7.2.4 - Dual-Resonance Indirect Photoacoustic Gas Sensing System for Sub-ppm Gas Detection
- Event
- EUROSENSORS 2026
2026-09-06 - 2026-09-09
Zurich - Band
- Lectures
- Chapter
- Physical Sensors
- Author(s)
- A. Srivastava, A. Bittner - Hahn-Schickard,Villingen-Schwenningen (Germany), A. Dehé - Albert-Ludwigs-Universität Freiburg,Freiburg (Germany)
- Pages
- 234 - 235
- DOI
- 10.5162/eurosensors2026/7.2.4
- ISBN
- 978-3-910600-12-6
- Price
- free
Abstract
This work presents a dual-resonance photoacoustic (PA) gas sensing system that exploits the spectral overlap between resonances of a Helmholtz acoustic cell and a piezoelectric MEMS cantilever to achieve enhanced sensitivity for carbon dioxide detection. The system employs a chopper-based modulation and a distributed feedback (DFB) laser operating near 4225 nm, targeting a strong absorption line of carbon dioxide. Lock-in-based photoacoustic measurements demonstrate a detection resolution of ca. 250 ppb of carbon dioxide in nitrogen at the atmospheric pressure.