Primes FocusMonitor-W User manual

Short Start Guide
Revision 02/2016 EN
PRIMES
FocusMonitor-W
FM-W
Additional Documentation to the Operating Manual
FocusMonitor/BeamMonitor
Translation of the Original Instructions

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Contents
1 ABOUT THIS DOCUMENTATION 4
2 DISTINGUISHING FEATURES IN COMPARISON WITH THE STANDARD DEVICE 4
3 CONNECTIONS 4
4 DISPLAYS 5
5 ADAPT DEVICE 5
6 INFORMATION ON THE OPERATION OF THE ABSORBER 5
7 MOUNTING/DISMOUNTING 6
7.1 Inserting/Exchanging the Measuring Tip..................................................................................6
7.1 Exchanging the Detector..........................................................................................................8
7.2 Setting the Measurement Sensitivity of the Detect ................................................................11
7.3 Installation Position ................................................................................................................11
7.4 Alignment ...............................................................................................................................11
8 BASIC SETTINGS OF THE LASERDIAGNOSTICSSOFTWARE (LDS) 12
8.1 Measuring Environment .........................................................................................................12
8.2 Sensor parameters.................................................................................................................12
8.3 Beamfind Settings..................................................................................................................13
9 MEASURING 14
9.1 Manual Caustic Measurement ...............................................................................................14
9.2 Caustic Display ......................................................................................................................16
10 TECHNICAL DATA 17
11 DIMENSIONS 18

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1 About this Documentation
This documentation describes the special version „FocusMonitor-W“ of the PRIMES measuring de-
vice “FocusMonitor” and presents the differences. It supplements the standard operating manual of the
FocusMonitor.
IMPORTANT
Please pay special attention to the safety instructions given in the standard operating manual of
the FocusMonitor.
2 Distinguishing Features in Comparison with the Standard Device
• The FocusMonitor-W does not have an integrated z-axis. For the measurement the focus is moved along
the axis by the system. Information regarding the z-position can either be entered manually via the set-
tings dialogue (measurement >> single measurement) in the LaserDiagnosticsSoftware or loaded from
a settings file.
• An absorber is integrated in the measuring device (power, max. 1000 Watts)
• The maximum energy per measurement is 90 kJ (max. irradiation time=90 s at 1000 Watt)
• The measuring device does not have a protective gas connection
• Direct connection to the PC via RS232 interface
3 Connections
RS 232
24 V
Offset: 10,6 mm
Power
Data
Send
Trigger
x+
-
+
yFM-W
FocusMonitor-W
LED-Display
RS232 Bus
Power Supply Connection
Fig. 3.1: Connections of the FMW

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4 Displays
Designation Color Meaning
Power Red Voltage (24 V)
Data Green Devices send data on the bus
Send Red PC sends data on the bus
Trigger Yellow Trigger signal (only for maintenance purposes)
5 Adapt Device
Depending on the laser type the corresponding measuring tip and a suitable detector have to be used. The
NIR detector is included ex works; the measuring tip has to be mounted by the customer.
CO2Laser YAG Laser
Detector Pyro detector, 2 measurement ranges NIR Detector, 2 Ranges
Measuring Tip HP-CO2HighDivYAG
Tab. 5.1: Variety of measurement tips and detectors
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For the CO2laser measuremen the current FMW works with both the DFCL- and the new DFCM
detector (from November 2011). This requires a selection of the respective detector type in the
sensor parameter window of the LaserDiagnosticsSoftware.
6 Information on the Operation of the Absorber
The high power absorber can absorb up to 90 kJ (1000 W · 90 s).
NOTICE
Danger of damage due to overheating
The absorber is equipped with an alarm which signals overheating. It goes off as soon as
the housing of the absorber reaches a temperature of 60 °C.
In case of an alarm, the laser has to be turned off immediately to ensure the absorber can
cool down!
NOTICE
Danger of burning
Due to the laser beam the surface of the absorber can become very hot.
The absorber must not be touched during or directly after the measurement!

