C3.2 - Using Photoacoustic Wave Interference to Improve the Signal-to-Noise Ratio in Gas Sensors
- Event
- SMSI 2023
2023-05-08 - 2023-05-11
Nürnberg - Band
- Lectures
- Chapter
- C3 - Photo Acustic Gas Sensors
- Author(s)
- Pages
- 159 - 160
- DOI
- 10.5162/SMSI2023/C3.2
- Price
- free
Abstract
Photoacoustic-based gas sensors are particularly suited to detect molecules with strong absorption features in the mid infrared spectral range. Especially indirect photoacoustic setups allow for building miniaturized, low-cost detectors. When using mid-IR LEDs as a light source, their low optical output power results in poor Signal to Noise Ratio (SNR), which is currently a limiting factor in terms of performance. In this contribution we make use of the properties of state-of-the-art MEMS microphones and the potential for modulating arbitrary waveforms in LEDs to demonstrate how the SNR may be improved.