- Available Technology
Distributed Sensing, Static Measurement, Distributed Acoustic Sensing, Optical Interference, Frequency Domain
This sensing system includes an optical fiber with a series of any two reflectors from a Fabry Perot Interferometer (FPI), which records the localized change in distance between the reflectors in the form of optical interference. The microwave photonics interrogation unit is configured to prepare a microwave modulated low coherence light wave. By scanning the microwave frequencies, the complex microwave spectrum is obtained and converted to a time domain signal at a known location by complex Fourier transform. The values of these time domain pulses are a function of the optical path differences of the distributed FPI’s, which are used to read the displacement between pairs of measurement reflectors.
• Lower cost than other strain sensing methods
• CMPI measures strain directly so it can measure sharper spatial resolution with clear, defined uncertainty
• Allows for a faster temporal resolution
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