SS1 SunScan Canopy Analysis System

Ease of use

The SunScan plant canopy analyser probe consists of 64 PAR sensors embedded in a 1m-long probe. Whenever a reading is taken, all sensors are scanned, and the measurements are sent to a hand-held PDA, type RPDA3, via an RS232 interface. The average PAR level from the Probe is read, but all 64 individual readings can be stored for more complete PAR mapping or making linear transects. Automatic logging can be selected to obtain readings over a period of time at a fixed point. If connected to a data logger, the probe can function as a linear quantum sensor (also known as a line quantum sensor).

Rugged PDA

The RPDA3 is an exceptionally robust handheld PDA that collects and analyses readings from the SunScan Probe. Raw readings and derived functions, such as LAI, can be displayed, reviewed, and stored in the field by the SunData Software; groups of readings can be averaged if required. Readings are stored in the internal memory, which holds > 1 million readings, or in widely available micro-SD cards, which provide removable data storage. Collected data can be transferred easily to a PC.

Unique above-canopy reference sensor

The SunScan’s unique feature is an optional reference sensor integrated into the design to measure simultaneously the direct and diffuse light above the canopy. The BF5 Sunshine Sensor provides these above-canopy reference measurements quickly and conveniently. The BF5 uses an array of photodiodes and a unique shading pattern to calculate whether the sun is shining and to measure the direct and diffuse components of solar radiation. This completely avoids the need for troublesome shade ring adjustments required with conventional diffuse light sensors.

Radio Link option

An optional radio link connects the SunScan Probe and the BF5 reference sensor, removing the need for long connecting cables. The link operates over the 434 MHz licence-free frequency and can transmit up to 250 m line-of-sight or 100 m to 200 m in vegetation.