A method of determining a friction coefficient \u03bc in a contact area of a tire on a road. The system can include a first liquid composition and a second liquid composition. The interior of the enclosure is divided in the front-rear direction by the connection substrate. The exposed porous dielectric with the aqueous film is exposed to an ambient containing a mixture comprising at least one silylation agent and dense CO2, resulting in the restoration and preservation of the pristine properties of the porous dielectric. , and thereby to find possible failures, solve problems, and monitor quality parameters of optical signals in real time, and improve reliability of the optical signal transmission.