What is the purpose of reapplying Polyimide or Acrylate after the grating is inscribed?
After the fiber’s original coating is stripped for grating inscription, the bare fiber becomes vulnerable to external damage and its mechanical strength is compromised. The purpose of reapplying Polyimide or Acrylate (recoating/secondary coating) is to protect the FBG from environmental factors, enhance its mechanical integrity, and ensure its long-term reliability. This protective layer prevents micro-cracks, chemical corrosion, and maintains the fiber’s tensile strength, which are crucial for the sensor’s performance and lifespan.
OFSCN offers bare Fiber Bragg Gratings with both polyacrylate and polyimide recoatings:
- OFSCN® Polyacrylate Fiber Bragg Gratings / Fiber Bragg Grating Strings (bare)
- OFSCN® Polyimide Fiber Bragg Gratings / Fiber Bragg Grating Strings (bare)
The image below illustrates a multi-point FBG sensor, where recoating plays a critical role in protecting each grating:
1 Like