Optical Sensor

LAI-2200Cdiagram

“Fisheye” lens with hemispheric field-of-view

Assures that LAI calculations are based on a large sample of the foliage canopy.

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.

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.

hemi-canopy-view-cap hemispherical-view2

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