Abstract: An optical sensor system is adapted for a sensing method using fiber segment interferometry. A sensing element with a thermo-optic coefficient larger than the thermo-optic coefficient of an optical fiber is arranged at a distal end of the fiber.

Abstract: A sensor system includes an optical fiber, a modulable light source, and a photodetector. The optical fiber includes two sensing reflectors and a reference reflector. The optical fiber defines a distal end and a proximal end. A measuring segment is defined between the two sensing reflectors and disposed between the distal end and the proximal end. The light source is disposed at the proximal end and configured to emit light with a coherence length longer than the maximum distance between the sensing reflectors and the reference reflector.