Patent
Ultrasonic testing of materials
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TLDR
An ultrasonic apparatus for testing a material comprises an oscillator (10) which generates a selected frequency in the ultrasonic range, and a transducer (1) is connected to the oscillator for applying an ultrasonic signal to the material and for receiving an echo signal back from the material.Abstract:
An ultrasonic apparatus for testing a material comprises an oscillator (10) which generates a selected frequency in the ultrasonic range. A transducer (1) is connected to the oscillator (10) for applying an ultrasonic signal to the material and for receiving an echo signal back from the material. A phase detector (5) receives the echo signal and an in-phase oscillator signal to generate a first display signal, and a phase detector (6) receives a quadrature signal (90° out of phase from the oscillator signal) and the echo signal to generate a second display signal. The first and second display signals are utilised in a visual display, such as a cathode ray tube (8), to generate an image. The image changes according to the phase shift between the ultrasonic signal transmitted into the material and the echo signal, which, in turn, can be utilised to determine the presence and depth of a flaw or boundary in the material.read more
Citations
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Book
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References
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Method and apparatus for delay analysis of energy transmitted through a medium
TL;DR: In this article, a method and apparatus for determining the manner by which an initial injection of wave energy is modified by a medium under test using a time delay spectrometer (TDS) and a fast Fourier transform (FFT).
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Multi-frequency ultrasonic search unit
TL;DR: In this paper, a multi-frequency ultrasonic nondestructive testing system and a multifrequency search unit for use in such a system are described, which includes a plurality of piezoelectric transducers for transmitting and receiving ultrasonic energy at a corresponding number of different frequencies.
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Method and means for ultrasonic inspection
TL;DR: In this article, the ultrasonic inspection of a structure such as steel tubing is enhanced by moving ultrasonic wave transmitter and receiver through the pipe and periodically injecting an ultrasonic pulse into the tube.
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Measuring characteristics of an ultrasonic wave medium
John R. Klepper,John M. Reid,Hirohide C,O Fujitsu Ltd. Pat. Dept. Miwa,Takaki C,O Fujitsu Ltd. Pat. Dept. Shimura,Keiichi C,O Fujitsu Ltd. Pat. Dept. Murakami +7 more
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F.K. Lam,W.M. Tsang +1 more
TL;DR: In this article, a method of flaw characterization based on time domain analysis of the diffracted sound field from a flaw when irradiated by short ultrasonic pulses is described, and the echo formation mechanism developed by Freedman has been utilized to predict the return pulse pattern.