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Fiber optic sensor with thin fiber optic head

Thin fiber optic sensor heads enable precise detection in tight spaces and harsh environments, offering flexibility in installation and high sensitivity for small or minute objects.Overview

Fiber optic sensors consist of two main components: the amplifier, which contains the light source and processing electronics, and the fiber optic head, which transmits and receives light for detection purposes. Thin or compact fiber optic heads are designed to fit into narrow spaces, detect small or minute objects, and operate in environments where conventional sensors may not be suitable .

Key Features of Thin Fiber Optic Heads
  • Compact Size: Ultra-small diameters and thin rectangular shapes allow installation in confined areas and precise centering for accurate detection .
  • Versatile Sensing Methods: Available in thru-beam, reflective, retro-reflective, and definite reflective types to suit different target shapes and materials .
  • High Environmental Resistance: Many heads are resistant to high temperatures (-60 to +350°C / -76 to +662°F), chemicals, and mechanical stress, making them suitable for harsh industrial conditions .
  • Flexible Materials: Fiber sheaths and cases can be made from PFA, stainless steel, or flexible polymers, providing chemical resistance and durability .
  • Precision Detection: Combining the fiber with a spot lens enhances the ability to detect very small or transparent objects .
  • Customizable Options: Fiber lengths, sleeve lengths, and head shapes (threaded, cylindrical, flat, L-shaped, U-shaped, area detection) can be tailored to specific applications .
Applications

Thin fiber optic heads are ideal for:

  • Detecting minute parts in assembly lines or electronics manufacturing .
  • Installation in tight or narrow spaces where conventional sensors cannot fit .
  • Environments with extreme temperatures, chemical exposure, or high vibration .
  • Sensing transparent or irregularly shaped objects using specialized reflective heads .
Integration and Use

These fiber heads are typically connected to a fiber optic sensor amplifier, which handles signal processing and output. Many modern systems feature OLED displays, integrated status indicators, and reduced wiring options, simplifying setup and monitoring . Some models also allow remote teaching and PLC integration for automated adjustments .

Examples of Products
  • Panasonic FT-KV40H1: Thru-beam type for indefinite shapes or positions.
  • Panasonic FD-L13H1: Reflective type optimized for transparent objects.
  • Autonics Fiber Units: Multiple head types including flat, L-shaped, U-shaped, and area detection with flexible or heat-resistant cables .
  • Keyence FU Series: Offers high environmental resistance and various head options for difficult targets . Thin fiber optic heads provide a highly adaptable, precise, and durable solution for industrial sensing applications where space, object size, or environmental conditions are challenging.
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