Keysight Technologies 81100 Series Guía de instalación
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81100 Family of Pulse/Pattern Generators
Double Pulse Generation for Particle Image Velocimetry
(PIV) Measurements
TECHNICAL
OVERVIEW
TECHNICAL
OVERVIEW
Introduction
Keysight Technologies, Inc. pulse/pattern generators are used for research in the
aerospace and defense industry, among others.
One example of their use is in the reduction of takeoff and landing times at
airports and the prevention of problems caused by wake vortex. Here, the industry
works with methods like PIV (Particle Image Velocimetry) where a laser sends
a double light pulse out. Particles in a flow get illuminated by the pulses and a
camera takes pictures every time the particle reflects the light. (Figure 1)
The 81150A can simulate this double light pulse by varying the delay and the
repetition frequency of the pulses.
Light pulse
Air flow, wind
Photo detector
Dust or
other particles
Laser
Figure 1. PIV method
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What do we need to stimulate a laser with double pulses
We need:
• Burst mode in general (Repetition
of a pulse pattern after a trigger)
• Double pulses
• Variable period/frequency
and internal frequency
21
Figure 2. The setup of a Keysight pulse generator and a Keysight infiniium oscilloscope
Required equipment:
• 1 x pulse/pattern generator
• 1 x infiniium oscilloscope
• 2 x BNC cables
Figure 3. Single pulse
Figure 4. Double pulse
Amplitude
Time
Amplitude
Pulse repetition frequency (Internal frequency)
Pulse delay (Period)
Time
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Now let’s set up the instrument
as shown in the screenshots.
Step 1:
First, reset the instrument by
pressing ‘Store/Recall’. Select
‘Set to defaults’ and choose
‘Yes’.
Select the ‘Pulse’ mode.
Step 2:
Change frequency into period
by pressing the frequency
button.
Step 3:
Set period to 38 ns, width to
16 ns and leading edge to 6 ns.
Figure 5. Step 2 and 3
Figure 6. Step 4
Step 4:
Press the ‘Burst’ button and set
#cycles to 2.
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Figure 7. Step 5 and 6
Step 5:
Press the ‘Trig’ button, select
source and choose internal.
Step 6:
Set ‘Int. Freq.’ up to 200 kHz.
Turn output 1 on by pushing
‘Out’ 1.
Step 7:
View the resulting double pulse
on an infiniium oscilloscope.
Figre 8. Step 7
Page 5
This information is subject to change without notice. © Keysight Technologies, 2019, Published in USA, October 29, 2019, 5991-2373EN
Find us at www.keysight.com
Related Literature
Publication title Pub number
Keysight 81100 Family of Pulse/Pattern Generators - Brochure 5890-0489E
Keysight 81150A and 81160A - Data Sheet 5967-5984E
Keysight 81130A Pulse-/Pattern Generator - Data Sheet 5967-6237E
81100 Family of Pulse/Pattern Generators Dual Clock Gbit Chip
Test - Technical Overview, Version 2.0 5991-2247EN
Simulation of Jittering Synchronization Signals for Video
Interfaces - Technical Overview, Version 2.0 5991-2257EN
Radar Distance Test to Airborne Planes - Application Note 5991-2284EN
Learn more at: www.keysight.com
For more information on Keysight Technologies’ products, applications or services,
please contact your local Keysight office. The complete list is available at:
www.keysight.com/find/contactus
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