At Forschungszentrum Jülich, we have used the Dpv extensively and successfully for over 15 years to better understand and optimize our thermal spray processes. Its unique capability to simultaneously measure the temperature, velocity and size of individual particles and to perform cross-sectional maps of the spray plume has had a tremendous impact on our activities in the fields of process development, parameter optimization and quality management.
Dr. Georg Mauer
Head of Thermal Coating Technology Team
Institute of Energy and Climate Research (IEK-1)
Forschungszentrum Jülich GmbH, Germany
GE Global Research
National research Council Canada
Sandia National Laboratories
SUNY Stony Brook
Xian Aerospace Materials Institute
Individual particle characterization for spray processes
The Dpv was the first commercially available sensor to characterize thermal spray processes. With its cleverly designed measurement volume and pattern recognition algorithms, the Dpv evolution can characterize particles individually and provide complete temperature, velocity and size distributions (not only mean values).
Over the last 21 years, the Dpv has become the industry standard in the thermal spray research community and is the basis of over 600 scientific papers.
In thermal spray, a material initially in the form of solid powder or wire is fed to the high-temperature spray torch to be melted and accelerated toward the parts to be coated. Before impinging on the substrate, the material is in the form of liquid droplet/particles, ranging from 1 to 150 microns in size, depending on the application. The particles typically travel at velocities from 50 to 1200 m/s, depending on the type of process/spray conditions used and their surface temperature may vary from 1,000° to 3,500° Celsius. The Dpv evolution measures the infrared radiation emitted by the liquid droplets and uses that data to calculate the individual particle’s temperature, velocity and size.
Temperature measurement from 1,000° to 4,000° Celsius
Velocity measurement from 5 to 1,200 m/s
Diameter measurement from 10 to 300 microns
DPV Evolution technical specifications
Measurement volume information
Dimensions and weight
90 mm x 33 mm
3.5 in. x 1.3 in.
300 mm x 125 mm x 330 mm
11.8 in. x 4.9 in. x 13 in.
560 mm x 260 mm x 660 mm
22 in. x 10.2 in. x 26 in.
430 mm / 17 in.
1024 x 768 minimum resolution
100 /120 – 200 /230 VAC, 50-60 Hz, auto-switch
Plant to supply
20-30 psi of clean, dry compressed air