US4581528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber optical measuring device for measuring dynamic movements
Assignee: Takaoka Toko Co Ltd
•
Filing: 1983-05-26
•
Granted: 1986-04-08
•
Expires: 2003-05-26
Abstract
Abstract A fiber optical measuring device for measuring dynamic movements between a boundary surface of an optical fiber and a boundary surface of a movement-sensing body. The optical fiber is adapted to transmit optical energy to and from the boundary surfaces and at least one of the boundary surfaces includes a photo-luminescent material, the optical energy reflected from the boundary surface of the body being dependent on the relative position between the two boundary surfaces.
Inventors
- 👤 Torgny Brogardh
- 👤 Bertil Hok
- 👤 Christer Ovren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:28
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/28; G01D5/30
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
160 words
In a fiber optical measuring device for sensing dynamic movements between two boundary surfaces where a first of said two boundary surfaces constitutes an end surface of an elongated optical fiber and a second of said boundary surfaces constitutes the surface of a movement-sensing body, said optical fiber being adapted to transmit optical energy to and from said first and second boundary surfaces, the improvement wherein at least one of said first and second boundary surfaces is constituted by a photo-luminescent material, wherein said first and second boundary surfaces are so arranged that the optical energy reflected from said second boundary surface becomes dependent on the relative position between said boundary surfaces, wherein said movement-sensing body is secured to said optical fiber and comprises a resilient portion permitting relative movements between said two boundary surfaces, and wherein at least one of said boundary surfaces extends at angle with the elongated direction of said optical fiber which is different from 90°.
Claim 2
Dependent Claim
160 words
In a fiber optical measuring device for sensing dynamic movements between two boundary surfaces where a first of said two boundary surfaces constitutes an end surface of an elongated optical fiber and a second of said boundary surfaces constitutes the surface of a movement-sensing body, said optical fiber being adapted to transmit optical energy to and from said first and second boundary surfaces, the improvement wherein at least one of said first and second boundary surfaces is constituted by a photo-luminescent material, wherein said first and second boundary surfaces are so arranged that the optical energy reflected from said second boundary surface becomes dependent on the relative position between said boundary surfaces, wherein said movement-sensing body is secured to said optical fiber and comprises a resilient portion permitting relative movements between said two boundary surfaces, and wherein at least one of said boundary surfaces extends at angle with the elongated direction of said optical fiber which is different from 90°.
Claim 3
Dependent Claim
22 words
A fiber optical measuring device according to claim 1, wherein said movementsensing body comprises a seismic mass mounted on said resilient portion.
Claim 4
Dependent Claim
40 words
A fiber optical measuring device according to claim 1, wherein said movementsensing body is constructed from a semiconductor material chosen from the group consisting of Al x Ga l-x As and In x Ga l-x As y P l-y .
Claim 5
Dependent Claim
16 words
A fiber optical measuring device according to claim 3, wherein the semiconductor material constitutes epitaxial layers.
Claim 6
Dependent Claim
23 words
A fiber optical measuring device according to claim 1, wherein the end surface of said optical fiber is coated with a photo-luminescent material.
Claim 7
Dependent Claim
21 words
A fiber optical measuring device according to claim 1, wherein the optical fiber includes a photo-luminescent material near its end surface.
Claim 8
Dependent Claim
17 words
A fiber optical measuring device according to claim 1, wherein the photo-luminescent material consists of metal ions.
Claim 9
Dependent Claim
53 words
A fiber optical measuring system including a measuring device according to claim 1, in which the measuring device is so arranged that the relative position between said optical fiber and said movementsensing body determines the transmission of optical energy from the boundary surfaces which is derived from photo-luminescence, back into said optical fiber.
Claim 10
Dependent Claim
44 words
A fiber optical measuring system according to claim 8, including a means for dividing the optical energy reflected into the fiber into a component which is substantially derived from said reflected optical energy and a component which is substantially derived from said photo-luminescent energy.
Claim 11
Dependent Claim
26 words
A fiber optical measuring system according to claim 9, including an electronic filter through which the signal transformed from reflected optical energy into electrical energy passes.
Claim 12
Dependent Claim
36 words
A fiber optical measuring system according to claim 9, including a control circuit to which an electrical signal derived from the photo-luminescent component is fed for control of exciting optical energy fed into said optical fiber.
Claim 13
Dependent Claim
33 words
A fiber optical measuring system according to claim 9, including an electronic circuit for generating a quotient between the signal components derived from reflected and photo-luminescent energy, respectively, after transformation into electrical signals.
Claim 14
Dependent Claim
69 words
A fiber optical measuring system including a measuring device according to claim 1, in which the measuring device is so arranged that the relative position between said optical fiber and said movementsensing body affects the transmission of the reflected and the photo-luminescent energy back into said optical fiber, whereby the influence of the energy due to luminescence can be smaller than the influence of the energy due to reflections.
Claim 15
Dependent Claim
44 words
A fiber optical measuring system according to claim 13, including a means for dividing the optical energy reflected into the fiber into a component which is substantially derived from said reflected optical energy and a component which is substantially derived from said photo-luminescent energy.
Claim 16
Dependent Claim
26 words
A fiber optical measuring system according to claim 14, including an electronic filter through which the signal transformed from reflected optical energy into electrical energy passes.
Claim 17
Dependent Claim
36 words
A fiber optical measuring system according to claim 14, including a control circuit to which an electrical signal derived from the photo-luminescent component is fed for control of exciting optical energy fed into said optical fiber.
Claim 18
Dependent Claim
33 words
A fiber optical measuring system according to claim 14, including an electronic circuit for generating a quotient between the signal components derived from reflected and photo-luminescent energy, respectively, after transformation into electrical signals.
References Cited (Backward Citations)
US4083254A
Cited
US4281245A
Cited
US4356448A
Cited
US4376890A
Cited
US4451730A
Cited
US4473747A
Cited
US4493995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |