Packaged sensors and harsh environment systems with packaged sensors

A method of forming a sensing cable package comprising:

• contacting a first optical fiber and a second optical fiber to form an interconnection;
• providing a tubing with an aperture at the vicinity of the intersection and the tubing comprising one or more noble metals, wherein the tubing circumferentially surrounds at least a length of the first and second optical fibers and the interconnection;
• disposing a bonding material through the aperture into the tubing to span across at least part of the circumferential surfaces of the first and second fibers along the interconnection;
• and
• setting the bonding material to form a rigid interconnection of the first and second fibers such that fibers on each side of the bonding material can freely move towards opposite directions as a result of thermal expansion.

A gasification system comprising:

• a gasifier unit and an RSC;
• and
• a sensor cable package at least in part disposed within the gasification system, comprising:
• a sapphire optical fiber sensing cable comprising a core having an index of refraction n1, wherein the core comprises at least one Bragg grating structure;
• and
• a sapphire nanoporous cladding along a circumferential surface of the fiber comprising nanopores filled with a medium;
• and
• a silica optical fiber abutting the sapphire optical fiber, wherein abutting portions of the sapphire and silica optical fibers are disposed within a tubing comprising one or more noble metals and an aperture on the tubing at the vicinity of the intersection, wherein a bonding material is disposed within the tubing through the aperture spanning across the abutting portions around at least a part of the circumferential surfaces and bonding in place the sapphire fiber and the silica fiber such that fibers on each side of the bonding material can freely move towards opposite directions as a result of thermal expansion, wherein the tubing is hermetically sealed and the at least one Bragg grating structure is disposed within the tubing.