Abstract
This paper gives a description of a two-channel photoelectric planimeter for measuring leaf areas. It is based on the absorption of rays within the range 0.6 to 1.4μ. The flux of radiation is converted to electric signals by argentum sulphide photocells. The difference in the photoelectric currents from the measuring and control channels is amplified by a sensitive and highly stable d.-c. differential amplifier and is indicated by a meter which can be calibrated direct in area units.
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Claims 1
Claim · model-written summary
The photoelectric planimeter output can be calibrated directly in area units for leaf-area measurement.
Not reportedTaxon
Verbatim
e0“a two-channel photoelectric planimeter for measuring leaf areas.”
e1“is indicated by a meter which can be calibrated direct in area units.”