Distributed device for the detection of a substance
First Claim
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1. A distributed substance detection device, comprising:
- a distributed optical excitation source comprising;
a first optical fiber provided with a plurality of extraction regions regularly distributed along a length of the first optical fiber, each extraction region being configured for extracting from the first optical fiber part of the light conveyed by the fiber;
a first light source configured for injecting into the first optical fiber a first light signal at an absorption wavelength of the substance to be detected; and
a control circuit configured for modulating the first light signal in intensity at an acoustic frequency; and
a distributed acoustic detector comprising;
a second optical fiber;
a second light source configured for injecting a second light signal into the second optical fiber; and
an optical detector configured for measuring a backscattered light signal in the second optical fiber to detect and locate an acoustic vibration at the modulation frequency of the first light signal.
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Abstract
A distributed device for the detection of a substance is disclosed, comprising: a distributed optical excitation source (21) including a first optical fiber (22) having a plurality of extraction regions (24), each extraction region (24) being adapted to extract part of the light carried by the first optical fiber (22) from said fiber; and a distributed acoustic sensor (25) including a second optical fiber (26).
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Citations
14 Claims
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1. A distributed substance detection device, comprising:
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a distributed optical excitation source comprising; a first optical fiber provided with a plurality of extraction regions regularly distributed along a length of the first optical fiber, each extraction region being configured for extracting from the first optical fiber part of the light conveyed by the fiber; a first light source configured for injecting into the first optical fiber a first light signal at an absorption wavelength of the substance to be detected; and a control circuit configured for modulating the first light signal in intensity at an acoustic frequency; and a distributed acoustic detector comprising; a second optical fiber; a second light source configured for injecting a second light signal into the second optical fiber; and an optical detector configured for measuring a backscattered light signal in the second optical fiber to detect and locate an acoustic vibration at the modulation frequency of the first light signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification