In a multiplexed system, what happens if the wavelength ranges of two sensors overlap?
When the wavelength ranges of two Fiber Bragg Grating (FBG) sensors overlap in a multiplexed system, it leads to signal interference and inaccurate measurements.
Each FBG in a multiplexed system is designed to reflect light at a specific, unique wavelength window. This allows the demodulator to distinguish between the signals from different sensors. If two or more sensors have overlapping reflection wavelength ranges, the demodulator will be unable to differentiate their individual signals. It will either read a combined, erroneous signal or completely miss one of the sensor’s readings, making it impossible to accurately determine the physical parameters (like strain or temperature) each sensor is measuring. This compromises the integrity and reliability of the entire sensing system.
Here is an example of an OFSCN® Polyacrylate Fiber Bragg Gratings:
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