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US4980554A
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Laser line identifier
Assignee: United States Department of the Army
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Filing: 1989-03-31
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Granted: 1990-12-25
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Expires: 2009-03-31
Abstract
Abstract The Laser Line Identifier (LLI) is a real-time device which can indicate wavelengths of the laser radiations. LLI mainly consists of a beam splitter, narrow bandwidth transmission filters and detectors. The filters and the detectors form a unique pair so that a signal detected at a particular detector can only mean the radiation of a certain wavelength. The detectors are hardwired to a set of indicators such as a set of colored lights or a voice recording so that the wavelength of the radiation is clearly indicated even to a non-technical person.
Inventors
- 👤 Byong H. Ahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:49
CPC Classifications
G; G01; G01J; G01J9/00; G01J3/00; G01J3/12; G01J2003/1226; G01J2003/123; G01J2003/1239
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
118 words
A laser line identifier comprising: a housing defining an aperture to admit laser radiation; focussing means mounted near said aperture to focus said laser radiation into a main beam of tightly collimated radiation; a plurality of extremely narrow pass band reflection type optical filters, each tuned to a different frequency component of said main beam and positioned to serially reflect said main beam to a terminal absorber; a detector located behind each of said filters in the path of radiation passed by said filter; and a primary alarm means coupled to each one of said detectors for generating a humanly perceptible signal, when said component strikes said one detector, and thereby identify the laser responsible for said component.
Claim 2
Dependent Claim
118 words
A laser line identifier comprising: a housing defining an aperture to admit laser radiation; focussing means mounted near said aperture to focus said laser radiation into a main beam of tightly collimated radiation; a plurality of extremely narrow pass band reflection type optical filters, each tuned to a different frequency component of said main beam and positioned to serially reflect said main beam to a terminal absorber; a detector located behind each of said filters in the path of radiation passed by said filter; and a primary alarm means coupled to each one of said detectors for generating a humanly perceptible signal, when said component strikes said one detector, and thereby identify the laser responsible for said component.
Claim 3
Dependent Claim
60 words
The identifier according to claim 1, further including: a beam splitter located near said focussing means in the path of said main beam to separate said beam into a first beam of far-infrared radiation and a second beam of near visible radiation including near infrared and ultraviolet, each beam including a portion of said filters and a separate terminal absorber.
Claim 4
Dependent Claim
43 words
The identifier according to claim 1, wherein: said terminal absorber is a wide-band detector to sense any remaining frequency components in said beam; and a secondary alarm means to aurally announce the presence of said beam is coupled to said wide band detector.
Claim 5
Dependent Claim
16 words
The identifier according to claim 1, wherein: said primary alarm means is a coded light source.
Claim 6
Dependent Claim
16 words
The identifier according to claim 3, wherein: said secondary alarm means is a coded sound source.
Claim 7
Dependent Claim
21 words
The identifier according to claim 1, wherein: said primary alarm means includes a means to play a prerecorded verbal sound message.
Claim 8
Dependent Claim
42 words
The identifier according to claim 1, wherein: said primary alarm means includes an electronic signal generator, means to broadcast said signal over a limited range and azimuth angle and remotely located means to convert said electronic signal to said humanly perceptible signal.
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) | 1993-12-24 | 1994-06-25 | 1994-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-24 | 1998-06-25 | 1998-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-24 | 2002-06-25 | 2002-12-25 | $7700.00 | Window Closed / Lapsed |