YOKOGAWA FB200 Bedienungsanleitung
User’s
Manual
Yokogawa Electric Corporation
FB200
FBG Sensor Monitor
IM 703753-01E
1st Edition
i
IM 703753-01E
1st Edition: April 2004 (YK)
All Rights Reserved, Copyright © 2004 Yokogawa Electric Corporation
Foreword
Thank you for purchasing the FB200C/FB200L FBG Sensor Monitor.
This user’s manual contains useful information about the instrument’s functions and
operating procedures and lists the handling precautions of the FB200C/FB200L. To
ensure correct use, please read this manual thoroughly before operation.
After reading the manual, keep it in a convenient location for quick reference whenever a
question arises during operation.
Note
•The contents of this manual are subject to change without prior notice as a result of
continuing improvements to the instrument’s performance and functions.
•Every effort has been made in the preparation of this manual to ensure the accuracy
of its contents. However, should you have any questions or find any errors, please
contact your nearest YOKOGAWA dealer.
•Copying or reproducing all or any part of the contents of this manual without the
permission of Yokogawa Electric Corporation is strictly prohibited.
• This product’s warranty is limited to its performance and functions. Yokogawa shall
not be responsible for any loss, damage, costs or expenses which may be incurred by
the user in the rare event that the instrument malfunctions. Make sure to consider the
effects of the instrument on your current system and be aware of any remedial
measures that may need to be taken before using the instrument with your system.
Trademarks
• Adobe and Acrobat are trademarks of Adobe Systems incorporated.
• For purposes of this manual, the TM and symbols do not accompany their
respective trademark names or registered trademark names.
• Other company and product names are trademarks or registered trademarks of their
respective companies.
Revisions
•1st edition April, 2004
ii IM 703753-01E
Checking the Contents of the Package
Unpack the box and check the contents before operating the instrument. If some of the
contents are not correct, or if any items are missing or damaged, contact the dealer from
whom you purchased them.
703753
Check that the model name and suffix code given on the name plate on the front panel
match those on your order.
MODEL
NO.
SUFFIX
Made in Japan
MODEL
NO.
SUFFIX
Made in Japan
Model Suffix Code Description
703753 FBG Sensor Monitor
-D1 Standard specifications
-CN1 Optical connector (FC) type
-W1 Wavelength range 1 (1527 to 1567 nm) FB200C C band
-CN2 Wavelength range 2 (1568 to 1607 nm) FB200L L band
Options /IMJ User’s manual (Japanese)
/IME User’s manual (English)
/IM0 No user’s manual
/DSJ Inspection report (Japanese)
/DSE Inspection report (English)
/DS0 No inspection report
•NO. (Instrument Number)
When contacting the dealer from which you purchased the instrument, please give
them the instrument number.
iii
IM 703753-01E
Safety Precautions
The following general safety precautions must be observed during all phases of
operation. If the instrument is used in a manner not specified in this manual, the
protection provided by the instrument may be impaired. Yokogawa Electric Corporation
assumes no liability for the customer’s failure to comply with these requirements.
The following symbols are used on this instrument.
Danger. Refer to the user’s manual.
This symbol appears on dangerous locations on
the instrument which require special instructions for proper handling or use. The same
symbol appears in the corresponding place in the manual to identify those instructions.
Make sure to observe with the precautions below. Not complying might result in
injury or death.
WARNING
•Power supply
Ensure that the source voltage matches the voltage of the power
supply before supplying the power. Use a power supply that conforms
to the IEC60950 standard.
•Connect the Protective Grounding Terminal
If you are using the 703781 Power Supply Unit with the FB200C/
FB200L, be sure to employ protective earth ground by connecting a
power cord with a three-prong plug (with an earth pin) to a properly
grounded three-pin outlet.
•Do Not Operate with Defective Protective Grounding or Fuse
Do not operate the instrument when the protective grounding or fuse of
the instrument or the connected device might be defective. Make sure
to check them before operation.
•Do Not Look at the Laser Light
Do not look at the laser’s direct light, reflected light from a mirror, or
indirect light without the proper protective eyewear. In addition, avoid
being exposed to the laser light. It can cause blindness or damage to
the eye.
When using a laser light source, always check the precautions given in
the user’s manual for the laser and handle it with extra care.
