Nondestructive inspection device and phase concerns and amplitude information operation device

摘要

PURPOSE: To achieve higher accuracy, a smaller size and a lower cost by computing information pertaining to phase relationship between an output signal of a detecting section and a drive signal based on an amplitude data and an instantaneous value data sampled. ;CONSTITUTION: A signal from a probe 50 is sent to a differential amplification circuit 34 to extract a difference signal between outputs of two coils as status signal of a subject. An output of the circuit 34 is sent to a bandpass filter 35 to separate the status signal of the subject in terms of frequency of a multiplex frequency signal. In amplitude computing circuits 37, an output signal is rectified with a rectifier circuit 41, integrated with an integration circuit 42 converted with a circuit 43 into digital from analog. A circuit 36 converts an input signal into digital from analog and every time a data latch timing signal is sent from a RAM 22, an A/D conversion data is latched. A DSP20 calculates a phase difference between an output of the filter 35 and a probe drive signal based on an amplitude data from an amplitude computing circuit 37 and an instantaneous value data from the circuit 36 to compute an X coordinate component and a Y coordinate component on an amplitude phase plane of the status signal of the subject. A controller 10 lets a display device 12 perform a two-dimensional display of the status signal of the subject.;COPYRIGHT: (C)1994,JPO&Japio