ELECTROMAGNETIC SCREEN QUALITY EVALUATION METHOD Russian patent published in 2019 - IPC G01R29/08 G01R23/16 

FIELD: physics.

SUBSTANCE: invention relates to shielding from electromagnetic fields and can be used to control efficiency of electromagnetic screening of various devices requiring protection from external fields (proximity fuses of engineering mines, executive devices of radio-controlled mines and reconnaissance and signalling devices, etc.). Method of electromagnetic shield quality assessment consists in that the screen is irradiated from the outside with the primary electromagnetic field, and inside the analysed screen an electromagnetic non-linear reflector is placed and new spectral components are recorded in the reflected secondary field outside the screen. Additionally, reflector is made broadband, and irradiation with the primary field and recording of the secondary electromagnetic field (nonlinearity products) is carried out in a wide frequency range.

EFFECT: high quality of evaluating an electromagnetic shield, especially when examining a screen with large screen attenuation; since the electromagnetic wave emitter and the receiver operate at different frequencies, this provides a deep decoupling of the primary and secondary signals; wherein the integrity of the analysed screen structure is not violated, since passive nonlinear reflector is completely self-contained device.

1 cl, 1 dwg