SS1 SunScan canopy analysis system

Precision Canopy Light Interception and LAI Measurement

The SunScan System provides scientists and agronomists with a powerful tool for quantifying plant canopy architecture and function. The core component, the 1-meter-long SunScan Probe (SS1), contains a linear array of sensors that measure PAR light levels at multiple points beneath the canopy. Simultaneously, the unique BF5 Sunshine Sensor measures both the direct and diffuse components of incident sunlight above the canopy. The system's sophisticated software, based on models by Campbell and Norman-Jarvis, uses these measurements—along with solar position, leaf angle distribution, and absorption estimates—to accurately calculate Leaf Area Index (LAI), a critical parameter for understanding plant growth, light use efficiency, and ecosystem productivity.

Integrated Field Solution for Demanding Environments

Designed for real-world field conditions, the SunScan system is built for reliability and ease of use. The heart of the system is the Rugged PDA (RPDA), an IP67-rated handheld computer that runs the SunData software for instant data analysis, visualization, and storage in the field. The system can be configured for manual walking transects or for unattended logging at fixed points to capture diurnal patterns of light interception. An optional radio link (BF5-RL4 & SS1-RL4) eliminates cables between the probe and reference sensor, allowing for flexible setup over distances up to 250 meters. This integrated approach makes the SunScan the ideal solution for advanced crop research, canopy ecology studies, and precision agriculture applications.

Key Advantages of the SunScan System

• Comprehensive Canopy Analysis: Accurately measures transmitted and incident PAR to calculate key parameters like Leaf Area Index (LAI) and light interception fraction.
• Advanced Environmental Modeling: SunData software incorporates sophisticated models that account for solar angle, diffuse/direct light fractions, and leaf angle distribution for superior accuracy.
• Ruggedized for Field Use: The IP65-rated probe and IP67-rated RPDA are built to withstand harsh environmental conditions, including dust, moisture, and drops.
• Wireless Flexibility: Optional radio link allows the BF5 reference sensor and SunScan probe to operate completely untethered, simplifying setup over large areas.
• Immediate Data Insight: View, analyze, and average readings directly on the RPDA in the field, enabling real-time decision-making and validation.

Optimal Application and Use

For a typical measurement, place the BF5 Sunshine Sensor on a tripod in a fully exposed location to measure incident light. Walk through the crop canopy with the SunScan Probe held horizontally at the desired height (e.g., at ground level for total interception). The RPDA will automatically synchronize readings from both sensors via cable or radio link. Ensure the BF5 is level and has a clear view of the sky. For the most accurate LAI calculations, perform measurements under overcast conditions (high diffuse light fraction) or during mid-day periods, avoiding times when the sun is strong and near the horizon. The system can also be left in unattended logging mode to capture continuous data over time.