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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:
; ; ;
Issue Date:
OSTI Identifier:
6150235
Patent Number(s):
5199299
Application Number:
PPN: US 7-667437
Assignee:
Iowa State Univ. Research Foundation, Inc., Ames, IA (United States)
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Patent
Resource Relation:
Patent File Date: 11 Mar 1991
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; PULSE CIRCUITS; CONTROL; TRANSDUCERS; DESIGN; ACOUSTIC MEASUREMENTS; CONTROL SYSTEMS; PULSE ANALYZERS; PULSE GENERATORS; ULTRASONIC TESTING; ACOUSTIC TESTING; ELECTRONIC CIRCUITS; ELECTRONIC EQUIPMENT; EQUIPMENT; FUNCTION GENERATORS; MATERIALS TESTING; NONDESTRUCTIVE TESTING; TESTING; 420500* - Engineering- Materials Testing

Citation Formats

Hughes, M J, Hsu, D K, Thompson, D O, and Wormley, S J. Ultrasonic unipolar pulse/echo instrument. United States: N. p., 1993. Web.
Hughes, M J, Hsu, D K, Thompson, D O, & Wormley, S J. Ultrasonic unipolar pulse/echo instrument. United States.
Hughes, M J, Hsu, D K, Thompson, D O, and Wormley, S J. Tue . "Ultrasonic unipolar pulse/echo instrument". United States.
@article{osti_6150235,
title = {Ultrasonic unipolar pulse/echo instrument},
author = {Hughes, M J and Hsu, D K and Thompson, D O and Wormley, S 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 = {4}
}