Ultrasound Transmission Spectral Compensation Using Arbitrary Position and Width Pulse Sets

Svilainis, Linas; Rodríguez-Martínez, Alberto; Chaziachmetovas, Andrius; Aleksandrovas, Arturas

doi:10.1109/tim.2018.2809838

Cited by 9 publications

(13 citation statements)

References 23 publications

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“…The signal spectrum can be designed to match the required bandwidth, so that all of the energy is used to produce useful frequencies. Furthermore, the spectral content of the ultrasonic signal can be programed [73]. APWP sequences can be considered as a binary analog of an arbitrary waveform.…”

Section: B Apwp Sequence Parametersmentioning

confidence: 99%

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Compact Laser Driver for Ultrasonic Arbitrary Position and Width Pulse Sequences Generation

Svilainis

Chaziachmetovas

Eidukynas

et al. 2021

IEEE Trans. Instrum. Meas.

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Laser ultrasound offers several benefits in comparison to immersion or air coupled ultrasound: it directly generates stress on the sample surface; it has a wide bandwidth and a small acoustic source can be produced. Conventionally, high power pulsed lasers are required therefore equipment is bulky and expensive. Here we propose to use mid-power laser diodes, which are small and low cost. To solve the low signal amplitude problem with lower power lasers, the use of spread spectrum signal, arbitrary position and width binary pulse sets is proposed. To date, a laser driver for this task has not been available. This paper describes the development of such a compact driver, where the essential electronics occupy an area of 10x20 mm. The whole system with a fixture for kinematic mount is comparable in size to a conventional piezoelectric ultrasonic transducer. The driver can supply pulse sets of up to 40 A. Individual pulse duration can vary between 20 ns to 1000 ns (0.5-25 MHz ultrasound range) and the total pulse train duration is limited by the laser type used. Experiments show that up to 10 s long pulse sets can be used at 10 A current, without laser degradation. Current waveforms, beam profile and optical response signals were measured for three rectified topologies. It was concluded, that the GaN based constant current switch topology has the best performance, but a power MOSFET in a source current feedback topology can also be used to generate pulses down to 20 ns. Photoacoustic response signals from chirp and phase shift keying modulation have been demonstrated.

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Section: B Apwp Sequence Parametersmentioning

confidence: 99%

“…The beam shape control was limited to a simple optics, aiming for simplicity and small size. The experimental investigation of the ultrasound generation on an acoustic delay line is presented, demonstrating that the spectral content of the ultrasonic signal can be controlled using the APWP sequences, described in [69] and [73].…”

Section: Introductionmentioning

confidence: 99%

Compact Laser Driver for Ultrasonic Arbitrary Position and Width Pulse Sequences Generation

Svilainis

Chaziachmetovas

Eidukynas

et al. 2021

IEEE Trans. Instrum. Meas.

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“…I-V technique uses current shunt reference resistance which is preferably connected to ground. High side current sensor can be used for I-V or RF I-V measurement setup [27]. But both I-V and ABB require two measurement channels which are usually not available on ultrasonic data acquisition system.…”

Section: A Impedance Measurement Techniquesmentioning

confidence: 99%

“…Single pulse was chosen because it is most popular in ultrasonic NDT systems. Quasichirp is a spread spectrum signal type that is becoming popular both in ultrasonic imaging [27] and impedance measurement. It offers both wide bandwidth and good SNR in measurements at the expense of relatively simple excitation electronics (no linear amplifiers is required).…”

Section: Output Impedance Measurement Systemmentioning

confidence: 99%

Ultrasonic Air Coupled Transducer Output Impedance Measurement Technique

Svilainis¹,

Chaziachmetovas²,

Álvarez-Arenas³

2019

ElAEE

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Estimation of the output impedance of ultrasonic transducers is required for electrical matching circuits design and for receiving amplifiers noise optimization. This paper presents a simple technique for transducer output impedance estimation using the same data acquisition system and signals that are conventionally used in non-destructive testing. A pair of ultrasonic transducers is used: one for transmission, one for reception. Received signal is recorded under low and high resistance load and transducer output impedance is then obtained from these two signals. Hence, this technique requires only one measurement channel and bias errors are low (no need for calibration). In addition, it is ground referenced and does not require the transducer to be removed from the positioning fixture. Experimental results obtained using different probing signals have been compared against conventional measurements obtained by an impedance analyser.

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“…As the acoustic wave propagating through the interface of inclusions with different acoustic impedance and geometrical size, several phenomena like attenuation, reflection and scattering may occur, based on which three major modalities are categorized: transmission (Svilainis et al, 2018), reflection (Chen et al, 1991) and scattering (Gunarathnee and Chiristidis, 2001). The effect of acoustic scattering only occurs obviously when the size of scatters is similar to the wave length, which is not a common scenario in the application of multiphase flow.…”

Section: Introductionmentioning

confidence: 99%

Continuous-wave ultrasonic tomography for oil/water two-phase flow imaging using regularized weighted least square framework

Líu

Tan

2019

Transactions of the Institute of Measurement and Control

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Two-phase flow is a regime that commonly existed in many applications of process industry, on which the technique of ultrasonic tomography (UT) could provide reliable measurement with benefits of non-invasion, non-radiation and low-cost. In order to provide considerable visualization of low acoustic impedance contrast configurations in two-phase flow, a regular weighted simultaneous algebraic reconstruction technique (RW-SART) using continuous-wave excitation is proposed and presented in detail. With measurement strategy and formulized reconstruction model introduced, the measurement system is introduced with modification on continuous-wave excitation module and fan-beam angle transducers. A regularized weighted least square (RWLS) framework combining total variation (TV) regularization and SART reconstruction is derived and presented in detail to address the problem that under-determined and ill-conditioned situation couldn’t be resolved simultaneously. Both numerical simulation and experimental investigation are conducted to validate the feasibility of continuous-wave excitation and the improvement of proposed reconstruction strategy, from which the distribution of oil-water two-phase flow is effectively reconstructed. The implementation of measurement system provides an option of continuous high-voltage excitation and measurement in UT. By utilizing both the geometric information and penalty constraint, the proposed reconstruction approach provides a framework that introduces regularization information to the algebraic iteration reconstruction. Consequently, it has better reconstruction result than TV, Landweber, L1, filtered back projection (FBP) and SART method.

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Ultrasound Transmission Spectral Compensation Using Arbitrary Position and Width Pulse Sets

Cited by 9 publications

References 23 publications

Compact Laser Driver for Ultrasonic Arbitrary Position and Width Pulse Sequences Generation

Compact Laser Driver for Ultrasonic Arbitrary Position and Width Pulse Sequences Generation

Ultrasonic Air Coupled Transducer Output Impedance Measurement Technique

Continuous-wave ultrasonic tomography for oil/water two-phase flow imaging using regularized weighted least square framework

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