•Do Not Operate in an Explosive Atmosphere
Do not operate the instrument in the presence of flammable liquids or
vapors. Operation in such environments constitutes a safety hazard.
•Do Not Remove Covers
The cover should be removed by ANDO’s qualified personnel only. If
you remove the cover, the instrument may break or its performance
may deteriorate.
iv IM 703753-01E
How to Use This Manual
Structure of This Manual
This user’s manual consists of the following sections.
Chapter Title
Description
1Explanation of Functions
Describes the measurement principles and the functions of the instrument. Operational
details are not given in this chapter. However, reading this chapter will help you understand
the operating procedures given in the chapters that follow.
2 Installation Procedure
Describes the handling precautions, connection procedures, installation conditions, and
operating environment.
3Operating Procedure
Describes how to set measurement conditions and how to operate the instrument including
topics such as how to set the mode switch, how to use the control commands, the output
format, and how to control the instrument from your PC. For errors that occur during
measurements, see the troubleshooting and maintenance sections in the next chapter
4Troubleshooting and Maintenance
Describes the probable causes of errors and how to resolve them. Describes maintenance
work.
An error code list of measurement signals are also provided.
5Specifications
Lists the specifications of the instrument, the operating environment, and other information in
tables.
6Sample Program
Provides a basic program example used to determine two peaks.
Index and Terminology
Conventions Used in This Manual
•Unit
k: Denotes 1000. Example: 9.6 kbps
•Safety Markings
The following marking is used in this manual.
Improper handling or use can lead to injury to the user or damage to
the instrument.
This symbol appears on the instrument to indicate
that the user must refer to the user’s manual for special instructions.
The same symbol appears in the corresponding place in the user’s
manual to identify those instructions. In the manual, the symbol is
used in conjunction with the word “WARNING” or “CAUTION.”
WARNING Calls attention to actions or conditions that could cause serious or
fatal injury to the user, and precautions that can be taken to prevent
such occurrences.
CAUTION Calls attentions to actions or conditions that could cause light injury
to the user or damage to the instrument or user’s data, and
precautions that can be taken to prevent such occurrences.
Note
Calls attention to informor proper operation of the instrument.
v
IM 703753-01E
1
2
3
4
5
6
Index
Contents
Checking the Contents of the Package ...........................................................................................ii
Safety Precautions ......................................................................................................................... iii
How to Use This Manual ................................................................................................................ iv
Chapter 1 Explanation of Functions
1.1 Block Diagram and Configuration Diagram ...................................................................... 1-1
1.2 Measurement Method ...................................................................................................... 1-2
1.3 Names and Functions of Parts ......................................................................................... 1-4
Chapter 2 Installation Procedure
2.1 Operating Precautions ..................................................................................................... 2-1
2.2 Connecting the Interface Connector ................................................................................ 2-2
2.3 Installing the Instrument ................................................................................................... 2-3
Chapter 3 Operating Procedure
3.1 Setting the Mode Switch .................................................................................................. 3-1
3.2 Commands ....................................................................................................................... 3-2
3.3 Output Format .................................................................................................................. 3-6
3.4 Using the FB200C/FB200L through a PC ........................................................................ 3-7
Chapter 4 Troubleshooting and Maintenance
4.1 Troubleshooting ............................................................................................................... 4-1
4.2 Error Codes ...................................................................................................................... 4-2
4.3 Maintenance .................................................................................................................... 4-4
Chapter 5 Specifications
5.1 Basic Specifications .........................................................................................................5-1
5.2 General Specifications ..................................................................................................... 5-2
5.3 Environmental Conditions ................................................................................................ 5-3
5.4 External Dimensions ........................................................................................................ 5-4
Chapter 6 Sample Program
6.1 Terminal Mode Settings ................................................................................................... 6-1
6.2 Program Setup ................................................................................................................. 6-2
Index and Terminology
Index .................................................................................................................................. Index-1
Terminology .......................................................................................................................... Index-3
1-1
IM 703753-01E
Explanation of Functions
1
Chapter 1 Explanation of Functions
1.1 Block Diagram and Configuration Diagram
The block diagram of the optical system is shown below. The optical system employs a
polychromator system consisting of a fixed grating and a photodiode array (PDA sensor).
Because the reflection spectrum of FBG can be detected using an optical system with its fixed
elements (component parts), it is ideal for applications that demand high reliability.
