Passive wireless sensor system based on third-order parity-time symmetry

A wireless sensing and passive technology, applied in the direction of signal transmission system, inductor, transformer/inductance parts, etc., to achieve the effect of enhanced sensitivity

Active Publication Date: 2019-11-08
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the inherent resolution of the sensor, the sensitivity of passive wireless sensors has become one of the limiting factors in ultra-sensitive detection, so realizing an ultra-high-sensitivity wireless sensing system has become an urgent problem to be solved

Method used

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  • Passive wireless sensor system based on third-order parity-time symmetry
  • Passive wireless sensor system based on third-order parity-time symmetry
  • Passive wireless sensor system based on third-order parity-time symmetry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: A resonant coil whose resonant frequency can be fine-tuned, which is prepared based on the unit structure of Magnet material.

[0045] One can be used for f 0 = 144.5kHz operating frequency under the high-power electric vehicle wireless power transmission magnetic material unit structure, which is composed of plexiglass plate (insulating dielectric plate), litz wire (metal wire) and capacitor (lumped parameter electronic components) .

[0046] Wherein, the structure of the plexiglass plate adopted by the magnetite material unit structure of the present invention is as follows: figure 1 , figure 2 As shown, the material is polymethyl methacrylate (PMMA). The geometric parameters of the plexiglass plate are as follows: the length of the plate is 120mm, the width of the plate is 120mm, and the total thickness of the plate is 31mm; wherein, the thickness of the top plate and the bottom plate are both 3mm, and the thickness that can be used for winding meta...

Embodiment 2

[0052] Embodiment 2: A conventional passive wireless sensing system based on a single resonant coil.

[0053] Traditional passive wireless sensing systems based on a single resonant coil such as Figure 4 As shown, the Keysight E5071C network analyzer is connected to the non-resonant source coil through port 1. The non-resonant source coil excites the transmitting coil through far-field radiation. The resonant frequency of the transmitting coil can be adjusted by adjusting the adjustable capacitor on the transmitting coil, and the corresponding reflection parameter S 11 ,Such as Figure 5 shown. Wherein the definition of ε in the figure means that the resonant frequency after adjusting the capacitance of a single resonant coil corresponds to the original resonant frequency f 0 = Offset value of 144.5kHz (in absolute value). The resonant frequency of a single resonant coil changes with the change of the adjustable capacitance, such as Figure 6 shown. The fitting results ...

Embodiment 3

[0054] Embodiment 3: A third-order PT symmetrical passive wireless sensor system composed of three resonant coils (Embodiment 1).

[0055] Such as Figure 7 As shown, the system includes a Keysight E5071C network analyzer 10, a non-resonant source coil 20, a transmitting coil 40 made according to Embodiment 1, a relay coil 60, a receiving coil 50 and a non-resonant load coil 30.

[0056] The non-resonant coils (source coil 20, load coil 30) are composed of litz wires (metal wires). Wherein, the litz wire is a polyimide film (PI film) polyester silk-covered wire with polyurethane enameled wire as the core wire, and the specification of the litz wire is 0.1×500 strands. In the embodiment of the present invention, the geometric parameters of the litz wire are as follows: the cross-sectional diameter of each wire is about 2.87mm, and the cross-sectional area of ​​the copper core is about 3.9mm 2 ; and the total length of the Litz wire used in the non-resonant source coil 20 in E...

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Abstract

The invention provides a passive wireless sensor system based on third-order parity-time symmetry. The system comprises one non-resonant source coil, three same-resonant-frequency resonance coils (including a transmitting coil, a repeating coil and a receiving coil) and one non-resonant load coil. Each resonance coil regulates the resonant frequency of a single coil by winding multiple turns of wires on the side of an insulated non-magnetic material frame and loading capacitors; by utilizing physical properties of a non-hermitian system based on third-order parity-time symmetry and adjusting coupling distance between the coils, the system is allowed to be located in a third-order exceptional point; and when external small disturbance acts on any one resonant coil, the frequency response ofthe third-order system varies with the cubic root of the external disturbance, so that effect of the small disturbance is greatly magnified, and the induction sensitivity of the system is significantly enhanced.

Description

technical field [0001] The present invention relates to the field of wireless detection technology and wireless sensor (sensor) technology, in particular to a system for wireless sensing based on the coupled resonance behavior of three resonant coils. Background technique [0002] In many industrial and medical fields, the monitoring technology of physical or chemical quantities is very important to us. However, in many cases, it is not possible to use wires to establish a direct connection between the test object and the sensor, such as intraocular pressure monitoring in medicine, tire pressure monitoring in the automotive industry, and high-temperature pressure sensing and other technical fields. Therefore, in the field of measurement technology, wireless sensors have potential advantages to realize non-contact measurement in these harsh conditions. In recent years, passive wireless sensors based on inductance-capacitance (LC) resonant circuits have been proposed in many ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/28H01F38/14G08C17/02
CPCG08C17/02H01F27/28H01F27/2823H01F38/14H01F2038/143
Inventor 曾超孙勇李果李云辉俞维健方恺张冶文江海涛陈宇光陈鸿
Owner TONGJI UNIV
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