Acoustic polarimeter

Details Acoustic polarimeter Acoustic polarimeter

1981-01-26

1983-01-11

Kazenske, Edward R.

Measuring and testing

Vibration

By mechanical waves

73589, 73644, G01N 2900

Patent

active

043676499

ABSTRACT:
An acoustic polarimeter for measuring the anisotropy of a sample comprises an electroacoustic transducer which transmits a high-frequency transverse acoustic wave and is fixed on a birefringent measuring plate. The acoustic wave is received by a second transducer and this latter is sensitive to the component of the wave which is parallel to the transmitted wave. Transmission devices are provided for delivering electrical signals which are frequency-modulated about a tunable mean frequency. The electrical signals applied to the second transducer are received on a zero indicator, thus permitting determination of the directions of the slow axis and fast axis of the sample as well as the angle of phase shift introduced by the sample.

REFERENCES:
patent: 4138894 (1979-02-01), Robert et al.
Optical Heterodyne Method for Measuring Mechanical Oscillation, by Pushert, Feinwerktechnik & Messtechnik 83 (1975), No. 7, pp. 316/317.

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