Amplitude detecting device

Details Amplitude detecting device Amplitude detecting device

1997-06-24

1999-07-13

Williams, Hezron

Measuring and testing

Vibration

Sensing apparatus

341115, G01H 1300

Patent

active

059229640

ABSTRACT:
The phase controlling circuit 1 controls the phase of the input sinusoidal signal S1 to generate first and second sinusoidal signal S1 and S2 which have different phases of 90.degree. shifted from each other. The signal generating circuits 2a and 2b square the first and second sinusoidal signal S1 and S2 to generate first and second squared sinusoidal signals S1.sup.2 and S2.sup.2, respectively. The squared sinusoidal signals S1.sup.2 and S2.sup.2 are added by the signal adding circuit 3, thereby generating the added output S3 which is an amplitude of the input sinusoidal signal S. The phase controlling circuit 1 comprises 90.degree. phase shift circuits 11 and 12 which have a common signal input terminal and the respective signal output terminals. The 90.degree. phase shift circuit is composed of an all-pass filter whose central frequency is set to be f0-.DELTA. f so as to generate the first sinusoidal signal. The second 90.degree. phase shift circuit is composed of an all-pass filter whose central frequency is set to be f0+.DELTA. f so as to generate the second sinusoidal signal.

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Patent Abstract of Japan vol. 017, No. 261 (E-1369), May 21, 1993 & JP 05 003418 A (Mitsubishi Electric CORP.) Jan. 8, 1993.
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