Patent
Dynamic strain distributed fiber optic sensor
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TLDR
In this paper, a distributed fiber optic sensor simultaneously interrogates the sensing fiber with two counter propagating light beams, one beam is set to a constant frequency and the second beam is modified to contain a "comb" of frequencies, with each frequency component in the comb offset by a predetermined amount.Abstract:
A distributed fiber optic sensor simultaneously interrogates the sensing fiber with two counter propagating light beams. One beam is set to a constant frequency. The second beam is modified to contain a “comb” of frequencies, with each frequency component in the comb offset by a predetermined amount. Each of the frequency components in the comb, herein referred to as teeth, is able to interact with the counter-propagating beam through the Brillouin scattering process. With proper selection of the comb characteristics such as the number of teeth, the frequency spacing of teeth, the spectral width of teeth, and the relative amplitude of the teeth, a representation of the Brillouin spectrum at each point in the fiber can be obtained simultaneously with a single pass through the fiber.read more
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Fast brillouin optical time domain analysis for dynamic sensing
Yair Peled,Moshe Tur +1 more
TL;DR: In this article, a method for conducting fast Brillouin optical time domain analysis for dynamic sensing of optical fibers is presented, which includes the following stages: injecting a pump pulse signal into the first end of an optical fiber and a probe signal into a second end of the optical fiber, wherein the probe and the pump pulse signals exhibit a frequency difference between them that is appropriate for an occurrence of a Brillourin effect; alternating the frequency of either the probe or the pulse signals, so as the alternated signal exhibits a series of signal sections, each signal section having a pred
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References
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Patent
Optical sensing device containing fiber bragg gratings
TL;DR: In this article, a new optical sensing device containing fiber Bragg gratings (26), a scanning bandpass filter (28), an interferometer (40), and multiple photodetectors (44, 46, 48).
Patent
Fiber Bragg grating interrogation system with adaptive calibration
TL;DR: In this article, a system and method for providing accurate measurements of the reflected wavelengths from multiple strings of fiber Bragg grating (FBG) elements using a single scanning optical filter and an isolated duplicate reference string of FBG elements is presented.