Patent ID: 8138746
Filing Date: 2012-03-20
Classification: G11B

Abstract:
1. A physical properties detection device comprising: a probe to be placed near or touching a surface of a ferroelectric; an oscillation loop including said probe and an capacitance within said ferroelectric; and a detection part for detecting a physical properties of said ferroelectric on the basis of a frequency variation of a measurement signal generated in said oscillation loop, the frequency variation accompanying application of an alternating electric field to said ferroelectric; said physical properties detection device further comprising: a frequency conversion part for converting the frequency of said measurement signal to a low frequency and outputting the resulting signal as a converted measurement signal; a frequency control part for controlling the frequency of said converted measurement signal so as to match a target frequency; a frequency detection part for generating a frequency detection signal that has a signal level corresponding to the frequency of said converted measurement signal; and a synchronous detection part for synchronously detecting said frequency detection signal on the basis of a synchronization signal.