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Material tiny dielectric change real-time detection method and device based on radio frequency technology

A radio frequency technology, real-time detection technology, applied in the direction of measuring devices, material capacitance, analysis materials, etc., can solve the problems of high design cost, cumbersome data processing, weak anti-interference ability, etc.

Pending Publication Date: 2020-10-27
CHENGDU UNIV OF INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the defects of the existing material detection device, such as complex structure, cumbersome data processing, weak anti-interference ability and high design cost, the patent of the present invention proposes a real-time on-line detection method and device for radio frequency circuits based on the transmission line method, which can realize micro-group detection of materials High-precision non-destructive detection of different changes, and can also be widely used in the detection of reaction solution components in the chemical industry, real-time accurate detection of moisture content in plant seeds, food, beverages, tobacco and knitwear in the agricultural field, with a wide range of applications

Method used

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  • Material tiny dielectric change real-time detection method and device based on radio frequency technology
  • Material tiny dielectric change real-time detection method and device based on radio frequency technology
  • Material tiny dielectric change real-time detection method and device based on radio frequency technology

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Embodiment 1

[0070] Example 1: Design scheme for material detection

[0071] In the embodiment of the present invention, the accurate determination of the changes in the components of ethanol-water mixed solutions with different concentrations is realized. The volume fraction ratio of water in ethanol directly affects the change of the complex dielectric constant of the mixture as a whole, and then affects the S parameter of the circuit. Variations such as amplitude, phase and frequency offset. The material to be tested is an aqueous ethanol solution with a concentration of 5%. Its real part of the dielectric constant ε=69.03 and tanδ=0.182 at normal temperature (25 degrees Celsius), normal pressure, and 5.8GHz. When its volume fraction changes by 1%, its corresponding The real part of the dielectric constant ε=67.41, tanδ=0.198, then the relative change is Δ ε =1.62, Δtan8=0.016, then the corresponding S11 frequency offset can be obtained by similar Figure 6 According to the simulation...

Embodiment 2

[0072] Embodiment 2: The concrete structure of radio frequency circuit

[0073]The detection device is mainly composed of a one-to-four power splitter, a one-to-four combiner, a conformal interdigitated resonant unit and a vector network analyzer. The signal is output by the vector network analyzer, and after entering the 1 / 2 power splitter, it is divided into two signals with equal amplitude and opposite phase. The two signals enter two 1 / 2 power splitters at the same time, and are further divided into four Signals with equal amplitude and opposite phase, then the four-way signals enter the four interdigitated resonance units of the conformal structure at the same time, and interact with the material to be tested placed at this position, and then the four-way signals continue to propagate forward and enter the combined After a multiplexer, one signal output is synthesized, and the scattering parameters of the output signal are detected by a vector network analyzer. Through o...

Embodiment 3

[0074] Embodiment 3: Conformal Interdigitated Resonant Unit Structure

[0075] In order to expand the interaction area between the electromagnetic wave and the test material as much as possible, and at the same time realize the uniformity of the field strength of the electric field in the test material, an interdigitated resonant unit circuit with a conformal structure is designed in the present invention. The number of cross fingers is 3 pairs, the length is 6.2mm, the width is 1mm, the gap is 0.4mm, and the gap is 0.8mm. The circuit is based on a microstrip line structure that can be conformal to very small radii. The amplitude and resonant frequency of S11 change to -34.5dB and 5.81GHz when the resonator is conformal within R=0.02m, and the corresponding amplitude and resonant frequency changes to -34.3dB and 5.805GHz when it is not conformal. The comparison can be The amplitude and resonant frequency of S11 before and after the conformal change are very weak. In addition,...

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Abstract

The invention discloses a material tiny dielectric change real-time detection method and device based on a radio frequency technology. Input signals of a microwave circuit are equally divided into four paths of signals with the same amplitude by a one-to-four power divider; the four paths of signals simultaneously enter four interdigital resonance units, then the four paths of signals continue tobe propagated forwards and simultaneously enter a one-to-four combiner to be mixed, and then the mixed signals are outputted; the output signals are received and processed by a vector network analyzerin real time; a large number of electromagnetic fields are concentrated around the interdigital resonance units; when a to-be-measured material is placed in an electromagnetic field concentration area, electric field distribution around the resonance units can be disturbed, the resonance frequency and attenuation amplitude of the resonance units are changed, so that tiny dielectric property changes of the material can be obtained by measuring scattering parameters of a circuit on the basis of the change of the resonance frequency and attenuation amplitude of the resonance units. With the method and device adopted, high-precision damage-free detection of tiny component changes of the material can be realized, can be popularized and applied to other fields, and have a wide application range.

Description

technical field [0001] The invention belongs to the technical field of design and application of microwave circuits, and in particular relates to a method and device for real-time detection of tiny dielectric changes of materials based on radio frequency technology. Background technique [0002] In the chemical industry, real-time regulation and detection of changes in the composition of reactive materials plays a very important role in the performance indicators and production efficiency of industrial products. For example, during a chemical reaction, the concentration and composition of the reaction solution change in real time as the chemical reaction progresses, requiring real-time regulation and detection. In addition, the real-time detection of small dielectric changes of materials is also widely used in the fields of food, coal, building materials and knitwear. [0003] The common detection methods for the dielectric change of materials mainly include near-infrared a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/22
CPCG01N27/221G01N27/223G01N27/228
Inventor 孙浩然李荣强唐涛
Owner CHENGDU UNIV OF INFORMATION TECH
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