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Wireless passive measuring method and circuit

A wireless passive, measuring circuit technology, used in in-vivo radio detectors, diagnostic recording/measurement, and the use of electro/magnetic devices to transmit sensing components, etc. Debugging, simple structure, small size effect

Active Publication Date: 2011-04-06
CAPITAL UNIVERSITY OF MEDICAL SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former method is often limited to transmit signals through wires; the latter method needs to configure electronics for sensors and wireless transmitters to supply power, so its size, life, weight, etc. are restricted by batteries

Method used

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  • Wireless passive measuring method and circuit

Examples

Experimental program
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Effect test

Embodiment 1

[0010] Embodiment one: if figure 2 As shown, in the wireless passive pressure measurement circuit of the present invention, the capacitive pressure sensor C and the coil L2 form a parallel resonant circuit, and the coil L2 and the detection coil L1 form a loosely coupled transformer B. When measuring, first connect the detection coil L1 of the loosely coupled transformer B to the pulse excitation signal generator through the switch K, and the external circuit generates a pulse signal from the pulse excitation signal generator, and the loosely coupled transformer B excites the capacitive pressure sensor C and the coil L2 A parallel resonant circuit is formed, and then the detection coil L1 of the loosely coupled transformer B is switched to the resonant signal period measurement circuit through the switch K to measure the period of the oscillating signal of the resonant network, and then the pressure value sensed by the capacitive pressure sensor can be obtained by calculation....

Embodiment 2

[0023] Embodiment two: if image 3 As shown, in the wireless passive displacement measurement circuit of the present invention, the capacitor C and the inductive displacement sensor L2 form a parallel resonant circuit, and the inductive displacement sensor L2 and the detection coil L1 form a loosely coupled transformer B. When measuring, first connect the detection coil L1 of the loosely coupled transformer B to the pulse excitation signal generator through the switch K, and the external circuit generates a pulse signal from the pulse excitation signal generator, and the excitation capacitor C of the loosely coupled transformer B and the inductive displacement sensor L2 A parallel resonant circuit is formed, and then the coil L1 of the loosely coupled transformer B is switched to the resonant signal period measurement circuit through the switch K to measure the period of the oscillating signal of the resonant network, and then the displacement value sensed by the inductive disp...

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Abstract

The invention discloses a wireless passive measuring method and a circuit. The circuit comprises a wireless passive sensor part and an external controller part, wherein the wireless passive sensor part consists of a capacitor and a coil; and either the capacitor or the coil is a sensor and can work without a power supply. The invention has the characteristics of simplicity, small volume, light weight and the like, and is particularly suitable for measuring occasions where long-term detection is needed and a connecting line is absent.

Description

technical field [0001] The invention relates to a method and a circuit for measuring physical quantities such as pressure, temperature and displacement, in particular to a method and a circuit for wireless and powerless physical quantities. Background technique [0002] Generally, when it is necessary to measure the pressure, displacement, and temperature of a certain organ inside a container, an animal, or a human body, an invasive method can be used, that is, the pressure, displacement, and temperature sensors output signals through wires. Wireless methods can also be used. The former method is often limited to transmit signals through wires; the latter method needs to configure electronics for sensors and wireless transmitters to supply power, so its size, life, weight, etc. are all restricted by batteries. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method and circuit for measuring physical quantities ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/24A61B5/07A61B5/00
Inventor 张旭刘庆凯任朝晖崔南董谦李刚林凌
Owner CAPITAL UNIVERSITY OF MEDICAL SCIENCES
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