To provide a moisture modulus sensor which can rapidly and accurately measure a moisture modulus and to provide a culture solution supplying apparatus which can prepare an environment suitable for growing a plant with small wasteful expenses of the culture solution by utilizing this sensor.
In the moisture modulus sensor 2 for measuring the moisture modulus in a culture medium 5 based on a voltage value of a composite interference wave generated on a coaxial line 10 by a traveling wave on the coaxial line 10 and a reflecting wave from the medium 5 by applying a high frequency wave generated from an oscillator 12 from a metal rod 9 inserted into the medium through the line 10 into the medium 5, the impedance of the oscillator 12 is mismatched to that of the line 10, and an influence of a salinity in the medium 5 to the measured moisture modulus of the sensor 2 is reduced. The culture solution supplying apparatus compares the measured moisture modulus in the medium measured real time by the sensor 2 installed in the medium with a previously input target moisture regain value, and supplies the culture solution.
ITO MASAYUKI
TAJIMA SHINJI
NISHIMU DENSHI KOGYO KK
Takato Tsutsumi
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