Abstract
In the present chapter, the coverage of plasma diagnostic techniques is extended to laser techniques such as Thomson and Rayleigh scattering, coherent anti-Stokes Raman spectroscopy (CARS), and laser-induced fluorescence (LIF). These offer significant advantages in terms of the range of plasma temperature to which they could be applied as well as their superior spatial resolution. These advantages have to be weighed, however, against increasing complexity and required investment cost. Essentially, all of these techniques are complimentary and should be used selectively depending on process/research needs.
In the latter part of this chapter, the review of plasma diagnostic techniques is extended to flow visualization, such as conventional, high-speed, or flash-assisted photography which have been shown to offer a valuable tool for the characterization and study of the flow dynamics as well as temperature fields in plasma sources in the absence or presence of particulate matter or liquid droplets. Such techniques are also enhanced through the use of “shadowgraph” and “Schlieren” photography which are based on variation of the refractive index in the flow field due to composition and/or temperature difference in the flow or density gradients in cold compressible flows. The last part of this chapter is dedicated to enthalpy probes which, while being intrusive, offer a valuable tool with excellent spatial resolution for the measurement of local temperature, velocity, and composition of plasma flows.
Emil Pfender: deceased.
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Abbreviations
- ABS:
-
Absorption spectroscopy
- AC:
-
Alternative current
- APJ :
-
Atmospheric plasma jet
- BS:
-
Beam splitter
- CARS:
-
Coherent anti-Stokes Raman spectroscopy
- CCD:
-
Charge-coupled device
- CW:
-
Continuous wave
- DC:
-
Direct current
- DFWM :
-
Degenerate four-wave mixing
- DSD:
-
Droplet size distribution
- EMR:
-
Electromagnetic radiation
- EP:
-
Enthalpy probe
- FFT :
-
Fast Fourier transform
- FWHM:
-
Full width at half maximum
- HC:
-
Hollow cathode
- HSP:
-
High-speed photography
- HVOF:
-
High-velocity oxyfuel
- LDA:
-
Laser Doppler anemometry
- LHS:
-
Left-hand side
- LIF:
-
Laser-induced fluorescence
- LTE:
-
Local thermodynamic equilibrium
- MS:
-
Mass spectrometer
- NIR:
-
Near infrared
- OES:
-
Optical emission spectroscopy
- OMA:
-
Optical multichannel analyzer
- P:
-
Polarizer
- PC:
-
Personal computer
- PC:
-
Phase conjugate
- PIV:
-
Particle image velocimetry
- PM:
-
Photomultiplier
- QMS:
-
Quadrupole mass spectrometer
- RF:
-
Radio frequency
- RHS:
-
Right-hand side
- SHG:
-
Second harmonic generation
- TA-LIF:
-
Two-photon absorption laser-induced fluorescence
- TBC:
-
Thermal barrier coating
- TD-LAS :
-
Tunable diode laser absorption spectroscopy
- THG:
-
Third harmonic generation
- UV:
-
Ultraviolet
- VPS:
-
Vacuum plasma spraying
- VUV:
-
Vacuum ultraviolet
- VUV-LAS :
-
Vacuum ultraviolet laser absorption spectroscopy
- WAS:
-
Wire arc spraying
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Boulos, M.I., Fauchais, P.L., Pfender, E. (2021). Plasma Diagnostics Lasers, Flow Visualization, and Probe Techniques. In: Handbook of Thermal Plasmas. Springer, Cham. https://doi.org/10.1007/978-3-319-12183-3_21-1
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