Patent US3693017A successfully refreshed from Google Patents.
Patent EP0041668A2 successfully refreshed from Google Patents.
EP0041668A2
Expired / Lapsed
EP
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Fiber optical measuring device
Assignee: ABB Norden Holding AB
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Filing: 1981-06-01
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Granted: —
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Expires: 2001-06-01
Abstract
Abstract The invention relates to a fiber optical measuring device with a transducer section (5, 6, 7) comprising an optically supplied electronic system (7), the supply power and the measuring signal being arranged to be transmitted on the same light guide fiber (4), the device comprising light-emitting diodes (2,5) and photo-diodes (3, 6). The invention is characterized in that the light-emitting diode (5) for transmission of the measuring signal is transparent to the light wavelength (λ 1 ), which is used for supplying the photo-diode (6) for the power supply, and that this light-emitting diode (5) is located in the optical path between the end of the fiber (4) and the photo-diode (6) receiving the optical supply power, and/or that the photo-diode (3) for receiving the measuring signal is transparent to the light wavelength (λ 1 ) that is used for the supply power, this photo-diode (3) being positioned between the other end of the fiber (4) and the light-emitting diode (2) which emits the supply power. The Invention allows the use of the same light guide fiber (4) for transmitting the measuring signal and the supply signal without the need for fiber branches.
Inventors
- 👤 Morgan Adolfsson
- 👤 Torgny Brogärdh
- 👤 Sture Göransson
- 👤 Christer Ovren
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 14:26
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/40; G; G02; G02B; G02B6/00; G02B6/24; G02B6/42; G02B6/4201; G02B6/4202; G02B6/4246; H04B10/80; H04B10/806; H04B10/807; H10; H10F; H10F55/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
160 words
Fiber optical measuring device with a transducer section (5, 6, 7) comprising an optically supplied electronic system (7), the supply power and the measuring signal being arranged to be transmitted on the same light guide fiber (4), the device comprising light-emitting diodes (2, 5) and photo-diodes (3, 6), characterized in that the light-emitting diode (5) for transmission of the measuring signal is transparent to the light wavelength (λ 1 ), which is used for supplying the photo-diode (6) for the power supply, and that this light-emitting diode (5) is located in the optical path between the end of the fiber (4) and the photo-diode (6) receiving the optical supply power, and/or that the photo-diode (3) for receiving the measuring signal is transparent to the light wavelength (λ 1 ) that is used for the supply power, this photo- diode (3) being positioned between the other end of the fiber (4) and the light-emitting diode (2) which emits the supply power.
Claim 2
Dependent Claim
160 words
Fiber optical measuring device with a transducer section (5, 6, 7) comprising an optically supplied electronic system (7), the supply power and the measuring signal being arranged to be transmitted on the same light guide fiber (4), the device comprising light-emitting diodes (2, 5) and photo-diodes (3, 6), characterized in that the light-emitting diode (5) for transmission of the measuring signal is transparent to the light wavelength (λ 1 ), which is used for supplying the photo-diode (6) for the power supply, and that this light-emitting diode (5) is located in the optical path between the end of the fiber (4) and the photo-diode (6) receiving the optical supply power, and/or that the photo-diode (3) for receiving the measuring signal is transparent to the light wavelength (λ 1 ) that is used for the supply power, this photo- diode (3) being positioned between the other end of the fiber (4) and the light-emitting diode (2) which emits the supply power.
Claim 3
Dependent Claim
148 words
2-. Measuring device according to claim 1, characterized in that in order to arrange two or more parallel channels in the device for transmitting two or more signals to or from the transducer section, two or more light-emitting diodes (18, 19) are located between two or more photo-diodes (20, 21) for the power supply and the one end of the fiber (4) and the two or more photo-diodes (16, 17) are located between two or more light-emitting diodes (14, 15) and the other end of the fiber (4), and that each channel is arranged to work with a shorter wavelength (λ 1 , λ 2 , λ 3 , λ 4 ) the closer to the fiber ends (4) the components are located, and that all the components which are located between the components of a channel which works with a certain wavelength are transparent to this wavelength.
Claim 4
Dependent Claim
67 words
Measuring device according to claim 1 or 2, characterized in that the light-emitting or photo-diodes are manufactured wholly or partially transparent to light of a certain wavelength by being made of a semiconductor material with a band gap E g > (where h is Planck's constant, c is velocity of light and λ is wavelength), for example by varying the Al-content in a semiconductor made of GaAlAs.
Claim 5
Dependent Claim
29 words
Measuring device according to any of the preceding claims, characterized in that the light-emitting and/ or photo-diodes are made partially transparent by being made as thin structures (10, 11).
Claim 6
Dependent Claim
77 words
Measuring device according to claim 3 or 4, characterized in that the light-emitting and/or photo-diodes are made so that the active material has been applied on or grown on a substrate (9) and that an opening (22) in the substrate has been etched/in the,region where the light passes through the transparent'component, the properties of the component thus being substantially determined by the applied layers and being independent of the thickness and band gap of the substrate (9).
Claim 7
Dependent Claim
39 words
Measuring device according to any of the preceding claims, characterized in that in the ray path between the light-emitting diode and the photo-diode is arranged a transparent insulating material (12), for example glass, silicon dioxide, aluminium oxide or sapphire.
Claim 8
Dependent Claim
36 words
Measuring device according to any of the preceding claims, characterized in that the photo-diode or diodes for power supply are located in the immediate vicinity of the light-emitting diode for the transmission of the measuring signal.
Claim 9
Dependent Claim
52 words
Measuring device according to any of the preceding claims, characterized in that the transformation from light to electric supply power is arranged by means of series-connected photo diodes, which may be integrated in one and the same semiconductor plate, laterally or applied on top of each other by epitoctic or MOCVD technique.
Claim 10
Dependent Claim
32 words
Measuring device according to claim 8, characterized in that the photo-diodes for power supply are integrated on the same semiconductor plate as the electronic circuit (7) for coding of the measuring signal.
Claim 11
Dependent Claim
41 words
Measuring device according to any of the preceding claims, characterized in that connections between the light-emitting diodes, the photo-diodes and the electronic circuit for coding the measuring signal are made by means of bonding and/or thick film and/or thin film technique.
Claim 12
Dependent Claim
32 words
Measuring device according to any of the preceding claims, characterized in that the coupling between the light-emitting diodes, the photo-diodes and the fiber (4) is made by means of a lens system.
References Cited (Backward Citations)
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