• Ceramist
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• v.8 no.4
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• pp.40-44
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• 2005

• Ceramist
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• v.8 no.4
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• pp.45-53
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• 2005

• Ceramist
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• v.20 no.3
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• pp.60-71
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• 2017

• Ceramist
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• v.4 no.5
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• pp.16-28
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• 2001

• Ceramist
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• v.4 no.5
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• pp.29-34
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• 2001

• Ceramist
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• v.4 no.5
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• pp.44-51
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• 2001

• Ceramist
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• v.4 no.5
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• pp.63-66
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• 2001

• Ceramist
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• v.4 no.5
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• pp.5-15
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• 2001

• Journal of the Korean Society for Nondestructive Testing
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• v.23 no.5
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• pp.445-454
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• 2003

Health monitoring is a major concern not only in the design and manufacturing but also in service stages for composite laminated structures. Excessive loads or low velocity impact can cause matrix cracks and delaminations that may severely degrade the load carrying capability of the composite laminated structures. To develop the health monitoring techniques providing on-line diagnostics of smart composite structures can be helpful in keeping the composite structures sound during their service. In this study, we discuss the signal processing techniques and some applications for health monitoring of composite structures using piezoceramic sensors and fiber optic sensors.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.7
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• pp.3191-3196
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• 2013

Ultrasonic transducer is the sensor which is measuring distance. Piezo ceramic of ultrasonic sensor and adhesive technique of matching layer are the most core techniques. With the study of relation on matching layer which takes off the ultrasonic wave into the air, this paper aims to find the second useful frequency as the results which can be changed are extracted in case piezo ceramic and matching layer are bonded. And the experiment is done with piezo ceramic as real piezoelectric element and matching layer of chemical wood. OD of piezo ceramic has designed by ${\Phi}50{\times}3T$ and OD of matching layer is designed by ${\Phi}62{\times}12t$ with ${\lambda}=1/4$. Acoustic impedance is generated at the most optimum resonant frequency of 53 Khz. As experimental result, more available frequency can be generated by using the adhesive close to solid than the flexible one.