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Real-Time Acousto-Optic Visualization of Ultrasonic Pulses in TeO_2

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Polishko O., Yurchenko A., Pilgun Y., Smirnov E.

Acta Physica Polonica A

2015

vol. 127

issue 1

132-134

The ultrasonic beam features in ultrasonic and acousto-optic devices have a great impact on their characteristics and need to be studied. In the current work, a conventional optical visualization technique was extended to include spatial filtration of the light diffraction pattern and stroboscopic illumination of a unit under test. That enabled very weak light responses from ultrasonic waves to be observed. This technique was applied to studying propagation and reflection of ultrasonic pulses in the TeO_2 crystal, a body of the total internal reflection ultrasonic sensor. Analysis of visualization data has revealed an unexpected conversion of the shear horizontal wave radiated by the transducer into a longitudinal one on its normal reflection from the (001) face of the crystal, which is inexplicable as far as the plane wave theory is concerned. This finding requires further research to be confirmed and explained.

Structure of Acoustic Field in Infrared Tellurium Based X-Y Deflector

61%

Trushin A., Voloshinov V.

Theoretical investigation of acoustic field in a tellurium two-coordinate deflector was carried out. We used angular spectrum method supported by consideration to boundary conditions in approximation of a given displacement to calculate spatial distribution of the acoustic field intensity. Volumetric illustration is presented for the acoustic beam launched from YZ face of the crystal. Cross-sections of the acoustic field generated from XZ face are also presented in the work. It is shown that the strong anisotropy of acoustic properties in the Te crystal leads to principally different structure of the two fields excited from the XZ and YZ crystal faces. The acoustic field excited from the XZ face may be considered as a simple beam with a relatively high divergence. On the other hand, the field generated from the YZ face looks like superposition of two beams with relatively low divergence. Ratio of intensities of the two beams generated by longitudinal piezotransducers is equal to the ratio predicted by analysis based by plane-wave theory.

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2 Acta Physica Polonica A

2 2015

1 Pilgun Y.

1 Polishko O.

1 Smirnov E.

1 Trushin A.

1 Voloshinov V.

1 Yurchenko A.

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Real-Time Acousto-Optic Visualization of Ultrasonic Pulses in TeO_2

Structure of Acoustic Field in Infrared Tellurium Based X-Y Deflector