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7 Mounting/Dismounting
7.1 Inserting/Exchanging the Measuring Tip
There are different measurement tips available for different wavelengths (see „Tab. 5.1: Variety of measure-
ment tips and detectors“ on page 5).
NOTICE
Danger of damaging the measuring tip
The small drill hole in the measuring tip can be blocked easily by dirt particles or by
touching it with bare hands.
When mounting/dismounting the tip, please wear powder-free latex gloves and ensure a
dirt- and dust-free environment.
1. Turn off the supply voltage.
2. Turn the drive wheel (see Fig. 7.1) clockwise until the disc extends approx. 15 mm into the measuring
window in a positive y-direction.
Drive Wheel
Measuring Tip Retainer
Fig. 7.1: Moving the disc into the measuring window
3. Turn the disc until the measuring tip retainer becomes visible in the opening of the housing.
4. Remove the fastening screws (Torx T8) as well as the retaining plate.
5. Carefully insert the new measuring tip in the disc (caution, the entrance aperture is located on the arched
side of the tip, see Fig. 7.2).

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Entrance Aperture
Fig. 7.2: Entrance aperture (pinhole) in the measuring tip.
Fig. 7.3: Inserting the measuring tip
6. Insert the retaining plate in the disc with the guidance groove pointing upwards and an angle of 45
degrees and press it downwards into the opening (see Fig. 7.4).
Fig. 7.4: Inserting the retaining plate
7. Insert the screws and fasten them hand-tight.
8. Move the measuring tip out of the measuring window to ensure it is protected.

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When turning the supply voltage back on, the measuring head automatically moves back into its
standby position.
7.1 Exchanging the Detector
The NIR detector is the standard detector of the FocusMonitor-W. For measurements with a CO2laser the
detector has to be replaced by a CO2detector.
NOTICE
Danger of damage for the detector sensor
The detector sensor must not be damaged and has to be protected from pollution.
Do not touch the detector sensor with your fingers and do not put it down on the sensor
surface.
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Only use insulating plastic screws to fasten the detector to prevent noise signals. Do not forget
the foam rubber plate, otherwise the disc may be mechanically blocked by the screws.
Mounting sequence:
1. Turn off the supply voltage
2. Turn the drive wheel anti-clockwise as long as
possible. Now the detector is in its dismounting
position.

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3. Carefully remove the two plugs from the detec-
tor, for example by means of long nose pliers.
4. Remove the fastening screws on both sides
of the bottom plate (please mind that the
screws have different lengths).
5. Tilt the housing backwards.

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6. Opened FMW
7. Remove the plastic retaining screws of the
detector with the short screw driver (included
in the scope of delivery) and carefully take the
detector out of the housing.
8. Build in the new detector in reversed order.
Make sure you do not forget the foam rubber
spacer!
Attention!
If the screws are tightened too firmly, they might
block the rotary disc! Only tighten the screws hand-
tight. The foam rubber spacer may not be com-
pressed by more than 50 % of its original thickness! Detector
x
x
2
Max.
Before
After
Foam Rubber Spacer

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7.2 Setting the Measurement Sensitivity of the Detect
Depending on the laser power, the sensitivity of the detector has to be set.
Detector Switch position Max. Laser Power with Focused Beam in Watt
CO2-Laser DFWCM-2 High 5 ... 50
Low 50 ... 500
YAG-Laser DFWY-2 High < 40
Low 40 ... 500
7.3 Installation Position
The FM-W was designed for a vertical beam incidence from above.
7.4 Alignment
1. When positioning the device in x- and y- direc-
tion, please make sure that the laser beam hits
the center of the semi-circle in the inlet aperture.
RS 232
Air in
Air out
24 V
Power
Data
Send
Trigger
Position of the Laser Beam
2. Move the system to the lower measurement
position of the z-axis.

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8 Basic Settings of the LaserDiagnosticsSoftware (LDS)
In the following, basic LDS settings are described which are required for a successful measurement. Saved
settings can be reloaded via the menu File>>Load measurement preferences. The standard extension
for such a setting file of the FocusMonitor is “.ptx“.
8.1 Measuring Environment
1. Select the menu Measurement >> Environment.
2. Enter/select the following:
- the focal length
- the wave length
- Maximum power
1.060 (Nd:YAG
200
100
8.2 Sensor parameters
1. Select the menu Measurement >> Sensor pa-
rameters.
2. Select:
- The revolutions per minute
- The resolution x=64, resolution y=64
- The used detector type
3. Activate
- The check box Manual z-axis
- The check box Twisted tip

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8.3 Beamfind Settings
1. Select the menu Measurement >> Beamfind
Settings...
Pixel X/Y
(factory setting=64) In order to find the laser
beam more easily, higher resolutions have to
be set for lower powers.
Trigger
Set lower values for smaller beam diameters.
Percent
Set higher values for a higher sensitivity
Window Size Factor
The factor indicates the relation between the
size of the measurement window and the
beam diameter.

