Table 1.
Examples of discrete optical fiber sensor networks based on various specialty fibers for water level monitoring.
| Year/Reference | Interrogation | No. of SUs | Type of SU | Modulation Mechanism |
|---|---|---|---|---|
| 2007/[22] | LED 1 (@ 660 nm) + OPM 2 | 8 | U-shape bending sensor | Intensity |
| 2007/[23] | SLS 3 (@ 632.8 nm) + OPM | 18 | Polished lateral spire sensor | Intensity |
| 2014/[26] | SLS (@ 660 nm) + OPM | 7 | POF segments | Intensity |
| 2015/[27] | LED (@ 660 nm) + OPM | 26 | Engraved grooves in POF | Intensity |
| 2015/[25] | SLS (@ 633 nm) + OPM | 8 | Micro holes in POF | Intensity |
| 2016/[28] | LED (@ 670 nm) + OPM | 10 | Grooves in POF | Intensity |
| 2017/[20] | SLS (@ 653 nm) + OPM | 30 | Race-track helical POF | Intensity |
| 2018/[29] | SLS (@ 635 nm) + OPM | 20 | V-grooves in POF | Intensity |
| 2019/[21] | SLS (@ 635 nm) + OPM | 20 | Multi S-bend POF | Intensity |
| 2020/[24] | SLS (@ 635 nm) + OPM | 6 | Screw-shaped POF | Intensity |
1 LED: light-emitting diode, 2 OPM: optical power meter, 3 SLS: single light source (Laser), and POF: plastic optical fiber.