Comparison of spread spectrum and pulse signal excitation for split spectrum techniques composite imaging

Svilainis, Linas; Kitov, S.; Rodríguez-Martínez, Alberto; Vergara, Luis; Dumbrava, V.; Chaziachmetovas, Andrius

doi:10.1088/1757-899x/42/1/012007

Cited by 8 publications

(4 citation statements)

References 6 publications

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“…It would also be interesting to calculate the dependence of the parameters with the frequency, as it will provide interesting information about the material mechanical behaviour. According to preliminary analysis, it will be necessary to use spread spectrum signals in order to increase the bandwidth and the energy of the pulses [12].…”

Section: Discussionmentioning

confidence: 99%

Ultrasound-Based Density Estimation of Composites Using Water-Air Interface

Aleksandrovas¹,

Rodríguez²,

Svilainis³

et al. 2016

ElAEE

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In this paper we present a new method to obtain the density of solid composites using ultrasound. The method exploits the relation between density and acoustic impedance and only requires the measurement of a reference signal form the interface water-air. Once made in a controlled environment, it can be used for any material, and does not require any additional measurement or setup , so that with a simple calculus it can be used with automatic ultrasonic measurements to calculate the density and therefore elastic constants of the composite for its complete characterization. The method is applied to 3 different materials: two composites based on epoxy and polyester resins respectively with unknown final properties and a common methacrylate sample used as reference. Results show good concordance between obtained and expected results.

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Section: Discussionmentioning

confidence: 99%

Ultrasound-Based Density Estimation of Composites Using Water-Air Interface

Aleksandrovas¹,

Rodríguez²,

Svilainis³

et al. 2016

ElAEE

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“…Conventional pulse or toneburst signals offer either wide bandwidth or energy correspondingly, but not at the same time. Application of the spread spectrum signals [19] allows getting both. This comes at the expense of the increased of the correlation sidelobes (Fig.…”

Section: Signal Acquisition Considerationsmentioning

confidence: 99%

Review of Ultrasonic Signal Acquisition and Processing Techniques for Mechatronics and Material Engineering

Svilainis

2016

SSP

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Review of ultrasound applications in mechanical and material engineering is presented. Application examples in material thickness, profile measurement are given. Applications for load, stress, stiffness, porosity, density, viscosity, bond strength, hardening depth evaluation are discussed. Composite or polymer curing states can be monitored. Ultrasonic signal propagation velocity, attenuation or nonlinearity can be used for aforementioned parameters extraction. Signal acquisition setup configurations along with signal processing techniques are discussed. Ultrasound can be used for structure integrity testing or monitoring. Imaging of the inner material structure or properties distribution requires special reconstruction techniques. Presence of the structural noise is masking the defects. Image reconstruction and structural noise reduction techniques are outlined.

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“…• They achieve a considerable improvement in the SNR by increasing the duration of the excitation signal, without negatively affecting (reducing) the signal bandwidth [33].…”

Section: Introductionmentioning

confidence: 99%

On the Optimization of Spread Spectrum Chirps Into Arbitrary Position and Width Pulse Signals. Application to Ultrasonic Sensors and Systems

et al. 2022

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This work presents in detail a new method for the optimization of rectangular spread spectrum excitation signals for its use in simple and low-cost ultrasonic pulsers, but that could be extended to other applications based on spread spectrum signals. Starting from rectangular linear frequency modulated (RLFM) chirps, it uses the transfer function of the transmitted signal and received echoes from reference specimens to iterate through a recursive algorithm to obtain arbitrary position and width pulse (APWP) signals with the desired bandwidth, maximizing the energy and the flatness of the spectrum, and enhancing the resolution and dynamic range of conventional chirp excitation signals. This optimization procedure can be repeated for any transducer and material, so that it achieves the best performance in each experimental environment. Such characteristics are ideal for Time-of-Flight estimation, imaging, and applications in which spectral regularity is needed, such as the Split Spectrum Processing (SSP) algorithm, which is used as example to test the performance of the proposed excitation signals. It also allows to specify and change the bandwidth reducing the need to change the transducers. The method is tested with different transducers (2 and 5 MHz focused transducers) and complex composite materials (aluminum-carbon aviation composite and high porosity GFRP composite) in immersion setup for imaging applications using SSP algorithm.INDEX TERMS Ultrasound, Spread Spectrum, chirp, arbitrary position and width pulses, Split Spectrum Processing, non destructive testing.

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Comparison of spread spectrum and pulse signal excitation for split spectrum techniques composite imaging

Cited by 8 publications

References 6 publications

Ultrasound-Based Density Estimation of Composites Using Water-Air Interface

Ultrasound-Based Density Estimation of Composites Using Water-Air Interface

Review of Ultrasonic Signal Acquisition and Processing Techniques for Mechatronics and Material Engineering

On the Optimization of Spread Spectrum Chirps Into Arbitrary Position and Width Pulse Signals. Application to Ultrasonic Sensors and Systems

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