Fiber optic solid/hybrid rocket motor grain regression rate sens

Details Fiber optic solid/hybrid rocket motor grain regression rate sens Fiber optic solid/hybrid rocket motor grain regression rate sens

1990-06-04

1992-04-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Flame light source

25022711, 25022715, 25022728, 340578, H01J 516

Patent

active

051071290

ABSTRACT:
In one embodiment a bundle of optic fibers of different lengths are inserted through the case wall of a solid fuel or a hybrid rocket motor and extends through the wall of the fuel grain to the edge of the bore in center thereof. As the grain burns in a normal manner, from the center toward the outer periphery of the case, the bright flame of ignition is seen at the end of the fiber optic fiber adjacent to the flame. The length of each fiber in the bundle is used to determine the burn rate and amount of grain left to ignite. In another embodiment different length fibers of a bundle are looped into the grain and back to the exterior of the case and light emitting diodes are positioned at one end of each fiber with a light-detecting means at the other end. The light through the diodes is monitored to detect a no-light condition which exists when a fiber is destroyed by the burn. In yet another embodiment a single optic fiber is used with a light source and a light reception means at one end. As the end of the fiber is destroyed by the ignition of the grain, the time it takes the light from the light source to return to the light sensor is used to establish the burn rate and amount of remaining fuel grain at any given time during the burn.

REFERENCES:
patent: 3201973 (1965-08-01), Fitzgerald et al.
patent: 4420253 (1983-12-01), Pryor
patent: 4843234 (1989-06-01), Berthold et al.
patent: 4865416 (1989-09-01), Pratt
patent: 4884434 (1989-12-01), Satake et al.

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