Patent US3654569A successfully refreshed from Google Patents.
US3654569A
Expired / Lapsed
US
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Aerodynamic window
Assignee: RTX Corp
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Filing: 1968-12-23
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Granted: 1972-04-04
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Expires: 1988-12-23
Abstract
Abstract A gas dynamic laser emits an output beam from a low pressure region downstream of a nozzle section through which gases are expanded which contain the constituents necessary to obtain a lasing action. A gas dynamic laser employs the principles of kinetic relaxation of excited states of specific gas species to effect a population inversion of the excited states to obtain lasing action. An oscillator directs a low beam into said low pressure lasing region, and through an optic arrangement the beam is amplified and directed out of an opening in the gas dynamic laser. Under normal circumstances the provision of such an opening would incur a flow of air from the ambient pressure to the low pressure within the laser cavity. The opening is connected to an aerodynamic window. The window has an unobstructed passage leading from the low pressure region of the gas dynamic laser to its exterior in which pressures are set up permitting passage of the laser beam, yet preventing or minimizing the low of exterior air into the cavity. The pressures are set up by an intersecting passageway having a pump supplying high pressure fluid and a nozzle construction which provides the proper predetermined pressures.
Inventors
- 👤 George F Hausmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:29
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/02; H01S3/03; H01S3/034; H01S3/0343
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
219 words
In combination, a gas laser comprising a main duct, means providing a gas containing constituents necessary to obtain a lasing action, expansion means in said duct, a lasing region of low pressure downstream of said expansion means, reflector means in said main duct forming a laser output beam, an outlet in said main duct forming an exit for the reflected output laser beam, an outlet duct connected to said main duct and extending away therefrom around said outlet in said main duct, an auxiliary duct connected to said outlet duct and extending transversely thereacross, means providing supersonic flow through said auxiliary duct to form by compression waves a predetermined pressure difference across said exit duct, said auxiliary duct being formed at one part on one side of said outlet duct as a Laval nozzle with its open exhaust end being connected to the outlet duct by a short duct section having one side extending in a direction parallel to the center line of the Laval nozzle while the opposite side is formed having an angle with respect to the center line of the Laval nozzle, said auxiliary duct being formed on the other side of said outlet duct as a passage extending at an angle to said outlet duct which is a continuation of the angle set forth above.
Claim 2
Dependent Claim
219 words
In combination, a gas laser comprising a main duct, means providing a gas containing constituents necessary to obtain a lasing action, expansion means in said duct, a lasing region of low pressure downstream of said expansion means, reflector means in said main duct forming a laser output beam, an outlet in said main duct forming an exit for the reflected output laser beam, an outlet duct connected to said main duct and extending away therefrom around said outlet in said main duct, an auxiliary duct connected to said outlet duct and extending transversely thereacross, means providing supersonic flow through said auxiliary duct to form by compression waves a predetermined pressure difference across said exit duct, said auxiliary duct being formed at one part on one side of said outlet duct as a Laval nozzle with its open exhaust end being connected to the outlet duct by a short duct section having one side extending in a direction parallel to the center line of the Laval nozzle while the opposite side is formed having an angle with respect to the center line of the Laval nozzle, said auxiliary duct being formed on the other side of said outlet duct as a passage extending at an angle to said outlet duct which is a continuation of the angle set forth above.
Claim 3
Independent Claim
142 words
A device for providing an aerodynamic window between two regions at different pressures including in combination, a passageway having an inlet and an outlet, said inlet being connected to one region and said outlet being connected to another region, a first transverse opening in said passageway, a Laval nozzle, conduit means connecting the exit of said nozzle to said first transverse opening, a compression wave forming surface on one wall of said conduit means upstream of said first transverse opening, a second transverse opening being positioned in said passageway across from the first transverse opening, a collection duct extending away from said second transverse opening, a pump connected to the inlet of said nozzle, a shock wave created by flow over said compression wave forming surface extends through the first transverse opening and intersects the opposite edge of the second transverse opening.
Claim 4
Independent Claim
142 words
A device for providing an aerodynamic window between two regions at different pressures including in combination, a passageway having an inlet and an outlet, said inlet being connected to one region and said outlet being connected to another region, a first transverse opening in said passageway, a Laval nozzle, conduit means connecting the exit of said nozzle to said first transverse opening, a compression wave forming surface on one wall of said conduit means upstream of said first transverse opening, a second transverse opening being positioned in said passageway across from the first transverse opening, a collection duct extending away from said second transverse opening, a pump connected to the inlet of said nozzle, a shock wave created by flow over said compression wave forming surface extends through the first transverse opening and intersects the opposite edge of the second transverse opening.
Claim 5
Dependent Claim
17 words
A device as set forth in claim 2, wherein the compression wave forming surface is a wedge.
Claim 6
Dependent Claim
18 words
A device as set forth in claim 2, wherein the compression wave forming surface is a curved surface.
Claim 7
Dependent Claim
25 words
A device as set forth in claim 2, wherein the wall opposite the compression wave forming surface is formed as an expansion wave forming surface.
Claim 8
Dependent Claim
39 words
A device as set forth in claim 5, wherein the compression wave forming surface and expansion wave forming surface extend from the exit of said nozzle at a substantially constant spacing to the first transverse opening in the passageway.
Claim 9
Dependent Claim
20 words
A device as set forth in claim 2, wherein the collection duct extends at an angle away from the passageway.
Claim 10
Dependent Claim
18 words
A device as set forth in claim 7, wherein said angle is approximately that of the wedge surface.
Claim 11
Dependent Claim
37 words
A device as set forth in claim 2, wherein a subsonic diffuser is located downstream of said collection duct, said diffuser having an inlet and outlet, said collection duct being connected to the inlet of said diffuser.
Claim 12
Dependent Claim
48 words
A device as set forth in claim 9, wherein the exit of the subsonic diffuser is connected to the inlet of the pump, pressure ratio across shock wave and absolute pressure on vacuum side adjusted by pump pressure, nozzle area ratio, and angle of compression wave forming surface.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |