eDAS™ - Enhanced Distributed Acoustic Sensing Fiber
Enhanced Distributed Acoustic Sensing Fiber (eDAS™) provides continuously distributed reflection points along the length of an optical fiber to improve the level of back scattered signal, substantially above the Rayleigh noise floor.
The enhancement technique can be applied to any type of optical fiber with an acrylate, high temperature acrylate or polyimide coating, enabling access to applications at up to 85oC, 150oC or 300oC respectively. The technique is applicable to standard single-mode (SM) telecoms fibers, such as G.652 and G.657, as well as specialty optical fibers including pure silica core fibers for hydrogen rich environments.
Advantages:
- Enhanced SNR for distributed sensing techniques
- Thermally stable to 300oC
- Hydrogen tolerant design available
- Enables reduced seismic vibrator costs
- Longer fiber sensing lengths
- Higher data fidelity
- Faster acquisition times
Typical Applications:
- Distributed Acoustic Sensing (DAS)
- Oil & Gas sensing: flow monitoring, microseismic & event detection and borehole seismic
- Pipeline monitoring
- Structural Health Monitoring (SHM)
Comparison
| Low Temperature eDAS | Mid Temperature eDAS | High Temperature eDAS | |
|---|---|---|---|
| Enhanced (dB) [above Rayleigh scatter level] | 3 - 15 | 3 - 15 | 3 - 15 |
| Fiber Types | G.652 / G.657 (others upon request) | SM1250(10.4/125)HT, SM1250SC(9/125)HT (other upon request) | SM1250SC(9/125)P (other upon request) |
| Reflector Spacing (m) | 0.5, 1, 5 (other upon request) | 0.5, 1, 5 (other upon request) | 0.5, 1, 5 (other upon request) |
| Cladding Diameter (μm) | 125 (80μm on request) | 125 (80μm on request) | 125 (80μm on request) |
| Coating Diameter (μm) | 245 | 245 | 155 |
| Coating Type | Acrylate | High Temperature Acrylate | Polyimide |
| Operating Temperature | 85 | 150 | 300 |
Specifications
Product Variants Explained
Low Temperature eDAS | Ideal for -55oC to +85oC and long-range applications |
Mid Temperature eDAS | Suitable for applications up to +150°C |
High Temperature eDAS | Suitable for applications up to +300°C |
