INFRARED FIBRE-OPTIC SYSTEM FOR MONITORING DISSOLVED GASES AND MOISTURE IN TRANSFORMER OIL Russian patent published in 2022 - IPC G01N21/3504 

FIELD: measuring equipment.

SUBSTANCE: invention relates to measuring equipment based on fibre-optic channels and is intended for continuous monitoring of the content of moisture and dissolved gases in insulating oil. The claimed infrared fibre-optic system for monitoring dissolved gases and moisture in transformer oil includes a wide-range infrared emission source, a fibre-optic channel for optical signal delivery, optical filters, and emission receivers. The fibre-optic channel is therein made in the form of two, transmitting and receiving, fibre assemblies, wherein each of said assemblies comprises an equal number of optical fibres of two types with a diameter of 100 mcm and a length of 80 cm in an amount of no more than 1,750 in each assembly. Fibres of the first type are therein transparent in the 0.7 to 2.5 mcm range and are made of quartz glass, and fibres of the second type are transparent in the 2.5 to 6.0 mcm range and are made of silver halide crystals or chalcogenide glasses; installed on one end whereof is an attenuated total reflectance cone (ATR cone) transparent in the 1.0 to 6.0 mcm range, in direct contact with the measured medium, and connected by the base to the ends of the transmitting and receiving fibre-optic assemblies, the other ends whereof are connected with the infrared emission source and narrow-band optical filters coupled with the infrared photodetectors, for the purpose whereof the end of the receiving assembly is divided into seven parts with an equal number of optical fibres in each part, wherein the transparency of the type of fibre corresponds to the transparency of the optical filter.

EFFECT: implementation of a method for infrared spectroscopy using fibre-optic emission delivery channels, allowing for continuous monitoring of the concentration of substances with an up to 0.1% vol. accuracy without sampling in conditions of strong electromagnetic interference.

1 cl, 1 dwg