Development of a mechanical strain sensor based on time reversal of ultrasonic guided waves

Kubrusly, Alan C.; Weid, J. P. von der; Braga, Arthur M. B.; Pérez, Nicolás; Adamowski, Júlio C.; Oliveira, Timóteo Francisco de

doi:10.1109/i2mtc.2014.6860758

Cited by 2 publications

(3 citation statements)

References 13 publications

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“…Experiments with higher TREF presented higher amplitude sensitivity as pointed in [9]. Comparing these results with the original experiments using commercial monoelement transducer [4], higher amplitude sensitivity has been achieved, up to about 3.75 times.…”

Section: Resultssupporting

confidence: 64%

“…(10) In this case, an expression that relates the dependence on the time reversal signal with the relative phase differences, introduced by the strain, is not available, as in (9). However, the focalization properties showed to be quite similar to those of the traditional time reversal [6].…”

Section: Strain Monitoring By Time Reversalmentioning

confidence: 99%

“…It has been shown that the amplitude sensitivity is more intense for systems in which the time reversal produces a more concentrated focus [9]. To evaluate the time reversal efficiency to concentrate the energy at the focus, a figure of merit named Time Reversal Energy Efficiency (TREF) is used.…”

Section: Strain Monitoring By Time Reversalmentioning

confidence: 99%

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Application of one-bit time reversal technique to mechanical strain monitoring in plates

Kubrusly

Braga

Weid

et al. 2014

2014 IEEE International Ultrasonics Symposium

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Abstract-This paper presents the application of the one-bit time reversal technique to a longitudinal strain sensor. The setup consists of a pair of piezoelectric transducers bonded in the extremities of a strip of aluminum plate. When the plate is subjected to traction, time reversal focalization is performed, the mismatch between the impulse response at initial and strained levels causes loss in the focusing quality. The strain can be evaluated by measuring either the time of flight shift or the amplitude decrease in the focused signal. One-bit time reversal can simplify the electronic device to perform the proposed technique. In this work, the results using one-bit and normal time reversal implementation were compared. Experiments were performed using three different 2-2 piezocomposite transducers pairs at 500, 1000 and 2250 kHz. The longitudinal strain was applied up to 150 �-strain using a strain gauge as a reference.The time reversal energy efficiency was used as a spectrum figure of merit and obeys the sensitivity behavior. The one-bit time reversal variation provided good focused signal for all experiments and no significant loss in focus quality. Moreover, every configuration showed a higher sensitivity than its normal time reversal version, at least 10% depending on the transducer.The one-bit technique reveals an important enhancement for the method; it holds the natural advantage of being simpler and the benefit of higher sensitivity.

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Section: Resultssupporting

confidence: 64%

Section: Strain Monitoring By Time Reversalmentioning

confidence: 99%

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Application of one-bit time reversal technique to mechanical strain monitoring in plates

Kubrusly

Braga

Weid

et al. 2014

2014 IEEE International Ultrasonics Symposium

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Mechanical Strain Sensing by Broadband Time Reversal in Plates

Kubrusly

Pérez

Oliveira

et al. 2016

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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In a previous work, the ultrasonic measurement of longitudinal strain in a plate using the Time Reversal technique was proved. One drawback of this measurement is the low sensitivity of the signal against changes in strain. This problem can be solved using the inverse filter signal processing. This technique increases sensitivity but also reduces the energy of the signal and, consequently, the signal to noise ratio. Thus, a physical solution is presented in order to improve the sensitivity of the system. Additionally, the one-bit time reversal is introduced in order to simplify the hardware used in this technique. The strain sensing system is composed of a pair of piezocomposite transducers bonded to the surface of the tested plate and used to generate and sense the ultrasonic waves guided through the specimen. The use of time reversal provides phase compensation for dispersion and edge reflections in the propagation of the guided waves in the plate, allowing time recompression of the waves. The measurement principle is based on the detection of changes in the amplitude and time-of-flight of the focused signal when the plate is subjected to longitudinal strains. System sensitivity is improved by using 2-2 piezocomposite transducers designed to operate between 0.2 to 3.0 MHz. In the signal processing, the one-bit time reversal is compared with the conventional time reversal in twelve-bit resolution. A figure of merit is introduced in order to evaluate the influence of the transfer function on strain sensitivity. This figure of merit relates the energy concentrated at the time reversal focus with the total energy of the signal. This value represents the ability of the time reversal process to recompress the signal at the focus. Experiments were conducted by applying strains up to 150 μm/m. Results show a linear response in the change of the focus amplitude. The sensitivity depends on the transducers and it can be related to the proposed figure of merit. The focus quality is kept when one-bit time reversal is used, showing to be also feasible for the measuring technique. All the results agreed with the numerical time-reversal implementation.

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Development of a mechanical strain sensor based on time reversal of ultrasonic guided waves

Cited by 2 publications

References 13 publications

Application of one-bit time reversal technique to mechanical strain monitoring in plates

Application of one-bit time reversal technique to mechanical strain monitoring in plates

Mechanical Strain Sensing by Broadband Time Reversal in Plates

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