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Filtered dielectric sensor apparatus

  • US 10,114,054 B1
  • Filed: 06/09/2018
  • Issued: 10/30/2018
  • Est. Priority Date: 05/11/2015
  • Status: Active Grant
First Claim
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1. A dielectric sensor apparatus comprising:

  • a. a sensor assembly further comprising;

    i. a voltage signal generator which provides a carrier frequency;

    ii. a transmission line probe of one or more segments and being formed of two parallel input lines, where one input line is coupled to a fixed potential, and one input line is coupled to the signal generator through a complex impedance network; and

    iii. an AM demodulator coupled to the transmission line probe, providing an output voltage through at least one output data line, whereby the dielectric level of the material may be determined;

    b. a microprocessor coupled to the output data line and further coupled to at least one input-output data line which connects to a filter assembly;

    c. a power voltage network further comprising a network voltage source, a plurality of power nodes within the dielectric sensor apparatus and a power voltage line connected to the network voltage source;

    d. a return voltage network with a plurality of return nodes within the dielectric sensor apparatus and a return voltage line connected to the network voltage source;

    e. a cable of wires which includes the power voltage line, the return voltage line and the at least one input-output data line; and

    ,f. the filter assembly, located on a sensor side of the cable, further comprising, on each of the at least one input-output data line and the power line of the power voltage network, an inductor in series with the cable and a capacitor, on a sensor side of the inductor and shunted to the return voltage network, and, in the return voltage network, an inductor in series with the cable,wherein the transmission line probe is inserted into a medium having a dielectric constant and the AM demodulator provides an output voltage signal correlated to the medium'"'"'s dielectric constant and a length of the transmission line probe that is inserted in the medium.

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