Narrowband generation of ultrafast acoustic and thermal transients in thin films for enhanced detectability

Matsuda, Youichi; Richardson, C. J. K.; Spicer, James B.

doi:10.1109/tuffc.2002.1020161

Cited by 6 publications

(4 citation statements)

References 23 publications

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“…At constant total excitation power the detected magnitudes of the interfering SAWs are independent of the applied number of excitation lines. Therefore, by increasing 1 The pixel pitch of the SLM is 8 µm, with 512 × 512 pixels dimensions of the tiled hologram. The focal length of the objective lens was 16 mm and the used excitation light wavelength 1550 nm the number of excitation lines the power density on the sample can be reduced without decreasing the SAW-amplitudes.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

“…To this end various modulation techniques have been pursued. Using pulsed Q-switched lasers their pulse train can be used for modulation, thereby reducing the spectrum [1]. An alternative has been developed by Murray, Balogun and Bramhavar to excite and measure surface acoustic waves up to the GHz frequency range by amplifying the output of a harmonically modulated laser diode with a fiber amplifier [2], [3], [4].…”

Section: Introductionmentioning

confidence: 99%

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Direct measurement of SAW dispersion relations in the k-ω domains; numerical and experimental studies

Veres

Grünsteidl

Roither

et al. 2013

2013 IEEE International Ultrasonics Symposium (IUS)

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We evaluate the dispersion relation of surface acoustic waves by temporally and spatially modulated laserultrasound in the presented work. Experimental data are acquired by the combined application of intensity modulated laserdiodes and a spatial light modulator. Numerical simulations obtained from the solution of the coupled heat and wave equations using the finite difference time domain method with a combination of implicit and explicit temporal integration techniques.

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Section: Experimental Setup and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Direct measurement of SAW dispersion relations in the k-ω domains; numerical and experimental studies

Veres

Grünsteidl

Roither

et al. 2013

2013 IEEE International Ultrasonics Symposium (IUS)

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“…From this empirical dispersion, we calculated the theoretical amplitudes for the applied excitation patterns using Eq. (2). The results are shown in Fig.…”

Section: -2mentioning

confidence: 91%

Spatial and temporal frequency domain laser-ultrasound applied in the direct measurement of dispersion relations of surface acoustic waves

et al. 2013

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“…Techniques for generating acoustic waves with controllable, periodic sequences of laser pulses have been demonstrated. [9][10][11][12][13][14][15] An alternate approach to temporal modulation has been developed that uses an amplitude modulated continuous wave a͒ Electronic mail: twmurray@bu.edu laser source. [16][17][18] In this approach, the laser is modulated with a pseudorandom sequence and the resulting acoustic signals, in the low megahertz frequency range, are measured with an optical interferometer or piezoelectric transducer.…”

Section: Introductionmentioning

confidence: 99%

A frequency domain laser based ultrasonic system for time resolved measurement of broadband acoustic transients

Balogun

Murray

2006

Journal of Applied Physics

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A high-sensitivity frequency domain laser based ultrasonic system is presented which uses a low power, amplitude modulated continuous wave (cw) laser source for acoustic wave generation. The acoustic signals are detected using a path stabilized Michelson interferometer coupled to a rf lock-in amplifier. The modulation frequency of the generation laser is scanned over the bandwidth of interest, and transient acoustic signals are reconstructed from the frequency domain data. The effects of measurement frequency resolution, bandwidth, and time domain aliasing on the reconstructed transient response are discussed. Experimental results on thin plates, where diffuse acoustic wave fields lasting several hundred microseconds are seen as a result of multiple reflections off of sample boundaries, demonstrate that the time domain signal can be unambiguously reconstructed through appropriate selection of frequency resolution. Time domain reconstructions of acoustic signals over a bandwidth of 200MHz demonstrate the utility of the approach for acoustic microscopy; individual acoustic transients can be detected with extremely high signal to noise ratio and time gated for analysis.

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Narrowband generation of ultrafast acoustic and thermal transients in thin films for enhanced detectability

Cited by 6 publications

References 23 publications

Direct measurement of SAW dispersion relations in the k-ω domains; numerical and experimental studies

Direct measurement of SAW dispersion relations in the k-ω domains; numerical and experimental studies

Spatial and temporal frequency domain laser-ultrasound applied in the direct measurement of dispersion relations of surface acoustic waves

A frequency domain laser based ultrasonic system for time resolved measurement of broadband acoustic transients

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