UNIT OF SEISMIC TRANSMITTERS FOR SYSTEM OF ANTISEISMIC PROTECTION Russian patent published in 2003 - IPC

FIELD: measurement of seismic effect, formation of signals for protection systems, for instance, of atomic reactors. SUBSTANCE: unit of seismic transmitters for antiseismic protection of atomic reactor has three static-dynamic accelerometers of balancing conversion placed along orthogonal axes and signal forming circuit. Source of constant current for compensation of action of gravitational acceleration is connected to input of network of negative feedback of accelerometer which measurement axis is vertical. Isolating RC circuits which time constant is determined by lower frequency of edge of frequency range of measurement of seismic vibrations are placed between outputs of accelerometers and inputs of signal forming circuit. Generator of calibration signals of specified amplitude and frequency which value lies within frequency range of measurements is connected to inputs of negative feedback of accelerometers to secure periodic test of entire measurement path of unit. EFFECT: raised sensitivity with simultaneous increase in accuracy and provision for test of entire measurement path in process of operation without dismantling from object and disconnection from protection system. 1 dwg