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A Sensing Peak Identification Method for Fiber Extrinsic Fabry⁻Perot Interferometric Refractive Index Sensing.
Bowen Yang1, Biyao Yang2, Ji Zhang3
1School of Instrumentation and Optoelectronic Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, China. yangbw@buaa.edu.cn.
Sensors (Basel, Switzerland)
|January 2, 2019
Summary
A new method accurately identifies sensing peaks for refractive index (RI) sensing. This technique enhances measurement range and accuracy in extrinsic Fabry–Perot interferometer (EFPI) sensors.
Area of Science:
- Optics and Photonics
- Sensing Technologies
Background:
- Refractive index (RI) sensing is crucial for various applications.
- Accurate and reliable RI measurement methods are needed.
- Existing methods may have limitations in range or accuracy.
Purpose of the Study:
- To propose a novel sensing peak identification method for high-accuracy RI sensing.
- To improve the measurement range and performance of extrinsic Fabry–Perot interferometer (EFPI) sensors.
- To demonstrate a simple yet effective approach for continuous RI monitoring.
Main Methods:
- Developed a method using interference maximum intensity to identify sensing peaks.
- Fabricated an EFPI sensor using the large lateral offset splicing technique.
- Continuously tracked the sensing peak during RI changes.
Main Results:
- The proposed method achieved high measurement accuracy and simple computation.
- The EFPI sensor demonstrated a measurement range at least 6 times larger than traditional wavelength tracking methods.
- The largest measurement error in the RI range of 1.346 to 1.388 was -4.47 × 10-4.
Conclusions:
- The novel sensing peak identification method offers superior performance for RI sensing.
- This technique is vital for applications requiring precise RI, concentration, and density measurements.
- The EFPI sensor with the proposed method shows significant potential for advanced sensing.
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