How to identify the model number of a fiber optic sensor

The model number of a fiber optic sensor encodes key information about the sensor type, sensing method, fiber head style, environmental resistance, and compatibility with amplifiers.

Overview

Fiber optic sensors consist of two main components: the amplifier (which contains the light source and processing electronics) and the fiber optic sensor head (which transmits and receives light) . Manufacturers use model numbers to convey the specifications and features of these components, allowing users to select the correct sensor for their application.

What Model Numbers Typically Indicate

1. Sensor Type and Amplifier Series The first part of the model number often identifies the series or family of the sensor, which determines the amplifier type, power output, and general capabilities . For example, a “FU Series” may indicate a specific amplifier and compatible fiber heads.
2. Sensing Method Model numbers may include codes for the detection method, such as:
   • Through-beam: light passes directly from emitter to receiver
   • Reflective: light reflects off the target back to the sensor
   • Retro-reflective: light reflects off a reflector and returns to the sensor
3. Fiber Head Style and Size Codes can indicate the shape, size, or mounting style of the fiber head, such as cylindrical, square, or miniature heads, which affect installation flexibility and detection precision .
4. Environmental Resistance Some model numbers include letters or numbers specifying resistance to temperature, vibration, water, or electrical noise, helping users choose sensors suitable for harsh environments .
5. Special Features or Options Additional characters may denote special features, such as integrated brackets, high-precision detection, or compatibility with specific targets like liquids, glass, or wafers .
6. Wavelength or Light Source In some cases, the model number indicates the LED wavelength or light type used, which can affect detection of transparent or reflective materials .

Practical Example

A model number like FU-12R-H could be interpreted as:

• FU: Series/amplifier type
• 12: Fiber head size or length
• R: Reflective sensing method
• H: High environmental resistance or high-power option This structured coding allows engineers to quickly identify the sensor's capabilities and ensure compatibility with their system.

Conclusion

In summary, the model number of a fiber optic sensor is a compact code that communicates the sensor's series, sensing method, fiber head type, environmental resistance, and optional features. Understanding these codes is essential for selecting the right sensor for specific industrial or automation applications .