Abstract
We demonstrate a highly sensitive Fabry–Perot interferometer bending sensor based on vernier effect. The sensor device consists of two cascaded fabry-Perot cavities, one is an air-cavity formed by a section of hollow core fiber spliced with single-mode fiber, and the other is formed by two mirrors written in single-mode fiber by femtosecond laser. By accurately controlling the cavity length of the Fabry–Perot interferometer in single mode fiber, achieved by using femtosecond laser micromachining platform, a large and controllable amplification factor can be obtained. The bending sensitivity of our device is ∼52.877 nm/m−1. Such a device is simple in structure, easy in fabrication and stable in operation.
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