Measuring and testing – Ordnance and projectile
Patent
1982-03-08
1984-03-06
Frankfort, Charles
Measuring and testing
Ordnance and projectile
73 35, G01L 514
Patent
active
044346557
ABSTRACT:
A black powder flamespread tester is disclosed in which powder to be qualed is packed in a sample tube provided with a plurality of sight holes. Light sensors are disposed adjacent each sight hole and emit signals upon flame front passage of the sight hole. The sample tube is removably secured to an ignition head which contains an electrically actuated pyrotechnic squib. The squib discharges gases into a transition chamber from which the gases pass through orifices in an orifice plate, through a void volume into the black powder bed, which ignites the black powder. The ignition head is removably secured to a tester chamber in which the sample holder is received. Light sensors are housed in a separate fin which is removably received in an aperture in the tester chamber wall. After the squib gas ignites the powder bed, the output signal of each light sensor increases to saturation as the flame front passes its respective sight hole. The output signal from each light sensor is conditioned and summed to form one output signal. A plot of the summed output signal versus time is prepared, which shows the time of passage of the flame front through the black powder from each light sensor to the next. The flamespread rate is determined by dividing the known distance between light sensors by the time of passage of the flame front between respective light sensors.
REFERENCES:
patent: 2920479 (1960-01-01), Kane
patent: 3201973 (1965-08-01), Fitzgerald
patent: 3685347 (1972-08-01), Hildebrant
patent: 3946607 (1976-03-01), Panella
Ingram Larry S.
Messina Neale A.
Summerfield Martin
Corr Denis E.
Frankfort Charles
Gibson Robert P.
Lane Anthony T.
The United States of America as represented by the Secretary of
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