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2017.01.16 10:57

Comparison of Ultrasonic Nonlinear Parameters Measured by PZT and LiNbO3 Transducers

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Comparison of Ultrasonic Nonlinear Parameters Measured by PZT and LiNbO3 Transducers

http://aip.scitation.org/doi/abs/10.1063/1.4940514

Comparison of ultrasonic nonlinear parameters measured by PZT and LiNbO3 transducers

Jongbeom Kim1b), , Kyoung-Jun Lee1c), , and Kyung-Young Jhang2a),

View Affiliations

Ultrasonic transducers Ultrasonic testing Ultrasonic effects Piezoelectric transducers Heat treatments

ABSTRACT

The

ultrasonic

nonlinear techniques have been known as effective methods to evaluate a microstructure change of

material.

The

ultrasonic

nonlinear characteristic can be evaluated by the second-order

ultrasonic

nonlinear parameter β determined from the amplitudes of fundamental and second harmonic frequency components. The

ultrasonic

nonlinear parameter is generally measured by using a contact

transducer;

PZT

and LiNbO3

transducers

are commonly used. However, the measurement result may be dependent on the equipment. Here in, we are curious about whether the nonlinear parameters measured by different

transducers

are identical. Therefore, in this study, we compare the

ultrasonic

nonlinear parameters measured by different

transducers,

PZT

and LiNbO3. For the experiment, the Al6061 specimens heat

treated

at 220°C with different aging time 60, 600, and 6000 min were prepared, and then the

ultrasonic

nonlinear parameter was measured by using two different kinds of

transducer,

PZT

and LiNbO3. The results showed that the tendency of measured nonlinear parameter was similar regardless of the type of

transducer.

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Comparison of Ultrasonic Nonlinear Parameters Measured by PZT and LiNbO3 Transducers

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