Abstract
Abstract A method for precise measurement of the liquid-level by using a fiber loop ring-down technique incorporating a short section of etched fiber is proposed and experimentally demonstrated. The change of liquid-level is obtained by recording the ring-down time τ of light in the fiber loop. The experimental results show that the liquid-level has a well defined linear relationship with the inverse of τ over the range of 1 cm; the relative standard deviation of τ is about 0.21% and correspondingly the least detectable liquid-level change is about 4 μm by using an etched fiber with diameter of 25.1 μm. Moreover, this method has low temperature cross-sensitivity when the refractive index of liquid is higher than that of the fiber cladding, so it can be employed for liquid-level measurement with high resolution.
| Original language | English |
|---|---|
| Article number | 20001 |
| Pages (from-to) | 30-34 |
| Number of pages | 5 |
| Journal | Optics Communications |
| Volume | 351 |
| DOIs | |
| State | Published - 1 Oct 2015 |
Keywords
- Fiber loop ring-down technique
- Liquid-level measurement
- Optical-fiber sensors