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DIRECT READING OPTICAL LEAF AREA PLANIMETER
Author(s) -
Schurer K.
Publication year - 1971
Publication title -
acta botanica neerlandica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0044-5983
DOI - 10.1111/j.1438-8677.1971.tb00693.x
Subject(s) - collimated light , optics , light source , beam (structure) , light beam , range (aeronautics) , photoresistor , reading (process) , materials science , physics , laser , political science , law , composite material
SUMMARY An optical planimeter is described in which the light beam from a small source is collimated and subsequently focused on a photocell. It is shown that the area of even a thin leaf placed in the collimated part of the beam is measured accurately without the need for a correction for transmitted light. The instrument features linear response, digital read‐out, high speed, good stability, five ranges of 50 up to 1000 cm 2 , and an accuracy of 1% of the range.