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Micro/nanometer thin film-based eddy current force/deformation/pressure detection method

A nano-film and detection method technology, which is applied in the direction of fluid pressure measurement by changing ohmic resistance, can solve the problems of little stress, strain detection, difficulty in improving the rate of change of conductor eddy current, and being affected by distance, etc. Low production cost and the effect of increasing the degree of impedance change

Active Publication Date: 2018-06-01
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing eddy current technology is rarely used for stress and strain detection because it is difficult to improve the rate of change of eddy current in the conductor and is affected by distance.

Method used

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  • Micro/nanometer thin film-based eddy current force/deformation/pressure detection method
  • Micro/nanometer thin film-based eddy current force/deformation/pressure detection method
  • Micro/nanometer thin film-based eddy current force/deformation/pressure detection method

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Embodiment 1

[0045] Taking intraocular pressure detection as the first embodiment, the detection method of the present invention is described, but this example can also be used in other required fields. The method can determine the intraocular pressure according to the impedance of the eddy current sensor of the micro / nano film, and the method can effectively detect the measured object in real time.

[0046] The invention constructs a wireless and passive detection method based on eddy current detection technology, including micro / nano thin film and detection circuit. The principle framework of the detection circuit is as follows Image 6 As shown, the detection circuit mainly includes: an extraocular detection unit 01 and a host computer 10 . The extraocular detection unit includes a coil module 02, a pre-circuit module 03, a control circuit module 06, a wireless communication module 07, a power circuit module 08, a battery 09, an upper position 10, etc.; the coil module 02 is an inducta...

Embodiment 2

[0058] The technical solution of the present invention will be described below by taking breathing detection as another embodiment of the present invention.

[0059] Such as Figure 7 Shown is a schematic diagram of measuring human respiration using the eddy current detection method of the micro / nano film. The micro / nano film can be placed on the corresponding parts of the human body. Like the embodiment of intraocular pressure, a detection circuit may also be provided, including an in vitro detection unit, a host computer, etc. (same as Embodiment 1). The magnitude and strain for human respiration are relatively large, and the force exerted on the film is also relatively obvious. The micro / nano film in this embodiment does not need to be provided with microstructures. The film is attached to the body surface of the human body, so the base material of the film needs to choose a material with good compatibility with the human body, and choose a polymer material PU with good c...

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Abstract

A micro / nanometer thin film-based eddy current force / deformation / pressure detection method is characterized by comprising the steps of placing a micro / nanometer thin film on the surface of a detectedobject or embedded in the inner side, wherein in order to improve the detection sensitivity, a micro-nano structure also may be manufactured on the surface of or in the micro / nanometer thin film; setting a detection circuit, and placing a detection unit of the detection circuit at the outer side of the detected object, wherein the detection unit generates an alternating magnetic field. The force / deformation / pressure change of the detection object causes the micro / nanometer thin film to deform, so that an induction current on the micro / nanometer thin film changes, and after the induction current changes, the impedance of an induction coil in the detection unit changes, and the force / deformation / pressure change of the detected object can be sensed based on the impedance change. The detectionmethod detects the signals in the wireless and passive detection manners, a sensor in the method is simple in structure and high in stability, and the high-sensitivity non-contact measurement of thesignals, such as the strain, the stress, the pressure, etc., can be realized.

Description

technical field [0001] The patent of the present invention belongs to the detection field, and specifically relates to a detection method of eddy current force / deformation / pressure based on micro / nano film. Background technique [0002] At present, wireless and passive sensors and wireless and passive detection systems have attracted widespread attention due to their advantages of not needing to provide power supply and designing complicated wiring circuits. Wireless and passive sensors are widely used in various fields, such as in industrial detection and automatic control systems, liquid level, force and strain detection in petroleum, chemical, electric power, steel, machinery and other processing industries; automotive electronics and rail transit In the system, acceleration test and safety detection, etc.; in the field of household appliances, environment and device detection; in the field of robotics and aerospace, precision measurement of precision devices; in the fiel...

Claims

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Application Information

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IPC IPC(8): G01L9/02
CPCG01L9/02
Inventor 杨兴胡越铭任育宇王彬姚嘉林
Owner TSINGHUA UNIV
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