DEVICE MEASURING PHYSICAL QUANTITIES Russian patent published in 2001 - IPC

FIELD: radio electronic measurement technology. SUBSTANCE: invention is designed for use in multichannel measurements conducted in security systems of protected facilities. Resonance inductive-capacitive transducers tuned to needed resonance frequency are excited in proposed device, phases of exciting and output signals are compared and moments of occurrence of resonance frequency are exposed by change of sign of phase difference. Addition of microprocessor into device makes it feasible to combine measurement process with functional conversion of signals. EFFECT: increased measurement accuracy thanks to exclusion of commutation of analog networks, to power supply of transducers with pulses of current and to isolation of bandwidth of transducers by phase method.