Hao Zhang, Ling Wang, Jiandong Hu, Siqi Hu, Zheng Duan. Optical Pathlength Enhancement of Nanoporous Ceramics Using Tunable Diode Laser Absorption Spectroscopy[J]. Laser & Optoelectronics Progress, 2022, 59(16): 1630002
- Laser & Optoelectronics Progress
- Vol. 59, Issue 16, 1630002 (2022)
Fig. 1. Experimental set-up for oxygen detection in nano-porous ceramics based on TDLAS
Fig. 2. Measured second harmonic absorption signal of oxygen in ceramic sample with a porosity of 70%, a diameter of 100 mm, and a thickness of 15 mm
Fig. 3. Optimization of detection position. (a) Detection geometry; (b) distribution of laser shooting position; (c) spatial distribution of measured Leq
Fig. 4. Leqand Keq of ceramic samples with same porosity and different thicknesses. (a) Leq; (b) Keq
Fig. 5. Leq and Keq of ceramic samples with the same thickness as a function of porosity. (a) Keq;
Fig. 6. Experimental results of ceramic samples with 70% porosity and different thickness. (a) Oxygen transport characteristics; (b) relationship between gas transmission time constant and thickness
Fig. 7. Water vapor transport in 20 mm thickness of ceramic samples with 45% and 70% porosity
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Table 1. Equivalent pathlength enhancement coefficient of ceramics with different thickness and different porosity
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