Strain sensor comprising a strain sensitive, two-mode optical
First Claim
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1. A strain sensor, comprising:
- a strain sensitive, two-mode optical fiber;
a least one strain insensitive optical fiber disposed to transmit light passing through said strain sensitive, two-mode optical fiber;
light supply means for supplying the light passing through said strain sensitive, two-mode optical fiber and transmitted by said at least one strain insensitive optical fiber; and
light detection means for detecting the light passing through said strain sensitive, two-mode optical fiber and transmitted by said at least one strain insensitive optical fiber.
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Abstract
A strain sensor uses an optical fiber including a strain sensitive portion and at least one strain insensitive portion. The strain sensitive portion is mounted on the surface of a structure at a location where a strain is desired to be measured. The strain insensitive portion(s) may be fused to the strain sensitive portion to transmit light therethrough, so that the resulting pattern may be detected to determine the amount of strain by comparison with a similar fiber not subjected to strain, or with the light pattern produced when the fiber is not under strain.
21 Citations
6 Claims
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1. A strain sensor, comprising:
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a strain sensitive, two-mode optical fiber; a least one strain insensitive optical fiber disposed to transmit light passing through said strain sensitive, two-mode optical fiber; light supply means for supplying the light passing through said strain sensitive, two-mode optical fiber and transmitted by said at least one strain insensitive optical fiber; and light detection means for detecting the light passing through said strain sensitive, two-mode optical fiber and transmitted by said at least one strain insensitive optical fiber. - View Dependent Claims (2, 3, 4, 5)
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6. A strain sensor, comprising:
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a strain sensitive, two-mode optical fiber; at least one strain insensitive optical fiber disposed to transmit light passing through said strain sensitive, two-mode optical fiber; one end of said strain sensitive, two-mode optical fiber is fused to an end of said at least one strain insensitive optical fiber; light supply means for supplying the light passing through said strain sensitive, two-mode optical fiber and transmitted by said at least one strain insensitive optical fiber; and light detection means for detecting the light passing through said strain sensitive, two-mode optical fiber and transmitted by said at least one strain insensitive optical fiber.
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Specification