Flexible ultrasonic transducer arrays for health monitoring of an aircraft component

Liu, W. L.; Jen, C. K.; Wu, Kuo-Ting; Kobayashi, Makiko; Mrad, Nezih

doi:10.1784/insi.2011.53.6.316

Cited by 1 publication

(3 citation statements)

References 13 publications

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“…, 4 mm pitch) on 75 μm thick Ti foil. The fabrication of the FUT array consists of six main steps [7,9]: (1) preparation of a high dielectric constant lead-zirconate-titanate (PZT) solution [8], (2) ball milling of the piezoelectric PZT powders in a PZT solution to submicron sizes, (3) sensor spraying using slurries to produce a film with thickness of 5 to 20 μm, (4) heat treatment to produce a solid PZT composite (PZT-c) thick film, (5) Corona poling to obtain piezoelectricity, and (6) colloidal silver spraying with a mask to deposit the top electrodes and electrically conducting lines. Steps (3,4) are performed multiple times to produce an optimal PZT-c film thickness for the specified ultrasonic operating frequency (center frequency).…”

Section: Fabrication Of Piezoelectric 1d Fut Arraymentioning

confidence: 99%

“…It is noted that the signal strength of the FUTs made on Ti foil is normally a few dB better than that achieved from FUTs made on SS foil because of a decrease in substrate oxidation during heat treatment. However, FUTs using SS foils may be brazed onto steel substrates such as pipes for SHM purposes at HT [9]. Finally another insulation layer acting as a protection layer to prevent moisture, which may also sustain temperatures of up to 150 °C was coated, but not shown in Figure 1.…”

Section: Fabrication Of Piezoelectric 1d Fut Arraymentioning

confidence: 99%

“…In this study, the feasibility of using one dimensional (1D) flexible ultrasonic transducer (FUT) arrays, made by a technology of PZT sol-gel [6–8] sprayed piezoelectric thick film on Ti foil [9,10], for defect detection at 150 °C is demonstrated. First, the ultrasonic thickness measurement of a straight steel pipe using the home-made FUT array attached on the outer surface of pipe is performed at 150 °C for the application of corrosion detection, where the pulse-echo signals are used.…”

Section: Introductionmentioning

confidence: 99%

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Applications of Flexible Ultrasonic Transducer Array for Defect Detection at 150 °C

Shih

Jen

et al. 2013

Sensors

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In this study, the feasibility of using a one dimensional 16-element flexible ultrasonic transducer (FUT) array for nondestructive testing at 150 °C is demonstrated. The FUT arrays were made by a sol-gel sprayed piezoelectric film technology; a PZT composite film was sprayed on a titanium foil of 75 μm thickness. Since the FUT array is flexible, it was attached to a steel pipe with an outer diameter of 89 mm and a wall thickness of 6.5 mm at 150 °C. Using the ultrasonic pulse-echo mode, pipe thickness measurements could be performed. Moreover, using the ultrasonic pulse-echo and pitch-catch modes of each element of FUT array, the defect detection was performed on an Al alloy block of 30 mm thickness with a side-drilled hole (SDH) of ϕ3 mm at 150 °C. In addition, a post-processing algorithm based on the total focusing method was used to process the full matrix of these A-scan signals of each single transmitter and multi-receivers, and then the phase-array image was obtained to indicate this defect- SDH. Both results show the capability of FUT array being operated at 150 °C for the corrosion and defect detections.

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Section: Fabrication Of Piezoelectric 1d Fut Arraymentioning

confidence: 99%

Section: Fabrication Of Piezoelectric 1d Fut Arraymentioning

confidence: 99%