Abstract
This paper has proposed and experimentally demonstrated an integrated Co2+-doped microfiber Bragg grating sensor (Co-MFBGS) that can measure the surrounding liquid refractive index (LRI) and liquid flow rate (LFR) simultaneously. The Co-MFBGS provides well-defined resonant modes of core and cladding in the reflection spectrum. By monitoring the wavelength of the cladding mode, the LRI can be measured; meanwhile, by monitoring the wavelength of the core mode caused by the heat exchange, the LFR can be measured. The LRI and LFR can be distinguished by the wavelength separation between cladding mode and core mode. The experimental results show that in aqueous glycerin solution, the maximum measurement sensitivity for LRI detection is −7.85 nm/RIU (refractive index unit), and the LFR sensitivity is −1.93 nm/(μL/s) at a flow rate of 0.21 μL/s.
Highlights
The sensing characteristics of the proposed 16.7 μm diameter Co-MFBGS for temperature (20–140 °C), surrounding Liquid refractive index (LRI) (1.32–1.44 RIU) and liquid flow rate (LFR) (0–0.98 μL/s) changes have been tested as described
Wavelength interval change between λa and λb of the Co-MFBGS is shown in Figure 3a, which is clearly showing that λa–b is almost free from temperature perturbations
This paper has presented an integrated Co-MFBGS, which can measure the LRI and LFR simultaneously
Summary
Various microfiber-based LRI sensors have been proposed, as they have high sensitivity, a robust structure, and have many applications for biosensors, chemical sensors, etc. Previous scientific research studies include fiber-optic interferometers [3,10,18], tilted fiber Bragg gratings (TFBGs) [14], long-period gratings (LPGs) [15], and many kinds of microfiber Bragg gratings (MFBGs) [1,19]. All of these previous studies bring us many useful microfiber-based sensors with specific designs
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