AI Article Synopsis
- A new photoacoustic sensor for monitoring sulfur oxides (SO) has been developed, combining a differential photoacoustic cell with an affordable UV-LED for high sensitivity at the ppb level.
- To overcome issues with UV-LED light divergence, a lens-based combination module was designed, achieving a PA signal that was 20 times stronger than without the lens.
- The sensor demonstrated exceptional performance with minimal background noise interference (1 ppm) and reached a detection limit of 1.3 ppb after averaging for 100 seconds.
Article Abstract
We design a photoacoustic (PA) SO sensor based on the coupling of a differential photoacoustic cell (DPAC) and cost-effective UV-LED, which realized the dynamic monitoring of SO gas at the ppb level. Aiming at the limitation of UV-LED divergence, a light source combination module with high condensing efficiency was devised based on a lens through theoretical derivation and experimental analysis. The PA signal with the optimum matching of the lens was 20-times larger than the direct coupling of the UV-LED. Due to the excellent beam collimation effect of the lens assembly, the background interference was only 1 ppm. In addition, the DPAC gathered the merits of doubling the PA signal and reducing the flow noise interference. The analysis of Allan-Werle deviation showed that the detection limit of SO was 1.3 ppb with the averaging time of 100 s.
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| http://dx.doi.org/10.1364/OL.498908 | DOI Listing |
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