Microwave sensor-based novel high-accuracy dielectric constant test system

Abstract

The invention discloses a microwave sensor-based novel high-accuracy dielectric constant test system. The microwave sensor-based novel high-accuracy dielectric constant test system comprises a wide-bandwidth signal sweeping frequency source, a differential sensor, a data conversion module and a data storage module. Since a reference resonator and a measurement resonator of the differential sensorare used for placing tested substances with different dielectric constants, frequency difference exists between two paths of power signals which are output, output signals of the two resonators are connected to the data conversion module, and quantitative relative frequency difference corresponding to a voltage peak deviation signal is finally obtained; and since the frequency difference and the quantitative voltage peak deviation signals are in one-to-one correspondence, the frequency difference and dielectric constants are in one-to-one correspondence, and thus, the dielectric constant of ato-be-measured medium is converted according to a voltage signal. By the microwave sensor-based novel high-accuracy dielectric constant test system, the characteristic that an existing sensor needs avector network analyzer to measure the to-be-measured sample to cause inconvenience is overcome, and the dielectric constant of the tested substance can be conveniently, rapidly and accurately obtained by the system without the vector network analyzer.

Description

technical field [0001] The invention belongs to the field of microwave and radio frequency technology, and relates to a broadband frequency sweep source, a microwave resonator, a frequency and phase discrimination radio frequency circuit and a digital data storage circuit, in particular to a substrate integrated waveguide (substrate integrated waveguide-SIW) structure-based complementary The open-loop resonator (complementary split-ring resonator—CSRR) is a new type of microwave sensor and a high-precision radio frequency discrimination circuit for measuring the dielectric constant and permeability of magnetic media materials. Background technique [0002] As one of the important physical properties reflecting its electromagnetic properties, the permittivity of matter is an important link between matter and electromagnetic fields. Therefore, the study of permittivity is important in scientific research, industrial applications, biomedicine and national defense security It ha...

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Problems solved by technology

In addition, the existing microwave sensor measurement basically does not consider the influence of external factors, and environmental factors (temperature, humidity, etc.) are the main factors affecting sensor measurement, and the measurement error caused by environmental factors in some occasions cannot be ignored

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