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9 Measuring
WARNING
Danger of injuries due to laser radiation
Scattered radiation may develop during the measurement (laser class 4).
Please always wear laser safety goggles which are adapted to the laser wavelength used.
Please ensure an adequate shielding of the scattered radiation and the complete absorption
of the radiation passing the device.
Please ensure a vertical beam incidence into the measuring device.
9.1 Manual Caustic Measurement
The caustic measurement is a serial measurement in case of which the z-position is varied. Every z-position
is assigned an individual measurement plane with the respective measurement results.
1. Draw up a new file (File>>New) or open an exist-
ing file (File>>Open...)
2. Select the menu Measurement >> Single..
3. Select Plane 0.
4. Enter the desired z-position (e.g. -20).
5. Turn on the laser.
6. Click the Find beam button.
(The Find beam button automatically posi-
tions and selects the measuring window. The
z-position, however, remains unchanged and the
search is limited to the set window area).
7. Activate the check boxes Symmetric,
False color and Optim... after the beam
search.
8. Enter the laser power.
3
6
7
7
8
4
9. When adapting the found beam with x/y, please
make sure that it covers 50 to 70 percent of the
window size and that it is positioned centrally.
Window size
D ~ 50 % ... 70 %

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10. Click the Start button.
11. Turn off the laser after a successful measure-
ment. In case the measurement was not suc-
cessful, go back to step 8 and correct the window
adaption.
12. Move the system to the next measuring position.
13. Click the + button (plane 1).
14. Click the Copy button to copy all settings
(window size and –position;x, y, z; etc.) from the
previous plane to the present one.
15. Enter the new z-height (e.g. -16).
16. Turn on the laser and wait until it is stable.
17. Click the Start button.
18. When adapting the found beam with x/y, please
make sure that it covers 50 to 70 percent of the
window size (see step 9). 13
14
15 -16
17
19. Turn off the laser.
20. Move the system to the next measuring position.
21. Repeat steps 13 to 19 until all planes have been
measured.
22. Click the Stop Motor button.
Attention!
The measuring tip still rotates after the
measurement.
23. Save the data via File>>Save as...
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In order to make sure that the adapted values have a high significance, the measurement is to
be carried out in a z-range of at least two Rayleigh-lengths. A range of four Rayleigh-lengths – as
demanded in the ISO 11146 would be even better. 5 to 6 Rayleigh-lengths would be ideal.

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9.2 Caustic Display
The results of the caustic measurement can be displayed by means of the menu item Presentation>>Caustic.
On the left Fig. 9.1 shows the measured beam parameter either on the basis of the 86%-radii or the mo-
ment evaluation according to ISO 11146. In the middle of the picture the graphic shows the caustic profile.
The beam radii are depicted on the beam spread direction. On the right the false color presentation of one
measurement plane each – among other things selectable with the mouse - is shown together with numeri-
cal results of this single plane.
Fig. 9.1: Dialogue window Presentation>>Caustic
In order to evaluate the caustic, a hyperbolic compensating curve (ISO 11146) is adapted to the measuring
values. This compensating curve describes the propagation of an ideal laser beam mathematically.
The red line depicts a compensating curve according to the calculated fits which can be displayed via the
check box Fit in the 2D presentation
Further infor mation regarding further display- and evaluation possibilities can be found in the Operating
Manual “FocusMonitor/BeamMonitor“.

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10 Technical Data
Measurement Parameters
Power range up to 1000 W
Max. energy per measurement 90 kJ
Wavelength range 0.4 – 12 µm
Beam dimensions, typ. 150 – 3000 µm (optionaly up to 5000 µm)
Function of the Measuring System
Measurement window sizes 0.08 x 0.08 up to 8 x 8 mm
Optionally 0.08 x 0.08 up to 12 x 24 mm (at 64 pixel resolution)
Resolution 32 x 32 – 256 x 256 pixel
Rotation speed 1875, 3750 rpm
Supply Data
Power supply 24 V DC ± 5 %, max. 1.8 A
Communication
Interfaces RS 232
Dimensions and Weight
Dimensions (L x W x H) 185.5 x 156.5 x 193 mm
Weight, approx. 8 kg
Environmental Conditions
Operating temperature range +10 °C up to +40 °C
Permissible relative humidity (non-condensing) 10 – 80 %

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11 Dimensions
All measures are given in mm