Measuring and testing – Vibration – By mechanical waves
Patent
1983-04-05
1985-02-26
Ciarlante, Anthony V.
Measuring and testing
Vibration
By mechanical waves
73645, G01N 2900
Patent
active
045011508
ABSTRACT:
An acoustic polarimeter is provided for measuring the acoustic birefringence of a plate with parallel faces.
The plate to be measured is fixed to one face of an acoustically isotropic body and to the other face are fixed transducers having their linear transfer axis at 90.degree. from each other transmitting waves at pulsation .omega. modulated respectively by cos .OMEGA.t and sin .OMEGA.t. After reflection from the rear face of the sample, the signals X.sub.1 and Y.sub.1 received by the transducers are processed in processing circuits. The signals x.sub.1 and y.sub.1 are multiplied by a signal cos (.omega.t+.phi.) supplied by a phase-shifter controlled by a signal S.sub.1. After filtering, signals X and Y are obtained which are used for generating two signals A and B. A microprocessor receiving the amplitudes of these signals A and B controls the phase-shifter and supplies the birefringence angle .phi.. The direction of the first axis is obtained by synchronous detection of signal A.sub.1 by sin 2 .OMEGA.t.
REFERENCES:
patent: 3587297 (1968-09-01), Kammer
patent: 4138894 (1979-02-01), Robert et al.
"Thomson-CSF"
Ciarlante Anthony V.
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