Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1986-05-29
1990-01-09
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
73 35, 73167, 73DIG4, 310311, 310318, 310319, 310360, H01L 4108
Patent
active
048930490
ABSTRACT:
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.
REFERENCES:
patent: 3591813 (1971-07-01), Coquin et al.
patent: 3714476 (1973-01-01), Epstein
patent: 3727084 (1973-04-01), Epstein
patent: 3735161 (1973-05-01), Perkins et al.
patent: 3756070 (1973-09-01), McElroy
patent: 3858065 (1974-12-01), Epstein
Bundy Charles H.
Graham Robert A.
Kuehn Stephen F.
Precit Richard R.
Rogers Michael S.
Budd Mark O.
Hightower Judson R.
Libman George H.
Sopp Albert
The United States of America as represented by the United States
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