Liquid or solid powder substance dielectric coefficient test device, and the test and calculation method

Abstract

The invention relates to a testing device for dielectric coefficient of liquid or solid powder matter and testing and calculating methods, characterized in that in the device microwave signal source (1) is connected to the inputting end of slotting coaxial measurement segment (4) by circulator (2) and double directional coupler (3); after it passes through tested matter reflecting wave Pr and transmitting wave Pt are generated; reflecting wave Pr is transferred to matched load (6) by the double directional coupler (3) and the circulator (2); transmitting wave Pt is sent to the matched load (6) by directional coupler (5); incident wave Pi and reflecting wave Pr coupled by the double directional coupler (3) and transmitting wave Pt coupled by directional coupler (5) sent to double-channel power meter (7) respectively at two ends of slotting coaxial measurement segment (4) are sent to computer (8) finally so as to form an integration. It is tested and calculated by the following method. Tested matter is set in the measuring container (12) and amplitudes of reflection coefficient S11 and transmission coefficient S21 are read in computer (8) as testing value for use. Based on testing result dielectric coefficient of tested matter is searched by finite value algorithm combined with genetic algorithm.

Description

technical field [0001] The invention relates to a device for measuring the dielectric coefficient of liquid or solid powder materials and its testing and calculation method, which is especially suitable for testing the dielectric coefficient of liquid or solid powder materials under high-power microwaves, and belongs to the field of testing the dielectric coefficient of materials. Background technique [0002] The dielectric coefficient of matter has always been a fundamental and important issue in the study of the interaction between matter and microwaves. Knowing the dielectric coefficient of various substances can further understand its absorption and reflection of microwaves. The traditional resonant cavity method is difficult to meet the requirements of broadband on-line measurement due to the narrow measurement frequency band of a single resonant cavity; the traditional transmission line method uses a standard coaxial line or waveguide, which has high requirements on t...

AI Technical Summary

Problems solved by technology

However, to measure the amplitude and phase of the reflection coefficient at the same time, an expensive microwave vector network analyzer must be used, and it is often difficult to accurately measure the phase of the reflection coefficient when studying the dielectric properties of materials under the action of high-power microwaves

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