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Radiation Spectral Analysis and Particle Temperature/Velocity Measurement in Plasma Spray with One-Color Camera

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Abstract

A color camera optical diagnostic imaging system has been developed for the measurement of temperature and velocity of individual in-flight particles in thermal plasma spray, based on the principle of particle streak velocimetry and two-color thermometry. Radiation spectral analysis of the characteristic behavior of a particle-laden plasma plume was performed to identify an optimal spectral range for accurate temperature measurements over which the powder particles and the interfering thermal plasma gas are discernable. Calibration of the thermal imaging system was carried out using a blackbody furnace with uncertainties less than 1.8%. Extensive experimental measurements were taken with the optical imaging system to obtain the temperature and velocity distributions of YSZ particles in practical plasma spraying applications. The uncertainties of the measured temperature and velocity with a color camera system mostly fluctuate around ±10% in comparison with data obtained from a commercially available measuring system.

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Abbreviations

R :

The intensity of red channel

G :

The intensity of green channel

\(C_{1}\) :

The first radiation constant, 3.741832 × \(10^{8} \,{\text{Wm}}^{ 4} / {\text{m}}^{ 2}\)

\(C_{2}\) :

The second radiation constant, 1.4388 × \(10^{4} \,{\text{mK}}\)

r :

The spectral responsivity of the red channel of the CCD sensor

g :

The spectral responsivity of the green channel of the CCD sensor

k :

The transmission of the optics components in the imaging setup

Distance:

The distance between the centerline of the imaging setup and the plasma gun exit

WD:

The distance between the front end of the imaging setup and the centerline of the plasma gun

\(\lambda\) :

Wavelength (nm)

ε :

Emissivity

υ :

Velocity (m/s)

CCD:

Charge-coupled device

YSZ:

Yttria partially stabilized zirconia

FWHM:

Full width at half maximum

b :

Blackbody

c :

Calculated temperature

s :

Results measured by commercial setup

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Acknowledgments

The author wishes to thank Huan Yang, Xinbing Jiang, Shaowen Xuan, Yongming Qiang and Wei Yu, for their assistance with this work. The assistance of the teammates of Material School of Xi’an Jiaotong University is also gratefully acknowledged.

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Authors and Affiliations

  1. State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an, 710049, Shaanxi, China

    B. H. Wang & Huan Yang

  2. Department of Mechanical Engineering, University of Michigan-Dearborn, Dearborn, 48128, MI, USA

    B. Q. Li

  3. School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an, 710049, Shaanxi, China

    Y. Bai

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  1. B. H. Wang
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Correspondence to B. Q. Li.

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Wang, B.H., Li, B.Q., Yang, H. et al. Radiation Spectral Analysis and Particle Temperature/Velocity Measurement in Plasma Spray with One-Color Camera. J Therm Spray Tech 26, 1632–1640 (2017). https://doi.org/10.1007/s11666-017-0589-7

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  • DOI: https://doi.org/10.1007/s11666-017-0589-7

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