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Open-ended coaxial probe and method for measuring dielectric spectrum property of biological tissues

A biological tissue and coaxial probe technology, which is used in the high-frequency band to measure the dielectric properties of biological tissue probes and calibrations, in the field of soft tissue with irregular shapes and small volumes, can solve problems such as poor stability and measurement result errors, and achieve Effects of reduced restrictions, convenient measurement, and high measurement accuracy

Inactive Publication Date: 2012-06-20
FOURTH MILITARY MEDICAL UNIVERSITY
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  • Description
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Problems solved by technology

For the latter, due to the possible gap between the probe and the contact surface of the material, and the dependence of the Load state on the accuracy of the calibration material information, the stability of the calibration measurement may be poor, causing large errors in the measurement results.

Method used

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  • Open-ended coaxial probe and method for measuring dielectric spectrum property of biological tissues
  • Open-ended coaxial probe and method for measuring dielectric spectrum property of biological tissues
  • Open-ended coaxial probe and method for measuring dielectric spectrum property of biological tissues

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Embodiment Construction

[0037] The working principle of the probe is: according to the transmission line theory, when the coaxial probe terminal is attached to the tissue to be tested, the entire structure is converted into an equivalent circuit, and the reflection coefficient modulus |Γ| Convert it into the dielectric coefficient of the biological tissue to be measured. Its relationship is as follows:

[0038]

[0039]

[0040] In the formula, Z 0 =50Ω is the characteristic impedance of the coaxial probe, ω is the angular frequency, C f Indicates the stray capacitance at the edge of the coaxial probe which is not associated with the substance to be measured and is a constant. C 0 Indicates the equivalent capacitance when the probe is open.

[0041] According to this principle, the C f and C 0 Find out. Then select a suitable tissue to be measured for measurement, and substitute the measurement results into the relational formula to calculate the dielectric coefficient of the tissue to ...

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Abstract

The invention provides an open-ended coaxial probe and connection cable for measuring a dielectric spectrum property of biological tissues, and a corresponding instrument calibration method according to high-precision and wide-broadband measurement requirements on the dielectric property of in-vitro or in-vivo biological active tissues which are soft, small in volume and irregular in appearance. The open-ended coaxial probe comprises an inner conductor and an outer conductor which are concentrically arranged; the ratio of the radius of the inner conductor to the radius of the outer conductor is 3: 10; polytetrafluoroethylene is filled between the inner conductor and the outer conductor and a plating layer is arranged on the surface of the outer conductor. The connection cable is mainly composed of an N-type connector and a coaxial cable. The probe is calibrated by utilizing a phase cancellation method and is used for measuring the dielectric property of the biological active tissues at 1-200 MHz. Meanwhile, in order to increase the reliability of measured data, a calibration box which is used with the open-ended coaxial probe is provided; and a method for measuring the dielectric property of the biological tissues can be carried out by using the open-ended coaxial probe.

Description

technical field [0001] The invention relates to the field of measuring the dielectric properties of biological tissues, in particular to a probe and a calibration method for measuring the dielectric properties of biological tissues in the high-frequency band (1 MHz to 200 MHz), and is especially suitable for small-volume soft tissues with irregular shapes in vitro measurement, with high measurement accuracy. At the same time, it has a good application prospect for measuring the dielectric properties of in vivo tissue. Background technique [0002] The dielectric properties of biological tissue are intrinsic properties of biological substances and are the basis for the response properties of tissues to applied electromagnetic fields. The complex relative permittivity is usually used as a parameter to describe its dielectric properties. Its expression is: [0003] ϵ r * = ϵ r ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26G01R27/02G01R1/067
Inventor 董秀珍史学涛张亮尤富生付峰季振宇刘锐岗漆家学霍旭阳
Owner FOURTH MILITARY MEDICAL UNIVERSITY
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