US3908457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High energy laser power meter
Assignee: United States Department of the Navy
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Filing: 1974-06-07
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Granted: 1975-09-30
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Expires: 1994-06-07
Abstract
Abstract A device for measuring the power of a laser beam by measuring the rate of sublimation of a subliming solid irradiated by the laser.
Inventors
- 👤 Michael C Drong
- 👤 William M Moeny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:10
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
135 words
A system for directly measuring the output beam power of high energy lasers and other directed high energy devices comprising: a. a target means made from a subliming solid material for entrapping and absorbing the energy of an incident output beam from a high energy device being measured; b. the incident energy from said output beam being converted to heat within said subliming solid target means, changing a portion of the subliming solid material directly into gas; c. means for venting said gas from said target means; d. means for measuring the rate of change of weight of said subliming solid target means to compute the incident power of said output beam, the rate of vaporization of said subliming solid target means being proportional to the rate of power absorption of the subliming solid material.
Claim 2
Independent Claim
135 words
A system for directly measuring the output beam power of high energy lasers and other directed high energy devices comprising: a. a target means made from a subliming solid material for entrapping and absorbing the energy of an incident output beam from a high energy device being measured; b. the incident energy from said output beam being converted to heat within said subliming solid target means, changing a portion of the subliming solid material directly into gas; c. means for venting said gas from said target means; d. means for measuring the rate of change of weight of said subliming solid target means to compute the incident power of said output beam, the rate of vaporization of said subliming solid target means being proportional to the rate of power absorption of the subliming solid material.
Claim 3
Dependent Claim
14 words
A system as in claim 1 wherein said subliming solid material is frozen CO2.
Claim 4
Dependent Claim
34 words
A system as in claim 1 wherein said subliming solid material comprises any of the following solid sublimates: CO2, C2H2, SiF4, SF6, SeF6, TeF6, C, UF6, PCl5, Al2C6, SeO2, ZrCl4, P4F10, and combinations thereof.
Claim 5
Dependent Claim
75 words
A system as in claim 1 wherein said means for measuring the rate of change of weight of the subliming solid material to compute the incident power of the high energy device output beam, comprises: a. a transducer means for measuring the weight of said subliming solid target means; b. remote readout, recording and timing means connected to said transducer means for measuring the rate of change of weight of the subliming solid target material.
Claim 6
Dependent Claim
16 words
A system as in claim 1 wherein said subliming solid target is a hohlraum type target.
Claim 7
Dependent Claim
147 words
A system as in claim 1 wherein said subliming solid target comprises: a. an enclosed cavity having interior walls which consist of subliming solid material; b. a small beam entrance hole in one wall of said enclosed cavity; c. a deflector means, also of subliming solid material, affixed to the interior rear wall of said cavity directly opposite said beam entrance hole for scattering the radiation energy from said beam throughout said cavIty, said deflector means causing sublimation to occur uniformly throughout the cavity and preventing energy losses due to beam radiation being reflected back out through the beam entrance hole, said deflector means also preventing excessive sublimation of said rear wall directly opposite to the beam entrance hole; d. ventilation means provided through the walls of said cavity for eliminating any of the gas as it is generated by sublimation of said subliming solid target material.
Claim 8
Dependent Claim
23 words
A system as in claim 6 wherein said ventilation means is shielded to prevent any escape of scattered radiation from within said cavity.
Claim 9
Dependent Claim
14 words
A system as in claim 6 wherein the shape of said cavity is spherical.
Claim 10
Independent Claim
68 words
A method for directly measuring the output beam power of high energy lasers and other directed high energy devices, comprising: a. directing the output beam of the high energy device to be measured into a cavity within a target made from a subliming solid material; b. measuring the rate of change of the weight of the subliming solid target to determine the incident power of said output beam.
Claim 11
Independent Claim
68 words
A method for directly measuring the output beam power of high energy lasers and other directed high energy devices, comprising: a. directing the output beam of the high energy device to be measured into a cavity within a target made from a subliming solid material; b. measuring the rate of change of the weight of the subliming solid target to determine the incident power of said output beam.
Claim 12
Dependent Claim
36 words
The method as in claim 9 wherein said subliming solid material is selected from any of the following solid sublimates: CO2, C2H2, SiF4, SF6, SeF6, TeF6, C, UF6, PCl5, Al2C6, SeO2, ZrCl4, P4F10, and combinations thereof.
References Cited (Backward Citations)
US3670570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |