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An optical fiber sensor is proposed and experimentally demonstrated for simultaneous measurement of high temperature and transverse load. The sensor is designed by splicing a silica capillary tube (SCT) to a single-mode fiber (SMF) and then heating the SCT to form an air bubble. SCT simultaneously functions as a Fabry Perot (F-P) microcavity and an anti-resonant reflection waveguide. These sensing mechanisms lead to high contrast sensitivity values of temperature and transverse load (1.89pm&#x002F;&#x00B0;C,190.48pm&#x002F;N and 24.93pm&#x002F;&#x00B0;C, 16.68pm&#x002F;N). Remarkably, the temperature sensitivity of this sensor is eleven times higher than that of the current fiber-tip micro-cavity (2.1 pm&#x002F;&#x00B0;C). The sensor is also more advantageous in quantitative production and practical application due to its low cost, ease of fabrication, good mechanical strength, and convenient reflection probe.

Compact Optical Fiber Sensor Based on Silica Capillary Tube for Simultaneous High Temperature and Transverse Load Measurement