![Analysis of High Temperature Effects on Piezoelectric Based Ultrasonic Transducers için kapak resmi Analysis of High Temperature Effects on Piezoelectric Based Ultrasonic Transducers için kapak resmi](/client/assets/d79c3e4af2b6d196/ctx/images/no_image.png)
Analysis of High Temperature Effects on Piezoelectric Based Ultrasonic Transducers
Başlık:
Analysis of High Temperature Effects on Piezoelectric Based Ultrasonic Transducers
Yazar:
Bilgunde, Prathamesh N., author. (orcid)0000-0003-1052-5161
ISBN:
9780438072879
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (190 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
Advisors: Leonard J. Bond Committee members: Timothy Bigelow; Wei Hong; Ronald Roberts; Paul Schafbuch.
Özet:
Under sodium viewing (USV) using ultrasonic pulse-echo techniques offers the potential for the inspection of generation IV, liquid sodium-cooled fast reactors (SFRs) at the hot stand-by temperature (260C). However, the harsh environment effects on the transducer reduce the ultrasonic signal strength which also limits the probability of detection (POD) of the defects.
Current work presents a unified modeling and measurement-based methodology to analyze the high temperature effects on the transducer components. Resonance analysis-based characterization has shown that the conventional d 33 piezoelectric parameter is not a sufficient condition to estimate resonance characteristics of high temperature ultrasonic transducers. A full piezoelectric material matrix needs to be utilized in order to estimate high temperature performance. In seeking materials, BiScO3-PbTiO 3 (Bismuth Scandium oxide-lead titanate) is demonstrated to be the piezoelectric material that could potentially be used for hot stand-by mode (260C) inspection of SFRs.
However, a high temperature ultrasonic transducer is also a multi-layer system where the interaction of multiple acoustic layers is equally important as the temperature dependence of a single piezoelectric layer. A 3-layer problem was studied which demonstrated the thermal cycling effect on the interfaces, evident from the echo amplitudes and bandwidth of the frequency response up to 260 °C. A unique bi-modal resonance phenomenon was also found in the transducer due to interaction of the multiple acoustic layers.
Utilizing these insights, design, development and high temperature evaluation of several prototypes was performed in surrogate fluids. This resulted in an air-backed transducer using BS-PT piezoelectric material, nickel faceplate, and liquid acoustic coupling with silicone oil. The transducer demonstrated the ability for imaging regions of different thickness within the specimen, critical for USV capabilities in SFRs.
Current work also developed a cost effective, novel temperature compensated transfer function approach to predict POD at high temperature using room temperature experimental data. Such a model-assisted POD approach quantified effect of temperature dependence of PZT-5A material on POD near 200 °C. This approach could be extended for other high temperature transducer materials using a physics based-model and room temperature experimental data to estimate high temperature POD.
Notlar:
School code: 0097
Tüzel Kişi Ek Girişi:
Mevcut:*
Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(679997.1) | 679997-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
On Order
Liste seç
Bunu varsayılan liste yap.
Öğeler başarıyla eklendi
Öğeler eklenirken hata oldu. Lütfen tekrar deneyiniz.
:
Select An Item
Data usage warning: You will receive one text message for each title you selected.
Standard text messaging rates apply.