位置検出機構内蔵リニア直流モ-タによる植物茎径の非接触計測

概要

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It is important to measure the growth of plant for analyzing the physiological phenomenon of plant. As the growth of plant is usually measured by the sensor that touches on plant, it is influenced by touching pressure. Especially, there is no literature about measuring a little young plant just after germination.The equipment measuring stem diameter is made by the combination the Linear DC Motor(LDM) and optical sensor. It can measure stem diameter without touching on it at arbitrary periodin long term. This LDM has a new type linear suspension and flat type linear variable differential transformer (LVDT). As the mover of the LDM is held by the special spring suspension, that is driven to only one direction without friction and displacement to other direction. The new LVDT, composed in the LDM, is constructed of four fixed detective coils and magnetic driving coil, that is used as both the thrust coil of the mover, So that the LDM can detect fine position.The optical probe, that is the beam of a LED and a photo diode, is drived for 20.48mm by the mover, and the apparatus can detect the maximam diameter 20mm of growth of plant stem for fine displacements less than 5 μm errors.
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