Schematic diagrams of the experimental setup (a) and the coaxial-type plasma torch (b).
Schematic illustrations of the connection between the field diaphragm and the fiber splice (a) and the effective optical path (b).
Schematic diagrams for verifying the refraction and absorption effects of the quartz cylinder on the emission intensity of the light source. Side view (a) and top view (b) of the test part without the quartz cylinder; side view (c) and top view (d) of the test part with the quartz cylinder.
Influences of the quartz cylinder on the emission intensity and its integrated radial distribution of the light source (a red LED).
Typical images of the plasma jets under different operation conditions as listed in Table I (exposure time: 0.2 s; the white lines indicate the plasma torch nozzle cap).
Variations in the integrated emission intensities of the line at 696.5 nm along the free plasma jet axis under different rf power inputs .
Variations in the integrated emission intensities of the line at 696.5 nm along the free plasma jet axis at different argon flow rates .
Influences of the quartz cylinder and/or substrate on the integrated axial distribution (a) and radial distribution with the inverse Abel transform (b) of the emission intensities of the line at 696.5 nm for the cases listed in Table I.
List of the cases studied in this paper.
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