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US4868768A
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Optical absorption measurement system
Assignee: GOVERNMENT OF UNITED STATES AS REPRESENTED BY DEPARTMENT OF ENERGY
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Filing: 1986-09-17
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Granted: 1989-09-19
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Expires: 2006-09-17
Abstract
Abstract The system of the present invention contemplates a non-intrusive method for measuring the temperature rise of optical elements under high laser power optical loading to determine the absorption coefficient. The method comprises irradiating the optical element with a high average power laser beam, viewing the optical element with an infrared camera to determine the temperature across the optical element and calculating the absorption of the optical element from the temperature.
Inventors
- 👤 Vaughn G. Draggoo
- 👤 Richard G. Morton
- 👤 Richard H. Sawicki
- 👤 Horst D. Bissinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:25
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/171; G01N25/00; G01N25/72; G01N2021/1765
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
70 words
A method for measuring absorption of an optical element comprising: irradiating the optical element with a high average power laser beam to increase a temperature thereof; examining the surface of the optical element to determine the infrared energy being emitted therefrom as a result of the increase in temperature; determining the temperature across said optical element from said examination; and calculating the absorption of the optical element from said temperature.
Claim 2
Independent Claim
70 words
A method for measuring absorption of an optical element comprising: irradiating the optical element with a high average power laser beam to increase a temperature thereof; examining the surface of the optical element to determine the infrared energy being emitted therefrom as a result of the increase in temperature; determining the temperature across said optical element from said examination; and calculating the absorption of the optical element from said temperature.
Claim 3
Independent Claim
71 words
A method for measuring surface absorption of an optical element comprising: irradiating the optical element with a high average power laser beam to increase a temperature thereof; examining the surface of the optical element with an infrared device to produce a representation of the temperature cross the optical element; determining the temperature across said optical element from aid representation; and calculating the surface absorption of the optical element rom said temperature.
Claim 4
Independent Claim
71 words
A method for measuring surface absorption of an optical element comprising: irradiating the optical element with a high average power laser beam to increase a temperature thereof; examining the surface of the optical element with an infrared device to produce a representation of the temperature cross the optical element; determining the temperature across said optical element from aid representation; and calculating the surface absorption of the optical element rom said temperature.
Claim 5
Dependent Claim
18 words
The method of claim 2 further including producing from said representation a temperature distribution across said optical element.
Claim 6
Dependent Claim
30 words
The method of claim 2 further including calculating the surface absorption, utilizing a formula comprising: ##EQU2## where: Alpha=coating absorption, T=peak temperature (°C.), R=laser beam radius (cm), and p=laser power (watts).
Claim 7
Dependent Claim
18 words
The method of claim 2 further including selecting the surface absorption to match a peak temperature excursion observed.
Claim 8
Independent Claim
77 words
A method for measuring surface absorption of an optical element, comprising: irradiating the optical element with a high average power laser beam to increase a temperature thereof; examining the optical element with an infrared device to produce an image of the optical element; determining the temperature across said optical element from said image; and calculating the surface absorption utilizing a formula comprising: ##EQU3## where: Alpha=coating absorption, T=peak temperature (°C.), R=laser beam radius (cm), and p=laser power (watts).
Claim 9
Independent Claim
77 words
A method for measuring surface absorption of an optical element, comprising: irradiating the optical element with a high average power laser beam to increase a temperature thereof; examining the optical element with an infrared device to produce an image of the optical element; determining the temperature across said optical element from said image; and calculating the surface absorption utilizing a formula comprising: ##EQU3## where: Alpha=coating absorption, T=peak temperature (°C.), R=laser beam radius (cm), and p=laser power (watts).
Claim 10
Dependent Claim
18 words
The method of claim 6 further including producing from said image a temperature distribution across said optical element.
Claim 11
Independent Claim
82 words
A method for measuring surface and/or bulk absorption of an optical element in a high average power laser beam comprising: irradiating the optical element with a high average power laser beam to increase a temperature thereof; viewing the surface of the optical element with an infrared camera; producing a picture from said camera; scanning the picture to determine a temperature profile across said optical element; and matching the temperature profile by proper selection of surface and bulk absorption of the optical element.
Claim 12
Independent Claim
82 words
A method for measuring surface and/or bulk absorption of an optical element in a high average power laser beam comprising: irradiating the optical element with a high average power laser beam to increase a temperature thereof; viewing the surface of the optical element with an infrared camera; producing a picture from said camera; scanning the picture to determine a temperature profile across said optical element; and matching the temperature profile by proper selection of surface and bulk absorption of the optical element.
Claim 13
Independent Claim
68 words
A system for measuring absorption of an optical element comprising: an infrared camera to view the surface of the optical element to produce an image of the infrared energy being emitted therefrom when irradiated with a high average power laser beam; means for determining from a image a temperature profile across said optical element; and means for calculating the absorption of the optical element from said temperature profile.
Claim 14
Independent Claim
68 words
A system for measuring absorption of an optical element comprising: an infrared camera to view the surface of the optical element to produce an image of the infrared energy being emitted therefrom when irradiated with a high average power laser beam; means for determining from a image a temperature profile across said optical element; and means for calculating the absorption of the optical element from said temperature profile.
Claim 15
Independent Claim
69 words
A method for measuring absorption of an optical element comprising: irradiating the optical element with a high average power laser beam to increase the temperature thereof; producing a representation of the temperature across the optical element; determining the temperature across the optical element from representation; and calculating the surface absorption utilizing a formula comprising: ##EQU4## where: Alpha=coating absorption, T=peak temperature (°C.), R=laser beam radius (cm), and p=laser power (watts).
Claim 16
Independent Claim
69 words
A method for measuring absorption of an optical element comprising: irradiating the optical element with a high average power laser beam to increase the temperature thereof; producing a representation of the temperature across the optical element; determining the temperature across the optical element from representation; and calculating the surface absorption utilizing a formula comprising: ##EQU4## where: Alpha=coating absorption, T=peak temperature (°C.), R=laser beam radius (cm), and p=laser power (watts).
Claim 17
Independent Claim
78 words
A system for measuring absorption of an optical element comprising: means for irradiating the optical element with a high average power laser beam to increase the temperature thereof; means for producing a representation of the temperature across the optical element; means for determining the temperature across the optical element from said representation; and means for calculating the surface absorption utilizing a formula comprising: ##EQU5## where: Alpha=coating absorption, T=peak temperature (°C.), R=laser beam radius (cm), and p=laser power (watts).
Claim 18
Independent Claim
78 words
A system for measuring absorption of an optical element comprising: means for irradiating the optical element with a high average power laser beam to increase the temperature thereof; means for producing a representation of the temperature across the optical element; means for determining the temperature across the optical element from said representation; and means for calculating the surface absorption utilizing a formula comprising: ##EQU5## where: Alpha=coating absorption, T=peak temperature (°C.), R=laser beam radius (cm), and p=laser power (watts).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |