PHYSICAL AMOUNT DETECTION DEVICE

摘要

Provided is a highly sensitive sensor system which can improve an S/N ratio by an electronic circuit without complicating a sensor body or degrading a temporal resolution. A sensor element is electrically driven and outputs an electric amount corresponding to a received physical amount. The sensor is driven by a wide band by using a band spread signal formed by multiplying a carrier signal by an m-sequence code. The band spread signal which has been subjected to a phase adjustment is used to demodulate the sensor output signal corresponding to a physical amount spread in a wide band. Thus, it is possible to restore the physical amount into the original bandwidth. The electric noise generated by the sensor spreads into a wide range and is suppressed by low band filtration so as to improve the S/N ratio.