Abstract
A highly-sensitive miniature sensor based on cascaded FPIs and the harmonic Vernier effect is proposed for high-temperature measurement. The package-free sensor is fabricated by only cleaving and splicing single-mode fiber (SMF), suspended core fiber (SCF), and hollow core fiber (HCF). By carefully adjusting the lengths of SCF and HCF, the Vernier effect and harmonic Vernier effect are generated on two sensors built by the same method, respectively. The reflected spectra exhibit distinct characteristics depending on the direction of incident light. Leveraging on the harmonic Vernier effect, the sensor of this type could achieve the highest sensitivity of 109.72 pm/℃ and maintain a maximum temperature fluctuation of only 4.12 ℃ under 800 ℃ without any temperature-sensitive material. In addition, the repeatability has been verified and the hysteresis errors have been analyzed. This miniature sensor exhibits excellent repeatability and stability, making it well-suited for high-temperature measurements in harsh environments.
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