Electromagnetic pulse radiation field test probe, test system and test method

Abstract

The invention discloses an electromagnetic pulse radiation field test probe, a test system and a test method. The probe comprises an electrically small monopole antenna, a metal shielding shell and anelectro-optical conversion circuit; one end of the electrically small monopole antenna is positioned outside the metal shielding shell; the other end of the electrically small monopole antenna penetrates through an antenna lead-in hole in the metal shielding shell and then enters the metal shielding shell; and the end part of the electrically small monopole antenna entering the metal shielding shell is electrically connected with the signal input end of the electro-optical conversion circuit; and the signal output end of the electro-optical conversion circuit is the optical signal output endof the test probe. The probe has the advantages of wide working frequency range, large dynamic range, adjustable sensitivity, simple circuit structure, easiness in miniaturization and the like.

Description

Technical field [0001] The invention relates to the technical field of electromagnetic signal detection, in particular to an electromagnetic pulse radiation field test probe, a test system and a test method. Background technique [0002] Electromagnetic pulse has the characteristics of fast rising edge, high amplitude, and narrow pulse width in the time domain. In the frequency domain, it covers a wide frequency band, which makes various electronic devices susceptible to electromagnetic pulses. Therefore, the study of electromagnetic pulse has become particularly important for the electromagnetic compatibility test of electronic equipment. In the test, lightning electromagnetic pulse, electrostatic electromagnetic pulse, nuclear electromagnetic pulse and ultra-wideband electromagnetic pulse are often used as electromagnetic pulse sources, using field forming devices The electromagnetic pulse field is radiated. By analyzing the time-domain waveform of the electromagnetic pulse rad...

AI Technical Summary

Problems solved by technology

Since the frequency range covered by the antenna itself is limited, signal distortion will inevitably occur in the ultra-wideband electromagnetic pulse test, and the field waveform cannot be truly restored, and larger-sized antennas will also produce field distortion effects; in addition, using Coaxial cable for signal transmission will cause itself to be affected by strong electromagnetic pulse field, thus introducing external electromagnetic interference

Therefore, the existing electromagnetic pulse radiation field test devices all use optical fiber as the carrier of signal transmission, which involves the modulation of electrical and optical signals. The core technical problem is to realize the acquisition and conversion of electric field signals in an ultra-wide frequency band. and modulation, and finally realize the undistorted test of the electromagnetic pulse radiation field. The previous research mainly used the electric small antenna to sense the electric field signal, and then realized the optical signal by the impedance transformation circuit, follower circuit, constant current circuit or amplification drive circuit and electro-optic conversion circuit. Output, due to the complex circuit structure, especially the impedance transformation circuit and the amplification drive circuit will seriously limit the signal transmission bandwidth, resulting in the loss of high frequency components

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