C-Dax pasture meter+, Руководство по эксплуатации

Страница: 11 / 38

4
The geometry and construction of the central section of the sled frame has been
designed to minimize dirt fouling the polycarbonate windows covering the
sensor’s light beams. However, given the nature of measuring pasture cover,
particularly post grazing, the polycarbonate may occasionally need cleaning. How
often this is required is entirely dependent upon the environment in which the
device is working.
Operator experience and regular inspection of the polycarbonate windows will
ensure reliability of results.
The Sensor
The sensor consists of 18 light beam emitters at 20 mm spacings on one side of
the sensor frame and 18 light beam detectors at 20 mm spacings on the other
side of the sensor frame. In operation, 18 light beams exist between one side of
the sensor and the other. Whenever any light paths between the two sides are
broken, the result is recorded as a relative height measurement.
The sensor measures the height of grass at 20mm increments and then converts
this into kgDM/ha . Some grass obviously falls between the light beams and must