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What is the Monitoring-PAM Sensor? Looking at Photosynthesis Itself
The PAM (Pulse Amplitude Modulation) chlorophyll fluorescence sensor is an advanced plant physiology sensor that directly measures how efficiently photosynthesis works in the plant.
It is not indirect like NDVI; it measures photosynthesis itself.
How Does It Work?
The sensor uses three main light components:
1. Pulsed Excitation Light
- It sends short, controlled light pulses to the leaf.
2. Pulsed Chlorophyll Fluorescence
- Chlorophyll responds to this excitation by emitting fluorescence light.
- This signal is measured.
3. Ambient Light
- Measurements can be made even in the presence of sunlight.
- Thanks to the PAM technique, it is separated from ambient light.
What Does It Measure?
Basic Measured Parameters
The PAM sensor provides the following critical photosynthesis parameters.
- F₀: Minimum fluorescence
- Fₘ: Maximum fluorescence
- Fᵥ/Fₘ: Photosystem II (PSII) maximum quantum yield
Healthy Plant Range:
