T6.1.4 - Frequency Multiplexing Method for Implementing a Reference Channel in Resonator-enhanced Direct Photoa-coustic Setups
- Event
- EUROSENSORS XXXVII
2025-09-07 - 2025-09-10
Wroclaw - Band
- Lectures
- Chapter
- T6.1 - Gas Sensors 4
- Author(s)
- D. Sieg, V. Kuczius, G. Rodríguez Gutiérrez, S. Palzer - Technical University Dortmund, Dortmund (Germany)
- Pages
- 150 - 151
- DOI
- 10.5162/EUROSENSORS2025/T6.1.4
- ISBN
- 978-3-910600-07-2
- Price
- free
Abstract
Direct photoacoustic setups offer means for selective and sensitive detection of trace gases, particularly when using light sources with emission profiles smaller that the absorption features of target moleculesand acoustic resonators to enhance the acoustic signal. However, those setups still require the meas-urement of the exciting light source’s intensity, which to date is achieved using photodiodes. Here a method relying on the position-dependent excitation of acoustic modes is proposed to determine light intensity and number density independently, which may be used to calibrate the signal’s dependence on light intensity without using additional components.