Cold Spray particle in-flight velocity and temperature measurements through combined comparative study using Telops, Oseir and Tecnar systems
Cold Spray particle in-flight velocity and temperature measurements through combined comparative study using Telops, Oseir and Tecnar systems
Monday, May 5, 2025: 4:30 PM
Room 18 (Vancouver Convention Centre)
In this study, the accuracy of in-flight cold spray particles measurements will be compared using high-speed detectors from Telops (FAST M3k), Oseir and Tecnar. Measurements are accomplished
at ES3 facilities in Texas, a long-term service contractor for the US military. While Oseir and Tecnar are systems directly developed for thermal and cold spray measurements, Telops high-speed cameras
have a broader use for many applications in infrared imaging. This study will showcase the output from an algorithm internally developed at Telops for cold spray data analysis to quicky obtain a
velocity and temperature estimate of the in-flight particles, and put those results in contrast to the industry standard of Oseir and Tecnar systems. While high frame rate is useful, the key parameter for
cold spray measurements discussed in this work is the exposure (or integration) time lower limits of each system to be able to capture the particle in frame. With a speed in the order of 500m/s, the
particle images are processed with a standard method of Particle Streak Velocimetry (PSV), using the smear of the particle for an array detector, and an in-depth statistical analysis of a large quantity
of particles allows for a reliable answer with a clear range of uncertainty. The results bring interesting differences and complementary information for these imaging systems operating in different spectral
wavelength regions, with the Telops camera operating in the longer wavelength band allowing the detection of colder particles.
at ES3 facilities in Texas, a long-term service contractor for the US military. While Oseir and Tecnar are systems directly developed for thermal and cold spray measurements, Telops high-speed cameras
have a broader use for many applications in infrared imaging. This study will showcase the output from an algorithm internally developed at Telops for cold spray data analysis to quicky obtain a
velocity and temperature estimate of the in-flight particles, and put those results in contrast to the industry standard of Oseir and Tecnar systems. While high frame rate is useful, the key parameter for
cold spray measurements discussed in this work is the exposure (or integration) time lower limits of each system to be able to capture the particle in frame. With a speed in the order of 500m/s, the
particle images are processed with a standard method of Particle Streak Velocimetry (PSV), using the smear of the particle for an array detector, and an in-depth statistical analysis of a large quantity
of particles allows for a reliable answer with a clear range of uncertainty. The results bring interesting differences and complementary information for these imaging systems operating in different spectral
wavelength regions, with the Telops camera operating in the longer wavelength band allowing the detection of colder particles.