B7.1 - Enhanced Signal Detection for Chlorophyll a Fluorescence Signal
- Event
- SMSI 2025
2025-05-06 - 2025-05-08
Nürnberg - Band
- Lectures
- Chapter
- B7 - Bio Sensing
- Author(s)
- S. Baghbani, A. Sarlak, S. Rupitsch - Albert Ludwig University of Freiburg, Freiburg(Germany)
- Pages
- 119 - 120
- DOI
- 10.5162/SMSI2025/B7.1
- ISBN
- 978-3-910600-06-5
- Price
- free
Abstract
Monitoring the quantum yield efficiency of Photosystem II evaluates plant health and stress by estimating electron transport rate in the photosystem. This measurement is typically performed using Pulse Amplitude Modulation (PAM) in combination with saturation pulses. The derived fluorescence signal is weak, often buried in noise, and has a low duty cycle. This contribution proposes a hybrid signal processing approach that combines aspects of boxcar averaging and lock-in amplification to extract low duty cycle signals from below the noise floor. We were able to detect the signals with a duty cycle of 0.01 %, with signal to noise ratio (SNR) up to −30 dB.