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Design of a dual chamber heat conduction calorimeter for ultrasonic beam measurement.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Design of a dual chamber heat conduction calorimeter for ultrasonic beam measurement./
Author:	Ong, Hang See.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1997,
Description:	152 p.
Notes:	Source: Dissertations Abstracts International, Volume: 59-04, Section: B.
Contained By:	Dissertations Abstracts International59-04B.
Subject:	Acoustics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9738467
ISBN:	9780591486667

Design of a dual chamber heat conduction calorimeter for ultrasonic beam measurement.
Ong, Hang See.

Design of a dual chamber heat conduction calorimeter for ultrasonic beam measurement. - Ann Arbor : ProQuest Dissertations & Theses, 1997 - 152 p.

Source: Dissertations Abstracts International, Volume: 59-04, Section: B.

Thesis (Ph.D.)--University of Minnesota, 1997.

This item must not be sold to any third party vendors.

The recent emergence of medical ultrasound dosimetry in terms of Thermal and Mechanical Indices gives rise to the need for a device that is capable of measuring ultrasonic output power quickly and accurately. In the research project described in this dissertation, a dual chamber heat conduction calorimeter (HCC) is designed, built, and tested for the purpose of measuring ultrasonic output power of clinical diagnostic ultrasound devices. The HCC is composed of two identical water filled Aluminum wells housed in two separated compartments of an insulated box. The two compartments form the measuring and reference chambers of the calorimeter. The wells are sealed with plastic membranes that constitute the entrance window for the ultrasound. The bottom of each well is stuffed with a 4cm layer of 0.5cm thick rubber pads. These pads serve as a sonic-to-heat energy exchanger. A small resistive heater is embedded in both rubber pads for calibration purposes. Heat is measured with a series of Seebeck effect thermoelectric devices (thermopiles) sandwiched between the well and the heat sink surrounding the wells. The output voltage signal from the thermopiles is amplified, digitized, then analyzed and displayed in term of Thermal Index with a PC-based system. An optimum measurement technique is derived from an electric circuit model that is representative of the HCC. The performance and sensitivity of the HCC is tested and measured, initially with the embedded resistive heaters, then with an experimental transducer, and lastly with transducers from clinical ultrasound scanners.

ISBN: 9780591486667Subjects--Topical Terms:

879105
Acoustics.
Subjects--Index Terms:

ultrasound dosimetry

Design of a dual chamber heat conduction calorimeter for ultrasonic beam measurement.
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008 241004s1997 ||||||||||||||||| ||eng d
020 $a 9780591486667
035 $a (MiAaPQ)AAI9738467
035 $a AAI9738467
040 $a MiAaPQ $c MiAaPQ
100 1 $a Ong, Hang See. $3 3687144
245 1 0 $a Design of a dual chamber heat conduction calorimeter for ultrasonic beam measurement.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1997
300 $a 152 p.
500 $a Source: Dissertations Abstracts International, Volume: 59-04, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Ritenour, E. Russell.
502 $a Thesis (Ph.D.)--University of Minnesota, 1997.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a The recent emergence of medical ultrasound dosimetry in terms of Thermal and Mechanical Indices gives rise to the need for a device that is capable of measuring ultrasonic output power quickly and accurately. In the research project described in this dissertation, a dual chamber heat conduction calorimeter (HCC) is designed, built, and tested for the purpose of measuring ultrasonic output power of clinical diagnostic ultrasound devices. The HCC is composed of two identical water filled Aluminum wells housed in two separated compartments of an insulated box. The two compartments form the measuring and reference chambers of the calorimeter. The wells are sealed with plastic membranes that constitute the entrance window for the ultrasound. The bottom of each well is stuffed with a 4cm layer of 0.5cm thick rubber pads. These pads serve as a sonic-to-heat energy exchanger. A small resistive heater is embedded in both rubber pads for calibration purposes. Heat is measured with a series of Seebeck effect thermoelectric devices (thermopiles) sandwiched between the well and the heat sink surrounding the wells. The output voltage signal from the thermopiles is amplified, digitized, then analyzed and displayed in term of Thermal Index with a PC-based system. An optimum measurement technique is derived from an electric circuit model that is representative of the HCC. The performance and sensitivity of the HCC is tested and measured, initially with the embedded resistive heaters, then with an experimental transducer, and lastly with transducers from clinical ultrasound scanners.
590 $a School code: 0130.
650 4 $a Acoustics. $3 879105
650 4 $a Electrical engineering. $3 649834
650 4 $a Mechanical engineering. $3 649730
653 $a ultrasound dosimetry
690 $a 0986
690 $a 0544
690 $a 0548
710 2 $a University of Minnesota. $3 676231
773 0 $t Dissertations Abstracts International $g 59-04B.
790 $a 0130
791 $a Ph.D.
792 $a 1997
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9738467