Patent US4976507A successfully refreshed from Google Patents.
US4976507A
Expired / Lapsed
US
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Sagnac distributed sensor
Assignee: McDonnell Douglas Corp
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Filing: 1989-09-22
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Granted: 1990-12-11
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Expires: 2009-09-22
Abstract
Abstract A system based on the usage of a Sagnac interferometer operating in a dual sensing mode is described which allows the determination of the location and amplitude of a time varying disturbance on a single fiber.
Inventors
- 👤 Eric Udd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:55
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/353; G01D5/35383; G01H; G01H9/00; G01H9/004
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
56 words
A frequency shifter switch comprising: transduction means for admitting light and acoustically shifting the frequency of said admitted light wherein said transduction means further comprises: a TeO 2 crystal; and, a LiNbO 3 piezoelectric transducer attached to said TeO 2 crystal; and, optical coupling means for receiving and transmitting both frequency shifted and non-frequency shifted light.
Claim 2
Dependent Claim
56 words
A frequency shifter switch comprising: transduction means for admitting light and acoustically shifting the frequency of said admitted light wherein said transduction means further comprises: a TeO 2 crystal; and, a LiNbO 3 piezoelectric transducer attached to said TeO 2 crystal; and, optical coupling means for receiving and transmitting both frequency shifted and non-frequency shifted light.
Claim 3
Dependent Claim
115 words
A frequency shifter switch comprising: transduction means for admitting light and acoustically shifting the frequency of said admitted light; and, optical coupling means for receiving and transmitting both frequency shifted and non-frequency shifted light wherein said optical coupling means further comprises: a first lens adjacent said transduction means, and generally linearly oriented to receive said non-frequency shifted admitted light; a second lens adjacent said transduction means, and generally linearly oriented to receive said frequency shifted admitted light; and an optic coupler having a first input optically connected to said first lens, a second input optically connected to said second lens, and at least one output for transmitting light from said first and said second lenses.
Claim 4
Dependent Claim
115 words
A frequency shifter switch comprising: transduction means for admitting light and acoustically shifting the frequency of said admitted light; and, optical coupling means for receiving and transmitting both frequency shifted and non-frequency shifted light wherein said optical coupling means further comprises: a first lens adjacent said transduction means, and generally linearly oriented to receive said non-frequency shifted admitted light; a second lens adjacent said transduction means, and generally linearly oriented to receive said frequency shifted admitted light; and an optic coupler having a first input optically connected to said first lens, a second input optically connected to said second lens, and at least one output for transmitting light from said first and said second lenses.
Claim 5
Dependent Claim
29 words
The frequency shifter switch of claim 2 wherein said transduction means further comprises: a TeO 2 crystal; and. a LiNbO 3 piezoelectric transducer attached to said TeO 2 crystal.
Claim 6
Dependent Claim
122 words
A frequency shifter switch comprising: transduction means for admitting light and acoustically shifting the frequency of said admitted light; and optical coupling means for receiving and transmitting both frequency shifted and non-frequency shifted light wherein said optical coupling means further comprises: a lens adjacent said transduction means, and generally linearly oriented to receive light passing through said transduction means; a mechanical actuator, movably supporting said lens such that when said transducer produces non-frequency shifted light, said mechanical actuator means said lens in a position to capture said non-frequency shifted light, and when said transducer produces frequency shifted light, said mechanical actuator moves said lens in a position to capture said frequency shifted light; and, an optic fiber optically connected to said lens.
Claim 7
Dependent Claim
122 words
A frequency shifter switch comprising: transduction means for admitting light and acoustically shifting the frequency of said admitted light; and optical coupling means for receiving and transmitting both frequency shifted and non-frequency shifted light wherein said optical coupling means further comprises: a lens adjacent said transduction means, and generally linearly oriented to receive light passing through said transduction means; a mechanical actuator, movably supporting said lens such that when said transducer produces non-frequency shifted light, said mechanical actuator means said lens in a position to capture said non-frequency shifted light, and when said transducer produces frequency shifted light, said mechanical actuator moves said lens in a position to capture said frequency shifted light; and, an optic fiber optically connected to said lens.
Claim 8
Dependent Claim
29 words
The frequency shifter switch of claim 4 wherein said transduction means further comprises: a TeO 2 crystal; and, a LiNbO 3 piezoelectric transducer attached to said TeO 2 crystal.
Claim 9
Dependent Claim
109 words
A frequency shifter switch comprising: a first lens adjacent said transduction means, and generally linearly oriented to transmit light; transduction means for admitting said transmitted light and acoustically shifting the frequency of said admitted light; a second lens adjacent said transduction means, and generally linearly oriented to receive said non-frequency shifted admitted light; a third lens adjacent said transduction means, and generally linearly oriented to receive said frequency shifted admitted light; and, an optic coupler having a first input optically connected to said second lens, a second input optically connected to said third lens, and at least one output for transmitting light from said first and said second lenses.
Claim 10
Dependent Claim
109 words
A frequency shifter switch comprising: a first lens adjacent said transduction means, and generally linearly oriented to transmit light; transduction means for admitting said transmitted light and acoustically shifting the frequency of said admitted light; a second lens adjacent said transduction means, and generally linearly oriented to receive said non-frequency shifted admitted light; a third lens adjacent said transduction means, and generally linearly oriented to receive said frequency shifted admitted light; and, an optic coupler having a first input optically connected to said second lens, a second input optically connected to said third lens, and at least one output for transmitting light from said first and said second lenses.
References Cited (Backward Citations)
US4735485A
Cited
US4789241A
Cited
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