513 1

Helium Neon (HeNe)

Laser

IF HN08M 1

Diode Laser IF RL08-635 1

Microphone 57 0022 57 0022 1

Plastic Optical Fiber IF C E1000 IF C E1000 3 meters

After inspecting your kit for the correct contents you can proceed to set up a

voice transmission project. Go to page 3 if you have the helium neon laser project and

to page 5 if you have the semiconductor laser project.

T abl e 2. C o mm on ab bre vi ati on s us ed i n t his m an ua l.

Abbr. Long version Scientific Notation

mW milliwatts 1 x 10-3 watts

!W microwatts 1 x 10-6 watts

nW nanowatts 1 x 10-9 watts

mm millimeters 1 x 10-3 meters

!m micrometers 1 x 10-6 meters

nm nanometers 1 x 10-9 meters

- 2 -

Light as Communication

Light is usually thought of as a modern means of communication, be it line of

sight directly from source to receiver or through a medium such as a fiber optic cable.

However, light has been used to provide communications since ancient times.

One of the earliest recorded uses of light for communications comes from the

ancient city of Alexandria. One of the 7 wonders of the ancient world was the Pharos

Lighthouse constructed around 290 BC. This impressive structure towered over the

city and provided guidance for sailors at sea as far as 35 miles. It used a mirror to

reflect sunlight during the day and bonfires at night to guide ships to the harbor.

Moving forward historically, the advent of modern communications with light

can be said to have started with Alexander Graham Bell. In addition to the telephone

this prolific inventor created what he called the photophone. Utilizing sunlight

reflected from mirrors Mr. Bell generated the worlds first wireless telephone call on

June 3, 1880. He considered this an even greater invention than the telephone, and

the ever growing field of fiber optic communications pays tribute to his belief that light

was the communication method of the future.

- 3 -

HeNe Laser Procedure

Equipment Needed:

• HeNe Laser ; IFO part number IF HN08

• 120-VAC to 12-VDC powe adapters (2)

• Microphone; IFO part number 57 0022

• Laser Audio Receiver; IFO part number IF 513

Procedure:

1. Choose a flat, level surface about 60 x 120 cm (2 x 4 feet) in size.

2. Collect all the items listed in the “EQUIPMENT NEEDED” section above.

3. Review the Rules for Laser Safety listed on the back cover of this booklet.

4. For detailed information regarding the operation of the helium neon laser refer

to its operating manual.

5. Position the laser and the receiver as shown in Figure 1.

6. Push the laser shutter’s handle downward to its closed position.

7. Make sure the laser's ON/OFF switch (SW) is in its OFF position. (The push

button should be in its extended position.)

audio

receiver

laser

Figure 1. Side vie w of th e lase r an d audio re ceiver.

8. Plug the VAC-to-DC laser power adapter into an AC electrical outlet.

9. Plug the cord from the power adapter into the power jack (PWR) located on

the rear of the laser.

10. Plug the VAC-to-DC audio receiver power adapter into an AC electrical outlet.

11. Plug the cord from the power adapter into the power jack located on the front

of the audio receiver.

12. Plug the microphone into the 3.5 mm audio jack on the back of the laser.

- 4 -

13. Depress the ON/OFF switch (SW) on the control panel of the laser until it

clicks into the ON position. (The switch should be slightly depressed.) The

pilot light (green LED) on the laser should now be lit, showing that it is on.

14. Open the laser shutter.

15. Dim the room lights to help you observe the laser

beam. Position the receiver in line with the laser

so the beam strikes the audio receiver close to

the photodetector access hole. Manually align

the beam with the optical input (photo diode) of

the audio receiver.

16. Turn on the microphone using the switch located

on the side.

17. Turn the ON/OFF volume knob on the audio

receiver to the 12 o’clock position. The pilot light

(yellow LED) on the audio receiver should now be lit, showing that it is on.

18. Speak into the microphone and listen for your voice to come out of the audio

receiver. If you do not hear your voice on the first attempt, continue to speak

into the microphone while turning up the volume control clockwise on the

audio receiver. If you reach maximum volume and still do not hear your voice,

realign the laser beam with the audio receiver while speaking into the

microphone.

19. When you have the audio receiver and the laser properly aligned you should

easily hear your voice from the receiver when you speak into the microphone.

20. If you continue to have problems at this point refer to the

“TROUBLESHOOTING” section in the back of the manual. If you have

successfully established an audio link using the laser continue with your

experiment.

21. Upon completing the experiment close the laser beam shutter. At this time

you can either continue to the Fiber Optic Transmission procedure on page 7

or switch off the laser and complete the remaining steps below.

22. Turn the volume knob on the audio receiver to the OFF position.

23. Turn off the microphone.

24. Unplug the power adapters from the electrical outlets, the laser and the audio

receiver.

25. Remove all equipment from the table and store in their proper locations.

Direct Laser Beam

through hole and

onto detector

1515.eps

Figu re 2. Clos e up

view of the

ali gn m en t la se r

beam to rece iver

ap ert u re.

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