Patent US4596461A successfully refreshed from Google Patents.
US4596461A
Expired / Lapsed
US
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In-line, concurrent electromagnetic beam analyzer
Assignee: United States Department of the Navy
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Filing: 1984-02-16
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Granted: 1986-06-24
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Expires: 2004-02-16
Abstract
Abstract An in-line concurrent diagnostic analyzer for laser beams. An aperature mor splits the initial laser beam into two beams. The reflected portion of the initial beam follows path 1. Along path 1, an aliquot of the path 1 beam is reflected into a time history sensor. The majority of the path 1 beam ignites a plasma to mark beam arrival time at the target. The aperatured beam strikes and heats a calorimeter mirror, which records the energy of the incident beam. About 99 percent of the aperatured beam then passes to a specially designed (thin, with a short diffusion time) mirror attached to thermocouples to record the energy profile of the beam. The beam is reflected by the special mirror onto the target. A Third sensor detects any breakdown at the target surface.
Inventors
- 👤 John L. DeRosa
- 👤 Terence J. Wieting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:48
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/4257; G01K; G01K17/00; G01K17/003
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
60 words
A spatial distribution mirror for use in obtaining the beam profile of a laser beam, the front surface of said spatial distribution mirror being reflective, the rear surface having attached to it a plurality of thermocouples arranged in an array so that the distance between any two thermocouples is at least about twice the thickness of said spatial distribution mirror.
Claim 2
Dependent Claim
60 words
A spatial distribution mirror for use in obtaining the beam profile of a laser beam, the front surface of said spatial distribution mirror being reflective, the rear surface having attached to it a plurality of thermocouples arranged in an array so that the distance between any two thermocouples is at least about twice the thickness of said spatial distribution mirror.
Claim 3
Dependent Claim
12 words
The mirror of claim 1 wherein said mirror comprises copper or molybdenum.
Claim 4
Dependent Claim
20 words
The mirror of claim 2 wherein the rear surface of said mirror has attached to it at least 4 thermocouples.
Claim 5
Dependent Claim
23 words
The mirror of claim 3 wherein the distance between any two thermocouples is at least about five times the thickness of said mirror.
Claim 6
Dependent Claim
10 words
The mirror of claim 4 wherein said thermocouples comprise chromel/alumel.
Claim 7
Dependent Claim
178 words
An on-line laser beam analyzer for a system having a laser source and an irradiated target the components of which comprise: an aperture mirror; plasma vaporizing block; an ignition sensor; a plasma detector; a spatial distribution mirror, the front surface of which is reflective, the rear surface of which has attached to it a plurality of thermocouples arranged in an array so that the distance between any two thermocouples is at least about twice the thickness of said spatial distribution mirror; said components being arranged so that light emitted by said laser source is split by said aperture mirror to form a redirected beam and an aperture beam, said redirected beam strikes and ignites a plasma at said plasma vaporizing block, the ignition of which is sensed by said sensor, said apertured beam strikes said spatial distribution mirror and strikes said irradiated target after striking said spatial distribution mirror and being reflected therefrom, said plasma detector being in a position such that any plasma formation at the surface of said irradiated target is detected by said plasma detector.
Claim 8
Dependent Claim
178 words
An on-line laser beam analyzer for a system having a laser source and an irradiated target the components of which comprise: an aperture mirror; plasma vaporizing block; an ignition sensor; a plasma detector; a spatial distribution mirror, the front surface of which is reflective, the rear surface of which has attached to it a plurality of thermocouples arranged in an array so that the distance between any two thermocouples is at least about twice the thickness of said spatial distribution mirror; said components being arranged so that light emitted by said laser source is split by said aperture mirror to form a redirected beam and an aperture beam, said redirected beam strikes and ignites a plasma at said plasma vaporizing block, the ignition of which is sensed by said sensor, said apertured beam strikes said spatial distribution mirror and strikes said irradiated target after striking said spatial distribution mirror and being reflected therefrom, said plasma detector being in a position such that any plasma formation at the surface of said irradiated target is detected by said plasma detector.
Claim 9
Dependent Claim
12 words
The analyzer of claim 6 wherein said spatial distribution mirror comprises copper.
Claim 10
Dependent Claim
22 words
The analyzer of claim 7 wherein the rear surface of said spatial distribution mirror has attached to it at least 4 thermocouples.
Claim 11
Dependent Claim
25 words
The analyzer of claim 8 wherein the distance between any two thermocouples is at least about five times the thickness of said spatial distribution mirror.
Claim 12
Dependent Claim
10 words
The analyzer of claim 9 wherein said thermocouples comprise chromel/alumel.
Claim 13
Dependent Claim
54 words
The analyzer of claim 6 further comprising a calorimeter mirror, the rear surface of which has attached to it at least one thermocouple, said mirror being positioned so that light reflected from said spatial distribution calorimeter mirror strikes said calorimeter mirror and strikes said target after striking said calorimeter mirror and being reflected therefrom.
Claim 14
Dependent Claim
20 words
The analyzer of claim 6 further comprising a focusing mirror for directing said apertured beam toward said plasma vaporizing block.
Claim 15
Independent Claim
135 words
A method of obtaining diagnostic information from a laser beam, the steps of which comprise: selecting a spatial distribution mirror, the front surface of which is reflective, the rear surface of which has attached a plurality of thermocouples arranged in an array so that the distance between any two thermocouples is at least about twice the thickness of said spatial distribution mirror; choosing a target; causing light emitted by a laser source to be split by an aperture mirror to form a redirected beam and an apertured beam; causing said redirected beam to strike and ignite a plasma vaporizing block; detecting the ignition of said plasma vaporizing block; causing said apertured beam to strike said spatial distribution mirror and be reflected therefrom; causing the light reflected by said spatial distribution mirror to strike said target.
Claim 16
Independent Claim
135 words
A method of obtaining diagnostic information from a laser beam, the steps of which comprise: selecting a spatial distribution mirror, the front surface of which is reflective, the rear surface of which has attached a plurality of thermocouples arranged in an array so that the distance between any two thermocouples is at least about twice the thickness of said spatial distribution mirror; choosing a target; causing light emitted by a laser source to be split by an aperture mirror to form a redirected beam and an apertured beam; causing said redirected beam to strike and ignite a plasma vaporizing block; detecting the ignition of said plasma vaporizing block; causing said apertured beam to strike said spatial distribution mirror and be reflected therefrom; causing the light reflected by said spatial distribution mirror to strike said target.
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) | 1989-06-23 | 1989-12-23 | 1990-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-23 | 1993-12-23 | 1994-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-23 | 1997-12-23 | 1998-06-24 | $7700.00 | Window Closed / Lapsed |