Quantitative reconstruction of ultrasound fields in optically transparent isotropic solids

Chen, Lizhuo; Rupitsch, Stefan J.; Grabinger, Jens; Lerch, Reinhard

doi:10.1109/tuffc.2014.2956

Cited by 7 publications

(2 citation statements)

References 15 publications

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“…The smallest measurable phase deviation for this signal can be adjusted by our method to instead of limited by digital noise. Today, HI finds applications in various analytical fields for example, use of HI to characterize acoustic waves in water and in air by monitoring changes in the refractive index of water 47 , the use of refractive tomography to visualize acoustic field tomography in 3-dimensional gas and liquid volumes 48 and the use of HI microscopy for high precision surface measurement 49 .…”

Section: Discussionmentioning

confidence: 99%

Improved demodulated phase signal resolution for carrier signals with small modulation index by clipping and synchronous sampling for heterodyne interferometers

Meng

Schewe

Bauer

et al. 2023

Sci Rep

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Digitization of phase-modulated carrier signals with a commercially available analog-to-digital converter (ADC) is a common task in many communication and sensor applications. ADCs deliver phase-modulated digital carrier signals, which are numerically demodulated in order to extract the relevant information. However, the limited dynamic ranges of available ADCs limit the carrier-to-noise ratio of carrier signals after digitization. Correspondingly, the resolution of the demodulated digital signal is degraded. We demonstrate a sampling method with a simple demodulation scheme for phase-modulated signals with a small modulation index. Our new scheme overcomes the limitation due to digital noise defined by the ADC. Through simulations and experiments, we provide evidence that our method can improve the resolution of the demodulated digital signal significantly, when the carrier-to-noise ratio of phase-modulated signals is limited by digital noise. We employ our sampling and demodulation scheme to solve the problem of a possible degradation of measurement resolution after digital demodulation in heterodyne interferometers measuring small vibration amplitudes.

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Section: Discussionmentioning

confidence: 99%

Improved demodulated phase signal resolution for carrier signals with small modulation index by clipping and synchronous sampling for heterodyne interferometers

Meng

Schewe

Bauer

et al. 2023

Sci Rep

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show abstract

“…Also, the wavefield in the measured light path should be uniform [21]. In 2014, Chen et al used light refractive tomography to measure the strain field of a transparent medium in water, then reconstructed the wavefield and studied the wavefield with damage [24]. In 2020, Zuo et al solved the problem that Laser Doppler Velocimetry cannot directly measure the tangential stress of transverse and longitudinal waves, then measured shear waves and calculated the twodimensional dynamic stress field of the transparent medium [25].…”

Section: Introductionmentioning

confidence: 99%

Measurement of wave structures of non-dispersive guided waves in opaque media

Zhang¹,

Li²,

Gao³

et al. 2021

Meas. Sci. Technol.

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The wave structure is the theoretical displacement and energy distribution of a specific guided wave mode on cross-sections of a medium. It would be of significant meaning in selecting guided wave modes and exciting a single mode guided wave if the wave structures can be measured directly, but hard to accomplish in opaque media due to its physical constraints. This paper proposes a method to measure the wave structure of non-dispersive guided waves by changing the excitation position and frequency. This method avoids directly measuring the displacement of the cross-section and only needs to receive signals at one position on the surface. The feasibility of such a method is proved by applying the reciprocity theorem. Then, a detailed scheme for measuring wave structure of non-dispersive guided waves is given. According to this scheme, the wave structure of the Rayleigh wave in aluminum is measured. Experimental results show agreement with the theoretical expectations. The measurement method is verified. This work could be a guide to practical guided wave applications in the future.

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Characterization of Sound Fields Generated by Ultrasonic Transducers

Rupitsch

2018

Piezoelectric Sensors and Actuators

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Quantitative reconstruction of ultrasound fields in optically transparent isotropic solids

Cited by 7 publications

References 15 publications

Improved demodulated phase signal resolution for carrier signals with small modulation index by clipping and synchronous sampling for heterodyne interferometers

Improved demodulated phase signal resolution for carrier signals with small modulation index by clipping and synchronous sampling for heterodyne interferometers

Measurement of wave structures of non-dispersive guided waves in opaque media

Characterization of Sound Fields Generated by Ultrasonic Transducers

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