On-line Sagnac interferometric distributed fiber-optic leakage detection device
AssigneeChung-Shan Institute of Science and Technology
InventorsWuu-Wen Lin, Shih-Chu Huang
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Abstract
An on-line Sagnac interferometric distributed fiber-optic leakage detection device comprising a light generator, an optical fiber coupler, a hollow pipeline, a Faraday rotator mirror, a sensing optical fiber, a delaying optical fiber, a photo detection device and a spectrum analyzer. Signals resulting from a leaky pipeline are obtained by the linear leakage detection system. The signals are analyzed by the spectrum analyzer to discover any null frequency shift so that exact location of the leakage point along the hollow pipeline can be computed.
Claims5
An on-line Sagnac interferometric distributed fiber-optic leakage detection device, comprising:
- a light generator for producing a beam of light;
- an optical fiber coupler having a first light input/output port coupled to the light generator, wherein the optical fiber coupler splits up the light going from the light generator to the first light input/output port into three equal intensity light beams;
- a hollow pipe for transporting a liquid or a gas;
- a Faraday rotator mirror installed at an end of a sensing optical fiber installed in the hollow pipe for compensation of the polarization induced signal fading, wherein the sensing optical fiber coupled to a second light input/output port of the optical fiber coupler and the Faraday rotator mirror for transmitting a beam of light to or from the second light input/output port;
- a delaying optical fiber coupled to a third light input/output port and a fourth light input/output port of the optical fiber coupler for transmitting light from the third input/output port to the fourth input/output port;
- a photo detection device coupled to a fifth light input/output port of the optical fiber coupler for receiving the beam of light emerging from the fifth light input/output port and converting the beam into an electrical signal;
- and
- a spectrum analyzer connected to the photo detection device for picking up the electrical signal from the photo detection device;
- wherein the sensing optical fiber is a linear element having no bends so that losses due to light bending are greatly reduced.
Dependencies are inferred from the claim text.