Abstract
High-Sensitivity Sensor Fabricated on the Basis of Single-Mode Fiber Loop Using Frequency-Sweeping-Generated Ringing Effect
Highlights
In modern medical and biological fields, there is a need to detect, measure, and determine minute changes in the human body, microfluids, or other liquid environments, which require the development of safe high-precision sensing techniques.Optical devices, fiber devices, have been widely used for sensing, owing to the fact that they are ultrasensitive to outside changes in anti-electromagnetic interference, corrosion resistant, capable of covering long distances, multiplexible, small, low cost, and light weight
When we put the bare fiber into the fluid that we wanted to examine, the total optical loss will vary because the fluid changes the evanescent field of the resonator
To detect the loss changes quantitatively, we propose the use of exponential fitting to link the lowest points of the ringing profiles A1A2···An as shown in Fig. 3, and we can find the time tB, which conform to |1 − tB| = |1 − tA| × e−1
Summary
Fiber devices, have been widely used for sensing, owing to the fact that they are ultrasensitive to outside changes in anti-electromagnetic interference, corrosion resistant, capable of covering long distances, multiplexible, small, low cost, and light weight. They are suitable for use in the medical and biological fields because they have little impact on detection media. Optical-ring-resonator-based sensor.(4) all these devices have problems Despite their high sensitivity (5.23×10–6 RIU), Fiber-Bragg-grating-based sensing heads are delicate optical devices, which are difficult to manipulate and are damaged. These abovementioned defects make them difficult to apply to practical circumstances
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