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(a) Schematic diagram of a DBD apparatus for treating flat surfaces (see Ref. 4). (b) Schematic view of the second DBD system: (1) high-voltage ac power supply; (2) cylindrical chamber; (3) alumina-coated low-voltage electrode (2.54 cm Ø); (4) cylindrical (Kapton-covered) high voltage electrode (0.76 cm Ø); (5) gas inlet; (6) gas exit; (7) resistance for current measurements; (8) thermocouple [embedded in (3)]; (9) Bragg grating fibre-optic temperature sensor; (10) glass capillary; (11) BBS; (12) optical circulator, where In: Input, Tr: Transmitted, Br: Back reflection; and (13) OSA (see Ref. 21).
Voltage signals and total light emission (photocurrent) from DBDs at atmospheric pressure; (a) air (f = 3.5 kHz); (b) nitrogen (f = 3.5 kHz, 8 slm); (c) He (f = 14 kHz, 8 slm); and (d) pseudoglow in He: voltage and current signals (f = 2 kHz, 8 slm).
Calibration experiment: Temperature, T, measured by the FBG, Luxtron and a thermocouple, recorded in hot air up to ca. 120 °C. Note that the Luxtron data have been corrected by a constant ratio with respect to the thermocouple.
Gas (translational) temperature, T, recorded in the apparatus of Figure 1(b) using the FBG instrument in helium, argon, and neon DBD; F = 200 sccm; f = 15 kHz; d = 2.0 mm.
Temperature variation as recorded by FBG for discharges in static air (filamentary) and 10 slm of flowing nitrogen (diffuse glow) in the apparatus of Figure 1(a); P ∼ 200 W, f = 10 kHz.
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