1.2.4 - Trace Level Moisture Sensing using a Resonant Photoacousic Sensor with an LED as Light Source
- Event
- EUROSENSORS 2026
2026-09-06 - 2026-09-09
Zurich - Band
- Lectures
- Chapter
- Optical Sensors
- Author(s)
- C. Weber, A. Eberhardt, M. Benkendorf, K. Schmitt, J. Wöllenstein - Fraunhofer IPM,Freiburg (Germany)
- Pages
- 54 - 55
- DOI
- 10.5162/eurosensors2026/1.2.4
- ISBN
- 978-3-910600-12-6
- Price
- free
Abstract
Measuring the water content of gas mixtures is relevant in a large variety of industrial applications ranging from pressurized air to energy or process control applications. Here we present a novel photoacoustic sensor design that uses a LED with a wavelength of 2.7 µm and a radial resonator to achieve detection limits in the single-digit ppm region at averaging time of over 20 seconds. An 8-hour zero-gas measurement shows no drift over this period, enabling even lower detection limits with high averaging times.