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Wireless reading circuit for passive LC resonator sensor

A resonant sensor and readout circuit technology, applied in the field of sensors, can solve the problems of large volume, high price, unsuitable for on-site use, etc., and achieve the effect of simple circuit structure, small volume, and easy implementation.

Inactive Publication Date: 2013-09-04
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method usually uses commercial impedance analyzer equipment, which is bulky and expensive, and is not suitable for on-site use; in addition, the frequency at the phase minimum point is related to the coupling coefficient, making this measurement method unreliable

Method used

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  • Wireless reading circuit for passive LC resonator sensor
  • Wireless reading circuit for passive LC resonator sensor
  • Wireless reading circuit for passive LC resonator sensor

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Embodiment Construction

[0014] Below in conjunction with accompanying drawing, the present invention is further described in detail:

[0015] The invention relates to a wireless readout circuit of a passive LC resonant sensor, comprising a single-chip microcomputer control module 1, a frequency sweep signal generation module 2, a radio frequency bridge detection module 3, a buffer amplification module 4, buttons 5 and a display module 6. The frequency sweep signal generating module 2, the radio frequency bridge detection module 3, the buffer amplification module 4, the button 5 and the display module 6 are respectively connected with the single-chip control module 1, and the radio frequency bridge detection module 3 is connected with the buffer amplification module 4;

[0016] The radio frequency bridge detection module 3 includes a radio frequency bridge and a readout coil 7, wherein the upper left arm 8, the lower left arm 9, and the upper right arm 10 of the radio frequency bridge are made of preci...

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Abstract

The invention discloses a wireless reading circuit for a passive LC resonator sensor. The wireless reading circuit comprises a single chip microcomputer control module, a direct digital synthesis (DDS) swept signal generating module, a radio-frequency bridge detection module, a buffer amplifier module, a key and a display module, wherein four arms of a radio-frequency bridge respectively consist of three 50 ohm precision resistors and a reading coil; and one reading coil and the passive LC sensor form a loosely coupled transformer. The passive reading circuit is simple in structure and easy to implement, and can wirelessly measure the resonant frequency of the passive LC sensor to realize the passive wireless sensor function.

Description

technical field [0001] The invention belongs to the technical field of sensors and relates to a wireless readout circuit of a passive LC resonant sensor. Background technique [0002] Passive LC resonant sensor is a type of sensor composed of all passive components, usually an LC loop formed by an inductance coil and a sensitive capacitor connected in parallel. The resonant frequency of the LC circuit changes with the change of the sensitive capacitance, and the change to be measured is derived by measuring the change of the resonant frequency. According to the difference of the sensitive capacitance, passive wireless measurement of parameters such as pressure, humidity, temperature, etc. can be realized. This type of sensor is especially suitable for applications in sealed environments such as the interior of the human body, food containers, sealed medicines, or mechanical rotation, and harsh environments, and can theoretically work indefinitely. [0003] In order to measu...

Claims

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Application Information

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IPC IPC(8): G01D5/12
Inventor 陈洁张聪雷双瑛秦明
Owner SOUTHEAST UNIV
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