Keysight Technologies 81100 Series Technical Overview

81100 Family of Pulse/Pattern Generators Double Pulse Generation for Particle Image Velocimetry (PIV) Measurements T E C H N I C A L O V E R V I E W 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

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 2 1 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

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.

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

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