Optical sensor for the measurement of physical parameters in harsh environments and methods of making and using the same

An optoelectronic system for measuring physical parameters comprising:

• an optical sensor comprising:
• a first Fabry-Pérot interferometer arranged to receive a first portion of a combined light wherein the first Fabry-Pérot interferometer is exposed to temperature and a physical parameter of interest;
• and
• a second Fabry-Pérot interferometer arranged to receive a second portion of the combined light wherein the second Fabry-Pérot interferometer is exposed to the temperature and not exposed to the physical parameter of interest;
• an interrogator in optical communication with the optical sensor, the interrogator comprising:
• a first narrow band light source with a first peak frequency;
• a second narrow band light source with a second peak frequency different from the first peak frequency;
• a coupler arranged to couple the first narrow band light source with the second narrow band light source into the combined light, wherein both the first portion of the combined light and the second portion of the combined light comprise light from the first narrow band light source and the second narrow band light source;
• a first Fizeau interferometer arranged to receive the first portion of the combined light reflected from a first cavity of the first Fabry-Pérot interferometer through an optical path comprising a lens or a mirror to a first optical detector;
• a second Fizeau interferometer arranged to receive the second portion of the combined light reflected from a second cavity of the second Fabry-Pérot interferometer through an optical path;
• and
• a processor arranged to analyze the data received by the first optical detector and second optical detector and calculate a value for temperature and the physical parameter of interest.