Micropower peak strain detection system for remote interrogation
First Claim
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1. An electronic device powered by a remote source of electromagnetic radiation, comprising:
- an antenna for receiving a radiated electromagnetic signal from the remote source, wherein the radiated electromagnetic signal induces an ac signal in said antenna; and
a first element and a second element, said first element having a moveable mechanical member, said first element for providing an electrical signal, wherein magnitude of said electrical signal depends on position of said moveable mechanical member, wherein said first element uses an ac signal derived from said ac signal induced in said antenna, and wherein said second element includes a circuit that uses a dc signal derived from said ac signal induced in said antenna.
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Abstract
A sensing device includes an RFID chip and a differential variable reluctance transducer (DVRT) sensor that can be read remotely with electromagnetic power provided to the device from a remote reader. The ac signal provided to the device by inductance is used for powering the RFID chip and exciting the sensor. Data read from the sensor can also be transmitted back to the reader using the power provided by the reader. The sensor circuit uses a lower amount of current than the RFID chip, so it does not contribute appreciably to device power requirements.
252 Citations
52 Claims
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1. An electronic device powered by a remote source of electromagnetic radiation, comprising:
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an antenna for receiving a radiated electromagnetic signal from the remote source, wherein the radiated electromagnetic signal induces an ac signal in said antenna; and
a first element and a second element, said first element having a moveable mechanical member, said first element for providing an electrical signal, wherein magnitude of said electrical signal depends on position of said moveable mechanical member, wherein said first element uses an ac signal derived from said ac signal induced in said antenna, and wherein said second element includes a circuit that uses a dc signal derived from said ac signal induced in said antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An electronic device powered by a remote source of electromagnetic radiation, comprising:
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an antenna for receiving the radiation from the remote source, wherein the radiation induces a signal in said antenna; and
a sensor and a circuit for reading said sensor, wherein said sensor uses an ac signal derived from said signal induced in said antenna, and wherein said circuit for reading said sensor uses a dc signal derived from said signal in said antenna. - View Dependent Claims (28, 29, 30, 31, 32, 33)
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34. A method of reading a remote sensing device, comprising the steps of:
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providing a reader capable of radiating an electromagnetic signal;
providing said remote sensing device, wherein said remote sensing device comprises an antenna for receiving said radiated electromagnetic signal from said reader, wherein said radiated electromagnetic signal is for inducing a signal in said antenna, wherein said remote sensing device further comprises a sensor and a circuit for reading said sensor connected to said sensor, wherein said sensor uses an ac signal derived from said signal induced in said antenna and provides an output signal to said circuit for reading said sensor, and wherein said circuit for reading said sensor includes a device that uses a dc signal derived from said signal induced in said antenna; and
bringing said reader in range of said remote sensing device. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. A method of reading a remote device, comprising the steps of:
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providing a reader capable of radiating an electromagnetic signal;
bringing said reader in range of a remote device, said remote device comprising an antenna capable of receiving said radiated electromagnetic signal from said reader;
radiating said remote device with said electromagnetic signal from said reader, wherein said electromagnetic signal induces a signal in said antenna, wherein said remote device further comprises a circuit comprising a first element and a second element connected to said first element, said first element having a moveable mechanical member, said first element for providing an electrical signal to said second element, wherein magnitude of said electrical signal depends on position of said moveable mechanical member;
wherein said first element uses an ac signal derived from said antenna for other than generating dc power; and
generating a dc signal from said signal induced in said antenna, wherein said second element uses said dc signal. - View Dependent Claims (46, 47)
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48. An electronic device for receiving a radiated electromagnetic signal transmitted by a remote source, comprising:
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an antenna for receiving the radiated electromagnetic signal transmitted by the remote source, wherein the radiated electromagnetic signal induces a signal in said antenna; and
a first element and a second element connected to said first element, wherein said first element is connected to receive an ac input signal derived from said signal induced in said antenna, further wherein said second element uses a dc signal derived from said signal in said antenna, and wherein said first element and said second element are connected in s a circuit to get all their power from said signal induced in said antenna. - View Dependent Claims (49, 50, 51, 52)
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Specification