1. Intrinsic Sensors Intrinsic sensors are integrated into the fiber itself, where the fiber acts as the sensing element. The measurand, such as strain, temperature, or pressure, directly affects the light transmitted within the fiber, allowing the sensor to detect changes without external transducers . 2. Extrinsic Sensors Extrinsic sensors use the fiber primarily as a light guide. The sensing occurs outside the fiber, and the fiber transmits light to and from the external transducer. This type is suitable for applications where the sensing element cannot be embedded in the fiber . 3. Hybrid Sensors Hybrid sensors combine intrinsic and extrinsic principles. The fiber carries light into and out of the device, allowing both internal and external modulation of the light signal .
1. Through-Beam Sensors These sensors detect objects by measuring interruptions in a light beam between a transmitter and receiver. They are highly reliable for precise object detection . 2. Diffuse Sensors Diffuse sensors evaluate the intensity of light reflected from an object. Surface properties like color, texture, and gloss influence detection, making them suitable for variable object surfaces . 3. Array Fiber Optics Array fiber optics generate a broad, linear light band for position-independent detection of irregular objects. They often include integrated lenses to produce a homogeneous light distribution and extended detection range .
1. Plastic Fiber Optics Plastic fibers, typically made of PMMA (polymethyl methacrylate), are lightweight, flexible, and suitable for dynamic bending applications. They are ideal for short-distance visible light transmission and cost-effective solutions . 2. Glass Fiber Optics Glass fibers, made from high-purity quartz, offer low signal attenuation, broad-spectrum light transmission (visible, infrared, ultraviolet), and high resistance to thermal, chemical, and environmental stress. They are preferred for harsh or long-distance applications .
Fiber optic sensors are widely used in Belgium for:
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