Frequency domain reflection-type soil humidity sensor
A technology of soil moisture and frequency domain reflection, applied in the direction of material capacitance, etc., can solve the problem of uneven monitoring accuracy of instruments
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[0011] [First Embodiment]
[0012] figure 1 Shown is a block diagram of the internal structure of the sensor according to the preferred embodiment of the present invention. in figure 1 Among them, the sensor includes a power module 20, an oscillation unit 31, a drive unit 32, an output probe 33, a feedback probe 41, a feedback data acquisition unit 42, an amplifying unit 43, a voltage-current conversion unit 44, a power input line 11, and a voltage / Current output line 12,. The voltage-current conversion unit 44 is an optional unit.
[0013] See figure 1 The oscillating unit 31 outputs a 100MHz standard test frequency signal, which is added to the output probe 33 via the drive unit 32. According to different soil moisture conditions, the feedback probe 41 obtains a feedback signal related to the soil moisture condition, and the feedback data acquisition unit 42 , The amplifying unit 43 outputs a voltage signal related to the soil moisture condition, or outputs a current signal re...
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[0014] [Second Embodiment]
[0015] figure 2 Shown is a block diagram of a sensor according to a second embodiment of the present invention. in figure 2 The sensor includes a frequency domain reflection type soil moisture sensor body 1, an output probe 33, a feedback probe 41, a power supply and output cable 10, and a voltage-current conversion unit 44. The voltage-current conversion unit 44 is an optional unit.
[0016] See figure 2 , The frequency domain reflection type soil moisture sensor body 1 uses resin potting, the output probe 33 and the symmetrically distributed feedback probe 41 use stainless steel probes, which can effectively prevent soil, moisture and other substances from damaging the sensor unit and probe. Influence, as an optional unit, the voltage-current conversion unit 44 is arranged outside the sensor body, which can realize current or voltage output, and is convenient for connecting various test instruments.
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