2014
DOI: 10.1587/elex.11.20140510
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Optical observation method for ultrasonic field using the shadowgraph introducing pulse inversion averaging

Abstract: Abstract:The pulse inversion averaging (PIA) method is introduced to the shadowgraph imaging system to visualize the second-harmonic component of the ultrasonic field. The principle of the PIA method is summarized and the method is customized for observing an second-harmonic ultrasonic field. An experiment of a shadowgraph with PIA using a 1-MHz concave focused transducer is conducted to evaluate the system. The fundamental component of 1 MHz is suppressed more than 30 dB with respect to the second-harmonic co… Show more

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Cited by 3 publications
(2 citation statements)
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“…Thereby, the time transition of ultrasonic waves propagation can be observed by varying the delay time ÁT of the delay unit. In the imaging process, the differential method [19][20][21], in which the sound-off image is subtracted from the sound-on image was used to enhance the contrast of the image. Figures 3(a)-3(d) show ultrasonic waves propagation images of 30-cycle S0-mode burst sine Lamb waves for delay times, ÁT, of 14 ms, 18 ms, 26 ms and 38 ms, respectively.…”
Section: Experimental Visualization Methods and Resultsmentioning
confidence: 99%
“…Thereby, the time transition of ultrasonic waves propagation can be observed by varying the delay time ÁT of the delay unit. In the imaging process, the differential method [19][20][21], in which the sound-off image is subtracted from the sound-on image was used to enhance the contrast of the image. Figures 3(a)-3(d) show ultrasonic waves propagation images of 30-cycle S0-mode burst sine Lamb waves for delay times, ÁT, of 14 ms, 18 ms, 26 ms and 38 ms, respectively.…”
Section: Experimental Visualization Methods and Resultsmentioning
confidence: 99%
“…Fig. 4 shows Schlieren photograph of the underwater sound field [21,27] when the transducer was driven with 1 MHz, burst sine waves of 80 cycles of 100 Vp-p to evaluate the sound field in water. The photographs show that the 1 MHz ultrasonic wave radiated upward from the lower transducer.…”
Section: Transducer With Sidingmentioning
confidence: 99%