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The design, fabrication and characte...

Singh, Rahul.

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The design, fabrication and characterization of an ultrasonic crack detection system for human teeth.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The design, fabrication and characterization of an ultrasonic crack detection system for human teeth./
作者:	Singh, Rahul.
面頁冊數:	220 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1638.
Contained By:	Dissertation Abstracts International66-03B.
標題:	Engineering, Electronics and Electrical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3169188
ISBN:	054205342X

The design, fabrication and characterization of an ultrasonic crack detection system for human teeth.
Singh, Rahul.

The design, fabrication and characterization of an ultrasonic crack detection system for human teeth. - 220 p.

Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1638.

Thesis (Ph.D.)--University of California, Los Angeles, 2005.

This dissertation entails the design, fabrication, and characterization of a novel ultrasonic imaging system for human teeth. The system development required research in three separate technical areas: (1) a novel thickness-mode piezoelectric transducer, (2) analog transceiver electronics, and (3) digital signal processing (DSP) tailored for crack detection.

ISBN: 054205342XSubjects--Topical Terms:

626636
Engineering, Electronics and Electrical.

The design, fabrication and characterization of an ultrasonic crack detection system for human teeth.
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245 1 4 $a The design, fabrication and characterization of an ultrasonic crack detection system for human teeth.
300 $a 220 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1638.
500 $a Co-Chairs: Eilliot R. Brown; Warren S. Grundfest.
502 $a Thesis (Ph.D.)--University of California, Los Angeles, 2005.
520 $a This dissertation entails the design, fabrication, and characterization of a novel ultrasonic imaging system for human teeth. The system development required research in three separate technical areas: (1) a novel thickness-mode piezoelectric transducer, (2) analog transceiver electronics, and (3) digital signal processing (DSP) tailored for crack detection.
520 $a The research started with design and simulation of an innovative thickness-mode piezoelectric transducer tailored for human teeth. The goal of the transducer design was to optimize its performance with respect to electro-acoustic power generation efficiency, short acoustic pulse generation, and efficient acoustic energy coupling into the hard tissues of the human tooth. The final transducer is based on a single, novel piezoelectric (PLZT-98(TM)) capacitor for the active element, and operates resonantly at a center frequency of 20 MHz with an instantaneous bandwidth of 30%.
520 $a The second segment of the research concentrated on the design and implementation of the analog transceiver electronics of the system. The primary design issue was to maintain a high signal-to-noise ratio (SNR) in monostatic operation. The transmit pulse, a gated-cw waveform, provides an efficient use of energy in conjunction with the piezoelectric transducer. The receiver front-end design is based on traditional, analog superheterodyne techniques to extract the down-converted baseband (envelopes) of the return pulses.
520 $a The third part of the research, DSP algorithms were developed for processing the digitized output from the superheterodyne receiver. The envelopes are cross-correlated against a pulse echo signature from a control crack to maximize the SNR and probability-of-detection specifically for cracks. The DSP algorithms in conjuction with the analog superheterodyne receiver combine to form a matched filter processor.
520 $a Finally, two key results are presented to exemplify the overall system performance, a proof-of-concept for dental crack detection using a simulated tooth with a synthetic 25-um crack and improved dento-enamel junction (DEJ) imaging in an extracted human tooth. The results show unequivocally the detection of the crack and a great improvement in DEJ detection. In summary, this dissertation reports a significant step forward the imaging of human teeth using ultrasound and provides a design basis for a future ultrasonic dental imaging system.
590 $a School code: 0031.
650 4 $a Engineering, Electronics and Electrical. $3 626636
650 4 $a Health Sciences, Dentistry. $3 1019378
650 4 $a Engineering, Biomedical. $3 1017684
650 4 $a Health Sciences, Radiology. $3 1019076
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710 2 0 $a University of California, Los Angeles. $3 626622
773 0 $t Dissertation Abstracts International $g 66-03B.
790 1 0 $a Brown, Eilliot R., $e advisor
790 1 0 $a Grundfest, Warren S., $e advisor
790 $a 0031
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3169188