Sensitive force transducers using a single amorphous core multivibrator bridge

New sensitive linear-type force transducers are presented using a single amorphous core multivibrator bridge with a dc output. These amorphous-core transducers, in which annealed Metglas 2605A ribbon-wound cores with lumped windings are used, have high linearity (0.5 %FS), high stability against temperature variation (0.02 %FS/°C), high maximum operating temperature (200°C), and high output voltage (350 mV) compared with conventional unbonded resistance wire strain gages and semiconductor transducers. The amorphous-core force transducers are considered to be suitable for application in industrial automatic control under high temperature and high noise level conditions.