Patent ID: 11959811
Assignee: SSAB ENTERPRISES, LLC
Field: Measurement (Instruments)
Classification: CPC G  C  F  H | IPC C  F  G  H

Claim 20:
21. A temperature sensor comprising:
a sapphire optical fiber structured to produce a thermal emission in response to exposure to a heated material;
a spectrometer coupled to the sapphire optical fiber and configured to generate a radiation spectrum based on the thermal emission;
a first alumina layer proximate the optical fiber, the first alumina layer comprising a nanoporous material; and
a second alumina layer proximate the first alumina layer, the second alumina layer being thicker than the first alumina layer,
wherein an air gap is included around a distal end of the sapphire optical fiber, the air gap separating the distal end the sapphire optical fiber from a distal end of the first alumina layer.