Abstract
In this paper, an optical strain sensor with automatic temperature compensation is presented. The strain sensitivity is 198.547 pm/με, which is nearly 2.8 times that of the latest generation multilayer optical fiber strain sensor based on mode field diameter (70.77 pm/με). This increase in sensitivity is due to the particular structure within which the optical fiber sensor is installed. This structure amplifies the applied strain and transfers it to the optical fiber. In order to compensate for the temperature effects, employing a negative temperature expansion (NTE) element is essential. In addition, applying an initial strain is required to adjust the system performance. As a result, the entire sensor system is automatically compensated for the temperature with less than 1 percent error.
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