The principles of spectroscopy are described below. The light input from the FC connector is
collimated by the lenses and hits the fixed grating. Here the reflection spectrum of FBG is
dispersed and divided into each wavelength of light. Then, the light is focused on the
photodiode array by the lens. This focal point is detected by scanning the InGaAs photodiode
array (consisting of 640 photodiode elements). The optical system is fixed in place (welded if
necessary) to endure vibration and shock, and to minimize deterioration with age.
Photodiode array
Mirror
Shutter
Fixed
grating
Signal processing
and
communication section
Input fiber
(FC/PC connector)
Depolarizer
The configuration diagram is shown below. The reflection spectrum of FBG that is detected
by the optical system (shown above) is I/V converted, A/D converted, and processed using a
digital signal processor (DSP) to derive the center wavelength and optical power level of
each reflection spectrum of FBG. In addition, in order to determine the optical power level in
a stable manner, the photodiode array is maintained at a constant temperature.
Shutter motor
Motor Driver To Host
RS-422
DSP
DSP controller
Wavelength computation,
power computation, etc.
Filter
A/D
Up to
16 bits
Photodiode array
module
Temperature
control
Photodiode array
module timing
control
Serial
interface
Thermoelectric
cooler
Photodiode
array
(640 cells)
Temperature
sensor
I/V
AMP
1
10
1-2 IM 703753-01E
1.2 Measurement Method
In the measurement of strain, temperature, and other items using the FBG sensor, strain,
temperature, and other items can be derived by measuring the reflection spectrum from
the grating area that forms in the optical fiber. The FBG wavelength monitor is a useful
instrument for measuring the wavelength.
This section describes how the optical wavelength and optical power level are measured
using the FBG Sensor Monitor. The center wavelength and its optical power level is
calculated from the power distribution of the optical signal obtained by multiple PD
elements and the wavelength that is pre-assigned to each PD element.
You can set appropriate measurement conditions by changing parameters such as the
average count, threshold value, and offset value. Furthermore, the optical wavelength
and optical power level are calibrated before the instrument is shipped from the factory.
Commands are also provided to compensate the results of these measurements if such
compensation is necessary after the instrument is installed in the system.
Computed result of center wavelength
Reflection spectrum of FBG
Optical wavelength
Device output
Optical power
1-3
IM 703753-01E
Explanation of Functions
1
Because the FB200C/FB200L uses a polychromator system with no moving parts, high-
speed stable measurement is possible.
The basic measurement sequence is shown below (examples for –5 dBm and –15 dBm
ranges).
•When Averaging Is Not Performed
The measurement interval is determined by the selected interval. (The default value
is 10 ms.)
However, if the wavelength calculation and processing take longer than the
measurement interval, the resultant data are output when they are ready. (Example
when the number of FBG spectra is 10 and the baud rate is 921.6 kbps)
PDA sensor start
trigger
Wavelength
computation, etc.
Approx.
7 ms
Data transmission/
communication
Scan the PDA sensor
Retrieve the A/D data
Approx.
7 ms
Approx.
2 ms
Data acquisition
time
Specified interval
Reference
•When Averaging n Times
If the wavelength calculation and processing take longer than the measurement
interval, the resultant data are output when they are ready.
PDA sensor start
trigger
Wavelength
computation, etc.
Approx. 7 ms
Data transmission/
communication
Scan the PDA sensor
Retrieve the A/D data
Approx.
7 ms
Approx.
2 ms
1st
time
2nd
time
nth
time
1st
time
2nd
time
nth
time
1st
time
2nd
time
nth
time
Reference
1.2 Measurement Method
1-4 IM 703753-01E
1.3 Names and Functions of Parts
The figure below shows the outline and the arrangement of parts such as the optical
input, interface connector, and mode switch.
•Mode Switch
The mode switch is located inside the side panel cover. You can set the operation
mode, transfer rate, and other parameters by using these switches.
•Interface Connector
The interface connector consists of the communication interface and power supply
interface. The communication interface is the RS-422.
•Optical Input
The fiber light is applied here. The optical connector is of an FC type (standard), and
the fiber supports the SMF (Single Mode Fiber).
•Holes for Attachment Screws
These holes are used to attach the FB200C/FB200L in the system.
Mode switch Optical input
Interface connector
Holes for M3 attachment screws (6 locations)
87654321
ON
Mode switch
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