Plant Canopy Analyzer

Specification:
Sensor Inputs: Two 6-pin connectors for LAI-2250 Optical Sensors.
2 BNC connectors for LI-COR Light Sensors
Data Storage Capacity: 128 MB of FAT16 memory
Keypad: 22 button tactile response keypad
Display: 128×64 graphics display
Communications: USB (as mass storage device)
Global Positioning System (GPS RADIONOVA® RF Antenna Module):
Horizontal position accuracy: 2.5 m CEP (50% Circular Error Probability,
Open-Sky, 24hr Static, good view of the sky)
Maximum position update rate: 1 Hz
GPS receiver sensitivity, autonomous acquisition: -148dBm
WAAS enabled receiver
Time to first fix (TTFF), hot start: 1 second
TTFF, warm start: 6s (typical).
TTFF, cold start (with good view of the sky): 37 seconds at 90% probability
Clock: Year, Month, Day, Hour, Minute. Accuracy of ±3 minutes per month
Power Requirements: 4 “AA” alkaline, NiMH, lithium batteries
Battery Life:
90 hours based on 4 “AA” alkaline batteries without optical sensor attached and without GPS enabled
60 hours based on 4 “AA” alkaline batteries with optical sensor attached and without GPS enabled
40 hours based on 4 “AA” alkaline batteries without optical sensor attached and with GPS enabled
Low Battery Warning: Display indicates when battery power is < 15%
Size: 20.9 x 9.8 x 3.5 cm (8.2″ x 3.9″ x 1.4″)
Weight: 0.454 kg (1.0 lb) with batteries

Optical Sensor
Five silicon detectors arranged in concentric rings
Saves time — no need to wait for the sun’s position to change. Measures light from five different zenith angles with one reading.

LAI 2200C cutaway
Filter reduces errors from transmitted and reflected light
Sensor receives radiation below 490 nm only, where leaf reflectance and transmittance are minimal.

Correction for light scattering
A diffuser cap is used for collecting ancillary data for applying scattering corrections when operating in direct sunlight.

Automatic logging and autonomous modes
Useful for measuring tall canopies using two sensors.

Measures LAI of understory plants
Any object that blocks the sensor’s field-of-view by the same amount for both above and below-canopy readings will not influence the results. This allows, for example, measuring the LAI of grass beneath a tree as long as the tree is equally present in both above and below-canopy readings.

View restricting caps
Allow LAI measurements of small plots and hedges by blocking undesired objects from the sensor’s view, such as the operator or a neighboring plot.

Menu-driven interface
View GPS coordinates, Leaf Area Index (LAI), standard error LAI, apparent clumping factor, mean tilt angle (MTA), standard error MTA, sample size, and more. Basic data processing is available directly on the console.

Integrated GPS
Add location information with each reading or log GPS data independently with GPS tagging.

Light sensor logging
Use the two BNC connectors for attaching LI-COR quantum, pyranometer, or photometric sensors.

User-friendly features
Take advantage of automatic logging, USB data transfer, and a memory capacity of 1.5 million readings.