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Distributed fiber optic temperature sensors and systems

  • US 5,696,863 A
  • Filed: 03/11/1996
  • Issued: 12/09/1997
  • Est. Priority Date: 08/06/1982
  • Status: Expired due to Fees
First Claim
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1. An optical fiber adapted to sense physical variables at different locations along its length, comprising at least two light-guiding regions A and B and so characterized that, when interrogated with light pulses of submicrosecond duration and of a wavelength or wavelengths within a suitable pre-selected spectral region injected into region A, the intensity of each interrogating light pulse propagating at each location along the fiber is distributed between said regions A and B, the relative distribution varying as a function of the magnitude of the physical variable acting on the fiber at that location, the fiber being adapted to automatically process said relative distribution into two resolvable optical signals the relative intensities of which are an indicator of said relative distribution, one of said two signals reaching at least one fiber end separated in the time domain from optical signals generated at other sensing locations along the fiber.

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