Sensor signal processing apparatus

摘要

A sensor signal processing apparatus includes a sensor section, power supply section, switching section, and CPU. The characteristics of the sensor section change in accordance with a change in physical quantity to be measured. The power supply section supplies power of two systems having different polarities to the sensor section. The switching section is connected between the power supply section and the sensor section to switch combinations of the power of the two systems from the power supply section while preventing mixing of the power of the two systems. The CPU obtains the ratio between the differences between a plurality of signals output from the sensor section for every switching operation of the switching section.