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Investigation of the higher-order harmonics of internal vernier envelopes on the sensitivity enhancement of the integrated all-fiber cascade fabry–perot strain and temperature sensor

Mirzaei, M ; Sharif University of Technology | 2023

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  1. Type of Document: Article
  2. DOI: 10.1016/j.yofte.2023.103437
  3. Publisher: Academic Press Inc , 2023
  4. Abstract:
  5. Fiber optic sensors have emerged as a promising technology for precise measurements in various applications. In this study, we propose an integrated all-fiber Cascade Fabry–Perot (CFP) sensor that uses the harmonic Vernier effect to enhance its sensitivity. The sensor consists of a Silica Capillary Tube (SCT) fusion spliced to a Single-Mode Fiber (SMF), and its cavity length is optimized to locate Vernier's internal envelopes for three different Vernier harmonic orders within the spectral range of 1500 nm–1600 nm. Three CFPs were fabricated and utilized as strain and temperature sensors. By analyzing and tracing Vernier's internal envelopes, we experimentally demonstrated that sensitivity was improved, with the second harmonic order Vernier internal envelope exhibiting higher sensitivity than the lower Vernier harmonic orders. As a result, using the harmonic Vernier technique, we increased the temperature and strain sensitivity of the fiber optic Fabry–Perot sensor to 359.4 pm/°C and -25.1 pm/με, respectively. The proposed CFP sensor provides a simple, cost-effective, and reliable solution for various sensing applications that require high sensitivity and accuracy. © 2023 Elsevier Inc
  6. Keywords:
  7. Cascade fabry–perot cavity ; Harmonic vernier effect ; Internal vernier envelope ; Sensitivity enhancement
  8. Source: Optical Fiber Technology ; Volume 80 , 2023 ; 10685200 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S1068520023002171