Abstract
A simple fiber sensor to measure angular displacement with high resolution, which is based on whispering gallery mode (WGM) resonance in bent optical fibers, is proposed. The sensor is composed of a single loop formed by loosely tying a knot using single mode fiber. To measure the transmission spectra, a tunable laser and an optic power meter are connected to the two ends of fiber loop, respectively. Significant WGM resonances occur over the investigated wavelength range for all the sensors with different bend radius. The angular-displacement sensitivity is studied in the range from -0.1° to 0.1°. The detection limit of 1.49×10-7 rad can be achieved for the detecting system with the resolution of 1pm. The simple loop-structure fiber sensor has potential application prospect in the field of architecture or bridge building with low detection limit and low cost.
| Original language | English |
|---|---|
| Pages (from-to) | 42-46 |
| Number of pages | 5 |
| Journal | Journal of Beijing Institute of Technology (English Edition) |
| Volume | 23 |
| Issue number | 1 |
| Publication status | Published - Mar 2014 |
Keywords
- Angular displacement
- Optical fiber sensor
- Whispering gallery mode (WGM)