Matrix-type through-beam fiber optic sensor

Matrix-type through-beam fiber optic sensors detect objects by interrupting a light beam transmitted through fiber optics, offering high precision, long-range detection, and suitability for harsh industrial environments.

Operating Principle

Matrix-type through-beam fiber optic sensors consist of a separate transmitter and receiver, connected via optical fibers. The transmitter emits light through the fiber, which is directed toward the receiver fiber. When an object interrupts the light beam, the receiver detects a drop in light intensity, triggering a switching signal ( ). Unlike diffuse sensors, these sensors do not rely on reflected light from the object, making them highly reliable for detecting opaque, glossy, or dark surfaces ( ).

Fiber Optic Materials

• Plastic fibers (PMMA): Lightweight, flexible, and suitable for small bending radii (down to 1 mm). Ideal for dynamic applications such as cable carriers ( ).
• Glass fibers: Offer low signal attenuation, broad-spectrum light transmission (visible, IR, UV), and high resistance to chemicals, heat, and UV radiation. Glass fibers are preferred for harsh or chemically aggressive environments ( ).

Matrix and Array Configurations

Matrix-type sensors often use array fiber optics, which generate a broad, linear light band instead of a single point beam. This allows position-independent detection of irregular or moving objects. The width and lens design of the array can adjust the detection area in both x and y directions, providing homogeneous light distribution and extended range ( ).

Advantages

• High reliability: Detects objects regardless of color, gloss, or material ( ).
• Long-range detection: Some systems can reach up to 600 meters ( ).
• Resistance to environmental interference: Effective in dust, steam, fog, or heavy contamination ( ).
• Flexible installation: Available in compact, threaded, or fork-style housings for conveyor belts and small parts detection ( ).

Applications

Matrix-type through-beam fiber optic sensors are widely used in:

• Industrial automation: Object detection on conveyor systems.
• Harsh environments: Chemical plants, dusty or wet conditions.
• Precision monitoring: Detecting small or irregularly shaped parts.
• Safety and hazardous areas: ATEX/IECEx-certified models for explosive atmospheres ( ).

Purchasing and Technical Resources

These sensors are available from suppliers like ifm, Tippkemper Matrix, Balluff, Baumer, and Mouser Electronics, with datasheets, CAD drawings, and mounting instructions provided for integration into industrial systems ( ). Matrix-type through-beam fiber optic sensors combine high precision, environmental robustness, and flexible detection capabilities, making them ideal for demanding industrial and automation applications.