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Measures incident and transmitted PAR in canopies Direct display of Leaf Area Index (LAI) Usable in cloudy and clear conditions Weatherproof and battery powered Proven, research-grade canopy analyzer Ideal for phenotyping based research The SunScan Canopy Analysis System uses field measurements of Photosynthetically Active Radiation (PAR) in crop canopies to provide valuable information about Leaf Area Index (LAI) and biomass […]
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The SunScan canopy analyzer is optimized for low regular canopies such as most agricultural crops. The 1m probe enables rapid spatial averaging of large areas,and PAR mapping for non-uniform crops such as vineyards and orchards. With the unique BF5 reference PAR sunshine sensor, the SunScan canopy analyzer can be used in most weather conditions.
Three configurations are available :| SS1-COM Complete System This is the complete package of SunScan items, including SunScan Probe, SunData Software, PDA, Sunshine Sensor type BF5, tripod and carrying case. | The full system provides a powerful canopy analysis tool. It can instantly calculate LAI, measure PAR interception using either spot readings or unattended logging and measure sunflecks |
| SS1-COM-R4 Complete System with Radio Link Includes a radio link between the modified SunScan Probe and the BF5 Sunshine Sensor. | The radio link has a range of 100 to 200m and replaces the cable between the SunScan Probe and BF5 - particularly useful in taller canopies or where reading are required at widely spaced locations. |
| SS1-STD3 Standard System The Standard System comprises the SunScan Probe, SunData Software and PDA. | The Standard System is able to make the full range of SunScan measurements, including LAI. The probe has to serve as its own above-canopy reference, so requires steady light conditions. |
The SunScan Canopy Analysis Probe
consists of 64 PAR Sensors embedded in a 1m long probe. Whenever a
reading is taken, all sensors are scanned and the measurements sent to a
hand-held PDA, type RPDA2, 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).
Windows Mobile PDA compatible
The
SunScan canopy analyzer is periodically updated and refined - building
on valuable user feedback. The latest improvement enables SunScan to be
used with compatible Windows Mobile PDAs, such as the RPDA2 hand-held
PDA offered by Delta-T. The RPDA2 is very robust, easy to use and can
hold more than 1 million readings on CompactFlash cards. LAI and other
readings can be displayed, reviewed and stored in the field using
SunData Software.
Upgrades
SunScan canopy analyzer systems with the previous DCT2 Psion Workabout data terminal
can be upgraded to the new RPDA2 with the benefit of improved
ruggedness, simpler operation and full Windows Mobile capability.
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 434MHz license-free frequency and can transmit up to 250m line-of-sight or 100m
to 200m in vegetation.
SunScan comparison with Li-Cor LAI-2000
A
2009 paper* in the Crop Science journal compared the use of SunScan
canopy analyzer and LAI-2000 systems for estimating LAI on upland rice
grown in Benin. The authors found that the SunScan canopy analyzer provided a highly significant measurement of LAI up to 4m2.m-2
compared to destructive sampling (slope of regression line = 1.00, R2 =
0.96) and in summary concluded that the SunScan can be used to estimate
LAI of different upland rice cultivars with various types of canopy
development. * Sone, C., K. Saito, and K. Futakuchi. 2009. Comparison of
Three Methods for Estimating Leaf Area Index of Upland Rice Cultivars.
Crop Sci. 49:1438-1443.
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