Fiber Optic Sensor for Coil Diameter Detection

Fiber optic sensors can accurately measure coil diameters and flange positions in real time, supporting high-precision winding and layer control.

Overview

Fiber optic sensors are widely used in coil and spool measurement due to their high precision, flexibility, and ability to operate in challenging environments. These sensors detect the position and geometry of coils, including cylindrical and conical shapes, and can measure diameters continuously during winding processes . They are suitable for a variety of materials, including wire, flat wire, fiber optics, glass fiber, and fine wires, with diameters as small as 7 µm .

Sensor Types and Principles

• Plastic Optical Fibers (POF): Flexible, lightweight, and suitable for dynamic bending applications. Ideal for small bending radii and environments with frequent movement .
• Glass Optical Fibers: High-purity quartz fibers with low signal attenuation, capable of transmitting visible, infrared, and ultraviolet light. They offer excellent thermal, chemical, and UV resistance, making them suitable for harsh industrial conditions .
• 3D Spool Scanners: These sensors provide real-time 3D measurement of coil geometry and flange detection. They automatically detect reversal points and layer positions, ensuring precise winding control .

Key Features

• High Accuracy: Fiber optic sensors can detect minute changes in coil diameter and height differences below 100 µm .
• Real-Time Monitoring: Continuous measurement allows for immediate adjustments during winding, improving product quality and reducing material waste .
• Versatility: Compatible with various coil shapes, materials, and surface finishes, including reflective or matte surfaces .
• Integration: Can be combined with winding controllers (e.g., MCU systems) for automated layer-optimized spooling and straight-line unwinding .
• Durability: Glass fiber optics with protective sleeves resist mechanical damage, chemicals, and temperature variations, ensuring long-term operational stability .

Applications

• Winding Technology: Ensures precise coil diameter control for electronic winders, transformers, and motor coils.
• Quality Control: Detects irregularities in coil geometry, flange misalignment, or layer inconsistencies.
• Material Handling: Suitable for fine wires, fiber optics, and other sensitive materials where traditional contact sensors may be unsuitable.

Conclusion

Fiber optic sensors provide a highly reliable, precise, and flexible solution for coil diameter detection. By leveraging real-time 3D scanning and advanced optical fibers, these sensors enhance winding accuracy, reduce material waste, and support automated production processes in demanding industrial environments .