Near field probe used for detecting electromagnetic interference radiation performance and application method thereof

Abstract

The invention provides a near field probe used for detecting electromagnetic interference radiation performance. The near field probe used for detecting electromagnetic interference radiation performance comprises an electric field/magnetic field sensor, a photoelectricity conversion module and optical fibers, the electric field/magnetic field sensor comprises a three-hole optical fiber inserting core, three electric light/magnetic light crystals with different polarization directions, and a protective sleeve, three optical fibers drawn from the photoelectricity conversion module are respectively connected with the three electric light/magnetic light crystals with different polarization directions through the three-hole optical fiber inserting core, and the photoelectricity conversion module comprises a laser device, a 1*3 optical fiber beam splitter, three photoelectricity detectors, three optical fiber circulators, three optical polarization controllers and three radiofrequency output interfaces. The invention further provides an application method of the near field probe used for detecting electromagnetic interference radiation performance. The near field probe used for detecting electromagnetic interference radiation performance and the application method of the near field probe used for detecting electromagnetic interference radiation performance have the advantages that a circumscribed light source and the photoelectricity detector are unnecessary, a traditional radiofrequency output interface is used for outputting, measuring and application methods are compatible with an existing electromagnetic interference measuring system, and an electricity probe can be directly replaced to conduct electromagnetic interference test.

Description

technical field [0001] The invention relates to a near-field probe for detecting electromagnetic interference radiation performance and a use method thereof, belonging to the field of electromagnetic field near-field measurement. Background technique [0002] Electromagnetic interference is an important content in the field of electromagnetic compatibility. With the increasing main frequency of electronic products, increasing wiring density and the use of multi-level and ground split technology, there are a lot of radiation interference on the circuit board. In order to solve the electromagnetic interference problem of the product from the design source, it is necessary to measure the spatial distribution of the electromagnetic interference of the circuit board, which requires the use of the near-field measurement technology of the electromagnetic field. Traditional near-field probes mostly use electrical methods, which have defects in bandwidth, anti-interference ability, a...

AI Technical Summary

Problems solved by technology

However, the current problem of this technology is that the structure of the sensing area at the front end of the probe is complex, there are many unstable factors, and the measurement uncertainty is large; an external laser and photodetector are required, and the compatibility with the existing near-field measurement system is poor.

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