Electric lamp and discharge devices – With movable electrode or shield – Movable envelope wall
Patent
1977-09-21
1980-04-29
Demeo, Palmer C.
Electric lamp and discharge devices
With movable electrode or shield
Movable envelope wall
3132316, 331 945G, 331 945PE, H01J 188, H01J 6128, H01S 303
Patent
active
042008190
ABSTRACT:
The nozzle and laser channel walls for a supersonic electrical discharge gas laser are formed from fully contoured single pieces of dielectric material. The axially symmetric, two-dimensional wall contours of the combined nozzle and laser channel describe a continuous extension of the subsonic flow plenum, into which the gas is initially introduced, and which is located upstream of the combined nozzle-laser channel. A high precision portion of the contour of the combined nozzle-laser channel extends from a beginning point in the nozzle inlet region near the throat to a termination point which is beyond the nozzle exit plane a distance equal to approximately one-half of the nozzle exit height. The high precision portion is a region of continuous curvature supersonic expansion. Beyond the termination point of the continuous curvature region the walls of the combined nozzle-laser channel are flat and diverge at a constant angle, relative to the flow axis of the laser, to the end of the combined nozzle-laser channel. Flat, flush mounted electrodes are positioned in the flat walled section of the laser channel, forming a discharge region with maximum flow density uniformity and minimum boundary layer thickness. In one embodiment, one electrode is a grid, with bars normal to the direction of flow, and is mounted in a laser channel wall section which is capable of rotation.
REFERENCES:
patent: 3543179 (1970-11-01), Wilson
patent: 3882416 (1975-05-01), Borghi et al.
patent: 3906392 (1975-09-01), Mann
patent: 3962656 (1976-06-01), Peressini
patent: 3995189 (1976-11-01), Haslund
patent: 4011521 (1977-03-01), Kantrowitz et al.
patent: 4042892 (1977-08-01), Fenneman
DeMeo Palmer C.
The Boeing Company
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