US5040869A
Expired / Lapsed
US
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Duping arrangement for laser distance measuring devices
Assignee: LFK-Lenkflugkörpersysteme GmbH
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Filing: 1990-07-02
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Granted: 1991-08-20
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Expires: 2010-07-02
Abstract
Abstract A duping arrangement is provided for a laser distance measuring device in which the illuminated object sends to the transmitter an identical but time-delayed signal and, therefore, supplies the transmitter with an incorrect distance reading. The duping arrangement comprises a wide-angle optical system formed by a bundle of glass fibers, a fiber delay line and a phase-conjugated optical element that is operated in an externally pumped mode or a self-pumped mode.
Inventors
- 👤 Hans Poisel
- 👤 Ernst-A. Seiffarth
- 👤 Gert Trommer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:11
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/48; G01S7/495
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
64 words
A duping arrangement for laser distance measuring devices in which a time-delayed signal identical to another signal sent by an illuminated object is sent to a transmitter and thus an incorrect distance reading is transmitted, comprising a wide-angle optical system, a phase conjugated element, and a fiber delay line operatively associated with the system and element so as to precisely reverse the optical path.
Claim 2
Dependent Claim
64 words
A duping arrangement for laser distance measuring devices in which a time-delayed signal identical to another signal sent by an illuminated object is sent to a transmitter and thus an incorrect distance reading is transmitted, comprising a wide-angle optical system, a phase conjugated element, and a fiber delay line operatively associated with the system and element so as to precisely reverse the optical path.
Claim 3
Dependent Claim
30 words
A duping arrangement according to claim 1, wherein the wide-angle optical system is formed of a bundle of a few glass fibers of a high numerical aperture without any lenses.
Claim 4
Dependent Claim
22 words
A duping arrangement according to claim 1, wherein the wide-angle optical system comprises a bundle of glass fibers spherically shaped end faces.
Claim 5
Dependent Claim
23 words
A duping arrangement according to claim 1, wherein a crystal of the phase-conjugated element is operated in an externally pumped or self-pumped mode.
Claim 6
Dependent Claim
30 words
A duping arrangement according to claim 4, wherein the wide-angle optical system is formed of a bundle of a few glass fibers of a high numerical aperture without any lenses.
Claim 7
Dependent Claim
23 words
A duping arrangement according to claim 4, wherein the wide-angle optical system comprises a bundle of glass fibers with spherically shaped end faces.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-19 | 1995-02-18 | 1995-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-19 | 1999-02-18 | 1999-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-19 | 2003-02-18 | 2003-08-20 | $7700.00 | Window Closed / Lapsed |