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Focused Reflection Fiber Optic Sensor

Fiber and communications infrastructure knowledge brief Published 16 Sep 2023

Prepared for preliminary research by the METRA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

A reflective focusing fiber optic sensor detects targets by emitting light onto a surface and measuring the reflected light, allowing precise detection of small or transparent objects over adjustable distances.

Working Principle

Reflective focusing fiber optic sensors operate by emitting light from a fiber optic transmitter toward a target. The light reflects off the target and returns to the receiver, where the sensor measures the intensity of the reflected light to determine the presence or position of the object ( ). The focusing aspect uses a lens or spot adjustment to concentrate the light beam, improving detection accuracy for small or distant targets ( ).

Key Features

Adjustable Detection Distance: The focusing lens allows the sensor to detect objects at distances ranging from a few millimeters to several meters ( ). Small Object Detection: Ultra-small fiber heads and precise centering enable detection of minute parts, even in narrow or confined spaces ( ). Transparent and Opaque Targets: Reflective focusing sensors can detect both transparent and opaque objects by adjusting the beam focus and using diffuse reflection techniques ( ).

Environmental Tolerance: Many models are resistant to chemicals, high temperatures, and mechanical flexing, making them suitable for harsh industrial environments ( ).

Applications

Reflective focusing fiber optic sensors are widely used in: Precision manufacturing: Detecting small components on assembly lines. Automation systems: Monitoring object presence or position in tight spaces. High-temperature or chemical environments: Using fibers with protective coatings to withstand extreme conditions ( ).

Transparent object detection: Such as glass, plastic films, or liquid surfaces ( ).

Advantages

Compact and Flexible: Fiber units can be installed in limited spaces without housing electronic components ( ). Easy Installation: Adjustable spot size and focal distance reduce the need for precise alignment ( ). High Accuracy: Focused light beams improve detection reliability for small or irregularly shaped targets ( ).

Versatility: Can be used in combination with spot lenses or specialized fiber heads for specific applications ( ).

Example Models

Panasonic FD-R35G: Reflective type with high emission power and stable beam for precise detection ( ).

IF

M E20748: Fiber optic diffuse reflection sensor suitable for industrial automation ( ).

KEYENCE F

U Series: Adjustable spot size and lens options for small object detection in confined spaces ( ). Reflective focusing fiber optic sensors are ideal for applications requiring high precision, adaptability to challenging environments, and detection of small or transparent objects. Their combination of compact design, adjustable focus, and environmental resilience makes them a versatile choice in modern industrial sensing systems.

Focused Reflection Fiber Optic Sensor - METRA FIBER MARKET [PDF]

Focused Reflection Fiber Optic Sensor
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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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