The Doppler is an innovative PXIe optical module that enables compact, inexpensive and robust Photonic Doppler velocimetry.
Velocity measurement of fast-moving materials is essential to a growing number of scientific and technical fields including shock physics, the study of material properties, hypervelocity impact testing, detonics and shock wave experiments.
Photonic Doppler velocimetry (PDV) is an established technique used to measure high-velocity events up to tens of km/s. It is also known as heterodyne velocimetry and can be used as a supplementary tool or replacement for Velocity Interferometer System for Any Reflector (VISAR).
With the Doppler PXIe module, we provide the necessary equipment to perform reliable, repeatable measurements for simple or multiplexed PDV experiments built on the proven PXI platform.
It also supports traditional homodyne and frequency-shifted heterodyne PDV testing.
Accurate control and measurement of target, probe and reference power.
All of your optical power management in a single-slot PXIe module. This purpose built Doppler PXIe module streamlines your PDV test setup.
Generate reliable, repeatable measurements.
Minimise the number of manual optical connections necessary with the all-in-one optical doppler module for reliable and repeatable measurements, every time.
Drastically reduce the footprint of your test setup.
Replace the stack full of bulky individual optical test instruments with one small PXIe module and save your valuable lab space.
This product comes with a 3 year warranty.
Example 8-channel PDV setup
The 8-channel PDV system shown below consists of four Laser-1002 laser sources (Target and Reference), and eight Doppler PXIe modules. The output of the Doppler PXIe module is sent to a four high channel and high bandwidth O2E-1101 where the probe and reference laser beat. The electrical beat signal is then digitized with an oscilloscope.
All of this functionality is incorporated into the open standard PXI platform. This provides the user with flexibility to create large multiplexed systems and upgrade the system over time with higher bandwidth detectors and digitizers.
Our Photonic Doppler Velocimetry system is also available in a compact, benchtop form factor. It offers the same functionality as the Doppler PXIe module, and has simple USB and Ethernet connectivity for low channel count PDV systems.
Questions about PDV?
By working with many customers we have compiled a list of Frequently Asked Questions including PDV techniques and instrument selection.
What velocities can be measured with the sampling rate of my oscilloscope?
What type of tunable laser sources should I choose?
Why are two laser sources needed in a typical PDV system?
Should my PDV setup be heterodyne or homodyne?
Are there any reflection issues in a PDV system if foil or stainless steel is used?
What factors do I need to consider when I choose a collimator or a probe for my PDV system?
How do I protect the Doppler instrument from high-power laser at 1064 nm in my PDV system?
An introduction to PDV and multi-channel and multiplex systems
In this in-depth video, David McCormick, Technical Sales Manager for North America, provides an overview of Photonic Doppler Velocimetry (PDV) and provides in-depth examples of how to integrate multi-channel and multiplexing techniques using Coherent Solutions instruments.
Sensitivity Demonstration with a Class 1M Target Laser
In this video, David McCormick describes how replacing a high-power target laser with a Class 1M laser offers a number of advantages, and demonstrates optical-to-electrical output level versus reflection with real instruments.