Sequential detonation of explosions

Details Sequential detonation of explosions Sequential detonation of explosions

F - Mech Eng,Light,Heat,Weapons

42

C

342/19

F42C 11/06 (2006.01) F42D 1/055 (2006.01)

Patent

CA 1188777

ABSTRACT A system for the sequential detonation of explosions. There is a series of activating modules connected in parallel with a shot exploder. The shot exploder supplies a series of calibrating signals. The first calibrating signal calibrates the first module in the series and successive calibrating signals calibrate successive modules. After each module has been calibrated it supplies a mode switching signal to the next module, so that the said next module responds to the next calibrating signal and is calibrated by it. Each module has an internal oscillator (14), a calibrating counter (22), a timing counter (20) and a comparator (24). The timing signals of the oscillator (14) are routed to the counters (20, 22) via gates (16, 18). A mode control section (42) supplies a calibration mode signal to the gate (18) for the calibrating counter (22) and a timing mode signal to the gate (16) for the timing counter (20). The mode control section (42) supplies the calibration mode signal when it receives a mode switching signal at an input terminal (40) and a calibrating signal from the shot exploder via a pulse discriminator (34). The timing mode signal is supplied at the end of the calibrating signal. A mode switching signal is then also supplied to the next module via an output terminal (50). In the timing mode, the count of the timing counter (20) is compared with that of the calibrating counter (22) by a comparator (24). When the counts are equal the comparator (24) resets the timing counter (20) and increases the count of a delay counter (26). When the delay counter (26) has a count of 36 an activating signal is supplied to the detonator connected to that module via a terminal (28).

396095

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