초록 ▼

Monitoring explosive devices is accomplished with a substantially z-cut lithium niobate crystal in abutment with the explosive device. Upon impact by a shock wave from detonation of the explosive device, the crystal emits a current pulse prior to destruction of the crystal. The current pulse is dete

Monitoring explosive devices is accomplished with a substantially z-cut lithium niobate crystal in abutment with the explosive device. Upon impact by a shock wave from detonation of the explosive device, the crystal emits a current pulse prior to destruction of the crystal. The current pulse is detected by a current viewing transformer and recorded as a function of time in nanoseconds. In order to self-check the crystal, the crystal has a chromium film resistor deposited thereon which may be heated by a current pulse prior to detonation. This generates a charge which is detected by a charge amplifier.

대표청구항 ▼

An explosive monitor including: means for providing an electrical output indicative of the detonation of an explosive material, said means comprising: a lithium niobate crystal wafer having spaced parallel faces cut substantially perpendicular to a unique polar axis “z”; and first means for detectin

An explosive monitor including: means for providing an electrical output indicative of the detonation of an explosive material, said means comprising: a lithium niobate crystal wafer having spaced parallel faces cut substantially perpendicular to a unique polar axis “z”; and first means for detecting a piezoelectric current output of said crystal indicative of the detonation of an explosive material; and checking means for nondestructively checking the responsiveness of said crystal prior to detonation of the explosive material, said checking means comprising: second means for controllably heating said crystal; and third means for detecting a pyroelectric charge output of said crystal responsive to the heating of said crystal by said second means.