This paper summarizes what are the measuring techniques used in plasma spraying to characterize 1. plasma jets and their fluctuations: emission spectroscopy, laser scattering spectroscopy, enthalpy probes coupled to mass spectroscopy and fast cameras, 2. particles in flight in plasma jets: laser doppler anemometry, Phase Doppler Anernometry, fast two-color pyrometry, laser fluxmetry, hot particles light emission... 3. particles at impact: fast pyrometry and fast cameras, 4. substrate and coating temperature: IR pyrometry and IR thermography. The new set-ups to achieve an on-line control, on more precisely a monitoring of the spray process are also presented: DPV2000, Accuraspray, Plumespector, Spray watch, CCD cameras, SDC.
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