Fiber Sensors
Optical fiber is comprised of a central core with a high refractive index surrounded by cladding with a low refractive index. When light
Sensor wiring optoelectronic fiber optic
Optoelectronic fiber optic sensors use a combination of fiber cables and amplifiers, where the sensor head transmits and receives light while the amplifier processes signals, enabling precise detection in tight or harsh environments.
Components and Wiring Overview
A typical fiber optic sensor system consists of three main components: the fiber optic cable (or sensor head), the fiber amplifier unit, and the light source/detector integrated in the amplifier . The fiber cable is flexible and can be made of plastic or glass, allowing installation in narrow or hard-to-reach locations . The amplifier contains the electronics, light source (LED or laser), and signal processing circuits, while the fiber head is purely optical, with no electronics, which enhances reliability in harsh conditions .
Wiring Principles
- Connection to Amplifier: The fiber optic cable is connected to the amplifier unit using standard connectors. The amplifier provides the light source and receives the reflected or transmitted light from the fiber head .
- Power Supply: The amplifier requires a DC power supply, typically 12–24 V, depending on the manufacturer. Ensure proper grounding to reduce electrical noise .
- Signal Output: Amplifiers provide output signals (NPN/PNP, analog, or digital) that indicate detection events. These outputs are wired to a PLC, controller, or monitoring system .
- Fiber Routing: Fiber cables should be routed to avoid sharp bends, excessive tension, or exposure to high temperatures beyond the cable rating. Plastic fibers are more flexible but less temperature-resistant than glass fibers .
- Sensing Configuration: Depending on the application, the system can be configured as through-beam, reflective, or retro-reflective. Wiring may include separate fibers for emitter and receiver in through-beam setups, while reflective setups use a single fiber for both transmission and reception .
Installation Considerations
- Environmental Resistance: Fiber heads are immune to EMI, vibration, and moisture, making them suitable for industrial environments .
- Non-contact Sensing: Objects are detected without physical contact, reducing wear and maintenance .
- Distance and Flexibility: Fiber optic systems can operate over long distances, with some distributed sensing systems exceeding 45 km, though typical industrial sensors are shorter .
- Calibration and Alignment: Proper alignment of the fiber head relative to the target or reflective surface is critical for accurate detection. Some systems include adjustable brackets for precise positioning .
Advanced Options
- Fiber Bragg Gratings (FBGs): For strain, temperature, or pressure sensing, FBGs can be integrated into the fiber, converting physical changes directly into wavelength shifts, which are read by specialized interrogators .
- Intrinsic vs Extrinsic Sensors: Intrinsic sensors modulate light within the fiber itself, while extrinsic sensors use an external transducer to modulate light, affecting wiring and amplifier configuration . By following these wiring and installation principles, optoelectronic fiber optic sensors can be effectively deployed for precise, reliable detection in industrial automation, structural monitoring, and other applications requiring high sensitivity and environmental robustness .
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