A passive wireless sensor for the measurement of ac electric field in the vicinity of high voltage apparatus
AssigneeUniversity of Manitoba
InventorsMana Yazdani, Behzad Kordi, Douglas J. Thomson
Life of this patent
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Abstract
A new passive wireless electric field sensor is disclosed. This sensor does not require direct attachment to a source of power which makes it passive. It is composed of a resonator loaded with varactors. The sensor is interrogated by a remotely located device transmitting and receiving the pulses of sine wave in the resonance frequency range of the sensor. Therefore, the sensor can be mounted in the vicinity of high voltage apparatus and interrogated from a safe distance.
Claims33
A method of measurement of AC electric field in the vicinity of high voltage apparatus, the method comprising:
- transmitting radio frequency (RF) sine wave pulses to a passive sensor placed within an AC electric field, the passive sensor comprising:
- an inner cylinder and an outer cylinder comprising a coaxial cavity resonator having an air filled gap;
- a top surface comprises a printed circuit board material having a varactor thereon spanning a ring gap surrounding an isolated region coupling the inner and outer cylinders;
- and
- a coaxial connector on the outer cylinder for coupling to an antenna for receiving a wireless signal wherein the wireless signal comprising RF pulses for generating a ring back signal for measuring of the AC electric field;
- receiving an RF ring back signal from the passive sensor;
- determining a resonant frequency of the passive sensor;
- determining a reverse bias voltage of the inducing electric field from the received RF ring back signal and the determined resonate frequency;
- and
- determining an electric field measurement value from the determined bias voltage.
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A passive sensor for measurement of AC electric field in the vicinity of high voltage apparatus, the resonator comprising:
- an inner cylinder and an outer cylinder comprising a coaxial cavity resonator having an air filled gap;
- a top surface comprises a printed circuit board material having a varactor thereon spanning a ring gap surrounding an isolated region coupling the inner and outer cylinders;
- and
- a coaxial connector on the outer cylinder for coupling to an antenna for receiving a wireless signal wherein the wireless signal comprising RF pulses for generating a ring back signal for measuring of the AC electric field.
A system for measuring a high voltage AC electric field of a high voltage apparatus, the method comprising:
- a passive AC electric field sensor, placed in proximity to an AC electric field, for receiving RF pulses and generating a ring back signal, the passive AC electric field sensor comprising:
- an inner cylinder and an outer cylinder comprising a coaxial cavity resonator having an air filled gap;
- a top surface comprises a printed circuit board material having a varactor thereon spanning a ring gap surrounding an isolated region coupling the inner and outer cylinders;
- and
- a coaxial connector on the outer cylinder for coupling to an antenna for receiving a wireless signal wherein the wireless signal comprising RF pulses for generating a ring back signal for measuring of the AC electric field;
- and
- an interrogation system for generating the RF pulses wireless sent to the passive AC electric field sensor and receiving the ring back signal from the passive AC electric field sensor and determining an electric field value for an inducing electric field.
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Dependencies are inferred from the claim text.