Fiber Optic Sensor Stripper Principle

Fiber optic sensor stripping involves precisely removing the protective polymer coatings from an optical fiber to expose the bare glass core and cladding without causing damage, enabling accurate splicing, connectorization, or sensor integration.

Purpose of Stripping

The primary goal of fiber optic stripping is to remove the outer protective layers—such as the buffer coating, acrylate coating, or outer jacket—so that the 125 µm glass core and cladding are exposed for sensor or splicing applications. This is essential because the coatings, while providing mechanical protection and flexibility, interfere with optical connections and sensor interactions if not removed. Proper stripping ensures minimal signal loss, prevents back reflections, and maintains the integrity of the fiber.

Operating Principles

Fiber optic stripping can be achieved through several methods: Mechanical Stripping: Uses precision tools with calibrated notches or holes to cut and remove the coating without touching the glass itself. The notches are sized to match the coating thickness, allowing the polymer to be removed cleanly while leaving the fiber intact. Thermal Stripping: Applies controlled heat, often via hot air or specialized heating units, to soften or burn off the coating, which can then be removed without mechanical stress on the fiber.

Chemical Stripping: Involves using hot acids or solvents to dissolve the polymer coating selectively, exposing the bare fiber for further processing.

Non-

Contact Methods: Advanced techniques, such as plasma or laser ablation, can remove coatings without physical contact, reducing the risk of micro-cracks or scratches.

Key Considerations

Precision: Stripping must be done with micron-level accuracy to avoid nicking or scratching the glass, which could compromise sensor performance or lead to fiber breakage. Coating Compatibility: Different fibers have coatings like acrylate, polyimide, or UV-cured polymers, requiring specific stripping tools or settings. Length Control: The stripped section must match the requirements of the sensor or splice, often around 30–40 mm, or shorter for specialized applications like fiber Bragg gratings.

Conclusion

The principle behind fiber optic sensor stripping is controlled, precise removal of protective coatings to expose the bare fiber for optical connectivity or sensor integration. By using mechanical, thermal, chemical, or non-contact methods, technicians ensure the fiber remains intact, maintains optical performance, and is ready for accurate sensor deployment or splicing.