F - Mech Eng,Light,Heat,Weapons – 42 – D
Patent
F - Mech Eng,Light,Heat,Weapons
42
D
342/47, 328/92
F42D 1/055 (2006.01)
Patent
CA 2010376
34 METHOD AND APPARATUS FOR THE CALIBRATION OF ELECTRONIC TIMING CIRCUIT ABSTRACT A timing circuit includes a variable frequency oscillator which has a control signal that determines the output frequency of the oscillator. The control signal is stored in the circuit. A reference signal is further stored in the circuit. A precision calibration pulse is applied to the timing circuit which counts the output cycles of the variable frequency oscillator during the period of the pulse. This count is stored and compared to the reference count to produce an error count. This error count is combined with the previously stored control signal to produce a new control signal that drives the output of the oscillator to a new frequency which is closer to a predetermined timing relation with the time reference which produced the calibration pulse. Additional calibration pulses are sequentially applied to the timing circuit to cause the frequency of the oscillator to converge toward a predetermined relation with the time reference. The timing circuit can be utilized as a part of a delay circuit in an electronic blasting system wherein a control unit transmits the calibration pulse concurrently to each of the delay circuits to cause each circuit to calibrate its local oscillator in accordance with the calibration pulse. One or more of such pulses can be transmitted to cause all of the delay circuit oscillators to be brought to within a required degree of synchronization of rates. The control unit transmits a delay count to each of the delay ignition circuits. A fire command is transmitted from the control unit to each of the delay ignition circuits to cause the outputs of the calibrated local oscillators to be compared to the previously received delay count until a predetermined relation is reached. When this relation is reached, each delay ignition circuit generates a fire signal which ignites a corresponding explosive element.
Goffin Glen Peter II
Ici Explosives Usa Inc.
Marks & Clerk
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