How many cores should be spliced in a temperature-measuring optical cable
Temperature-measuring optical cables typically use single-mode fibers, with up to 4 channels per cable and up to 20 fiber Bragg gratings (FBGs) per channel, which are spliced individually using fusion splicing.
Fiber Configuration and Splicing
Temperature-measuring optical cables often employ single-mode fibers (SMF), which are ideal for high-precision sensing due to low attenuation and high sensitivity . In systems using fiber Bragg gratings (FBGs), a single fiber can host multiple gratings along its length, allowing multiplexing of temperature sensors. According to typical specifications, a single fiber channel can accommodate up to 20 FBGs, and a sensor cable may include up to 4 channels, effectively allowing multiple cores to be spliced and monitored .
Fusion Splicing Method
The standard method for joining optical fibers in these cables is fusion splicing, which aligns and fuses the fiber ends using an electric arc . This ensures minimal optical loss and high mechanical strength. Each fiber core is spliced individually, and the splice region is protected with a splice protector. Fusion splicing is preferred over mechanical splicing or connectors because it provides lower insertion loss, higher reliability, and better long-term stability, which is critical for accurate temperature measurements .
Practical Considerations
- Number of cores: While the physical fiber may be single-core, multiple fibers (channels) can be bundled in a single cable, each carrying multiple FBGs.
- Multiplexing: FBGs allow multiple temperature points to be measured along a single fiber, reducing the need for multiple physical cores.
- Cable protection: After splicing, the bare fiber is shielded to prevent mechanical damage and maintain measurement accuracy . In summary, temperature-measuring optical cables generally involve splicing single-mode fibers with multiple FBGs per channel, with up to 4 channels per cable, and each core is carefully fused and protected to ensure reliable temperature sensing.
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