DEVICE FOR MEASURING INDUCED CURRENT IN GLOW BRIDGE OF ELECTRIC INITIATION MEANS Russian patent published in 2024 - IPC G01R19/00 

FIELD: electrical measuring equipment.

SUBSTANCE: invention relates to electrical measurement equipment, namely to measurement of induced current in glow bridge of electric initiation means (EIM), which is part of objects, when they are tested for action of electromagnetic fields of different origin. Device consists of a multichannel optical interrogator, an electric field strength meter, a passive optical N-channel splitter and an induced current sensor. Induced current sensor is a Bragg grating formed in the core of a single-mode optical fibre with diameter of 50 mcm with a metal film applied on top, which is the EIM filament bridge, and has resistance identical to that of EIM filament bridge. Induced current sensors are connected to the interrogator through optical splitters, the resonance frequencies of which are spread along the spectrum in range from 1,460 nm to 1,620 nm. Total length of fibre-optic connections from interrogator to sensor does not exceed 50 metres. Induced current sensors are installed in housings of quenched standard EIM, which are filled with heat-insulating material. Device has an automated workstation with software for recording and processing results with the possibility of converting the value of the shift of the Bragg resonance of the grating into the amplitude of the induced current based on the calibration curve.

EFFECT: high accuracy, as well as reduced sensitivity threshold for measuring values of induced current flowing in an EIM filament bridge, when testing objects for explosion safety when exposed to electromagnetic fields of various origins.

1 cl, 2 dwg