Material-discerning sensing by measurement of different points of impedance
First Claim
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1. A material-discerning proximity sensing device comprising:
- an antenna that is arranged to radiate a radio-frequency signal;
a capacitive sensor that is arranged to detect a change in capacitance of the capacitive sensor and that is arranged to receive the radio-frequency signal;
an electrical quantity sensor that is arranged to detect a change of the received radio-frequency signal; and
at least one band pass filter;
wherein the electrical quantity sensor is arranged to detect a change in a radio-frequency signal at an output of the at least one band pass filter.
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Abstract
A material-discerning proximity sensor is arranged to include an antenna that is arranged to radiate a radio-frequency signal. A capacitive sensor is arranged to detect a change in capacitance of the capacitive sensor and to receive the radio-frequency signal. An electrical quantity sensor is arranged to detect a change of the received radio-frequency signal and a change of a radio-frequency signal at an output of the at least one band pass filter.
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Citations
18 Claims
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1. A material-discerning proximity sensing device comprising:
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an antenna that is arranged to radiate a radio-frequency signal; a capacitive sensor that is arranged to detect a change in capacitance of the capacitive sensor and that is arranged to receive the radio-frequency signal; an electrical quantity sensor that is arranged to detect a change of the received radio-frequency signal; and at least one band pass filter; wherein the electrical quantity sensor is arranged to detect a change in a radio-frequency signal at an output of the at least one band pass filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A material-discerning sensing system comprising:
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an antenna that is arranged to radiate a radio-frequency signal; a capacitive sensor that is arranged to detect a change in capacitance of the capacitive sensor and that is arranged to receive the radio-frequency signal; a electrical quantity sensor that is arranged to detect a change of the received radio-frequency signal; at least one band pass filter; wherein the electrical quantity sensor is arranged to detect a change in a radio-frequency signal at an output of the at least one band pass filter; and a processor that is arranged to monitor detected changes of the received radio-frequency signal and detected changes in the radio-frequency signal at an output of the at least one band pass filter and in response to the detected changes of the received radio-frequency signal and detected changes in the radio-frequency signal at an output of the at least one band pass filter determine a type of material. - View Dependent Claims (13, 14)
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15. A method for material-discerning sensing comprising:
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radiating a radio-frequency signal using an antenna; detecting a change in capacitance of a capacitive sensor; receiving the radio-frequency signal using the capacitive sensor; detecting a change of the received radio-frequency signal; detecting a change in a radio-frequency signal at an output of the at least one band pass filter; monitoring the detected changes of the received radio-frequency signal; monitoring the detected changes in a radio-frequency signal at an output of the at least one band pass filter; and determining the type of material in response to the detected changes of the received radio-frequency signal and the detected changes in a radio-frequency signal at an output of the at least one band pass filter. - View Dependent Claims (16, 17, 18)
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Specification