Advantages of Long-Distance Transmission

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Will the signal distort if the sensor is located kilometers or even dozens of kilometers away from the interrogator?

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No, the signal from a Fiber Bragg Grating (FBG) sensor will not distort in the same way an electrical signal would over long distances, even kilometers or tens of kilometers. This is because FBG sensors transmit an optical signal, not an electrical one.

Key points regarding long-distance transmission with FBG sensors:

• Immunity to EMI: FBG sensors are inherently immune to electromagnetic interference (EMI), which is a common cause of signal distortion in traditional electrical sensors over long cable runs.
• Optical Signal Integrity: The sensor’s information is encoded in the reflected wavelength of light, which is highly robust against external noise and electrical distortion.
• Optical Loss: The primary factor limiting distance in optical fiber systems is optical power loss (attenuation) in the fiber itself. However, this is a reduction in signal strength, not a distortion of the signal’s information (wavelength). With appropriate optical fiber and potentially optical amplifiers for very long distances (tens of kilometers), this can be managed effectively.
• Multi-point Multiplexing: FBG technology allows for multiple sensors to be multiplexed on a single optical fiber, which is highly advantageous for monitoring various points over extended lengths with minimal cabling.

For applications requiring long-distance monitoring, such as pipeline or structural health monitoring over vast areas, OFSCN® Alloy Tube Packaged Fiber Bragg Grating Strain Sensors are a robust choice. These sensors are designed for stability and durability, even in challenging environments.

Here is an example of an OFSCN® Alloy Tube Packaged Fiber Bragg Grating Strain Sensor:

You can find more detailed technical parameters on our website: OFSCN® Alloy Tube Packaged Fiber Bragg Grating Strain Sensor.