Three-port technology based coaxial material microwave real-time detection device

Abstract

The invention belongs to the technical field of microwave applications, and concretely provides a three-port technology based coaxial material microwave real-time detection device. The device includesa microwave detection waveguide and three microwave transmission waveguides with the same structure. The microwave detection waveguide is a circular waveguide and is used for accommodating a to-be-detected coaxial material to pass through and forming a coaxial transmission line structure with the to-be-detected coaxial material. One of the microwave transmission waveguides is connected to the middle of the microwave detection waveguide through a mode converter and is used as an input port of the detection device. The other two microwave transmission waveguides are respectively connected to the two ends of the microwave detection waveguide through mode converters and are used as output ports of the detection device. The detection adopts the two output ends, and the distance from the inputport to the two output ports is equal. The detection device can discriminate the state of the coaxial material in real time through the change of an S parameter, can effectively improve the measurement accuracy and reduce the misjudgment rate, and can realize nondestructive detection and high accuracy detection of defects of the coaxial material.

Description

technical field [0001] The invention belongs to the field of microwave application technology, in particular to a system for detecting defects and differences of coaxial materials by a microwave three-port device, in particular to a microwave real-time detection device for coaxial materials based on three-port technology. Background technique [0002] In the current communication system, the coaxial transmission line has been widely used because of its advantages of low loss, flexibility, and wide frequency bandwidth. At present, various coaxial cables based on new technologies emerge in an endless stream, such as flexible coaxial cables based on foamed polyethylene processing and leakage antennas based on them, which have been widely used in indoor, underground, and rail transit communications; but due to technical reasons , In the production process, especially in the foaming process, the foaming system often has instability problems, resulting in various defects in the fo...

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Problems solved by technology

For the detection method using X-rays, the application number CN201620546600.2 "A Portable Cable Internal Inspection Device" discloses the use of X-rays to detect internal defects, but due to the application of X-rays, its safety and conditions of use Limited and costly

For defect detection using microwave, it has the advantages of internal detection and high safety. For example, the application number 201611191101.7 "A real-time online detection device for cables based on microwave technology" discloses a cable based on microwave transmission lines. Real-time detection scheme, this scheme establishes a good cable standard by measuring and comparing the S parameters of different cables, and judges the quality of the cable based on this; but after practice and factory application feedback, this scheme has problems such as high detection misjudgment rate , It is difficult to judge small changes, etc. In particular, due to the instability in the measurement, the difference between the front and rear of the same cable cannot be well reflected

[0004] To sum up, the methods disclosed in the above-mentioned prior art can perform a certain detection for the measurement of the foam cable, but they all have a certain degree of disadvantages

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