PROCESS INDICATING DESTRUCTION OF PLATES AND SHELLS FROM DIELECTRIC MATERIALS Russian patent published in 1997 - IPC

FIELD: burglar alarm in living and service rooms, in automobiles and other objects having structural members made of dielectric materials which destruction can result in unauthorized access into guarded object. SUBSTANCE: proposed process can find use where indication of destruction of vessels manufactured from dielectric materials, for instance, in laboratories in chemical industry, etc. is necessary. Objective of this invention is development of reliable and authentic process indicating destruction specifically of plates and shells from dielectric materials and possibility of its usage in equipment of burglar alarm systems. Process indicating destruction of plates and shells of dielectric materials is based on registration of electromagnetic radiation generated by material in range of radio waves followed by indication of fact of destruction. Registration of electromagnetic radiation is carried out on frequencies of thickness resonance of plates and shells on ultrasound shift and longitudinal vibrations emerging with destruction. Proposed process totally meets all requirements imposed on burglar alarms. EFFECT: usage of process provides for maximum probability of detection, minimal average frequency of false alarms, minimal vulnerability of employed devices.