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Title: Ultrasonic unipolar pulse/echo instrument

Abstract

An ultrasonic unipolar pulse/echo instrument uses active switches and a timing and drive circuitry to control electrical energy to a transducer, the discharging of the transducer, and the opening of an electrical pathway to the receiving circuitry for the returning echoes. The active switches utilize MOSFET devices along with decoupling circuitry to insure the preservation of the unipolar nature of the pulses, insure fast transition times, and maintain broad band width and time resolution. A housing contains the various circuitry and switches and allows connection to a power supply and a movable ultrasonic transducer. The circuitry maintains low impedance input to the transducer during transmitting cycles, and high impedance between the transducer and the receiving circuit during receive cycles to maintain the unipolar pulse shape. A unipolar pulse is valuable for nondestructive evaluation, a prime use for the present instrument.

Inventors:
 [1];  [1];  [1];  [1]
  1. (Ames, IA)
Issue Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA
Sponsoring Org.:
USDOE
OSTI Identifier:
868724
Patent Number(s):
5199299
Assignee:
Iowa State University Research Foundation, Inc. (Ames, IA) AMES
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
ultrasonic; unipolar; pulse; echo; instrument; active; switches; timing; drive; circuitry; control; electrical; energy; transducer; discharging; pathway; receiving; returning; echoes; utilize; mosfet; devices; decoupling; insure; preservation; nature; pulses; fast; transition; times; maintain; broad; band; width; time; resolution; housing; contains; various; allows; connection; power; supply; movable; maintains; impedance; input; transmitting; cycles; circuit; receive; shape; valuable; nondestructive; evaluation; prime; time resolution; electrical pathway; nondestructive evaluation; pulse shape; ultrasonic transducer; electrical energy; power supply; drive circuit; broad band; band width; electrical path; unipolar pulse; housing contains; drive circuitry; ultrasonic unipolar; control electrical; echo instrument; /73/367/

Citation Formats

Hughes, Michael S., Hsu, David K., Thompson, Donald O., and Wormley, Samuel J. Ultrasonic unipolar pulse/echo instrument. United States: N. p., 1993. Web.
Hughes, Michael S., Hsu, David K., Thompson, Donald O., & Wormley, Samuel J. Ultrasonic unipolar pulse/echo instrument. United States.
Hughes, Michael S., Hsu, David K., Thompson, Donald O., and Wormley, Samuel J. Fri . "Ultrasonic unipolar pulse/echo instrument". United States. https://www.osti.gov/servlets/purl/868724.
@article{osti_868724,
title = {Ultrasonic unipolar pulse/echo instrument},
author = {Hughes, Michael S. and Hsu, David K. and Thompson, Donald O. and Wormley, Samuel J.},
abstractNote = {An ultrasonic unipolar pulse/echo instrument uses active switches and a timing and drive circuitry to control electrical energy to a transducer, the discharging of the transducer, and the opening of an electrical pathway to the receiving circuitry for the returning echoes. The active switches utilize MOSFET devices along with decoupling circuitry to insure the preservation of the unipolar nature of the pulses, insure fast transition times, and maintain broad band width and time resolution. A housing contains the various circuitry and switches and allows connection to a power supply and a movable ultrasonic transducer. The circuitry maintains low impedance input to the transducer during transmitting cycles, and high impedance between the transducer and the receiving circuit during receive cycles to maintain the unipolar pulse shape. A unipolar pulse is valuable for nondestructive evaluation, a prime use for the present instrument.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {1}
}

Patent:

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