Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1997-07-23
1999-07-27
Paschall, Mark
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219502, 219494, 356379, 356357, 25055921, H05B 102
Patent
active
059285451
ABSTRACT:
The apparatus and method measures the shrinkage of rocket motor propellant hat is caused during curing and may control this shrinkage by thermally expanding it to prevent creation of voids and cracks. The apparatus heats the propellant compound during curing. A laser emits radiation onto the compound and a detector receives reflected radiation from the compound and provides signals representative of the size of the volume of the compound. An interconnected indicator provides readouts representative of the size. A temperature controller coupled to a processor and a heater controls the heating of the compound to regulate its thermal expansion and consequent volume. The method calls for heating the compound during curing and radiating it with a laser. Reflected radiation is detected to provide signals representative of the volume. Readouts of the signals represent the relative size of the compound. The signals may be used to control a heater that supplies heat to correspond the compound's curing shrinkage to thermal expansion during the curing process to prevent the creation of voids and cracks. These signals also may be used to control curing in a production oven of other rocket motors made from the same or similar batches of propellant coumpound.
REFERENCES:
patent: 4417817 (1983-11-01), Bohme et al.
patent: 5251482 (1993-10-01), Bates et al.
patent: 5652432 (1997-07-01), Yaginuma
Byrd Stanley G.
Swett Herbert M.
Bokar Gregory M.
Church Stephen J.
Paschall Mark
Sliwka Melvin J.
The United States of America as represented by the Secretary of
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