研究目的
To propose and verify a highly sensitive vector curvature sensor based on two juxtaposed fiber Michelson interferometers with Vernier-like effect.
研究成果
The proposed Vernier-like effect structure based on two juxtaposed fiber Michelson interferometers demonstrated ultra-high sensitivity for vector curvature measurement. The curvature sensitivities of the structure are about 53nm/m-1 and -57nm/m-1 at the bending directions of +x and –x, respectively.
研究不足
The spectral width of the source limits the measurement range as the envelope will drift out of the spectral range as the curvature increases.
1：Experimental Design and Method Selection:
The proposed configuration consists of two juxtaposed MIs made up of a triple-core fiber (TCF) connected with a dual-side-hole fiber (DSHF). The centric core of the TCF is aligned with the core of the DSHF, and the two eccentric cores of the TCF are respectively aligned with the two air holes of the DSHF.
2：Sample Selection and Data Sources:
The TCF length was
3：8 cm and the DSHF length was 87 μm. List of Experimental Equipment and Materials:
A broadband Super-luminescent Emitting Diodes (SLED) with spectral range of 1480 nm-1640 nm was used as a light source, and the reflected light was detected by OSA (Yokogawa AQ6370C).
4：Experimental Procedures and Operational Workflow:
The TCF was spliced to a conventional SMF with alignment of the core of SMF to one eccentric core of TCF. Then the other end of TCF was spliced to a DSHF. The DSHF was cut off at a distance of a few hundred microns from the TCF-DSHF junction to form a reflective surface. The TCF near SMF-TCF splice junction was tapered by means of heating and stretching in a flame.
5：Data Analysis Methods:
The interference spectrum was monitored with an OSA, and the Fourier transformation of the spectrum was analyzed.
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